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Performance Verification
1740A/1750A/1760 – Series Service Manual
4–19
e.
Connect a 75
W
cable from the 1740A/1750A/1760–Series PIX OUT to
the test oscilloscope, terminating the oscilloscope end of the cable with a
75
W
feedthrough terminator.
f.
Check – for a signal amplitude on the test oscilloscope of 1 V
0.75 minor division.
g. Replace the VAC output on the CH-A INPUT with the leveled sine wave
generator output. Terminate the loop-through in 75
W
.
h. Set the leveled sine wave generator frequency to 50 kHz and adjust its
amplitude for a 1 V display on the test oscilloscope. Set the generator
frequency to 1.0 MHz.
i.
Check – that the amplitude on the test oscilloscope is 1 V
0.75 minor
division while varying the leveled sine wave generator frequency from
1.0 to 6.0 MHz.
j.
Remove the PIX OUT cable from the 1740A/1750A/1760–Series and
the test oscilloscope.
12. Input Channel Frequency Response
Requirement – X1 Flat Response (No Filter):
2% to 10 MHz. X5 and
X10 Flat Response:
4% to 10 MHz.
a. Verify that EXT REF is selected, then remove the terminator on the
CH-A INPUT.
b. Connect the 015-0413-00 Peak-to-Peak Detector Head to the open CH-A
INPUT and connect the other end to the 015-0408-00 Peak-to-Peak
De Input.
c.
Connect the Peak-to-Peak Detector Output to either an oscilloscope or
DMM. Note: The DMM must have a “Reading Null” ability, or else use
the oscilloscope.
d. Set the leveled sine wave generator frequency to 50 kHz and adjust the
generator amplitude for exactly 100 IRE (700 mV PAL) of display on
the 1740A/1750A/1760–Series.
e.
Adjust the Peak-to-Peak Detector plus amplifier and input control until
the Green LED is on.
f.
Null the DMM readout to 0.00 mV or center the trace on the oscillo-
scope graticule.
g. Set the sine wave generator frequency to 1 MHz.
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Содержание 1740A Series
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