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Example Programs
Pulse Measurements
The following programs illustrate how to make a pulse measurement over the GPIB. The measurement
function is set to ACDC, which gives the best results for current waveforms that have ac content. The
measurement incorporates 100 readings taken at time intervals of 20 microseconds, for a total
measurement time of 2 milliseconds. The trigger point for the pulse measurement occurs at 0.1 amperes
on the positive slope of the current pulse. The measurement offset is programmed so that 20
measurement points prior to the trigger are also returned as part of the measurement sample.
Because measurement triggers are initiated by the output pulse, a FETCh command is used to return the
measurement data. FETCh commands are also used to return the MAXimum, MINimum, HIGH, and
LOW values of the measurement. MEASure commands cannot be used to return data in this example
because they always acquire NEW measurement data each time they are used.
To produce the output pulses in this example, an electronic load must be connected and programmed to
generate 3-ampere pulses with a duty cycle of 100 microseconds at 1000 Hz. The dc source address is
705, and the load address is 706. If required, change these parameters in the appropriate statements.
Current Pulse Measurement Using BASIC
10 !Rev A.00.00
20 OPTION BASE 1
30 DIM Curr_array(100)
40 !
50 ASSIGN @Ps TO 705
60 ASSIGN @Ld TO 706
80 OUTPUT @Ps;"*RST" ! Sets supply to default values
90 OUTPUT @Ps;"OUTP ON" ! Turn on power supply output
100 OUTPUT @Ps;"VOLT 5" ! Program power supply to 5 volts
110 !
120 OUTPUT @Ld;"CURR:LEVEL 0" ! Set up electronic load to produce
pulses
130 OUTPUT @Ld;"CURR:TLEVEL 3"
140 !
150 OUTPUT @Ld;"TRAN:FREQ 1000"
160 OUTPUT @Ld;"TRAN:DCYCLE 10"
170 OUTPUT @Ld;"TRAN:MODE CONT"
180 OUTPUT @Ld;"TRAN:STATE ON"
190 !
200 OUTPUT @Ps;"SENS:CURR:DET ACDC" ! Set meter to ACDC
210 OUTPUT @Ps;"SENS:CURR:RANG MAX" ! High Current range
220 OUTPUT @Ps;"TRIG:ACQ:SOUR INT" ! Set to trigger on pulse
230 OUTPUT @Ps;"SENS:FUNC ""CURR""" ! Acquire current reading
240 OUTPUT @Ps;"TRIG:ACQ:LEV:CURR .1" ! Trigger at 0.1 amps
250 OUTPUT @Ps;"TRIG:ACQ:SLOPE:CURR POS" ! Trigger on positive slope
260 OUTPUT @Ps;"TRIG:ACQ:HYST:CURR .05" ! Set hysteresis of trigger
270 OUTPUT @Ps;"SENS:SWE:TINT 20E-6" ! Set sample time interval to 20us
280 OUTPUT @Ps;"SENS:SWE:POIN 100" ! Set number of measurement samples
in sweep