Program Examples
Publication 21555, Rev. E, September 2002
A-37
A.8.3
High Speed Measurement Example 3
Using the same system configuration, the previous program achieved a speed of 25 readings per second
per channel. With faster systems using embedded PCs and faster software, measurement speeds have
been recorded as high as 71 readings per second.
The following program shows fast BUS triggering in the SWIFt Mode. TRIG (or *TRG) is used to
acquire data, and FETCh#? processes and outputs the data to the slot 0 controller/resource manager.
This program does not use the meter’s data buffering capability.
170
ASSIGN @Pwr_mtr to 70101
180
CLEAR @Pwr_mtr
190
WAIT 1
200
OUTPUT @Pwr_mtr;*CLS
! Clears old messages from SYST:ERR buffer
205
WAIT 0.3
210
PRINT Running...
220
!
230
OUTPUT @Pwr_mtr;CALC1:MODE NORM
! NORMal Mode to perform channel configuration
240
OUTPUT @Pwr_mtr;CALC1:POW 1
! Channels 1 or 2 can be either POW 1 or POW 2
250
! RAT and DIFF are illegal in SWIFt and BURSt Modes.
260
!
270
!#############################################
280
!
290
! Entering SWIFt Mode
300
!
310
OUTPUT @Pwr_mtr;CALC1:MODE SWIF
! Enters SWIFt Mode for fastest individual data point
! triggered measurements.
320
!
330
OUTPUT @Pwr_mtr;SENS1:CORR:FREQ 1.44E9
! Applies Cal Factor in SWIFt mode
340
! Can be sent before or after CALC#:MODE SWIF
350
!
360
OUTPUT @Pwr_mtr;TRIG:SOUR BUS
! BUS or EXT triggering is slower than IMM
370
! Can be sent before or after CALC#:MODE SWIF
380
!
390
FOR I=1 TO 10
400
FOR K=1 TO 20
410
OUTPUT @Pwr_mtr;TRIG
! TRIG is the SCPI Bus trigger. Can also use *TRG
420
OUTPUT @Pwr_mtr;FETC1?
! FETC#? acquires data
430
ENTER @Pwr_mtr;Chan1sens_1(K)
440
!ENTER @Pwr_mtr;Chan1sens_1(K),Chan2sens_2(K)
! Use this line when two sensors are attached.
450
NEXT K
460
!
470
PRINT Chan1sens_1(*)
480
!PRINT Chan1sens_1(*),Chan2sens_2(*)
! Use this line when two sensors are attached.
490
PRINT “”
500
NEXT I
510
!
520
END
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