HP 82479A Owner's Manual page 207

=UE CHAMLISTCEL. BE
OATH SaSalalals xl
DATH 1s1als1414141
OATH Zayas dadada
FOR I= TO 29
READ COT
MEST 1
Bl=z © Bz=1 EB E=O
EHD SLE
Alternative Peripheral Options
saa ED
1 1 1 1a 1 I Slot 8
1 1 5 | 1 F S5lot 1
Sa ELE Slot 2
F.4 WORKING WITH SEVERAL HP 3421A INSTRUMENTS
The application programs in the Data Acquisition Pac (execpt = THTand WERE IFY) call CHAML IST
to set up the instrument buffer and read the channel types.
The HAML I=T subprogram as supplied in
UTILITY looks for the first HP 3421A on the first loop. Supplying the CHAML IST subprogram main
memory allows the use of an HP 3421A in other locations. The following example illustrates a
CHAML.T=T subprogram which will allow the application programs to use the third HP 3421A found on
the second loop as the primary instrument.
SUE CHAMLISTCBL.EBZ,COx.ED
OH ERROR GOTO FE 2 USEZ421 sHR2421020:2
FOR I=8 TO 29 B COId=CHAMTYFECTY ® HEST I
El=cCoSr=12+CC0120=1 0+0 22010
BE=iCeSo=20+ 001202 0+ 000 230=20
E=8 ® EMD
E=1 & EHD SUE
If more than one HP 3421A is in the system, a custom program may use the keywords to control the
second instrument as long as the instrument buffer is restored to the original instrument. This can be done
by preserving the location of the currently active instrument, assigning the second instrument to take the
measurements, and re-assigning the original instrument.
The following example, suitable for use by either STR IF or MIMI TOE, preserves the current HP 3421A
assignment and measures DC Volts on channel S of the second HP3421 on the loop:
Custom program header
Preserve current address
Use the second HP3421 on the loop
Measure DC Volts on channel §
Restore the original instrument
End
F-5