SPS5000X series service manual
（
2
）
Constant current mode
Test Overview: In the case of rated input voltage, change the output load
within the full load range and test the fluctuation of the output current at this
time.It reflect the ability of the circuit to maintain a predetermined output
current when change the load.
Preset conditions: room temperature
Test instrument: adjustable transformer, multimeter, electronic load
Test methods and steps:
(a) Take SPS5081X as an example :The input of the SPS5081X is set to
220V by the variable transformer, after turn on the power of each device, the
electronic load set to constant voltage mode, the multimeter set to the 10A
range of the DCI gear, and the multimeter pen connect to the electronic load
in series.
(b) The output of SPS5081X set to 2A/80V, turn on the output, and the
electronic load set to 79.5V
，
record the current reading value of the
multimeter at this time.
(c) Set the voltage of the electronic load to 5V, 12V, 24V, 40V, 60V, 80V in
turn, and record the reading value of the multimeter in each setting.
(Considering that when the connected wire between the electronic load and
the SPS5081X have current flows, the voltage have wire loss, so the voltage
of the electronic load should be adjusted according to the actual wire loss to
make the SPS5081X works in the constant current mode)
(d) Set the SPS5081X to 2A/80V, 6A/60V, 9A/40V, 15A/24V in each setting,
repeat step (b)
、（
c
）
separately.
(f) Take the max-min value in the calculation result to determine whether the
SPS5081X has reached the predetermined specification.
Table 2-5
Model
SPS5081X
Vo
Io
5V
12V
40V
60V
80V
regulation
rate
2A
6A
9A
15A
