Tektronix 1L10, Инструкция по эксплуатации

Страница: 33 / 72

Maintenance and Calibration— Type 1 LI 0
Fig. 4 -2 4 . Equipment setup for gain compensation adjustment.
c. On the Harmonic Modulator Unit, set the 60 me TRAP
switch to out.
d. Set the G A IN control of the Type 1 LI 0 for about six
centimeters of displayed signal.
e. Set the output frequency o f the Type 105 Square-Wave
Generator to about 2 kc and adjust its output amplitude so
that the modulation markers are clearly visible.
Fig. 4 -2 5 . Initial display for gain compensation.
f. Set the output frequency of the Type 105 so that the
first modulation marker on the left-hand side o f the center
frequency is at the graticule centerline (see Fig. 4-25).
g. Set the DISPERSION-KC/CM and COUPLED RESOLU­
TIO N switches to 1, .5, .2, .1, .05, .02 and .01 while keeping
the modulation marker centered on the screen by varying
the output frequency o f the Type 105 Square-Wave Gen­
erator.
h. Set the sweep rate o f the oscilloscope to .2SEC/CM.
i. Adjust C564 and C544 fo r the same displayed signal
amplitude in the .1 KC/CM and 2 K C /C M settings o f the
DISPERSION-KC/CM switch.
1564 C554 C544
4 -1 7
Fig. 4 -2 6 . Location of gain compensating adjustments.