3 Features and Functions
182 Keysight 34980A Mainframe User’s Guide
– Each time you start a new scan, the instrument clears all readings (including
alarm data) stored in reading memory from the previous scan. However, alarm
data stored in the alarm queue from the digital modules is not cleared.
Therefore, although the contents of reading memory are always from the most
recent scan, the alarm queue may contain data that occurred during previous
scans or while the instrument was not scanning.
Front Panel Operation:
– To configure an alarm on a digital input channel, choose from the following
items and then set the desired patterns for the compare data and mask. Set
each bit to “0” or “1”.
Alarm > COMPARE DATA > COMPARE MASK
– You can either specify that an alarm will occur when certain bits change or
when a specific pattern is read:
Alarm > COMPARE FOR > EQUAL|NOT-EQ
– To configure an alarm on a specific totalizer count, select:
Alarm > TOTALIZER LIMIT
Remote Interface Operation (Digital Input):
To assign the alarm number to
report any alarm conditions on the specified digital input channels,
use the following command.
OUTPut:ALARm[1|2|3|4]:SOURce (@<ch_list>)
To configure alarms on the specified digital input channel, use the following
commands (also see the example on the following page).
CALCulate
:COMPare:TYPE {EQUal|NEQual},(@<ch_list>)
:COMPare:DATA <data>,(@<ch_list>)
:COMPare:MASK <mask>,(@<ch_list>)
Select EQUal to generate an alarm when the data read from the port is equal to
CALC:COMP:DATA after being masked by CALC:COMP:MASK. Select NEQual (not
equal) to generate an alarm when the data read from the port is not equal to
CALC:COMP:DATA after being masked by CALC:COMP:MASK.
Use CALC:COMP:MASK to designate the “don’t care” bits. Bits that you set to “0” in
the mask are ignored. To enable the specified alarm mode, send the following
command.
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