Pulse Measurements - Agilent Technologies 66111A User Manual

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.
Example 3. 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"
90 OUTPUT @Ps;"OUTP ON"
100 OUTPUT @Ps;"VOLT 5"
110 !
120 OUTPUT @Ld;"CURR:LEVEL 0"
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"
210 OUTPUT @Ps;"SENS:CURR:RANG MAX"
220 OUTPUT @Ps;"TRIG:ACQ:SOUR INT"
230 OUTPUT @Ps;"SENS:FUNC ""CURR"""
240 OUTPUT @Ps;"TRIG:ACQ:LEV:CURR .1"
250 OUTPUT @Ps;"TRIG:ACQ:SLOPE:CURR POS" ! Trigger on positive slope
260 OUTPUT @Ps;"TRIG:ACQ:HYST:CURR .05"
270 OUTPUT @Ps;"SENS:SWE:TINT 20E-6"
280 OUTPUT @Ps;"SENS:SWE:POIN 100"
in sweep
290 OUTPUT 705;"SENS:SWE:OFFS:POIN -20"
trigger
300 OUTPUT @Ps;"INIT:NAME ACQ"
310 !
to occur.
320 OUTPUT @Ps;"FETCH:ARRAY:CURR?"
completes.
330 !
340 ENTER @Ps;Curr_array(*)
350 PRINT Curr_array(*)
Example Programs - D
! Sets supply to default values
! Turn on power supply output
! Program power supply to 5 volts
! Set up electronic load to produce
! Set meter to ACDC
! High Current range
! Set to trigger on pulse
! Acquire current reading
! Trigger at 0.1 amps
! Set hysteresis of trigger
! Set sample time interval to 20us
! Set number of measurement samples
! Number of sample points before
! Initiate the trigger system.
Controller now waits for trigger
! Get the data after measurement
! Enters all 100 data points
! Print all data points
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