Output Status Byte Information Command
STAT Output status byte. This command will only be effective when SRQ is disabled. If it
is received while SRQ is enabled, a service request will be generated.
Typical Program Lines:
OUTPUT 704;STAT
ENTER 704;A$
PRINT A$
SRQ Related Commands
SRQE Enable SRQ
SRQD Disable SRQ
UNDD Disable SRQ only for under-range conditions. (Permits continuing data output
without undesired SRQ interference.)
UNDE Enable SRQ for under-range conditions.
Power Limits
The purpose of setting power limits is to alert the controller of two possibilities having occurred. These
are:
A. Over-range: Warns that the detector (or other component) may have been damaged, and data taken
may be invalid.
B. Under-range: Warns that the power level being measured is low and may be inaccurate.
The PPM can be enabled to generate an SRQ for under-range conditions. The point at which the PPM
sends an SRQ is determined by the MINP command. Data output during an under-range condition is as
follows:
Log Mode: -99.99dBm
Linear Mode: 0.000E-99
Over-range conditions always generate an SRQ (if SRQ is enabled), but normal data is still output. It
should be kept in mind that if the detector is exposed to power levels in excess of +23 dBm, not only will
the PPM’s measurement accuracy be degraded, but damage or complete destruction of the detector’s
diode element can occur.
The commands for setting power limits are:
MAXPsnn.nn Set power level (in dBm) for over-range condition.
s = polarity; n = dBm; +21.00 max, -10.00 min.
MINPsnn.nn Set power level (in dBm) for under-range condition.
s = polarity; n = dBm; -15.00 max, -50.00 min.
Series 8500A Peak Power Meters
3-16
Manual No. 20790, Rev C, November 1998
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