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Example: Making
Multiple Scans
The ARM:COUNt <number> command selects multiple scanning cycles for
switchboxes with non-downloaded scans. It does not apply when the
TRIGger:SOURce is DBUS or IMMediate.
Add the command before the
SCAN <channel_list> in the first program
example in this section. When the last channel in a channel list is closed,
the pointer is reset back to the beginning of the channel list. The next
trigger opens the last channel and closes the first one. This continues for the
specified number of cycles.
59 OUTPUT 70914;"ARM:COUN 10" !Enables 10 scanning cycles
60 OUTPUT 70914;"SCAN (@100:215)"!Sets scan list
80 FOR I = 1 TO 320
Example: Making
Continuous Scans
The INITiate:CONTinuous ON command selects continuous scanning cycles
(
INIT:CONT OFF disables continuous scanning cycles). Add the command
to the first program example in this section, as follows:
59 OUTPUT 70914;"INIT:CONT ON" !Enables continuous scanning
cycles
60 OUTPUT 70914;"SCAN (@100:215)"!Sets scan list
80 FOR I = 1 TO X !Set the number of measurements
desired
Comments Scanning consists of six steps:
• Connecting the multimeter to the switchbox
• Selecting the SCAN:MODE
• Selecting the SCAN:PORT
• Selecting the TRIGger:SOURce
• Specifying the SCAN <channel_list>
• Starting the scan (INIT or TRIG[:IMMediate])
Downloading a Scan List
The FET Multiplexer Module is primarily designed to be used as a
high-speed scanning switchbox or scanning voltmeter. To enable it to make
100,000 connections per second, the
SCAN <channel_list> scanning list is
downloaded into RAM on the module. This download takes place
automatically when you use
TRIGger:SOURce DBUS or TRIGger:SOURce
IMM
. For a multiple-module switchbox, the entire scanning list is
downloaded to each module. The channels are advanced to the next channel
in the channel list without any direct intervention by the mainframe CPU
during the scan.
The scan list is not downloaded for a switchbox or scanning voltmeter that
combines both FET and relay multiplexer modules, or for
TRIGger:SOURce BUS | EXT | HOLD. The channel closings are controlled
by the mainframe CPU. Also, the
ARM:COUNt <number> command does
not apply to downloaded scan lists. You can use
INITiate:CONTinuous ON
for continuous scanning with downloaded scan lists.
Chapter 3 Using the HP E1351A/53A FET Multiplexer Modules 39