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OBTAINING DATA:
The steps involved in obtaining data from the power supply follow a similar formats as in
sending data. However, additional commands (Enter and Print) are necessary to view the data. For example, to
query the programmed voltage of the previous example, send:
OUTPUT 512; VSET?
Although a query has been sent to the power supply, there has been no command given to view the data. At this
moment the power supply holds the VSET value in a sample/hold circuit till the proper command has been
executed. Therefore, to retrieve data onto the screen, send:
10 ENTER 512;Vo
20 PRINT "VOLTAGE SETTING OF OUTPUT= ";Vo
The PPS Series are capable of outputting output voltage and current to the bus. Therefore, one may send queries to
read in the values from the supply . In our example we set an output voltage of 11V and current of 1.7A. Let us
recall these actual output values.
To query the voltage output of the power supply, send:
OUTPUT 512; VOUT?
Now, proceed to obtain the voltage output value:
50 ENTER 512;Vs
60 PRINT "VOLTAGE OUTPUT= ";Vs
The screen now shows a value of approximately 11V.
To query the current output of the power supply, send:
OUTPUT 512; IOUT?
Now, proceed to obtain the current output value:
80 ENTER 512;Is
90 PRINT "CURRENT OUTPUT= ";Is
Now, simply short the output terminals, and the LCD screen will now display a value of approximately 1.7 amps.
The same methods presented here hold true for programming overvoltage and overcurrent protection as well as
other GPIB commands.
In order to return the supply to local mode, press the
"LCL"
key on the front panel.
<NOTE:>
Attempting to modify values/conditions via the front panel display during remote operation is not
possible (except the local function key). However, values/conditions may be monitored during remote
operation.