National Instruments RMX-4120 User Manual page 47

Chapter 2 Basic Functions
The OCP•OVP key LED turns off, and the RMX programmable power supply returns to
the measured value display.
Checking OVP and OCP Operation
The OVP and OCP functions are designed to protect the load.
If you use the CONFIG settings to limit the voltage setting (CF15: ON), you will no longer be
able to set the output voltage to a value that exceeds the OVP trip point. This means that you
won't be able to check the operation of the OVP function. If you use the CONFIG settings to
limit the current setting (CF14: ON), you will no longer be able to set the output current to a
value that exceeds the OCP trip point. This means that you won't be able to check the operation
of the OCP function.
Complete the following steps to check the operation of the OVP function. Ensure CF15 is set to OFF.
1. Check that the OUTPUT LED in the display area is turned off.
2. Set the output voltage to a value lower than the OVP trip point.
3. Press OUTPUT to turn output on. The OUTPUT LED lights.
4. Slowly turn the VOLTAGE knob clockwise.
When the output voltage exceeds the OVP trip point, the front panel display area's ALARM
LED lights and the OUTPUT LED blinks to indicate that the OVP function has been
activated.
Blinking (in orange)
5. Check that output has turned off.
6. Turn the POWER switch off.
Complete the following steps to check the operation of the OCP function. Ensure CF14 is set to OFF.
1. Short the output terminal.
2. Turn the POWER switch on.
3. Check that the OUTPUT LED in the display area is turned off.
4. Set the output current to a value lower than the OCP trip point.
5. Press OUTPUT to turn output on. The OUTPUT LED lights.
6. Slowly turn the CURRENT knob clockwise.
When the output current exceeds the OCP trip point, the front panel display area's ALARM
LED lights, and the OUTPUT LED blinks to indicate that the OCP function has been
activated.
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Figure 2-18. Display of the OVP Activation Alarm
Lit