Keysight E1412A, User'S Manual And Scpi Programming Manual, Page: 72 / 243

lxxii Keysight E1412A Digital Multimeter User Guide
Keysight E1412A Multimeter Application Information E1412A Multimeter Application Examples
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This example uses the READ? command. Measurements are initiated with
the READ? command which puts the multimeter in the wait-for- trigger
state. Measurement occurs when the trigger arrives and readings are
subsequently stored directly in the output buffer and must be retrieved by
the computer with an I/O construct you supply. An alternative way of
initiating measurements is to use the
INITiate command as done in the
previous example. Measurements are made and stored in the multimeter's
internal memory and must be retrieved using the
FETCh? command which
transfers the readings to the output buffer. You must be careful when using
the
INITiate and FETCh? commands. Internal memory stores a maximum of
512 readings; the oldest readings exceeding 512 are lost.
Synchronizing the Multimeter With a Switch Module
This program example demonstrates how to synchronize the multimeter with a
switch module. For the E1412A it uses the TTL triggers from the VXI backplane to
trigger the multimeter and advance the channel scan list. The example uses the
E1476A 64-Channel Multiplexer Module but will also work with any switch
module as long as the channel list is specified properly. Figure 2-2 illustrates the
C-size set up. The switch module (multiplexer) and multimeter use the VXI
backplane to communicate the trigger and VM Complete signals to each other to
synchronize the scan.
Figure 2-2 E1412A Multimeter and Switch Module Synchronization