Adjust High-Frequency Compensation - Tektronix 1A2 Instruction Manual

Calibration—Type 1A2
50 ohm
Termination
50 ohm
coaxial
cable
Control Settings
Fig. 7-19. Initial equipment setup for step 20,
Test Oscilloscope
Horizontal Display
Sweep Magnifier
Single Sweep Switch
Triggering Level
B (546, 547)
Normal (<1) (544)
x1 off (546, 547)
Normal
Fully clockwise and
pushed in
Triggering Source Norm Int
Triggering Coupling AC
Triggering Slope t
Triggering Mode Auto
Time/CM 1) pSEC
Variable (Time/CM) Calibrated
Horizontal Position Centered
Vernier (Horizontal
Pasition) Centered
CRT Cathode Selector CRT Cathode
Amplitude Calibrator Off
Type 1A2
MODE CH 2
TRIGGER SELECTOR CH 2
Both Channels
POSITION Centered
VOLTS/CM 05
VARIABLE CALIBRATED
PULL TO INVERT Pushed in
AC-DC-GND AC
20. Adjust High-Frequency Compensation ©
a, Equipment setup is shown in Fig. 7-13.
b. Apply an approximate 120 kHz signal from the Fast-
Rise + output of the Type 106 Square-Wave Generator to
the INPUT 2 connector through a GR to BNC adapter, 50
ohm coaxial cable and a 50 ohm termination.
c. Set both AC-DC-GND switches to AC and the Time/CM
switch to 0.1 pSEC.
d, Adjust the amplitude control for a display amplitude
of 4cm and the Triggering Level control for a stable display.
e. Position the rising portion of the display near the
graticule center.
f. Check—Waveform is flat topped with no more than
3% (1.2mm) peak-to-peak rolloff, spiking and/or ringing.
7-15