Model 2380-500-30 Programmable Instruments
Section 3: Performance Verification
2380-500-30-905-01 Rev. A / November 2015
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Figure 2: DC current accuracy test setup
2. Set the DVM to DC voltage measuring mode and auto range mode.
3. Set the electronic load as follows:
Mode:
CC
Range: CCL for low range, CCH for high range
Current: 0.1 A for low range, 1 A for high range
4. Set the DC source as follows:
Current: greater than electronic load’s rated current value
Voltage: less than 10% of electronic load’s rated voltage
5. Vary the current of the electronic load from the minimum to maximum of its range. Turn on the
output for DC source first and then turn on the input of the electronic load.
6. Record the reading values when the DVM measurement data is stable.
Record the electronic load’s measured current value on VFD (displayed value).
Record the DVM reading value, for example the shunt voltage.
Record the electronic load’s current setting.
7. Vary the current of the electronic load by sampling the low, median, and high points of its range,
then repeat step 6.
8. Turn off the DC source and electronic load, then switch the electronic load to high current range
(CCH).
9. Set the DC source and electronic load according to steps 3 and 4, then repeat steps from 5 through
8.
10. Power off all the equipment after the test.
11. Calculate the deviation and determine whether it is within the specification.
The measured actual current: DVM reading voltage /shunt resistance
Current setting accuracy: the measured actual current versus current setting value
Current read-back accuracy: The measured actual current versus the display current value
on VFD
