Checks and Adjustments
5-10 1705A Spectrum Monitor
6. Check Resolution Filter
REQUIREMENT-- 300 kHz Filter Resolution 200 --400 kHz. 10 kHz
Filter Resolution 20 kHz or less. Filterthrough gain matches ±2dB.
a. Adjust the leveled sine wave generatorAmplitude for a 5 Division signal
amplitude.
b. CHECK -- that themarker width 0.6 Divisions down from the top of the
signal is 3 Divisions, ±1 Division.
c. Changeresolutionto10kHz.
d. Set SWEEP SPEED fully counterclockwise.
e. CHECK --that the marker width 0.6 Divisions down from the top of the
signal is ≤2 minor Divisions.
f. CHE CK -- that the 10 kHz marker amplitude matches the highest point
of the 300 kHz marker amplitudewithin 1minor Division, when
switching between300 KHZ and 10 KHZ RES OLUTION.
7. Check 70 MHzGain an d Flatness
REQUIREMENT-- Incremental Amplitude Accuracy ±4dB/70MHz.
Flatness±1 minor Division from 70 MHz to either 50 or 90 MHz.
a. Set SPAN/DIVto FULL.
b. Set RESOLUTION to 300 kHz.
c. Set SWEEP SPEED fully clockwise.
d. Set the leveledsine wave generator Frequency to 70 MHz, the Ampli-
tude Multiplier to X1, and theAmplitude to 0.5 ( --2 dBm).
e. CHECK --for a marker amplitude change of 2 Divisions, ±2 minor
Divisions when switching the leveledsine wave generator Amplitude
Multiplier between0.01 and 0.1 (a 20 dB change).
f. Set the leveled sine wave generatorAmplitude Multiplier to 0.01 and
Amplitude to 0.5 (--42dBm).
g. Position the tip of the markerto exact crt center with the HORIZONTAL
and VERTICAL POSITION controls.
h. Set the leveledsine wave generator Frequency to 50 MHz.
i. CHE CK -- that the tip of the marker is on the crt center line, ±1 minor
Division (vertically).
j. Set the leveledsine wave generator Frequency to 90 MHz.