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Performance Tests
TDS 684A, TDS 744A, & TDS 784A Service Manual
4–57
NOTE. You just checked the trigger sensitivity. If desired, you may repeat steps 1
through 4 for the other channels (CH2, CH3, and CH4).
5. Disconnect the hookup: Disconnect the cable from the channel last tested.
Output Signal Checks
The procedure that follows checks those characteristics of the output signals that
are listed as checked under Warranted Characteristics in Specifications. The
oscilloscope outputs these signals at its front and rear panels.
Equipment
Required
Two 50 W precision cables (Item 5)
One calibration generator (Item 10)
Prerequisites See page 4–15. Also, the Digitizing Oscilloscope must have passed
Check DC Voltage Measurement Accuracy on page 4–29.
1. Install the test hookup and preset the instrument controls:
50 W Coaxial Cables
To MAIN
TRIGGER
OUT
Calibration
Generator
Digitizing Oscilloscope
Figure 4–19: Initial Test Hookup
a. Hook up test-signal source 1:
H Connect the standard amplitude output of a calibration generator
through a 50 W precision coaxial cable to CH 3.
H Set the output of the calibration generator to 0.500 V.
b. Hook up test-signal source 2: Connect the Main Trigger Out at the rear
panel to CH 2 through a 50 W precision cable.
c. Initialize the oscilloscope:
Check Outputs — CH 3
Main and Delayed Trigger