Scanning with external instruments – Agilent Technologies L4400 User Manual
Page 93
Operating and Programming
3
L4400 User’s Guide
81
• The Monitor mode is automatically enabled on all channels that are
part of the active scan list. If you define the scan list after monitoring
has already been enabled, any channels that are not part of the active
scan list will be ignored during the monitor operation (no error is
generated).
• Mx+B scaling and alarm limits are applied to the selected channel
during a Monitor and all alarm data is stored in the alarm queue
(which will be cleared if power fails).
• You can monitor a digital input channel or totalizer channel even if
the channel is not part of the scan list. The count on a totalizer
channel is not reset when it is being monitored (the Monitor ignores
the totalizer reset mode).
The following command is used to enable the channel Monitor mode
(default):
ROUTe:MONitor:MODE CHAN
The following program segment selects the channel to be monitored
(single channel only) and enables the Monitor function.
ROUTE:MON:CHAN (@1003)
ROUTE:MON:CHAN:ENABLE ON,(@1003)
ROUTE:MON:STATE ON
To read the monitor data from the selected channel, send the following
command. Each reading is returned with measurement units, time stamp,
channel number, and alarm status information (see
page 79).
ROUTe:MONitor:DATA?
Scanning with External Instruments
Usage:
•
L4421A 40- Channel Armature Multiplexer
A common application of the the L4421A is to scan the multiplexer
channels using a “separate” instrument such as a DMM. The DMM can be
connected to the multiplexer’s COM terminals on its terminal block
(Figure 3- 13), or it can be connected and synchronized using the
multiplexer’s “Analog Busses” and “Ext Trig” ports.