Example Programs - D

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

20OPTION BASE 1

30DIM Curr_array(100)

40!

50ASSIGN @Ps TO 705

60ASSIGN @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

 

 

130OUTPUT @Ld;"CURR:TLEVEL 3"

140!

150OUTPUT @Ld;"TRAN:FREQ 1000"

160OUTPUT @Ld;"TRAN:DCYCLE 10"

170OUTPUT @Ld;"TRAN:MODE CONT"

180OUTPUT @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

250OUTPUT @Ps;"TRIG:ACQ:SLOPE:CURR POS" ! Trigger on positive slope

260OUTPUT @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

 

 

 

 

290OUTPUT 705;"SENS:SWE:OFFS:POIN -20" ! Number of sample points before trigger

300

OUTPUT @Ps;"INIT:NAME ACQ"

! Initiate the trigger system.

310

!

Controller now

waits for trigger

to occur.

 

 

320

OUTPUT @Ps;"FETCH:ARRAY:CURR?"

! Get the data after measurement

completes.

 

 

330

!

 

 

340

ENTER @Ps;Curr_array(*)

! Enters all 100

data points

350

PRINT Curr_array(*)

! Print all data

points

169

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Agilent Technologies 66311B, D, 66309B, 66111A manual Example 3. Current Pulse Measurement Using Basic, 169
Page 168 Page 170

66111A, 66309B, 66311B, D specifications

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