Keithley 2260B-30-36, Adjustment Manual, Page: 13 / 55

Series 2260B Programmable Power Supplies Verification and Adjustment Manual Section 3: Constant voltage verification
077104802 / November 2016 3-3
Before proceeding, make sure that the 2260B instrument is off.
To perform CV load regulation verification:
1. Connect the AC power supply to the 2260B.
2. Connect the DMM on the PCS-1000 directly across the +S and -S terminals to an electronic DC
load, as shown in the 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 output current to its maximum value and
the output voltage to the maximum rated value (see Series 2260B available models (on page 1-
1)).
5. On the 2260B press the Output button.
6. On the electronic DC load instrument, set the output load to 1 A. Note that CV is displayed on the
2260B front panel. If CV is not displayed, adjust the load so that the output current drops and CV
is displayed.
7. Record the DMM output voltage reading.
8. Open the load and record the DMM voltage reading.
The difference between the DMM readings in steps 7 and 8 is the load effect, which should not
exceed the value listed in the test record form (see
Verification test record forms (on page 5-1) for the
appropriate model, under CV load regulation).
Verifying CV load regulation is complete.
Constant voltage line regulation verification
This test measures the change in output voltage resulting from a change in AC line voltage from the
minimum to maximum value within the line voltage specifications.
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 3: 2260B Constant voltage line regulation