1261B User Manual
Racal Instruments
Ó
1995
Using The Enhanced Monitoring System 4-5
Measuring Elapsed
Time
The 1261B EMS monitors three elapsed time attributes. These
are as follows:
·
Power-on Time
The number of seconds since the power switch was switched
from the OFF state to the ON state.
·
Cumulative Power-on Time
The total number of seconds which the power switch has been in
the ON state from the time the EMS was installed.
·
Filter Service Time
The total number of seconds which the power switch has been in
the ON state since the filter was last serviced (and the
“SENSE:TIME3:CLEAR” command was executed).
The following commands may be used to read the elapsed time
attributes:
MEAS:TIME1?
-- read power-on time
MEAS:TIME2?
-- read cumulative power-on time
MEAS:TIME3?
-- read power-on time since last
filter service
Each of these queries causes the 1261B EMS to reply with an
integer value. The unit of measure is seconds.
Reading The
Present State of
VXI Signals
The 1261B EMS has the capability to read the present state of
the VXI SYSFAIL*, ACFAIL*, and AS* (address strobe) lines.
The following commands may be used to read the present state
of each of these lines:
MEAS:VXI:ACFAIL?
-- read ACFAIL* line
MEAS:VXI:SYSFAIL?
-- read SYSFAIL* line
MEAS:VXI:ASTROBE?
-- read AS* line
Each of these queries causes the 1261B EMS to reply with a 1 if
the line is high, or a 0 if the line is low. Note that since each of
these lines is asserted when low, the normal reply should be “1".
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