Giga-tronics 8003, Operation Manual

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8003 Precision Scalar Analyzer
3-68 Manual 20791, Rev. C, June 2001
dBm. The resolution is 0.01 dBm. The format of the
returned data is
±
D.dd, where D is zero to three digits
and the assumed units are dBm.
Modifier name: LEVEL, LEVEL?, PL, PL?
Modifier Syntax 1: PL[?] [ hs numerical value]
numerical value range: Dependent upon the signal source if the source is
supported on the 8003’s private bus. If not supported
then the range is -99 to +99 dBm.
Modifier Syntax 2: PL hs on
State definition: OFF, ON
Modifier Description: This modifier defines a SWEEP TIME for the start/stop
swept frequency mode of signal source. The query flag
(‘?’) affixed to the sweep time modifier queries the value
of the sweep time. If set, the next time the 8003 is talk-
addressed it will output the value of the sweep time in
ms. The resolution is 1 ms. The resolution is 1 ms. The
format of the returned data is:
D where D is two to five digits
Modifier name: SWPT, SWPT?, ST, ST?
Modifier Syntax: PL[?] [ hs numerical value]
numerical value range: Dependent upon the signal source if the source is
supported on the 8003’s private bus. If not supported
then the range is 940 to 9000 ms.
Modifier Description: The update modifier decouples analyzer frequency
updates from sweeper frequency updates. This is most
commonly used when the analyzer and sweeper are set
to different frequencies, as in mixer or frequency
multiplier measurements. The analyzer normally uses
frequency information to change the operating frequen-
cies of the sweeper, annotate the x-axis of the swept
display, apply correct Cal Factors to the reading, take
the correct portions of trace memories and path cal
memories, and fix cursors and markers. The update
modifier allows independent control of the sweeper
frequencies and all other frequency related analyzer
functions. If the modifier UPD ON is included once with
the SWPF, SWPS, or FIXED verbs, then all subsequent
uses of those verbs will update the sweeper frequency
along with the analyzer frequency. If the modifier UPD
OFF is included once with the above verbs, then all
subsequent uses of those verbs will change only
analyzer frequency parameters.
Modifier name: UPD
Modifier syntax: UPD hs state
State definition: ON, OFF
Description: This verb places the signal source mode to center/span swept frequency. This is an instru-
ment wide command and, as such, has no channel or sensor specifiers. However there
are many parameters associated with the source mode. These are defined by the modifi-
ers which follow the verb.