Adjustment Procedure—2205 Service
f. ADJUST-HF Comp (C241 and R241) for best
flat top on the front corner.
g. Repeat parts e and f until on further improve
ment is noted.
h. Set the CH 1 VOLTS/DIV switch to 5 mV,
i. Set the generator to produce a 5-division
display.
j. Check for aberrations of 5% (0.3 division) or
less.
k. Repeat part j for each CH 1 VOLTS/DIV switch
settings from 5 mV through 0.5 V. Adjust the gen
erator output and add or remove the 10X attenuator
as necessary to maintain a 5-division display at
each VOLTS/DIV switch setting.
l. Move the cable from the CH 1 or X input con
nector to the CH 2 OR Y input connector. Set the
Vertical MODE switch to CH 2.
m. Repeat part k for Channel 2.
n. Disconnect the test equipment from the
instrument.
f. Repeat parts c through e for all CH 1 VOLTS/
DIV switch settings, up to the output-voltage upper
limit of the sine-wave generator being used.
g. Move the cable from the CH 1 o r X input con
nector to the CH 2 o r y input connector. Set the
Vertical MODE switch to CH 2.
h. Repeat parts c through e for all CH 2 VOLTS/
DIV switch settings, up to the output-voltage upper
limit of the sine-wave generator being used.
14. Check Channel Isolation
a. Set:
CH 1 VOLTS/DIV 0.5 V
CH 2 VOLTS/DIV 1 V
Channel 1 AC-GND-DC GND
SEC/DIV 0.05 ms
b. Set the generator to produce a 20-MHz,
5-division display.
c. Set CH 2 VOLTS/DIV switch to 0.5 V for a
10-division display.
d. Set Vertical MODE switch to CH 1 and ALT.
NOTE
e. CHECK—The display amplitude is less than 0.1
division. :
Install the instrument cabinet for the re
maining vertical checks and allow a
20-minute warm-up period before continuing
with the "Adjustment Procedure". See the
" Cabinet“ remove and replace instructions
located in the "Maintenance" section of the
manual.
13. Check Bandwidth
a. Set:
f. Move the test-signal cable from the CH 2 OR Y
input connector to the CH 1 OR X input connector.
g- Set:
Vertical MODE CH 2
Channel 1 AC-GND-DC DC
Channel 2 AC-GND-DC GND
h. CHECK—The display amplitude is less than 0.1
division.
VOLTS/DIV (both)
Vertical MODE
SEC/DIV
Trigger SOURCE
5 mV
CH 1
10 ms
VERT MODE
i. Disconnect the test equipment from the
instrument.
15. Check Common-Mode Rejection Ratio
b. Connect the leveled sine-wave generator out
put via a 50-0 coaxial cable and a 50-0 termination
to the CH 1 or X input connector.
c. Set the generator to produce a 50-kHz, 6-
division display.
d. Increase the sine-wave frequency until a
4.2-diviston display is obtained.
e. CHECK—the frequency is greater than 20 MHz.
a. Set:
VOLTS/DIV (both) 10 mV
Channel 2 AC-GND-DC DC
Vertical MODE BOTH, NORM.
and ALT
b. Connect the leveled sine-wave generator out
put via a 50-0 coaxial cable, a 50-0 termination,
and a dual-input coupler to the CH 1 or X and CH 2
OR Y input connectors.
f
i
I
5—10
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