Tektronix 1705A - Manual (Page 103)

Checks and Adjustments
5- 8 1705A Spectrum Monitor
a. Adjust FOCUS, INTENSITY, SCALE, and SWEEP SPEED for a
useable display.
b. Place the 2 nd marker on the left edge of the graticule. See Figure 5-2.
ALIGN 2nd
MARKER HERE CHECK THAT 3rd
MARKER IS +/-- 1 MINOR
DIVISION FROM HERE
Left edge of
graticule
3rd major
graticule division
4th major
graticule division
Figure 5-2: Check time mark graticule alignment
c. CHECK -- for 10 frequency markers from beginning to end of sweep.
d. CHECK -- that each marker is within 1 minor Division of a major
graticule line when the 2 nd marker is on the left edge of the graticule
(see Figure 5-2).
5. Check 70 MHz SPAN/DIV and Readout
REQUIREMENT — One marker per 5 Divisions
±1 Division. Readout
accuracy: L--Band
±20 MHz. 70 MHz ±2 MHz.
a. Select 1 MHz SPAN/DIV.
b. Set the CENTER FREQUENCY to read 70 MHz.
c. Center the readout caret horizontally on screen.
d. CHECK -- for 1 marker every 5 major Divisions,
±1 major Division.
Readjust CENTER FREQUENCY, if necessary.
e. Repeat with Center Frequency at 50 MHz and 90 MHz.
f. Connect the leveled sine wave generator to the 70 MHz input without
the comb generator. See Figure 5-3.