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Front Panel Operation - 5
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5 - Querying and Clearing Output Protection and Errors
When overvoltage, overcurrent, or overtemperature condition occurs, the Prot annunciator on the front panel
will be on and the electronic load will disable its output.
Error messages can occur at any time during the operation of the unit. When the Err annunciator on the front
panel is on, it means that either an error has occurred on the GPIB bus, or a selftest error has occurred. Appendix
C lists error numbers and descriptions.
Query and clear the electronic load overcurrent protection as follows:
Action Display
1. On the Function keypad, press Protect. In this example, an overcurrent condition
has occurred.
OC
2. To restore normal operation after the cause of the overcurrent condition has been
removed, press Shift, Prot Clr. The Prot annunciator then will go off.
Query and Clear Errors as follows:
1. On the Function keypad, press Shift, Error. This displays and clears the error in
the error queue. Repeatedly press these keys to clear all errors in the queue. If errors
persist, your unit may require service.
ERROR 0
6 - Making Basic Front Panel Measurements
As shipped from the factory, front panel measurements for the input are calculated from a total of 1000 readings
taken at a 10 microsecond sampling rate. The unit alternates between voltage and current measurements.
Therefore, the data acquisition time for a single front panel voltage or current measurement is about 100
milliseconds.
There are no trigger controls for front panel measurements. However, you can program both the sampling rate
and the number of data points in each front panel measurement using commands in the Sense menu. With this
flexibility, measurement accuracy can be improved for waveforms with frequencies as low as several Hertz. The
sample buffer size may be varied from 1 to 4096 data points. The sampling rate may be varied from 10
microseconds to 32 milliseconds. Values are rounded to the nearest 10 microsecond interval.
To have the unit turn on with the reconfigured buffer size and sampling rate, save this state in location 0.
NOTE: If the front panel display indicates OVLD, the output has exceeded the measurement capability
of the instrument. This can occur when the measurement has been set to the Low range. If the
front panel display indicates -- -- -- -- -- -- , a GPIB measurement is in progress.
Use the Meter menu for making front panel measurements:
Action Display
1. On the Function keypad press Meter to access the following measurement
parameters:
Displays the voltage and current of the selected channel
Displays the maximum voltage
Displays the minimum voltage
Displays the rms voltage
Displays the maximum current
<chan> <voltage> <current>
<chan> <value> V MAX
<chan> <value> V MIN
<chan> <value> V RMS
<chan> <value> A MAX