Controls, Indicators and Displays Summary
38
+15Vdc
---.--~GND
-12.6Vdc
Model
8754A
RECEIVER
LEFT
SIDE
CRT
STABILITY.
Adjust
to
eliminate
jitter
in horizontal position
of
receiver relock points. Relock points
may
occur in sweeps > 2 octaves wide.
Scale/Division. Select
scalel
division for rectangular display.
LENGTH.· Used
to
add
equivalent electrical length
of
approximately 0 to 160
mm
to
the reference
channel in
POLAR
AIR
phase measurements
and
PHASE
B/R
phase measurements. These controls
are
independent.
PROBE POWER.
Each
provides regulated power for operating active probes such as the -Model
1121 A AC·Probe. Voltages supplied are +
15
Vdc and
-12.6
Vdc.
Receiver Inputs.
The
receiver requires a signal
at
the R
input
between 0
and
- 40 dBm
to
maintain
phase lock.
The
UNLOCKED
indicator lights
to
indicate low R channel
input
level. A
and
B inputs
are
full range test inputs, specified
from
0 dBm
to
- 80 dBm.
Measurement Select. Press
to
select the measurement.
POLAR
AIR
uses
CHANNEL
1 for
polar
magnitude
and
CHANNEL
2 for
polar
phase angle. R, A,
and
B select power in dBm
at
the R, A,
or
B
input
(OFFSET
not
engaged). NOTE: To select
R,
press
Channell
and 2 OFF.
A/R
and
B/R
select
magnitude ratio in dB between
the
A
or
Band
R input. PHASE
B/R
displays
the
phase relationship in
degrees between
Band
R inputs. Pressing POLAR
A/R
overrides any
other
measurement selection.
CHANNEL
1 and
CHANNEL
2 REFERENCE.
Calibrated
lever-activated offset c.ontrols, in-
dependent for each channel, which display the value
of
the reference position in dB, dBm,
or
degrees.
The
range
of
th'ese controls
is
± 199.
OFFSET.
The
vernier
is
used in calibration
to
move the reference trace
t(}
the reference position.
With
the associated
button
in the detent position this offset
is
applied to the measurement; with the
button
released the offset
is
not
applied.
The
OFFSET
verniers are independent for
CHANNEL
1
and
CHANNEL 2 and provides
about
±80 dB range for magnitude calibration and
about
±20 degrees
range for phase calibration.
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