play linearity must remain within listed specifications of
Table 5-2 to the + and - 25 MHz positions.
g. Center the coarse IF CENTER FREQ control. Set the
DISPERSION control to 1 MHz position and apply 10 ns and
1 µs markers from the Time-Mark Generator.
h. Check-The range of the IF CENTER FREQ-FINE con-
trol. Must equal or exceed + and - 1 MHz.
i. Return the VERTICAL DISPLAY switch to LIN position.
Fig. 5-2. Measuring dispersion accuracy.
Fig. 5-3. Measuring dispersion linearity.
13. Check Resolution Bandwidth
a. Requirement-Resolution bandwidth is equal to or less
than 1 kHz, to 100 kHz or more.
b. Apply 200 MHz (5 ns) signal from the Time-Mark Gen-
erator to band B RF INPUT connector through 20 dB attenu-
ator. Tune CENTER FREQUENCY control to minimize inter-
ference of the converted signals (tunable signals).
c. Set the DISPERSION RANGE to kHz/DIV position and
the DISPERSION to 50 kHz/div. Uncouple the RESOLU-
TION and turn the control fully clockwise. Set the TIME/
DW to .1 s.
d. Adjust the GAIN control for an 8 division display
amplitude.
e. Check the bandwidth of the 200 MHz signal at the
-6 dB amplitude point by switching in -6 dB attenuation
with the IF ATTENUATOR switches and noting the -6 dB
amplitude point. Bandwidth must equal or exceed 100 kHz.
See Fig. 5-4A.
f. Change the RESOLUTION control to 1 kHz position
(fully counterclockwise) and the DISPERSION to 1 kHz/div
keeping the 200 MHz signal centered on screen with the
IF CENTER FREQ controls.
g. Check the resolution bandwidth at the -6 dB ampli-
tude point, Bandwidth must not exceed 1 kHz. See Fig. 5-4B.
h. Return the RESOLUTION to the coupled position and
set the DISPERSION-COUPLED RESOLUTION controls to
500 kHz/div position.
5-5
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