Chapter 3 Constant Current Tests
RIGOL
DP1308A Performance Verification Manual
3-5
CC Linear Adjustment Rate (CC Source Effect)
CC linear adjustment rate is used to measure the variation of output current of the
power supply due to source effect under constant current (CC).
1.
Turn off DP1308A. Connect DP1308A, AC source, current monitoring resistor,
electronic load and multimeter according to Figure 3-1. Note that the
measurement probe or clip of the multimeter must be connected to A in Figure
2-2.
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 to be tested
according to Table 3-2. Press On/Off under the channel to be tested to enable
power output.
4.
Turn on the electronic load and set it to CV mode. Set its voltage to
approximately the rated output voltage of the channel under test and the output
status of the power supply channel under test should be CC.
5.
Turn on the multimeter and select DCV measurement function. Read and record
the current reading U
0
on the multimeter and calculate the current U
0
/R.
6.
Adjust the AC source to undervoltage state (namely 10% drop in amplitude, refer
to Table 2-1). Read and record the current reading U
1
on the multimeter and
calculate the current U
1
/R.
7.
Adjust the AC source to overvoltage state (namely 10% rise in amplitude, refer
to Table 2-1). Read and record the current reading U
2
on the multimeter and
calculate the current U
2
/R.
8.
Calculate
%
100
/
|
/
/
|
0
0
1
×
−
−
R
U
I
R
U
R
U
offset
and
%
100
/
|
/
/
|
0
0
2
×
−
−
R
U
I
R
U
R
U
offset
respectively to get the measurement results of load adjustment rate. Wherein,
offset
I
(about 250 uA) is the offset caused by error.
