Scanning A Range Of Switchbox Channels - HP E1343A User Manual

Scanning a Range of Switchbox Channels

Example: Making Voltage
Measurements by
Scanning
36 Using the Relay Multiplexer Modules
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•
You can scan a range of channels of a switchbox consisting of single or
multiple multiplexer modules (see the "Comments" section for
scanning requirements of a switchbox).
•
Scanning involves sequentially closing each channel on a range of
specified channels.
•
During scanning, the relay which was previously closed opens before
the next relay closes.
Figure 3-4, Figure 3-5, and the following commands, show how to make
voltage measurements by performing a single scanning cycle of all channels
on two multiplexer modules in a single switchbox. In the example, the:
-- AT Tree Switch Terminals of each terminal module connect to each
other and to the multimeter in
Switch Terminals to each other, use either the Analog Bus Cables;
Analog Bus (shown in
together between each terminal modules.
-- HP E1300/E1301 Mainframe's "Trig Out" pulse synchronizes the
switchbox with the multimeter.
-- HP-IB Bus trigger command advances the switchbox channel list.
-- Multimeter HP-IB select code is 7 and primary address is 22.
-- Switchbox HP-IB select code is 7, the HP-IB primary address is 09,
and the HP-IB secondary address is 14.
-- Computer is an HP Series 200/300 Computer with HP BASIC using
HP-IB.
Enter and Execute:
10 OUTPUT 722;"TRIG EXT;DC 10"
20 OUTPUT 70914;"OUTP ON"
30 OUTPUT 70914;"TRIG:SOUR BUS"
40 OUTPUT 70914;"SCAN:MODE VOLT"
50 OUTPUT 70914;"SCAN:PORT ABUS"
60 OUTPUT 70914;"SCAN (@100:215)"
70 OUTPUT 70914;"INIT"
80 FOR I=1 TO 32
90 ENTER 722;A
100 PRINT A
110 TRIGGER 70914
120 NEXT I
130 END
Figure 3-5; to connect the AT Tree
Figure 2-2 on page 22) or wire the terminals
!Sets multimeter to external
triggers and to measure dc volts.
!Enables "Trig Out" port.
!Sets switchbox to receive Bus
triggers.
!Setup switchbox to measure
voltage.
!Closes the appropriate Tree
Switches while scanning;
automatically makes connection
to the Analog Bus.
!Selects channel list. 100 selects
first channel of module #1;
215 selects last channel of
module #2.
!Starts scanning cycle.
!Start count loop.
!Enter reading into variable A.
!Print reading in variable A.
!Trigger the switchbox to
advance the scan list.
!Increment count.
Chapter 3