Performance Check Procedure—2205 Service
b. Connect the leveled sine-wave generator out
put via a 50-0 coaxial cable and a 50-0 termination
to the CH 2 OR V input connector.
c. Set the generator to produce a 50-kHz,
6-division display.
d. Increase the signal frequency until a
4.2-division display is obtained.
e. CHECK—The frequency is greater than
20 MHz.
f. Repeat parts c through e for ail VOLTS/DIV
settings from 10 mV to 5 V, up to the output-voltage
upper limit of the sine-wave generator being used.
g. Move the cable from the CH 2 or Y input con
nector to the CH 1 or X input connector. Set the
Vertical MODE switch to CH 1.
h. Repeat parts c through e for all indicated CH 1
VOLTS/DIV switch settings, up to the output-voltage
upper limit of the sine-wave generator being used.
3. Check Channel Isolation
a. Set:
CH 1 VOLTS/DIV 1 V
CH 2 VOLTS/DIV 0.5 V
Channel 2 AC-GND-DC GND
SEC/DIV 0.05 ms
b. Set the generator to produce a 20-MHz,
5-division display.
c. Set CH 1 VOLTS/DIV switch to 0.5 V for a
10-division display.
d. Set Vertical MODE switch to CH 2 and ALT.
e. CHECK—The display amplitude is less than 0.1
division.
f. Move the test-signal cable from the CH 1 or
X input connector to the CH 2 OR Y input connector.
g. Set:
Vertical MODE CH I
Channel 1 AC-GND-DC GND
Channel 2 AC-GND-DC DC
h. CHECK—The display amplitude is less than 0.1
division.
i. Disconnect the test equipment from the
instrument.
4. Check Common Mode-Rejection Ratio
a. Set:
10 mV
DC
BOTH.
NORM,
and ALT
b. Connect the leveled sine-wave generator out
put via a 50-0 coaxial cable, a 50-0 termination,
and dual-input coupler to the CHI OR X and CH 2 OR
Y input connectors.
c. Set the generator to produce a 10-MHz,
6-division display.
d. Set Vertical MODE switch to CH 2 INVERT and
ADD.
e. CHECK—Display amplitude is 0.6 division or
less.
f. Disconnect the test equipment from the
instrument.
VOLTS/DIV (both)
Channel 1 AC-GND-DC (both)
Vertical MODE
4-5
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