Manual - 8500A Series Peak Power Meter - Giga-tronics

Series 8500A Peak Power Meters
The procedure to trigger reset the PPM with the GET command consists of the following steps:
1. Listen-address the PPM.
2. Send the GET universal command.
3. Talk-address the PPM.
4. Release ATN to set the PPM in TACS.
If in the Peak Mode, send the pulse to trigger the PPM.
If the pulse is sent before the PPM is in TACS, an SRQ will be generated if SRQ has been
enabled. Entering TACS will clear the SRQ.
5. Read the power measurement string as it is sent by the PPM. The string will be terminated with a
carriage return followed by a line feed character sent with EOI.
The procedure to trigger reset the PPM with the UPDN command is the same as using the universal GET
command except that after Step 1 when the PPM has been listen-addressed, the command string UPDN
should be sent. The power measurement data output format is discussed in Section 3.2.7.
Sample Program:
10 PRINT CHR$(12);
20 ! THIS PROGRAM USES THE
30 ! UPDATE TRIGGER RESET MODE
40 ! OF THE PPM TO COLLECT
50 ! POWER MEASUREMENT DATA.
60 ! UPDN RESETS THE PPM. IT
65 ! IS THEN READY OR ARMED.
70 ! THE PPM WILL SEND DATA
80 ! AFTER RECEIVING THE UPDN
90 ! COMMAND.
100 !
110 ! DATA ENTERED AS A STRING
120 ! D$ IS DISPLAYED, AND THEN
130 ! REPEATED CONTINUOUSLY.
140 !
150 OUTPUT 704; UPDT
160 OUTPUT 704; UPDN
170 ENTER 704;D$
180 DISP D$
190 GO TO 160
200 END
☛ NOTE: In the Dual Channel Mode, it is necessary to read the IEEE Bus twice to get A and
B channel data.
3-6 Manual No. 20790, Rev C, November 1998
Superceded by Revision D, March 2009