Adjustment Procedures
2715 Spectrum Analyzer Service Manual 5-25
d. Adjust R431 on the Log board for a DC level of 20 mV ±2mVatTP9.
e. Adjust R500 on the Log board to position the trace atthe bottom
graticule line.
f. Reconnect the 10 MHz/--10 dBm signal to J190 on the Log board
through the 10 dB and 1 dB Step Attenuators. Set the attenuatorsfor
0 dB attenuation (no external attenuation).
g. Adjust R526 on the Log board to position the trace atthe top graticule
line.
h. Repeat parts (3) through (7)until both top of screen and bottom of
screen alignment are satisfied.
i. Add 6 dB of attenuation to the input signal.
j. Check that the trace is within 2 minordivisions of the fourth graticule
line from top of screen.
k. Add another 6 dB of attenuation to the input signal.
l. Check that the trace is within 2 minordivisions of the sixth graticule line
from top of screen.
m. Add another 6 dB of attenuation to the input signal.
n. Check that the trace is within 2 minordivisions of the seventh graticule
line from top of screen.
5. Adjust RF Gain (R200 on the RF Mother board, R170 on the Reference
Oscillator board) as follows:
a. Recall factory default power up settings by pressing UTlL 1 1.
b. Select the following settings on the Spectrum Analyzer:
FREQUENCY 100 MHz
SPAN/DIV 2 MHz
REFERENCE LEVEL --30 dB m
RESOLUTION BW 5 MHz
VIDEO FILTER On
VERT SCALE LIN
c. Connect a 100 MHz signal to the RF INPUT as follows:
HAll instruments except Optio n 50 - Connect a 50 -- 75 Ωmin loss
pad to the Power Meter powerhead. Connect the min loss pad to the
Signal Generator input. Set the amplitude of a 100 MHz signal from
the Signal Generator and cable combinat ion to -- 30.2 dBm, then
connect the 100 MHz signal to the RF INPUT.