Tektronix 070-8462-03, Instruction Manual

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Performance Verification
1735 HD High Definition Waveform Monitor
5–15
i. Check using the CH B OFFSET control (push in and rotate), that
CH 1B, CH2B, and CH 3B can be positioned to the +750 mV graticule
line and to the +50 mV graticule line.
j. Enter the MENU and select OFFSETS, then DISABLED. Exit the
MENU.
15. Check DC Restorer Operation
Requirement: Attenuation of 50 Hz input signal: Slow Clamp passes >80%
of 50 Hz signal; Fast Clamp removes >95% of 50 Hz signal. Blanking level
shift with APL change, less than 1% (7 mV).
a. Connect the Sync Out signal from the TSG1001 to the 1735 HD EXT
REF Input.
b. Connect a 50
W
precision cable and 50–75
W
minimum loss attenuator
from the output of the function generator to the 1735 HD CH 1A
INPUT.
c. Select CH 1A INPUT, CLAMP On, EXT REF, and TWO LINE Sweep
on the 1735 HD.
d. Set the function generator Frequency to 50 Hz, and adjust the Amplitude
of the sine wave for 700 mV on the 1735 HD.
e. Enter the 1735 HD MENU and select SLOW CLAMP. Exit the MENU.
f. Check for more than 560 mV of sine wave on the 1735 HD.
g. Enter the 1735 HD MENU and select FAST CLAMP. Exit the MENU.
h. Check for less than 35 mV of sine wave on the 1735 HD.
i. Replace the function generator signal on the CH1A INPUT with a 10%
to 90% DC Bounce signal.
j. Select the 1735 HD CH 1A INPUT.
k. Position the blanking level to the baseline.
l. Check for less than 7 mV (1%) shift of the blanking level as the signal
bounces between 10% and 90% APL.
m. Changing input cables and 1735 HD INPUT selection to each input
channel in turn, repeat steps k. and l. for all remaining input channels:
CH 2A, CH 3A, CH 1B, CH 2B, and CH 3B.
n. Turn Off the CLAMP and disconnect the input cable and terminations
from the 1735 HD.