ESR Meter - simple tester electrolytes ESR is the equivalent series resistance capacitor. You can imagine it as a resistor connected in series with an ideal capacitor. Now the value of this resistance ESR. One of the most common defects consumer electronics are just bad electrolytic capacitors. They are using a multimeter or meter capacity usually can not be identified. ESR meter reliably find fault electrolyte, the electrolyte because the damage will be reflected first on increasing ESR. The great advantage is that you do not expel capacitor because the measurement voltage is small and thus do not affect the measurement of ambient parts (unlike meter capacity, which can not be measured in a plate capacitors). For electronics repairman ESR meter is an absolute necessity, used when troubleshooting even more than multimeter! The measurement principle is simple: The capacitor is connected alternating current high frequency (typically 50-100kHz) and measuring the voltage drop on him. Greater loss means higher ESR. On the Internet there are many structures ESR meter. But mostly very complicated and utilize a microprocessor. Others have just one indication LED, when measuring various large electrolytes insufficient. I chose a simple and effective option. As a source of RF power at a frequency of about 50 kHz is used known circuit 555. The drop measurement is used small moving coil gauge. You can use a small microammeter or millivolt be sufficient for an analog tuning indicator of an old radio or light excitation (VU meter) of tape. The rectification diode D1 is used with low dropout voltage, it can be a germanium diode (found in any older radio) or Schottky diode type. Include dial gauge D2 protects against excessive voltages at the time when no capacitor is connected. The values of resistors R1 and R2 must be used to customize the gauge. R2 is selected so as to not go idle hand too "around the corner" and R1 determines the sensitivity. Test leads should be short (max 30-40 cm) to its resistance and inductance did not affect the measurement. Connections is also advisable to do double (shown in the diagram). Larger electrolytes are obviously smaller ESR, so it is advisable to scale the typical brand new ESR values of capacitors. Suffice logarithmic scale example. 1uF, 10uF, 100uF, 1000uF. The meter is supplied platelet 9V battery. Idling takes about 6 mA, the measurement max. 16 mA. Scheme bleating ESR - tester electrolytic capacitors. "Guts" meter.
ESR is the equivalent series resistance capacitor. You can
imagine it as a resistor connected in series with an ideal
capacitor. Now the value of this resistanceESR.One of the most
common defects consumer electronics are just bad electrolytic
capacitors. They are using a multimeter or meter capacity usually
can not beidentified. ESR meter reliably find fault electrolyte,
the electrolyte because the damage will be reflected first on
increasing ESR. The great advantage is thatyou do not expel
capacitor because the measurement voltage is small and thus do not
affect the measurement of ambient parts (unlike meter capacity,
whichcan not be measured in a plate capacitors). For electronics
repairman ESR meter is an absolute necessity, used when
troubleshooting even more thanmultimeter!The measurement principle
is simple: The capacitor is connected alternating current high
frequency (typically 50-100kHz) and measuring the voltage drop
onhim. Greater loss means higher ESR.On the Internet there are many
structures ESR meter. But mostly very complicated and utilize a
microprocessor. Others have just one indication LED, whenmeasuring
various large electrolytes insufficient. I chose a simple and
effective option. As a source of RF power at a frequency of about
50 kHz is usedknown circuit 555. The drop measurement is used small
moving coil gauge. You can use a small microammeter or millivolt be
sufficient for an analog tuningindicator of an old radio or light
excitation (VU meter) of tape. The rectification diode D1 is used
with low dropout voltage, it can be a germanium diode(found in any
older radio) or Schottky diode type. Include dial gauge D2 protects
against excessive voltages at the time when no capacitor is
connected. Thevalues of resistors R1 and R2 must be used to
customize the gauge. R2 is selected so as to not go idle hand too
"around the corner" and R1 determines thesensitivity. Test leads
should be short (max 30-40 cm) to its resistance and inductance did
not affect the measurement. Connections is also advisable to
dodouble (shown in the diagram).Larger electrolytes are obviously
smaller ESR, so it is advisable to scale the typical brand new ESR
values of capacitors. Suffice logarithmic scale example.1uF, 10uF,
100uF, 1000uF. The meter is supplied platelet 9V battery. Idling
takes about 6 mA, the measurement max. 16 mA.
