370
!
Trigger the multimeter to start the measurements. Retrieve the readings
380
!
from multimeter memory and enter them into the controller. Since the
390
!
first channel in the scan list remains closed after the last multimeter
400
!
complete signal is received, transfer control to the user, open the channel,
410
!
and then transfer control to the multimeter.
420
OUTPUT 70903;"INIT"
430
OUTPUT 70903;"FETC?"
440
ENTER 70903;Rdgs(*)
450
OUTPUT 70900;"VXI:WRITE 25,4,8"
460
OUTPUT 70900;"VXI:WRITE 25,6,16"
470
OUTPUT 70900;"VXI:WRITE 25,4,0"
480
END
Comments
•
The multimeter is connected to the multiplexer using the analog bus
cable and the digital bus cable.
•
The analog bus carries the input signals to the multimeter. The
digital bus is used to carry a "multimeter complete" signal to the
multiplexer to trigger the next channel closing.
Because of the fast rate at which the FET channels close, the
multimeter is triggered once (
INIT
) and then samples continuously
(
SAMP:COUN 1600
). Thus, the multimeter ignores the multiplexer
"channel closed" signal on the digital bus.
Using this scanning multimeter configuration, the multimeter is able
to continuously scan the multiplexer channels and store readings in
its memory at a 76
µ
s (13 kHz) rate.
•
The maximum number of continuous scans and measurements
depends on the amount of multimeter memory available.
•
Detailed information on the FET multiplexer registers can be found
in the register-based programming section of the multiplexer user’s
manual.
Chapter 3
Using the HP E1326B/E1411B Multimeter 55
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