Adjustment Procedures
TDS 684A, TDS 744A, & TDS 784A Service Manual 5–17
Digitizing Oscilloscope
Calibration
Generator
Tunnel Diode Pulser
10X Attenuator
Precision Cable
Output
Figure 5–8: Initial Test Hookup
c. Initialize the oscilloscope:
HPress save/recall SETUP.
HPress the main-menu button Recall Factory Setup.
HPress the side-menu button OK Confirm Factory Init.
d. Modify the initialized front-panel control settings:
HSet vertical SCALE to 5 mV.
HPush SET LEVEL TO 50% as required to trigger the signal.
HPress VERTICAL MENU. Then press the main-menu button
Coupling. Press the side-menu button to toggle to 50 W coupling.
HPress CLEAR MENU.
2. Adjust the Probe:
a. Display and store the reference signal:
HSet the high-amplitude output of the generator to 60 V at the input
to the tunnel diode pulser.
HSet the Period (repetition rate) to 10 kHz.
HAdvance the triggering level of the tunnel diode pulser until a five to
six division square wave appears on screen. Do not advance the knob
any further than required to achieve stable amplitude.
HUse the vertical POSITION to center the displayed waveform on
screen.