RIGOL
Chapter 3 Constant Current Test
DP1116A Performance Verification Manual
3-8
CC Ripple and Noise (Normal Mode)
The current ripple and noise are usually expressed in RMS form. In the following
section, the specifications at 16V/10A scale and 32V/5A scale are tested.
Specification:
Ripple and Noise (20 Hz to 20 MHz)
Normal Mode Current
< 2 mA rms
Test Procedures:
1.
Turn off DP1116A. Connect DP1116A, AC power supply, current sampling resistor
and RMS voltmeter according to Figure 3-1.
2.
Connect the RMS voltmeter across the current sampling resistor.
3.
Turn on the AC power supply and set its voltage to 220 V.
Note: the value set in this step should be accordance with the value selected by
the voltage selector in the rear panel of DP1116A.
4.
Turn on DP1116A. Press 16V/10A at the front panel to set the scale to be
tested to 16V/10A. Set the voltage and current of the scale to be tested
according to Table 3-3. Press On/Off to enable the output of the power supply.
5.
Turn on the RMS voltmeter and select ACV measurement mode. Make sure that
the power supply is in CC mode and measure the RMS voltage (V
rms
) on the
current sampling resistor.
6.
Calculate the CC ripple and noise (Vrms/R
M
).
7.
Press 32V/5A at the front panel and repeat steps 1 to 6 to test the ripple and
noise at 32V/5A scale.
Test Record Form:
Table 3-3 CC Ripples and Noise Test Record Form
Scale
16V/10A
32V/5A
Specification
< 2 mA rms
DP1116A
Setting
Volt (V)
16.8
33.6
Current (A)
10
5
Measurement
Value
Vrms
Vrms/R
M
