Manual - 8500A Series Peak Power Meter - Giga-tronics
Manual - 8500A Series Peak Power Meter - Giga-tronics
Manual - 8500A Series Peak Power Meter - Giga-tronics
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<strong>Series</strong> <strong>8500A</strong> <strong>Peak</strong> <strong>Power</strong> <strong>Meter</strong>s<br />
Output Status Byte Information Command<br />
STAT<br />
Typical Program Lines:<br />
OUTPUT 704;STAT<br />
ENTER 704;A$<br />
PRINT A$<br />
SRQ Related Commands<br />
Output status byte. This command will only be effective when SRQ is disabled. If it<br />
is received while SRQ is enabled, a service request will be generated.<br />
SRQE<br />
SRQD<br />
UNDD<br />
UNDE<br />
Enable SRQ<br />
Disable SRQ<br />
Disable SRQ only for under-range conditions. (Permits continuing data output<br />
without undesired SRQ interference.)<br />
Enable SRQ for under-range conditions.<br />
<strong>Power</strong> Limits<br />
The purpose of setting power limits is to alert the controller of two possibilities having occurred. These<br />
are:<br />
A. Over-range: Warns that the detector (or other component) may have been damaged, and data taken<br />
may be invalid.<br />
B. Under-range: Warns that the power level being measured is low and may be inaccurate.<br />
The PPM can be enabled to generate an SRQ for under-range conditions. The point at which the PPM<br />
sends an SRQ is determined by the MINP command. Data output during an under-range condition is as<br />
follows:<br />
Log Mode: -99.99dBm<br />
Linear Mode: 0.000E-99<br />
Over-range conditions always generate an SRQ (if SRQ is enabled), but normal data is still output. It<br />
should be kept in mind that if the detector is exposed to power levels in excess of +23 dBm, not only will<br />
the PPM’s measurement accuracy be degraded, but damage or complete destruction of the detector’s<br />
diode element can occur.<br />
The commands for setting power limits are:<br />
MAXPsnn.nn<br />
MINPsnn.nn<br />
Set power level (in dBm) for over-range condition.<br />
s = polarity; n = dBm; +21.00 max, -10.00 min.<br />
Set power level (in dBm) for under-range condition.<br />
s = polarity; n = dBm; -15.00 max, -50.00 min.<br />
3-16 <strong>Manual</strong> No. 20790, Rev C, November 1998<br />
Superceded by Revision D, March 2009
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