Tektronix 442, Instruction Manual

Page: 50 / 170

b. Set:
Calibration Procedure—442 Service
Performance Check
7. X-Axis Bandwidth Check
SOURCE CH 1/CH 2
VOLTS/DIV (CH 1 & CH 2) 5 m (IX)
SEC/DIV .1 m
AC-GND-DC (CH 1 & CH 2) DC
VERT MODE
CH 1
c. Set the Sine-wave Generator to 50 kHz (reference
frequency) and set the generator output amplitude for a 5-
division display.
a. Set:
SOURCE
VERT MODE
INTENSITY
AC-GND-DC (CH 1)
AC-GND-DC (CH 2)
X-Y
CH 2 (X-Y)
For barely
visible display
AC
GND
d. Set the generator frequency to 35 MHz.
e. CHECK—Display amplitude is at least 3.5 divisions.
b. Move the 50 D termination (Sine-wave Generator
signal) from the Channel 2 (Y) input connector to the
Channel 1 (X) input connector.
6. Channel 2 Bandwidth Check
a. Set:
VERT MODE CH 2
b. Move the 50 Cl termination (Sine-wave Generator
signal) from the Channel 1 input connectortothe Channel
2 input connector.
c. Set the generator frequency to 50 kHz (reference
frequency) and set the generator output amplitudefora5-
division display.
d. Set the generator frequency to 35 MHz.
c. Set the generator frequency to 50 kHz (reference
frequency) and set the generator output amplitude for 5
divisions of horizontal deflection (about 25 mV), this will
be a horizontal trace 5 divisions long. Set the horizontal
POSITION control to center the trace within the graticule
area.
d. Set the generator frequency to 2 MHz.
e. CHECK—Display is a horizontal trace at least 3.5
divisions long.
e. CHECK—Display amplitude is at least 3.5 divisions. f. Disconnect the test equipment setup.
LEVELED
SINE-WAVE
GENERATOR
442 OSCILLOSCOPE
so n
PRECISION
CABLE
* T O CHECK CHANNEL 2 BANDWIDTH
2 3 7 4 -6 A
Figure 4-2. Bandwidth check test setup.
REV A MAY 1980
4-7