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Example: Scanning
with External
Instruments
This example uses the mainframe "Trig Out" port to synchronize the
multiplexers to an HP 3457A Digital Multimeter. See the following figure
for typical connections. For this example, use the trigger output pulse of the
mainframe "Trig Out" port to trigger the multimeter from its "External
Trigger" port.
The sequence of operation is:
1.
INIT (line 70) closes channel number 100.
2. The channel closure causes a trigger output from the "Trig Out" port.
3. The trigger causes the multimeter to make a measurement.
4. Measurement result is sent to the computer (lines 80 to 100).
5.
TRIGGER command (line 110) advances the channel list to the next
channel.
6. Steps 2-5 are repeated for channels 101 through 115.
10 OUTPUT 722;"TRIG EXT;DCV" !Sets multimeter to external trigger
and to measure dc volts
20 OUTPUT 70914;"OUTP ON" !Enables "Trig Out" port
30 OUTPUT 70914;"TRIG:SOUR BUS" !Sets switchbox to receive bus
triggers
40 OUTPUT 70914;"SCAN:MODE VOLT"!Sets switchbox to measure
voltage
50 OUTPUT 70914;"SCAN:PORT ABUS"!Closes the tree isolation switches
60 OUTPUT 70914;"SCAN (@100:115)"!Selects the channel list for
scanning
70 OUTPUT 70914;"INIT" !Starts scanning cycle
80 FOR I = 1 TO 16 !Start count loop
90 ENTER 722;A !Enter reading into variable A
100 PRINT A !Print reading in variable A
110 TRIGGER 70914 !Trigger the switchbox to advance
the channel list
120 NEXT I !Increment count
130 END
48 Understanding the HP E1351A/53A FET Multiplexer Modules Chapter 4