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OPERATION
3
-
31.
Frequency and Amplitude Adjustments
Adjust VERTICAL POSN to align the CRT
trace with the bottom graticule line.
Center the LO feedthrough
(i.e., the
"
signal
"
at
0 MHz) on the CRT with the TUNING control.
Narrow the FREQ
SPAN/DIV to 200 kHz.
Adjust the REF LEVEL FINE control as neces
-
sary to position the signal peak near the top
CRT graticule line.
Center the LO feedthrough again, if necessary,
and adjust the FREQ ZERO to calibrate the
FREQUENCY MHz readout at 00.0 MHz.
Set the FREQ
SPAN/DIV control to 1 MHz
and the REF LEVEL FINE control to
0.
Adjust the TUNING control for a FRE
-
QUENCY MHz readout of approximately 250
MHz.
Press the 10
dB/DIV Amplitude Scale push
button, and set the REFERENCE LEVEL con
-
trol to
-
20 dBm
(+
30 dBmV for Option 002
instruments).
MODEL 8559A
Connect the
250
MHz
CAL
OUTPUT
to the
spectrum analyzer input, and center the signal
on the CRT with the TUNING control. The
FREQUENCY MHz readout will indicate 250
MHz
-t
3
MHz.
Press the LIN Amplitude Scale push button.
Adjust the REF LEVEL FINE control to place
the signal peak at the top CRT graticule line.
Press the 10
dB/DIV Amplitude Scale push
button. Adjust VERTICAL GAIN to place the
signal peak at the top CRT graticule line.
Repeat steps
8
and
9
until the signal peak
remains at the top CRT graticule line when the
Amplitude Scale is alternated between 10 dB/
DIV and LIN.
Set the REF LEVEL FINE control to 0, and the
REFERENCE LEVEL control to
-
30 dBm
(
+
20 dBmV for Option 002 instruments).
Press the LIN Amplitude Scale push button,
and adjust REF LEVEL CAL to place the sig
-
nal peak at the top CRT graticule line.