SPS5000X series service manual
Verify output voltage accuracy
Test overview: In the two-wire or four-wire mode, under the rated input
voltage, test the actual output voltage and readback voltage value relative to
the set voltage; reflect the voltage accuracy of the power supply.
Formula: Setting voltage accuracy =
∆𝑉𝑜
𝑉
𝑠𝑒𝑡
∗ 100%
（
5
）
Formula: Readback voltage accuracy =
∆𝑉
𝑏𝑎𝑐𝑘
𝑉
𝑠𝑒𝑡
∗ 100%
（
6
）
Preset conditions: room temperature
Test instrument: adjustable transformer, multimeter
Test methods and steps:
(a) Take SPS5081X as an example :The input of the SPS5081X is set to
220V by the variable transformer, the output terminal connect to the electronic
load, and
the multimeter meter pen connect to the positive and negative
terminals of the power output terminal in parallel.
(b) Turn on the power of each device and set the multimeter to the auto range
of the DCV gear.
(c) The output of SPS5081X set to 80V/0.1A. Turn on the output and note the
reading of the multimeter and the voltage readback value of the power when
the SPS5081X is without loading.
(d) Set the SPS5081X to 60V/0.1A, 48V/0.1A, 36V/0.1A, 24V/0.1A, 18V/0.1A,
12V/0.1A, 5V/0.1A, 1V/0.1A, In each setting, repeat step (c)separately.
(e) Calculate the corresponding setting voltage accuracy by the formula (5)
and the readback voltage accuracy by the formula
（
6
）
. Take the maximum
value in the calculation result to determine whether the SPS5081X has
reached the predetermined specification.
Table 2-6
Model
SPS5081X
Mode
Set Volt (V)
Measured Volt (V)
Readback Volt
(V)
Pass /
Fail
2 wire
80V
60V
48V
36V
24V
18V
12V
5V
