Chapter 3 Constant Current Tests
DP1308A Performance Verification Manual
3-8
CC Programming and Readback Accuracy
Programming accuracy and readback accuracy verify the high accuracy and
programmable performance of the power supply.
1.
Turn off DP1308A. Connect DP1308A, AC source, current monitoring resistor
(0.1Ω) and multimeter.
2.
Turn on the AC source and set its voltage to the AC line voltage.
3.
Measure the programming accuracy and readback accuracy under 0A current.
1)
Turn on DP1308A. Execute the following operations via the remote interface
(USB, LAN or GPIB):
Send command to select the channel to be tested and set its voltage and
current (according to the Table 3-4):
APPLy P6V,5,0 (for +6V/5A channel)
APPLy P25V,5,0 (for +25V/1A channel)
APPLy N25V,-5,0 (for -25V/1A channel)
Send the OUTPut:STATe {P6V|P25V|N25V},ON command to enable
the output of the channel to be tested.
2)
Turn on the multimeter and select DCV measurement function. The output
status of the power supply should be CC. Read and record the current
reading U
1
on the multimeter and calculate the current I
1
=U
1
/R.
3)
Send the MEASure:CURRent? {P6V|P25V|N25V} command via the
remote interface (USB, LAN or GPIB) to read and record the current I
2
.
4)
Calculate the programming accuracy: |I
1
-0|;
calculate the readback accuracy: |I
2
-0|.
5)
Compare the measurement results with the specifications in “Appendix B:
Specifications”.
Table 3-4 Setting and specification of CC programming and readback accuracy test
(0A current)
Channel
+6V/5A
+25V/1A
-25V/1A
Voltage (V)
5
5
-5
Current (A)
0
0
0
Specification
Programming: 0.5mA
Readback: 0.5mA
Programming: 0.1mA
Readback: 0.1mA
