Channel Isolation - Tektronix 2245A Operator's Manual

Performance Check Procedure

Channel Isolation

2 0 .
a. Set:
CH 1 and CH 2 VERTICAL MODE
CH 2 INVERT
CH 1, CH 2, CH 3, and CH 4
VOLTS/DIV
TRIGGER SOURCE
b. Connect the leveled sine-wave generator (SG 503) output to the CH 1
Input via a 50 Cl precision BNC coaxial cable and a 50 f l BNC termina­
tion.
c. Set the leveled sine-wave generator (SG 503) output for a five-division
signal display amplitude at 100 MHz.
d. Set CH 2, CH 3, and CH 4 VERTICAL MODE On (CH 1 off).
e. CHECK—display amplitude is 0.1 division or less, excluding trace
width, on the CH 2, CH 3, and CH 4 traces.
f. Move sine-wave generator signal to the CH 2 Input.
g. Set:
CH 1, CH 3, and
CH 4 VERTICAL MODE
TRIGGER SOURCE
h. CHECK—display amplitude is 0.1 division or less, excluding trace
width, on the CH 1, CH 3, and CH 4 traces.
I. Move sine-wave generator signal to the CH 3 Input.
j. Set:
CH 1, CH 2, and CH 4
VERTICAL MODE
TRIGGER SOURCE
k. CHECK—display amplitude is 0.1 division or less, excluding trace
width, on the CH 1, CH 2, and CH 4 traces.
7-24
On (ADD off)
Off
0.1 V
CH 1
On (CH 2 off)
CH 2
On (CH 3 off)
CH 3
2245A Operators