Giga-tronics 8003, Operation Manual

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8003 Precision Scalar Analyzer
2-76 Manual 20791, Rev. C, June 2001
2.9.1.1 Using Channels
The analyzer can display up to four channels simultaneously.
The display on each channel is completely user determined and independent of the number of sensors
and/or bridges being used. For example, all four channels display power readings from the same single
sensor. This might be particularly useful if the scale factors were different for each of the four channels
so that different characteristics of the same trace (such as filter skirts and pass band ripple) could be
highlighted. Actually, each channel can display a user-defined mathematical relationship, such as the
ratio of the power readings from two sensors minus the stored path calibration. To define this
relationship, you must choose a channel button, press the
[DEFINE]
key, and choose between single
sensor measurements, or the ratio or difference between any two sensors. By pressing
[MEAS]
, you can
also choose to subtract path cal and/or stored trace data from the measurement.
The channel selection buttons have the secondary function of selecting the Active Entry channel. This
is indicated by an LED that lights next to the selected channel as well as a box drawn around the
channel summary area at the top of the screen. The Active Entry channel is the one that is modified by
any of the analyzer function keys (such as scale factor or cursor keys).
Figure 2-30: More Accurate Insertion Loss Ratioing Meas. (Back-to-Back Adpts.
Improving Source Match)
CURSOR
ON/OFF
∆
SEARCH
CURSOR
ON/OFF
CURSOR
FREQ
CURSOR
RETURN
STRT 2.000 GHz
STOP
CRSR -0.14 dB
7.055 GHz
CH1: SW C -PC CRSR -0.19 dB
0.1 dB/ REF -0.00 dB
CH2: C/A -PC CRSR -0.14 dB
0.1 dB/ REF 0.00 dB
7.500 GHz
CURSOR ->
MRKR N
DEFINE
MRKR N
REF ->
CURSOR
1
2
CRSR 7.055 GHz