SPS5000X series service manual
1V
4 wire
80V
60V
48V
36V
24V
18V
12V
5V
1V
Verify output current accuracy
Test overview: under the rated input voltage, test the actual output current and
readback current value relative to the set voltage; reflect the current accuracy
of the power supply.
Formula: Setting current accuracy =
∆𝐼𝑜
𝐼
𝑠𝑒𝑡
∗ 100%
（
7
）
Formula: Readback current accuracy =
∆𝐼
𝑏𝑎𝑐𝑘
𝐼
𝑠𝑒𝑡
∗ 100%
（
8
）
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,
turn on the power of each device, set the electronic load to constant voltage
mode, the multimeter set to the DCI gear, and the multimeter pen connect to
the electronic load in series.
(b) Set the SPS5081X to 0A/80V, turn on the output, and set the electronic
load to 79.5V.record the reading of the multimeter and the current readback
value of the power.
(c) Set the SPS5081X to 0.1A/80V
，
1A/80V
，
2A/80V
，
4A/80V
，
6A/60V,
9A/40V, 12A/30V, 15A/24V, in each setting, repeat step (b)separately.
(d) Calculate the corresponding setting current accuracy by the formula (7)
and the readback current accuracy by the formula
（
8
）
. Take the
maximum value in the calculation result to determine whether the
SPS5081X has reached the predetermined specification.
Table 2-7
