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T H R E S H O L D
THRESHOLD
THRESHOLD (,.,,. (DATA entry) moves a lower boundary to the trace, similar to a base line clipper on direct-
writing CRT spectrum analyzers. The boundary's absolute amplitude level, in reference level units, is read out on
The THRESHOLD can be positioned anywhere within the graticule. It operates on TRACE m , m, or
for TRACES A, B, and C simultaneously. When activated after LINE power ON or 1'6::] , the THRESHOLD is
The THRESHOLD level does not influence the trace memory; that is, the threshold level is not a lower boundary
for trace information stored and output from the trace memories through the HP-IB. TH [ removes the
THRESHOLD boundary and readout from the CRT display but does not reset the position. If threshold is acti-
vated again before LINE power ON or I'd::] , it will resume at its last level.
The THRESHOLD readout has the same number of significant digits as reference level.
DATA Entry
66 Manual Operation
Moves the THRESHOLD about one division per rotation. The line moves in
Moves the THRESHOLD one-tenth of the total amplitude scale per step.
Positions the THRESHOLD to the exact entry level. Entry may be in mV,
SCALE AND REFERENCE LINE
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