Programmable Power Supplies Verification and Adjustment Manual Section 4:
Constant current verification
077104802 / November 2016 4-3
Constant current load regulation verification
This test measures the change in output current resulting from a change from full scale to short
circuit.
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 6: 2260B Constant current load regulation
Before proceeding, make sure that the 2260B instrument is off.
To perform CC load regulation verification:
1. Connect the AC power supply.
2. Connect the current input on the PCS-1000 across the +S and -S terminals through an electronic
DC load, as shown in the previous figure.
3. Turn on the 2260B and, if necessary, all of the other instruments.
4. With the electronic load in CR mode, press the Set button and program the 2260B output voltage
to 15 volts.
5. Press the Output button on your 2260B.
6. Using the electronic load, set the output current to the maximum rated output. Note that CC is
displayed on the 2260B front panel. If CC is not displayed, adjust the load so that the voltage
drops and CC is displayed.
7. Record the PCS-1000 input current reading.
8. Short the electronic load and record the indicated current reading on the PCS-1000.
The difference in the current readings in steps 7 and 8 is the load effect, which should not exceed the
value listed in the test record form for the appropriate model (see Verification test record forms
(on
page 5-1) for the appropriate model, under CC load regulation, if needed).
Verifying CC load regulation is complete.
To Next Page
Loading...
Need help?
General
