Chapter 3 Constant Current Tests
RIGOL
DP1308A Performance Verification Manual
3-7
CC Ripple and Noise (Normal Mode)
Current ripple and noise is usually specified as RMS.
1.
Turn off DP1308A. Connect DP1308A and AC source according to Figure 3-1.
Note that in order to eliminate the noise introduced by the electronic load, use
resistive load (1.2Ω for +6V/5A channel; 25Ω for +25V/1A and -25V/1A channels)
to replace the electronic load in Figure 3-1. Then connect the RMS voltmeter
across the resistive load.
2.
Turn on the AC source and set its voltage to the AC line voltage.
3.
Turn on DP1308A and press +6V, +25V or -25V at the front panel to select the
channel to be tested. Set the voltage and current of the channel under test
according to Table 3-3. Press On/Off under the channel to be tested to enable
power output.
4.
Turn on the RMS voltmeter. The output status of the power supply should be CC.
Measure the RMS voltage V
rms
on the load resistor and calculate the RMS of the
current V
rms
/R.
5.
Compare the measurement value with the specifications in “Appendix B:
specifications”.
6.
Repeat steps 1 to 5 to test the CC ripple and noise of the other two output
channels.
Table 3-3 Setting and specification of CC ripple and noise test
Channel
+6V/5A
+25V/1A
-25V/1A
Voltage (V)
6.3
26.25
-26.25
Current (A)
5
1
1
Specification
(Normal Mode)
<2 mArms
<500 uArms
