2.
306
With zero signal into the bridge bring the ground level
recorder to zero by adjusting R=-3 (See Fig. 16)
Calibration
The calibration of the telepulse coding unit should be done in
the following order: 1) bridge, 2) converter, 3) comparator.
Figure
16 shows the positions of the controls.
30601
Bridge:
1.
With zero input, the bridge is balanced (R-3) to produce
a zero reading on the recorder.
2.
A negative one volt signal is applied to the input and
the sensitivity control (R=-5) adjusted for full scele on
the recorders
3.
The marker push button is closed and the recorder
brought to full scale by adjusting R-9.
lh.
The duration of the marker is set by adjusting timer
T-1,
3.6.2
The minimum period should be five seconds.
Converter:
1.
With zero signal input, the bias of V=3 is adjusted to
-1.45 volts.
The amplitude of the converter output
pulses, appearing across R-10, should be approximately
16 volta.
2.
With 1.4 volts applied to the input of V-3, the amplitude
of the pulses across R-10 should be approximately 30 volts.
3.603
Comparator:
1.
Resistor 2-5 in the comparator unit is adjusted so
that the univibrator (V~-13) is triggered reliably by
ten volt input pulses.
@ 35