Keithley 2260B-30-36, Adjustment Manual, Page: 22 / 55

Section 4: Constant current verification Series 2260B Programmable Power Supplies Verification and Adjustment Manual
4-6 077104802 / November 2016
Constant current noise verification
This test measures the AC output voltage with the PCS-1000 and DMM.
Hazardous voltages may be present on all output and guard terminals. To prevent electrical
shock that could cause injury or death, never make or break connections to any of the
instruments used for this verification test while instruments are powered on. Turn off the
2260B instrument from the front panel or disconnect the main power cord from the rear of
the instrument before handling cables. Putting the equipment into an output-off state does
not guarantee that the outputs are powered off if a hardware or software fault occurs.
Precautions must be taken to prevent a shock hazard by surrounding the test device and
any unprotected leads (wiring) with double insulation for up to 800 volts depending on the
power supply that you have, Category I.
Figure 8: 2260B Constant current noise verification
Before proceeding, make sure that the 2260B instrument is off.
To perform CC noise verification:
1. Connect the AC power supply.
2. Connect the PCS-1000 current input across the +S and -S terminals through an electronic DC
load (see previous figure).
3. Turn on the 2260B and, if necessary, all of the other instruments.
4. Press the Set button on your 2260B and program the power supply output current to its maximum
value and the output voltage to 15 volts (see Series 2260B available models (on page 1-1), if
needed).
5. On the 2260B press the Output button.
6. Use the DMM to measure the RMS noise voltage using AC voltage (see previous figure).
The result should not exceed the RMS limits in the test record form (see Verification test record forms
(on page 5-1) for the appropriate model, under CV ripple and noise - RMS, if needed).
Verifying CC ripple and noise is complete.