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Performance Tests
TDS 684A, TDS 744A, & TDS 784A Service Manual
4–45
1. Install the test hookup and preset the instrument controls:
a. Initialize the instrument:
H Press save/recall SETUP.
H Press the main-menu button Recall Factory Setup.
H Press the side-menu button OK Confirm Factory Init.
b. Modify the default setup:
H Press VERTICAL MENU.
H Press the main-menu button Coupling; then press the side-menu W
button to select 50 W coupling.
H Set the horizontal SCALE to 10 ns on the TDS 684A and 12.5 ns on
the TDS 7XXA.
c. Hook up the test-signal source: Connect the output of a
medium-frequency leveled sine wave generator (Item 11) to CH 1. Do
this through a 50 W precision coaxial cable, followed by a 10X
attenuator. See Figure 4–13.
50 W Coaxial Cable
Medium-Frequency
Sine Wave Generator
Digitizing Oscilloscope
Output
10X Attenuator
Figure 4–13: Initial Test Hookup
2. Confirm the trigger system is within time-accuracy limits for pulse-glitch or
pulse-width triggering (Horizontal Scale ≤1 ms):
a. Display the test signal: Set the output of the sine wave generator for a
100 MHz, five-division sine wave on screen. Press SET LEVEL TO
50%.