120056 an 01 en Signalgenerator WG 820

Systems

Type Sampling Frequency /Amplitude Resolution

Order Number

WG810 10MHz / 8bit 120055

WG820 20MHz / 8bit 120056

WG1220 20MHz / 12bit 120058

WG1240 40MHz / 12bit 120059

WG1440 40MHz / 14bit MR144

WG1475 75MHz / 14bit MR147

Instruction Manual Edition: January 2000

ArbitraryWaveform Generator

WGxx Arbitrary Waveform Generator Contents

2

Manufacturer:

Mair & Rohner OEGRennbahnweg 55A-1220 VIENNA / Austriaphone: ++43 1 2026400fax: ++43 1 2026400 18

Internet:email: [email protected]: http://www.mrsys.at

WGxx Arbitrary Waveform Generator Contents

3

Contents

Supplied Items ............................................................................... 4

Options .......................................................................................... 4

Key Specifications ......................................................................... 4

First Steps ..................................................................................... 5

Inputs and Outputs of the AWG .............................................. 5Connection of the Arbitrary Waveform Generator to a PC ..... 6Safety Hints ............................................................................ 6

Front Panel Operation ................................................................... 8

Frequency ............................................................................... 8Amplitude ............................................................................... 9Offset ...................................................................................... 9Output Attenuator ................................................................... 10Selectable Low-Pass Filter .................................................... 10Menu ...................................................................................... 11

Morphing ......................................................................... 11Waveform ........................................................................ 11Modulation ....................................................................... 11Symmetry (Duty-Cycle) .................................................... 12Position of Sync-Signal .................................................... 12Mode of Sync-Signal ....................................................... 13Trigger Mode ................................................................... 13Clock Source ................................................................... 14Special Functions ............................................................ 15Measurement of External Frequency .............................. 15Sweep Mode ................................................................... 15

Special Button Modes ............................................................ 16Setup ............................................................................... 16

Menu Structure ............................................................................. 17

Calibration of the Instrument ......................................................... 18Calibration Menu .................................................................... 18Calibration Menu – Overview ................................................. 21

Software SPro (optional) ............................................................... 22System Requirements ............................................................ 22Software Installation ............................................................... 22User Interface – Overview ...................................................... 22

Instrument Specifications .............................................................. 24

WGxx Arbitrary Waveform Generator

4

Supplied Items• Arbitrary waveform generator (AWG)

• Power cord (wall-mount AC power supply 12V AC for WG810 and WG820)

• Instruction manual (this booklet)

Options• Software SPro with serial link cable (PC to AWG,9-way, female-female,

crossed pairs)

Key Specifications

• Generation of arbitrary wave shapes with maximum clock frequency of10MHz up to 75MHz (model dependent).

• 7 arbitrary wave shapes can be loaded, each up to 32768 data points;wave shapes remain permanent if unit is turned off.

• Additional analog mode (sinusoidal, triangular, pulse/square)

• Morphing (continuous fading between two different signals)

• 3 independent parameter storage sets (frequency, amplitude, offset, duty-cycle, sync-position).

• Frequency measurement of external signal up to 10MHz.

• Operating modes:- periodic- single shot (single cycle)- single step- morphing (continuous fading between two different signals)- external trigger mode- AM/FM modulation mode- sweep mode- frequency measurement mode

• Sweep mode (arbitrary signals only): linearlogarithmicexponential

• Outputs: 50 Ω - analog output,sync output (TTL)

• Inputs: external clock input,AM/FM input (trigger-input for single-cycle mode)

• Can be connected to any PC with serial interface (i.e., unrestrictedoperation also in connection with notebook computers).Interface isolated from signal ground!

• Optional available programming and operating software SPro with powerfulintuitive user interface running under MS-Windows. Allows CAD-likegeneration of arbitrary waveshapes (drawing objects: line, free-hand curve,mathematic functions etc.).

WGxx Arbitrary Waveform Generator First Steps

5

First Steps

This section describes the first turn-on of the arbitrary waveform generator(AWG), the connection to a PC, gives important operation and safety hints aswell as a brief survey of the various features of the AWG.

Please read instructions carefully to avoid operating failures!

CAUTION: To prevent damage to the instrument, check for proper match ofline and instrument / power supply voltage and proper fuse type.

Inputs and Outputs of the AWG

On the front panel there are located the 50Ω-analog output (OUTPUT), thesync output SYNC OUT, the frequency input FREQ IN to connect an externalclock signal and the AM/FM- modulation/trigger input.

analog (signal) output (OUTPUT):

amplitude: 0....20Vpp(WG8xx: 0...14Vpp)

offset: -10V....10V(WG8xx: -7V...7V)

external frequency input (FREQ IN):

42V maximum, for external clock signalor as frequency measurement input.

sync output (SYNC OUT ):

TTL signal level,rising edge / falling edge,positive pulse / negative pulse,for arbitrary mode: adjustable position(allows triggering on a specific point ofprogrammed waveform)

modulation input (AM/FM ): +/-10V maximum, for amplitude orfrequency modulation of the outputsignal, trigger input

The rear panel shows the serial interface connector (PC interface).A standard 9-way link cable (female-female, crossed pairs) is required forAWG-to-PC connection.


6

Connection of the Arbitrary Waveform Generator to a PC

The AWG can be connected to the serial interface (COM1 to COM4) of anypersonal computer by application of the link cable included to the optionalsoftware package SPro. This software allows the complete remote operation ofthe AWG as well as the CAD-like design of arbitrary waveforms which cansubsequently be loaded permanently into the AWG.

Serial interface (RS232): Only three wires (RxD, TxD and Gnd) are used,connected as following (RxD, TxD crossed):

Gnd

TxD

RxD2

3

5

2

3

5 9pol.9pol.

PC AWG

TxD

RxD

The serial interface of the AWG is isolated from the AWG signal ground!

Safety HintsThe application of the AWG as agreed by the manufacturer covers the itemsgiven in the section "Key Specifications". Application of the AWG beyondthese specifications (especially in connection with hazardous environmentalconditions) are not permitted.

Hazardous environmental conditions are:

- operation in moisture or outdoor areas

- dust, inflammable or aggressive atmosphere, vapors and solvents

- significant mechanical vibrations

- strong electro-magnetic field, e.g., close to electrical drives ortransformers etc.

- static electricity (strong electric fields and especially discharges)

Caution

• The instruments WG1220, WG1240, WG1440 and WG1475 aredesigned according to safety class I (third wire protective earth ground).Before connecting to the facility power outlet, examine extension cordsetc. between the instrument and the facility power outlet for a continuousearth ground path.

It is not permitted to operate the instrument without protective earthground connection!


7

• In case of replacement of fuses it has to be guaranteed that the replace-ment components show the specified current/voltage rates and thespecified interruption characteristic (standard/fast/slow).Any bypassing of fuses (shortage) is strictly not allowed!

• To avoid the risk of injury by electric current it has to be guaranteed thatany opening of the instrument in case of repair has to be performed withdisconnected power cord exclusively by qualified service personnel.

• In case of the possibility of a broken protective earth ground connectionthe instrument immediately has to be taken out of operation; furthermore,it has to be guaranteed that a inadvertent re-operation is avoided. Thisalso is true for the case that the instrument shows mechanical damagesor in case that the display remains inactive if the instrument is turned on.

• Capacitors inside the instrument can show dangerous voltages even ifthe instrument is disconnected from the facility power outlet!

• The instruments WG810 and WG820 are operated with a wall-outletpower supply unit. The arbitrary waveform generator shows a nominalinput voltage of 12V AC (safety class II). The instrument has to beoperated exclusively by application of the included power supply device.The cabinet of WG810 and WG820 (which are supplied by a wall-outletpower supply) is not connected to the protective earth ground.

Isolated Signal OutputThe instruments feature isolated signal output which is of advantage for manyapplications which require testing signals not referenced to protective earth inorder to avoid ground loops or to minimize common mode noise.

The BNC-output terminals of the WGxxx instrument family are not connectedto the protective earth ground (case). However, the voltage between signalground (BNC terminals) and protective earth ground must not exceed 42V:

max. voltage between BNC terminals and protective earth ground: 42V

WGxx Arbitrary Waveform Generator Front Panel Operation

8

Front Panel Operation

Waveform-Generator

42V

OUTPUTAM / FM

50 OHM+-10V max

SYNC OUT

50 OHM

button 1 button 2 button 3

The instrument is designed to be operated easily and comfortable using thefront panel elements (push-buttons, rotary knob, liquid crystal display). Allbasic operation modes and features are accessible via specific push-buttons.The enhanced instrument modes and parameters are accessible via LCDmenu operation. Instrument options are also grouped to a (second) menu.

FrequencyIf the Frequency push-button is single-pressed, the first line of the LCD showsthe actual frequency. The second LCD line indicates either the mode line(Fig.1) or the storage line (Fig.2). Display of mode line or storage line can betoggled using the Frequency button.

f = 1 , 2 3 4 k H z/ 1 0 m o d e * 1 0

Fig.1: Display of frequency (mode line)

The frequency can be changed within the whole range using the rotary knob. Ifthe mode line is displayed the frequency can be increased or decreased by afactor of 10 using buttons 1 or 3. The button 2 (mode) allows the change of thedisplay mode; there, ‘frequency’, ‘period’ or ‘sampling frequency’ (only forarbitrary waveforms) are available.

f = 1 , 2 3 4 k H z1 k 2 5 1 0 k 0 5 0 k 0

Fig.2: Display of frequency (memory line)

If the memory line is displayed by the LCD, the actual frequency can be set tothe indicated value by a short push to the corresponding button 1 to 3(the instrument features three non-volatile memory cells for frequency values).


9

The actual frequency value can be saved to a memory cell using a long pushto buttons 1 to 3 . The corresponding button has to be pushed until along beep appears. (The storage of frequency values is also possible if theLCD line 2 displays the mode line!)

The stored value will be displayed in a shortened way. If, e.g., the value1.234kHz has been stored, the display indicates 1k23. Nevertheless, thestorage cell contains the exact value of 1.234kHz.

A signal beep will appear if the upper or lower frequency limit of the instrumentis reached; in this case the frequency is set to the corresponding limit value.

AmplitudeThe peak-to-peak value of the actual signal will be displayed in the first line ofthe LCD if the Amplitude button is pressed. The second line of the LCD shows(similar to the case of frequency adjustment) three amplitude storage values(cf. Fig.1).

U a = 1 0 , 2 5 V p p1 , 2 0 5 , 0 0 1 0 , 0

Fig.3: Display of signal amplitude (peak-to-peak)

Again, the actual value can be set to a memory value by a short press tobuttons 1 to 3 ; if the buttons are pressed for a longer period theactual amplitude will be stored to the corresponding memory cell.

The amplitude value is limited to the range specified in the technical datasection. If, e.g., the signal offset value is adjusted to Voffs=2V, a output voltagerange of Va= Vmax − 2V can be achieved. A warning beep will be provided if thislimit is reached.

Remark: Due to the output impedance (internal impedance) of theinstrument (50 Ω) the voltage across the load is only 50%of the selected amplitude for a 50 Ω load impedance (i.e.,the amplitude value described above specifies theno-load output voltage)!

OffsetThe actual offset value will be displayed in the first line of the LCD by pushingthe Offset button. Similar to the frequency adjustment also here the secondline acts as mode line (Fig.4) or indicates the content of the three availablememory cells (Fig.5).

U o f f s = - 2 , 3 5 V( )

Fig.4: Display of offset (mode line)

U o f f s = - 2 , 3 5 V- 3 , 2 0 + 2 , 3

Fig.5: Display of offset (memory line)


10

The application of the offset memory cells can be performed in the same wayas has been already described for frequency adjustment. If the mode line isdisplayed one of the three operating modes ‘uni-polar positive’ ( ), ‘uni-polarnegative’ ( ) or ‘bipolar’ ( ) can be selected. For the uni-polar modesamplitude and offset are automatically limited in that way that the output signalof the instrument is either exclusively positive or negative, respectively. In caseof bipolar operation mode both output signal polarities are permitted (cf. Fig.6).

The actual polarity mode is indicated by parentheses ( ).

Vpp

Voffs

Vpp

Voffs

Vpp

Voffs0V

0V

0V

Fig.6 : Offset modes; ‘ uni-polar positive’ (top left) ‘ uni-polar negative’ (top right) ‘ bipolar’ (bottom)

Output AttenuatorIf the Output button is pressed the actual attenuation value is displayed(Fig.7); in case 'Lowpass-Filter' is indicated, the Output button has to bepressed again.

O u t p u t( 0 d B ) - 2 0 d B O F F

Fig.7: Display of output attenuation

If −20dB is selected, all indicated voltage values (amplitude, offset) areaccordingly divided by the factor 10.

Selectable Low-Pass FilterIf the Output button is pressed a second time the status of the selectable low-pass filter is indicated (Fig.8). If (ON) is selected, a low-pass with a cut-offfrequency of ≈10MHz (WG810: ≈500kHz) is inserted into the signal path(possible only for arbitrary signals).

L o w p a s s - F i l t e r( O N ) O F F

Fig.8: Low-pass filter selection


11

MenuA short-press of the Menu button allows the selection of a specific operatingmenu as given below.

A long-press (≈2 sec.) to the Menu button selects the setup menu of theinstrument (see page 13).

MorphingThis menu (Fig.9) is displayed only for Morphing wave shapes. Morphing waveshapes allow a cross-fading between two arbitrary wave shapes using 128intermediate steps. There, the calculation of the cross-fading (i.e., the 128intermediate wave shapes) is performed by the PC operating software. Oncedownloaded to the instrument, the intermediate wave shape 0...127 can eitherbe selected manual using the rotary knob (man) or by the external signal fedto the AM/FM input (ext) (operating range: [−5V...+5V] ). It has to be pointedout, that the transition between the individual wave shapes is perfectly smoothand does not show any drop-outs.

M o r p h i n g( m a n ) e x t a u t o

Fig.9: Morphing menu

WaveformHere the second line of the display can be shifted using the rotary knob (seeFig.10). Then the viewable wave shapes can be selected by pressing thebuttons 1 to 3 .

W a v e f o r MS i n T r i R e c ( A R b 1 ) A r b 2 A r b 3 ...

Fig.10: Waveform menu

The wave shapes Sinusoidal (Sin), Triangular (Tri), Square-Wave (Rec) aregenerated using analog techniques. Contrary, the (Arb1) to (Arb8) representthe memory cells for arbitrary signal mode of the instrument.

Further, also the operation mode ‘DC’ can be selected using this menu. In thisspecial “wave shape” mode a DC output voltage is generated by theinstrument (within the general amplitude limits) which can be adjusted usingthe Offset button. All parameters which are meaningless for this mode (e.g.,frequency adjustment etc.) are locked.

ModulationThis menu allows the selection of one of the two possible modulation methods(Fig.11). Either no modulation (OFF) or amplitude modulation (AM) orfrequency modulation (FM) of the output signal can be selected.

M o d u l a t i O N( O F F ) A M F M

Fig.11: Modulation menu


12

The amplitude modulation is performed according to the relation:

AM: Va,ss = VDisplay − Vmod Vmod = [−5V...+5V]

If AM mode is selected, the amplitude of the instrument is adjustedautomatically to 5Vss in order to guarantee the maximum operation range ofthe modulation voltage. However, this voltage can be modified using theamplitude adjustment.

For FM mode the output frequency of the instrument can be modified in theregion [0.5 fDisplay to fDisplay] according to:

FM: fout = fDisplay ∗ (0.75 − Vmod/5V ∗ 0.25) Vmod = [−5V...+5V]

Symmetry (Duty Cycle)This menu appears only in case of triangle and square wave mode.

D u t y C y c l e1 5 % 5 0 % 8 5 %

Fig.12: Symmetry menu

The duty cycle of the output signal can be adjusted using the rotary button.Furthermore, again three memory values are available equal as, e.g., forfrequency adjustment.

waveshape

Frequency duty cycle region Resolution

triangular 1Hz ... 400kHz 1Hz ... 200kHz (WG810)

1% ... 99% 1%

1Hz ... 399,9kHz 1% ... 99% 1%400kHz ... 1,999MHz400kHz ... 999kHz (WG810)1MHz . .. 2MHz (WG810)

5% ... 95%20% ...80%20% ...80%

5%5%10%

squarewave

2MHz ... 10MHz 25% ... 75% 25%

Position of Sync-SignalThis menu appears only in case of arbitrary waveform mode.

The position of the sync output signal can be adjusted within sample point 1and N−1 (N... number of the total sample points of the waveform) using therotary knob (Fig.13, see also section ‘Mode of Sync Signal’ below).In addition, again three memory values are available equal as, e.g., forfrequency adjustment.

S y n c P o s = 1 2 3 41 2 3 5 0 0 1 2 k 3

Fig.13: Menu sync position


13

If the SyncPos value exceeds 9999, a simplified display format (see thirdmemory cell of Fig.13) will be applied.

Mode of Sync-SignalWith this menu the behavior of the sync signal can be modified. There, themodes ‘normal’ (rising edge?), ‘inverted’ (falling edge?) and ‘pulse’ areavailable using buttons 1 to 3 . Pressing button 3 again results ina reversion of the pulse polarity.

S y n c M o d e( )

Fig.14: Menu sync modes (analog waveform generation)

If arbitrary waveform generation mode is selected, in addition the position syncsignal can be modified using the rotary knob.

S y n c P o s = 1 2 3 4( )

Fig.15: Menu sync modes (for arbitrary waveform generation)

Trigger ModeThis menu allows the selection of continuous (cont), manual (man) or external(ext) triggering of the instrument.Remark: This menu is not active for WG810 in case of sinusoidal, triangular orsquare-wave mode (i.e., analog waveform generation?).

T r I g g e r M o d e( c o n t ) m a n e x t

Fig.16: Trigger menu – channel 1 (?)

For operating mode ‘continuous’ the arbitrary wave shape is restartedautomatically if the last sampling instant of at full cycle is reached.

Using trigger mode ‘manual’ (or ‘single-shot’) the instrument generates asingle arbitrary waveform cycle if button 2 is pressed.

For mode ‘external’ a single cycle is triggered by a TTL signal fed to theAM/FM input. In this case AM/FM modulation is not possible.

cont

extman

Generator

Clk OUT

Sync

Trigger

AM/FMAM/FM bei externer Triggerungnicht möglich

Taste oderDrehrad

AM/FM/Trig In

Trigger

OUT 50Ω

Sync OUT

Fig.17: Schematic diagram of trigger sources


14

Remark: All waveform modes (with the exception of triangular mode operation)are retriggerable, i.e., a new cycle can also be started if the full cycle has notyet been finished.

In case of triangular mode operation a trigger signal appearing within the cycleis latched internally and becomes active immediately after cycle completion.

Clock SourceThis menu appears only in case of arbitrary waveform mode and specifiesthe source of the sample clock, i.e., the signal which transfers the data pointsfrom the wave shape memory to the D/A-converter of the instrument.

C l o c k S o u r c e( i n t ) s i n g l e e x t

Fig.18: Clock source menu – channel 1 (?)

For operating mode ‘int’ the internal NCO (numerically controlled oscillator)acts as clock source (see Fig.19).

In case of mode ‘single’ clock pulses can be provided by pressing button 2 or using the rotary knob.

For remote operation of the instrument by a PC additionally a software timercan be used as clock source.

If the clock source mode of the instrument is changed to ‘single’ the output ofthe data points starts at the actual address of the wave shape memory.Consequently, the output of the data points in normal (‘int’) mode can bepaused by switching into 'single' mode and continued if ‘int’ mode is selectedagain.

A long-press on button 2 ('single') resets the address counter of the waveshape memory. Afterwards the output of the wave shape starts at the curvecycle.

If mode ‘ext’ is selected, the TTL ? signal fed into the FREQ IN input acts assample clock source of the instrument.

NCO ext

singleint

Generator

Clk OUT

Sync

Trigger

AM/FM

1Hz...75MHz

Taste oderDrehrad

FreqIn Clock Source

AM/FM

OUT 50Ω

Sync OUT

Fig.19: Schematic diagram of sample clock sources


15

Special FunctionsThis menu allows the selection of one of the two special functions ‘Freq Count'(frequency measurement of an external signal) or ‘SweepMode' by pressingbutton 1 or 3 .

F r e q S w e e pC o u n t M o d e

Fig.20: Special function menu

Measurement of External FrequencyThe frequency of an external signal fed into the FREQ IN input of theinstrument can be measured in the range [0.1Hz ...10MHz]. There, theamplitude of the input signal has to be within the interval [0.2Vpp ... 50Vpp].

f = 1 2 3 , 4 k H z. T = 8 , 1 0 3 u S

Fig.21: Frequency measurement of external signal

In addition, also the period of the actual measurement value is given.

Sweep ModeThis function is only available for arbitrary waveform generation.

The first line of the display indicates the sweep time (resolution 100ms). Withinthis time interval the individual frequency values are updated by a 20ms clock(i.e., for 0.1s sweep time five different discreet frequencies between start andstop frequency are generated).

S w e e p : t = 5 , 3 s1 0 k 0 2 0 k 0 l o g

Fig.22: Sweep mode

The left value displayed in the second LCD line gives the starting frequency,the value displayed in the center of the LCD gives the stop frequency of thesweep cycle. By pressing button 1 (or 2 , respectively) one of the threememory cells of the frequency memory can be selected to define the startfrequency (or the stop frequency, respectively) of the sweep cycle. It should benoted that also a sweep cycle with decreasing frequency ramp can be realizedif start frequency > stop frequency has been chosen.

To change the three memory values for start and stop frequency it is requiredto overwrite the memory cells of the frequency adjustment (see sectionFrequency).

With button 3 the sweep-type can be modified.Here the modes linear, logarithmic or exponential are available.


16

Special Button Modes

Termination of 'Remote' OperationIn case of connection loss to the PC while the instrument is in remote modeoperation (operation via front panel is not possible in this mode), the remoteoperation can be cancelled by pressing buttons 1 and OUTPUT simultaneously.

Recall of Default Values & Reset

If the three buttons MENU , AMPLITUDE and FREQUENCY are pressedsimultaneously all default values of the instrument (memory cells, actualvalues etc. – but not the calibration values!) are restored.Additionally, a new initialization cycle will be performed.

SetupThe Setup menu will be activated by a “long press” (≈2 sec.) to theMenu button.

S E T U PC a l i b r t e S o u n d

Fig.23: Setup menu

CalibrationSee section "Calibration of the Instrument", page 18.

Sound EffectsThe following sound effects are implemented to the instrument:Short beep, “clicking” of rotary knob, long beep (if a value is written to amemory cell), long deep beep (if a parameter limit is reached).

These signals should make the operation of the instrument more comfortable.However, in some cases these signals also may bother the operator,especially if the instrument is used intensively. Consequently, the soundeffects can be turned-off (exception: button clicking).

S o u n d E f f e c t s( O N ) O F F

Fig.24: Sound menu


17

Menu Structure

For the sake of clarity the menu structure of the instrument is given:

Special Functions

Morphing

Modulation

DutyCycle SyncPosition

SyncMode

Trigger

Menu

Menu

Mor_

Menu

Menu

Menu

Tri,Rec Arb1 ... Arb7

Selection ofMorphing - Trace

Arb1..Arb7Sin,Tri,Rec

ClockSource

Menu

Sin

Waveform

Menu

MenuArb1..Arb7Sin,Tri,Rec

Menu

Sinusoidal, Triangle,Square-Wave for WG810

Fig.25: Menu structure of the instrument – channel 1 (?)


18

S E T U P

Calibration Sound On/Off

1 3

Menu long pressSETUP Menu

Fig.26: Setup menu

Calibration of the InstrumentThe instrument has been carefully calibrated prior to shipping. However,several circumstances (aging, temperature variations etc.) may causedifferences of the parameters to their reference values.

In order to compensate these effects the instrument may be calibrated by theuser. Furthermore, this feature also allows the calibration of the instrument toexternal reference sources.

Calibration Menu

The Setup menu (which can be activated by a “long press” of button MENU )gives access to the Calibration menu (item 'Calibrate'):

L o a d D e f a u l t s ?Y E S E X I T N O

Fig.27: Entry to the calibration menu

Prior to the calibration process the instrument asks if the default calibrationvalues shall be used.

‘YES’: The calibration values for shipping state of the instrument are used (all values of a former user calibration will be lost!)‘NO’: The actual calibration values are used (essential for partial calibration)


19

C a l i b r a t i o nO f f s A m p E X I T

Fig.28: Calibration menu

Offs => Calibration of offset values

Amp => Calibration of amplitude values

C a l i b r a t e O f f s e t C a l i b . A m p l i t u d em i n m a x f r e e m i n m a x f r e e

Fig.29: Calibration menu for offset values and for amplitude values

Using this sub menu the calibration setup points ‘min’, ‘max’ and ‘free’ can beselected. With items ‘min’ / ‘max’ the minimal / maximal adjustable offset andamplitude value can be calibrated.

The following procedure is recommended:- connect a voltage meter to the output connector OUTPUT of the instrument- select the operating point to be calibrated ('min' or 'max' for offset or

amplitude calibration menu)- adjust the value of the voltage meter to the exact value displayed by the

instrument (e.g., +5V for calibration of the max. offset) using the rotaryknob

- press button 2 (ENTER)

Now the new calibration value gets permanent.Use the same procedure for calibration of min. offset and for max. and min.amplitude.

Furthermore, parameter ‘free’ gives an additional set-point of the calibrationcurve:

actual value

referencevalue

Fig.30: Calibration curve for offset- and amplitude calibration


20

The calibration of the set-points ‘max’ and ‘min’ is performed for fixedreference values (+/- 10V for offset, 0.1V and 10V for amplitude calibration).For set-point 'free' reference value as well as actual value can be adjusted.With this an arbitrary set-point between ‘min’ and ‘max’ can be calibrated. Alinear approximation is used between the calibration set-points.

By default, the reference value for set-point ‘free’ is adjusted to 0V for offsetcalibration and 5V for amplitude calibration.

Procedure recommended for the adjustment of set-point 'free':- connect a voltage meter to the output connector OUTPUT of the instrument- select ‘free’ using offset- or amplitude- calibration menu- adjust reference value using button 1 (<<<) and/or 3 (>>>)- adjust the value of the voltage meter to the exact value displayed by the

instrument (e.g., +5V for calibration of the max. offset) using the rotaryknob

- press button 2 (ENTER)

Cancellation of Calibration ProcedureIf a modified calibration value should not become permanent or if the wholecalibration process should be cancelled please leave the active calibrationmenu by pressing button MENU .

Termination of the Calibration Procedure (using the new values)To use the new calibration values press EXIT within the calibration menu.


21

Calibration Menu (Overview)

CalibrationOffs Amp EXIT

Calibrate Offsetmin max free

cal. to –10.00V ENTER

Calib. Amplitudemin max free

cal. to +10.00V ENTER

calib. to 0.100V ENTER

calib. to 10.00V ENTER

cal. to= 0.000V<< ENTER >>

calib. to 5.00V<< ENTER >>

Load Defaults?YES EXIT NO

from main Prog

to main Prog

to main Prog

menu

menu

menu

Fig.31: Menu structure offset- and amplitude calibration

WGxx Arbitrary Waveform Generator Software SPro

22

Software SPro (optional)

The optional available software package SPro gives a very comfortable way for designingarbitrary waveforms and loading them into the instrument via the serial interface. The followingoverview refers to Version 2.5 (Nov. 1999).Please contact our Homepage www.mrsys.at for Update-Information.

System Requirements- IBM-compatible PC (>386 with >4MByte RAM recommended)- Windows 3.1 or higher- serial interface (RS232) for connecting the instrument

Software Installation- WIN3.1: with Windows program manager use menu File and select

command run

- WIN95/98: use the START button and select command run

- specify a:setup (or b:setup, if the installation disk is in floppy drive b: )

- now the installation program is loaded

- all further steps are performed automatically, please follow the directivesof the installation program.During installation the installation folder of SPro has to be specified(default value: C:\SPRO).

SPro occupies approximately 700 kByte on our hard disk (Version 2.5).

After successful installation the start list of W95/98 (or the program managerfor W3.1) includes a new program group named "M&R Systems - SPro". Witha double-click to the SPro-Icon, the software package starts.

User Interface – OverviewIf SPro operates in View-Mode (see Fig.32) the signal traces are displayed inseparate Windows as they will appear at the output of the instrumentWYSIWYG). All waveform parameters (amplitude, offset, frequency and theposition of sync-out) are immediately transferred to the instrument if theinstrument is switched to 'Online' mode.

For modifications of the wave shape the software has to be switched to theDesign-Mode. This can be performed via menu item ‘Signalform-bearbeiten’,or by clicking to the ‘Bearbeiten ?’-Tool of the tool box.

The Design-Mode (see Fig.33) displays the total memory region which isavailable for storing the waveform. Now the waveshapes can be designed bycombining graphical objects (dot, line, polygon and mathematical expressions)similar to the application of a CAD program.

WGxx Arbitrary Waveform Generator Software SPro

23

Menüzeile

Einstellfenster für Amplitude, Offset, Frequenz Digitalausgänge anzeigenSync Out anzeigen

SG101 Online/OfflineHOLD- Taste

Betriebsart einstellen

X, Y- AchseMaßstab

Signaldateispeichern/öffnen

vordefinierteSignalformen

Ausgangsspannungs-begrenzung

Umschalten in denBearbeitenmodus

Kurvenfenster (bis zu 4 gleichzeitig darstellbar)

Werkzeugfenster Statuszeile Anzeige der mit der Datenpunktanzahlmöglichen minimalen und maximalen Frequenz

aktuelle Schnitt-stelle

Fig.32: SPro View-Mode (Version 2.5, Nov. 1999)

Menüzeile

Anzeige der Mauszeiger- Koordinaten,bzw. der Eckpunkte eines Objektes beim Verschieben

Anzeige der momentanselektierten Objekte

z.B.: Funktions- Objekt

Datenpunktein Y- Richtung

Datenpunktein X- Richtung

WerkzeugfensterStatuszeile

"Griffe" zum Stecken und Stauchendes selektierten Objekts mit der Maus

Zurückkehren zumDarstellungsmodus

Ändern der Datenpunktanzahl

Fig.33: SPro Design-Mode (Version 2.5, Nov. 1999)

WGxx Arbitrary Waveform Generator Specifications

24

SpecificationsWG810

Standard Signals: Sinusoidal, Square-Wave,

Triangular, DC, Noise

Arbitrary Mode7 arbitrary waveforms

Signal Specifications: Symmetry (DutyCycle): Triangular: Square-Wave: Signal Depth: Amplitude Resolution: Frequency Range (Sinusoidal )

1% ... 99%1% ... 99% tr/tf: <50ns

<2% 1Hz to 2MHz

7 times 4 to 16.384 samples8Bit

Sync. Output Level: Impedance: Rise-/Fall-Time:

TTL50Ω, 5%< 10 ns

Modes: normalinvertpositive pulsenegative pulse

0-180° high , 180-360° low0-180° low , 180-360° highat 180° ; (30ns)at 180° ; (30ns)

falling edge at 1..(n-1)rising edge at 1..(n-1)at 1..(n-1) ; (30ns)at 1..(n-1) ; (30ns)

Frequency Specifications: Waveform: Sinusoidal Triangular Square Wave Arbitrary Sample Rate: Resolution: Accurracy:

Response Time: Jitter ( 1 MHz): Display:

1 range: 1Hz....2MHz1 range: 1Hz....200KHz1 range: 1Hz....2MHz

3 Digits40ppm

120ns< 80psFrequency, Period

61uHz to 2,5MHz1 range: 1S/sec ... 10MS/sec3 digits40ppm (Quartz)

120ns< 80psFrequency, Period, Sample Rate

Output Specifications: Amplitude: Resolution: Accuracy: Output Impedance: Response Time:

0.2Vpp ... 14Vpp (20mV...1.4V using 20dB attenuator)50mV ( 5mV using 20dB attenuator)< 0.5%50Ω 1%5ms

Offset: Resolution: Accuracy: Response Time:

-7V ... +7V (-0,7V ...+0,7V using 20dB attenuator)50mV ( 5mV using 20dB attenuator)< 0.5%5ms

Attenuator: Filter: Isolation:

0dB , -20dB , -120dB (off)500KHz (6th order Bessel response)

48Vp against protection ground (earth)

Modulation Characteristics: Type: Input Voltage: Input Impedance:

FM, AM-5V..+5V

10kΩ 10%

WGxx Arbitrary Waveform Generator Specifications

25

WG810

Standard Signals: Sinusoidal, Square-Wave,

Triangular, DC, Noise

Arbitrary Mode7 arbitrary waveforms

Frequency Sweep internal: Type: Direction: Start Frequency: Stop Frequency: Sweep Time: Update Rate:

linear, logarithmic, exponentialincreasing frequency, decreasing frequency61µHz ... 2.5 MHz61µHz ... 2.5 MHz100ms to 999.9s with 100ms steps20ms

Triggering: Type:

Trigger Level:

Continuous continuous,one Shot (via button),external (via modulation input)TTL falling edge

Frequency MeasurementCharacteristic: Range: Display: Resolution: Accuracy: Measuring Time: Input Voltage: Input Impedance:

2Hz to 10MHz (7 decades, auto ranging)frequency and period simultaneously!4 digits in 7 decades< 0.1% of final value of rangemin. 100ms , max. 1.5 cycles2Vpp to 50Vpp1 kΩ

System Characteristics: Frequency Memory: 3 + actual value Amplitude Memory: 3 + actual value Offset Memory: 3 + actual value Waveforms: 5 standard signals 7 traces w. 16384 points each Sync. Position Memory: 3 + actual value Duty Cycle Memory: 3 + actual value Interface RS232 / 56kBaud PC loading time: <20s per waveform

Operating Parameters: Reference Temperature: 24°C ±2°C Operating Temperature: 0°C to +45°C Storage Temperature: -10°C to +70°C Power Supply: 12V AC 50/60Hz 25VA Dimensions: W*H*D [mm]= 240*90*270 Weight: ~2.5 kg

Documents

120056 an 01 en Signalgenerator WG 820