SPS5000X series service manual
Model
Set Curr (A)
Measured Curr
(A)
Readback Curr
(A)
Pass /
Fail
SPS5081X
0.1A
1A
2A
4A
6A
9A
12A
15A
Verify output ripple and noise
Test overview:
Ripple: The ripple is the AC component superimposed on the output of DC
voltage; The ripple voltage is the peak-to-peak value between the peaks and
valleys of the fingerprint wave; during each on and off process, the electric
energy is extracted from the input terminal to the output terminal to form a
process of charging and discharging, thereby causing fluctuations in the
output voltage.
noise:
(1) Noise voltage refers to its peak-to-peak value, in switching power supplies,
there are two main reasons for formation:
(a) A high-frequency pulse train generated by the switching power supply
itself, which is caused by a sharp pulse generated when the switch is turned
on and off.
(b) Interference from external electromagnetic fields, entering the switching
power supply through radiation or entering the switching power supply through
the power line;
(2) In the switching power supply, the noise is mainly related to the switching
process of the system.
Preset conditions: room temperature
Test instrument: oscilloscope, common probe (with 1:10 probe),electronic load
Test environment: 220V power supply, SPS5081X set output to 24V/15A ,full
load output, electronic load set to 14.96A .
Test methods and steps:
(a). The probe is grounded in the shortest grounding manner. It is
recommended to use a grounding spring well connected to the SPS5081X
sense terminal.
(b). The oscilloscope turn on the bandwidth limit of 20MHz, set the appropriate
time base and storage depth to ensure the sampling rate is 100M/s, set the
probe amplification factor to 1:1, the coupling mode is AC coupling, turn on
the statistical function, and record the valid value, peak-to-peak value,
