Form Number TM61312-4
Rev 2 Aug 2007
Page 18
Testing the Capacitance Function (for 61-312 / 61-314)
Th
m
m
gr
e meter measures capacitance by charging the capacitor with a known direct current,
easuring the resultant voltage, and calculating the capacitance. If the same capacitance is
easured on an impedance bridge, a different reading may result. This variance is likely to be
eater at higher frequencies.
To verify the accuracy of the capacitance measuring function, do the following:
1. Apply the capacitor to the
V
Ω
Hz
and
COM
inputs on the meter. For steps1 through 6 i
Table 6.
n
2.
Turn the rotary switch to
.
3. Compare the reading on the meter display to the reading in Table 6.
Note:
The meter selects the proper range automatically. Each measurement takes about
one second per range. Readings >40.00
μ
F will take
≥
5 to 10seconds
t
4. If the display reading falls outside of the range shown in Table 6, the meter does not mee
specification.
Table 6 Capacitance Test:
Step
Range Source
Reading
1
40nF
10.000nF
9.65 to 10.35
2
40nF
30.00nF
29.05 to 30.95
3
400nF
300.0nF
290.5 to 309.5
4
4µF
3.000µF
2.905 to 3.095
5
40.00µF
30.00µF
29.05 to 30.95
6
100.0µF
100.0µF
96.5 to 103.5
Checking the Diode Test Function (for 61-312 / 61-314)
To check the diode test function, do the following:
1. Connect the DVM (Digital Voltage Meter) leads to the
V
Ω
Hz
and
COM
inputs on the
meter.
2. Turn the meter’s rotary switch to
.
The DVM display should display OL
3. Insert a Si diode with correct polarity “+” and “-“
The meter display should read within 0.5~0.7Vdc
4. Reverse polarity on the Si diode
The meter display should read OL
5. Apply a 20-ohm resistor to the meter, the built-in buzzer buzzes.
.