PS280 and PS283 Performance Verification
Handheld and Benchtop Instruments Basic Service
9
6. Set the digital multimeter to measure a DC current of at least 1 A (PS280) or
0.5 A (PS283).
7. Connect the digital multimeter and load resistors to the + and – terminals of
the power supply MASTER output as shown in Figure 2. See Table 7 for the
appropriate load resistor values.
8. Verify that the power supply output current varies less than 0.2%
±5 mA
while shunting load resistor RL1 with the shorting strap. See Figure 2 above.
Constant Current Ripple and Noise Check
To check the constant current ripple and noise performance of your power
supply, perform the following tests.
–+
Power supply
Test oscilloscope
R
S
R
L
Figure 3: Constant Current Ripple and Noise Test Setup
The following check verifies the MASTER current ripple.
1. Set the power supply to the INDEP operating mode by disengaging both
TRACKING switches (both switches out).
2. Set the power supply MASTER AMPS/VOLTS meter selection switch to
VOLTS.
3. Set the power supply to 25 VDC using the digital display.
4. Connect the test oscilloscope and load resistors to the + and – terminals of
the MASTER output as shown in Figure 3. See Table 8 for the appropriate
load resistor values.
5. Verify that the peak-to-peak ripple viewed on the oscilloscope is less than
3 mV.
MASTER Current Ripple
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