Operator`s manual

17
Current Test
Use the following procedure to verify proper operation of both the AC and DC mA measurement
functions:
1. Select DC mA, 200µA range.
2. Connect the calibrator HI amps output to the V-Ω terminal and the calibrator LO amps output to the
COM terminal.
3. For each step in Table 6, select the listed range, program the calibrator for the corresponding UUT
input, and verify that the UUT display value lies within the indicated limits.
4. Set the FUNCTION switch to the AC mA position and select the 20 mA range.
5. Program the calibrator for a UUT input of 19.000 mA rms at a frequency of 100 Hz.
6. Verify that the UUT display value lies between 18.890 and 19.110.
Table 6. Direct Current Test
Resistance Test
Use the following procedure to verify the accuracy of the kΩ measurement function:
1. Select kΩ, 200Ω range.
2. Connect the calibrator HI ohms output to the V-Ω terminal and the calibrator LO ohms output to the
COM terminal.
3. For each step in Table 7, select the listed range, program the calibrator for the corresponding input
to the UUT and verify that the UUT display is within the indicated limits.
Table 7. Resistance Test
STEP
SELECT
RANGE
INPUT
DISPLAY
READING
1
2
3
4
5
6
7
200Ω
200Ω
2kΩ
20kΩ
200kΩ
2000kΩ
20MΩ
Short
100Ω
1 kΩ
10kΩ
100kΩ
1000kΩ
10MΩ
00.00 to 00.07
99.86 to 100.14
.9988 to 1.0012
9.988 to 10.012
99.88 to 10.012
997.3 to 1002.7
9.973 to 10.027
Calibration Adjustments
The calibration adjustment procedure should be used any time your instrument has been repaired or fails
to pass the Performance Test. Adjust R306A, R336A if U301, U308 are replaced or if VR302, VR304 do
not have enough adjustment range. Replace U501 if VR502 does not have enough adjustment range.
The RMS Converter Offset Adjustment should not normally need to be done. Adjust only if VR501 (AC)
does not have enough adjustment range or if the display reads .0010 or greater with AC V, 2V range
selected and the input shorted.
NOTE Allow the UUT to warm up a minimum of 5 minutes and conduct the calibration at an ambient
temperature of 23 ± 5°C (73 ± 9 °F).
STEP
SELECT
RANGE
INPUT
DISPLAY
READING
1
2
3
4
5
6
200µA
2mA
20mA
200mA
2000mA
20A
190µA
1.9mA
19mA
190mA
1900mA
19A
189.61 to 190.39
1.8961 to 1.9039
18.961 to 19.039
189.61 to 190.39
1894.1 to 1905.9
18.941 to 19.059