58542 VXIbus Universal Power Meter
A-26
Publication 21555, Rev. E, September 2002
A.5.6
TRIGgering Example 6
Be careful when using BURSt Mode. For example, the user must use INIT:CONT ON; the user does not
have manual control of trigger arming sequence using INIT, as the user do using the FETCh#? command
with the NORMal Mode. This is of particular concern using TTL level triggering on either the front
panel EXT connector or the VXI backplane TTLT trigger functions. The user must control the
triggering through control of the trigger source. The user must use INIT:CONT ON in BURSt Mode;
using INIT control arming of the trigger sequence is not allowed.
The following example uses EXTernal TTL level triggering using the external trigger input on the front
panel of the 58542 VXI Universal Power Meter. Twenty readings are stored in the measurement buffer.
Then FETCh#? is used during SWIFt Mode. Please note there is a TTL level hardware handshake
capability using the ANALOG OUT BNC connector which is also on the front panel. The Analog
BNC will output a high (5V) when the instrument is ready for triggering. After a trigger is received, the
Analog BNC output goes low (0V).
TRIG:SOUR HOLD halts the SWIFt Mode triggering sequence.
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(20)
70
DIM Chan2sens_2(20)
80
!
90
!
100
!#########################################
110
! Instrument ADDRESS ALLOCATION
120
!
130
ASSIGN @Slot0 TO 70100
! 70100 is Logical Address of the Slot 0 controller
140
ASSIGN @Pwr_mtr TO 70101
! 70101 is Power Meter, in 1st position right of slot 0
150
!##########################################
160
!
170
!
180
CLEAR @Pwr_mtr
190
WAIT 1
200
OUTPUT @Pwr_mtr;*CLS
! Clears old messages from SYST:ERR buffer
210
WAIT 0.3
220
OUTPUT @Pwr_mtr;CALC1:MODE NORM
! NORMal Mode to perform channel configuration
230
OUTPUT @Pwr_mtr;CALC1:POW 1
! Channels 1 or 2 can be either POW 1 or POW 2
240
! RATio and DIFFerence configurations are illegal in
! SWIFt and BURSt Modes.
250
!
260
!###########################################
270
!
280
! Entering SWIFt Mode
290
!
300
OUTPUT @Pwr_mtr;CALC1:MODE SWIF
! Enters SWIFt Mode for fastest individual data point
! triggered measurements.
310
!
320
OUTPUT @Pwr_mtr;SENS1:CORR:FREQ 2.22E8
! Applies Cal Factor in SWIFt mode
330
! Can be sent before or after CALC#:MODE SWIF
340
!
350
OUTPUT @Pwr_mtr;TRIG:SOUR EXT
! TTL level triggering, Each trigger acquires one data
! point in SWIFt Mode.
360
! Can be sent before or after CALC#:MODE SWIF
370
!
380
OUTPUT @Pwr_mtr;TRIG:COUN 20
! Stores 20 points for simultaneous output using
! FETCh#?.
390
! Must be sent after CALC#:MODE SWIF
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