Scanning Voltmeter Applications 61
Chapter 3
As required, set the E1411B multimeter to logical address 24 and the
E1476A multiplexer to logical address 25. Next, install the instruments in
the mainframe and connect the Analog Bus cable between the E1411B
multimeter and the E1476A multiplexer. Then, connect resistors and/or
Zero Ohm jumpers to desired channels (between 0 and 31) on the terminal
module.
Programming the
Scanning Voltmeter
When the configuration is complete, turn mainframe power ON and verify
that the "VOLTMETR" driver version A.06.00 is installed in the E1406
Command Module (see Exercise 1 in Chapter 1). If the appropriate
"VOLTMETR" driver is installed, run the following program.
This example scans 32 multiplexer channels and makes a measurement on
each channel. The measured readings are entered into the computer and
displayed after the scan. Table 3-3 shows how to modify the program to
make voltage, 2-Wire Ohms, 4-Wire Ohms, Thermocouple, and Thermistor
measurements.
NOTE
For the example program, when the multimeter buffer fills, measurements
are suspended until readings are read from the buffer (by the computer) to
make space available.
',05GJV
! Dimension array to store readings
&/($5
! Clear the scanning voltmeter
287387567
! Reset the scanning voltmeter
2873870($692/7'&"#
! Configure the multimeter for DC voltage
! measurements and specify channel list
! to scan (channels 00 through 31)
(17(55GJV
! Enter measured readings
35,175GJV
! Display measured readings
(1'
Table 3-3. Changes to Example Program
For This
Measurement:
Change Line 40 to:
Comments
Voltage
N/A
Line 40 performs a DCV measurement
2-Wire Ohms
40 OUTPUT 70903;"MEAS:RES? (@100:131)"
4-Wire Ohms
40 OUTPUT 70903;"MEAS:FRES? (@100:131)"
Channels 32 - 63 are automatically
paired with channels 00 - 31 for
4-wire measurements.
Thermocouple
Temperature
40 OUTPUT 70903; "MEAS:TEMP? TC,K,(@100:131)"
Type K thermocouple temperature
measurements.
Thermistor
Temperature
40 OUTPUT 70903;"MEAS:TEMP? FTH,5000,(@100:131)" 4-wire, 5000
Ω
thermistor temperature
measurements.
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Содержание E1476A
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