Performance Check Procedure
h. Same as b. above.
i. Repeat CHECK for CH 4.
j. Set CH 3 and CH 4 VOLTS/DIV to 0.5 V.
k. Set calibration generator to Std Ampl output, 2 V.
l. CHECK—the signal amplitude is between 3.92 and 4.08 divisions.
m. Set:
VERTICAL MODE CH 3 (CH 4 off)
CH 3 VOLTS/DIV 0.5 V
n. Move the test signal to the CH 3 input.
o. Repeat CHECK procedure for CH 3.
p. Disconnect the test setup from the 2245A.
11. ADD Mode and CH 2 INVERT Deflection Accuracy
a. Set:
VERTICAL MODE ADD (all others off)
CH 1 and CH 2 VOLTS/DIV 0.1 V
CH 1 and CH 2 Input COUPLING DC
b. Connect calibration generator Std Ampl output to the CH 1 and CH 2
inputs via a 50 A precision BNC coaxial cable and a BNC dual-input
coupler.
c. Set the calibration generator to Std Ampl output, 0.2 V.
d. Position the ADD signal to the center of the crt graticule with the CH 1
and CH 2 POSITION controls.
e. CHECK—That the ADD signal amplitude is between 3.92 and 4.08 divi
sions.
f. Set CH 2 INVERT On.
g. CHECK—That the ADD signal amplitude is 0.08 division (less than half
a minor graticule division) or less excluding trace width (sweep will free
run).
h. Disconnect the test setup from the 2245A.
2245A Operators
7-17
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