Common-Mode Rejection Ratio; Common-Mode Rejection R A Tio - Tektronix 2245A Operator's Manual

e. CHECK—that the sine-wave generator output frequency is between 17
MHz and 23 MHz.
f. Disconnect the test setup.

19. Common-Mode Rejection Ratio

a. Connect leveled sine-wave generator (SG 503) output to the CH 1 and
CH 2 input connectors via a 50
BNC termination, and a BNC dual-input coupler.
b. Set the leveled sine-wave generator output for an eight-division signal-
display amplitude at 50 kHz.
c. Set:
VERTICAL MODE
CH 2 VOLTS/DIV
CH 2 INVERT
SCOPE BW
d. Adjust CH 1 or CH 2 VAR VOLTS/DIV (as needed) for smallest signal
amplitude.
e. Set the leveled sine-wave output frequency to 50 MHz.
f. Set the VERTICAL MODE to CH 1 (ADD off).
g. Set the leveled sine-wave output amplitude for an eight-division dis­
play.
h. Set the VERTICAL MODE to ADD (CH 1 off).
i. CHECK—the signal is less than 0.8 division in amplitude.
j. Disconnect the test setup.
2245A Operators
Performance Check Procedure
Cl
precision BNC coaxial cable, a 50 f 1
ADD (CH 1 off)
10 mV
On
Off
7-23