Tektronix 1730 Series, Instruction Manual

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1730–Series Checks and Adjustments
5–17
h. CHECK – Turn on the 1730–Series VARIABLE gain (X5 is off) and
adjust the VARIABLE control for a sync pulse amplitude greater than
100 IRE (720 mV for PAL).
i. CHECK – Adjust the 1730–Series VARIABLE control for a display
amplitude of 140 IRE (1.0 V for PAL) or less.
j. Turn off 1730–Series VAR GAIN.
k. Terminate the CH–B loop–through with a 75
W
termination.
l. Use the VERTICAL Position control to place the signal blanking level
on the baseline.
m. Select X5 GAIN.
n. CHECK – for less than 1 major division of baseline shift when
switching between X1 (Gain off) and X5 GAIN.
o. Turn off X5 GAIN.
p. Connect the VAC to the CH–B INPUT. Do not terminate the loop–
through.
q. Set the VAC for a 999.9 mV square wave.
r. CHECK – that the vertical amplitude of the display of the 1730–Series
is 138.6 to 141.4 IRE (0.990 V to 1.010 V).
s. Disconnect the VAC from the 1730–Series.
10. Check Calibrator Amplitude
REQUIREMENT – Amplitude 1 V
±
1%.
a. Push the REF and hold it in until the calibrator signal is displayed.
b. CHECK – the 1730–Series for a displayed amplitude of 138.6 to
141.4 IRE PAL (0.990 V to 1.010 V).
11. Check PIX MON OUT Operation
REQUIREMENT – Gain from Input 1:1
±
5% at 15 kHz. Dc level within
±
0.5 V of 0 V. Selected line dc offset by approximately 180 mV.
a. Install a 75
W
terminator on the CH–A INPUT.
b. Select CH–A and 2LINE SWEEP.
c. Connect a coaxial cable from the PIX MON OUT to the test oscillo-
scope. Use an in–line terminator at the test oscilloscope. Connect the