Tektronix 453 User Manual

e. Change the following control settings:
CH 2 POSITION
CH 1 Input Coupling
CH 2 Input Coupling
Midrange
DC
GND
f. Disconnect the outpu~ of the in-line termination from
the Channel 2 INPUT connector and connect it to the Chan-
nel 1 INPUT connector.
:g. Set the constant-amplitude generator for a four divi-
sion display
at its reference frequency {SO kHz).
h. Without changing the output amplitude, increase the
output frequency of the generator
until the deflection is re-
duced to 2.8 divisions {-3 dB point; see Fig. S-19).
i. CHECK-Output frequency of the generator must be
SO megahertz or higher.
27. Check Channel 1 and 2 Cascaded Upper
Bandwidth
Limit
a. Connect the CH 1 OUT connector to the Channel 2
INPUT connector
with an 18-inch 50-ohm BNC cable.
b. Change the following control settings:
VOL TS/DIV 5 mV
MODE CH 2
CH 2 Input Coupling DC
c. Set the constant-amplitude generator for a four-division
display
at its reference frequency {SO kHz}.
d. Without changing the output amplitude, increase the
output frequency of the generator
until the deflection is re-
duced to 2.8 divisions {-3 dB point; see Fig. S-19).
e. CHECK-Output frequency of generator must be 2S
megahertz or higher.
f. Disconnect the cable from between the CH 1 OUT and
Channel 2
INPUT connector.
28. Check Common-Mode Reiection Ratio
a. Connect the constant-amplitude generator to the Chan-
nel l and 2 INPUT connectors through the five-nanosecond
GR cable, 50-ohm in-line termination and the dual-input
coupler.
b. Change the following control settings:
VOLTS/DIV (CH 1 and 2)
SOmV
c. Set the constant-amplitude generator for a 3.2 division
display
at 20 megahertz.
REV. D, OCT. 1975
Performance Check/ Calibration-Type 453 / R453
d. Change the following control settings: -
VOLTS/DIV (CH 1 and 2)
MODE
INVERT
20mV
ADD
Pulled Out
e.
CHECK- CRT display for 0.4 division deflection, or
less (common-mode rejection ratio 20: 1 or better}.
NOTE
This check applies only when the channel 1 and
2 gain is correctly adjusted as given in step 13.
If the common-mode rejection ratio is lower than
20: 1, check and readjust the gain. Then recheck
this
step. (Transistors Q43, Q54, Ql 43, and
Ql 54 have the largest effect on common-mode
rejection ratio.)
f. Disconnect the dual-input coupler.
29. Check Attenuator Isolation Ratio
a. Change the following control settings:
CH 1 VOLTS/DIV
CH 2 VOL TS/DIV SmV
CH 2 Input Coupling
GND
MODE CH l
INVERT Pushed In
b. Connect the constant-amplitude generator to the Chan-
nel 1 INPUT connector through the five-nanosecond GR
cable and the SO-ohm in-line termination.
c. Set the constant-amplitude generator for a five-division
display
at 20 megahertz (use the variable control of the
generator,
if necessary, to obtain a five-division display).
d. Set the MODE switch to CH 2.
e. CHECK-CRT display for 0.1-division deflection, or
less (attenuator isolation ratio l 0,000: l or better).
f. Change the following control settings:
CH 1 VOLTS/DIV 5 mV
CH 2 VOLTS/DIV 1
CH l Input Coupling GND
CH 2 INPUT Coupling DC
g. Connect the constant-amplitude generator to the Chan-
nel 2 INPUT connector through the five-nanosecond GR
cable and the 50-ohm in-line termination.
h. Set the constant-amplitude generator for a five-division
display
at 20 megahertz (use the variable control of the
generator,
if necessary, to obtain a five-division display}.
i. Set the MODE switch to CH 1.
5-23

Tektronix 453 Specifications

General

Brand	Tektronix
Model	453
Category	Test Equipment
Language	English