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Checks and Adjustments
5-4
1705A Spectrum Monitor
6. Check Resolution Filter
b. CHECK -- that the marker width 0.6 Divisions down from the top is
3 Divisions, ±1 Division.
e. CHECK -- that the marker width 0.6 Divisions down from the top of the
signal is ≤2 minor Divisions.
f. CHECK -- that the 10 kHz marker amplitude matches the highest point
of the 300 kHz marker amplitude within 1 minor Division.
7. Check 70 MHz Gain and Flatness
e. CHECK -- for a marker amplitude change of 2 Divisions, ±2 minor
Divisions when switching the leveled sine wave generator Amplitude
Multiplier between .01 and 0.1 (a 20 dB change).
i. CHECK -- that the tip of the marker is on the crt center line, ±1 minor
Division (vertically).
8. Check Video Filter
d. CHECK -- that the baseline noise amplitude drops approximately 50%
when the VIDEO FILTER is ON.
9. Check Sweep Speed
b. CHECK -- for a solid trace with almost no flicker.
d. CHECK -- for approximately 3 to 4 sweeps per second.
Alternate Method
e. CHECK -- for a ramp duration of 20 ms ±10 ms.
h. CHECK -- for a ramp duration of 200 ms ±100 ms.
10. Check L--Band Linearity
e. CHECK -- for 10 frequency markers.
f. CHECK -- that each marker is within 1 minor Division of a major
graticule line.
11. Check L--Band SPAN/DIV and Readout
d. CHECK -- for 1 marker every 5 Divisions, ±1 Division.
i. CHECK -- for 1 marker every 5 Divisions, ±1 Division.
o. CHECK -- that the marker is intensified.
q. CHECK -- that the marker is on screen.