Program Examples
Publication 21555, Rev. E, September 2002
A-39
A.8.5
High Speed Measurement Example 5
The following program uses BURSt Mode for the fastest measurement rates possible. The maximum
measurement speed is performed when TRIG:DEL is set to 0. TRIG:DEL controls the speed of sampling
and data buffering. When TRIG:DEL is set to 0.004, samples will be taken every 4 milliseconds, on both
channels if connected, and stored in the meter’s internal data buffer. This speed does not control or
account for the meter’s internal data processing time after data acquisition or the speed of data transfer
to the controller. This second component of time, the time to get data from the 58542, is proportional
to the number of data points measured. Therefore, the example below uses only one channel and keeps
the number of points buffered to a minimum.
Both channels’ data will be taken at the same time during BURSt Mode. Power meter measurement
speed does not change when two sensors are connected versus only one sensor. However, the 58542
processing time and the time to transmit the data over the VXI and GPIB interfaces takes longer due to
the additional sensor data. If two sensors are connected, calibrated, and their respective channels are set
to ON, then read both arrays of data. Only read one array of data when one sensor is attached,
calibrated, and set to ON.
As shown in the examples, send the CALC#:MODE BURS command prior to sending the BURSt
Mode configuration commands TRIG:SOUR, TRIG:MODE, TRIG:COUN, and TRIG:DEL.
10
ALPHA ON
20
CLEAR SCREEN
30
!
40
OPTION BASE 1
50
DIM Id$[50],Err_msg$[70]
60
DIM Ques$[200],A$[80],Chan1sens_1(500)
70
DIM Chan2sens_2(500)
80
!
90
!
100
!########################################
110
! Instrument ADDRESS ALLOCATION
120
!
130
ASSIGN @Slot 0 TO 70100
! 70100 is Logical Address of the Slot 0 controller
140
ASSIGN @Pwr_mtr TO 70101
! 70101 is Power Meter in 1st position of slot 0
150
!###########################################
160
!
170
! Identify Attached Instruments
180
!
190
OUTPUT @Slot0;*IDN?
200
ENTER @Slot0;Id$
210
PRINT SLOT 0 is ;Id$
220
!
230
OUTPUT @Pwr_mtr;*IDN?
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ENTER @Pwr_mtr;Id$
250
PRINT SLOT 1 is ;Id$
260
WAIT 1
270
!
280
!
290
CLEAR @Pwr_mtr
300
WAIT 1
310
OUTPUT @Pwr_mtr;*CLS
! Clears old messages from SYST:ERR buffer
320
WAIT 0.3
330
OUTPUT @Pwr_mtr;CALC1:MODE NORM
! NORMal Mode to perform channel configuration
340
OUTPUT @Pwr_mtr;CALC1:POW 1
! Channels 1 or 2 can be either POW 1 or POW 2
350
! RAT and DIFF are illegal in SWIFt and BURSt Modes.
360
OUTPUT @Pwr_mtr;TRIG:SOUR IMM
! IMM set here to highlight conflict with BURSt operation
370
!
380
!#########################################
390
!
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