TEK 2225 - Page 73

Adjustment Procedure-2225 Service
j. CHECK-The frequency is greater than 5 MHz.
k. Repeat Parts h through
j for all ranges from
10
mV to 0.2 V.
I. Set the CH 1 VOLTSIDIV Variable to
XI (push
CAL knob in).
m. Set Vertical MODE to CH
2.
n. Repeat Parts b through I for Channel 2.
16. Check Channel Isolation
a. SET:
CH 1
VOLTSIDIV 1 V
CH
2 VOLTSIDIV 0.5 V
AC-GND-DC (CH 1) DC
AC-GND-DC (CH
2) GND
Vertical MODE CH 1
SECIDIV 0.05 JLS
b. Connect the leveled sine-wave generator out-
put via a
504 BNC coaxial cable and a 504 BNC
termination to the CH 1
OR X input connector.
c. Set CH 1 VOLTSIDIV switch to 0.5 V for a
1 0-division display.
d. Set the generator to produce a 10-MHz, 5 V
peak-to-peak output.
e. Set Vertical MODE to CH 2 and ALT.
f. CHECK-That the CH 1 trace amplitude is less
than 0.1 division.
g. Move the test-signal cable from the CH 1
OR X
input connector to the CH 2 OR Y input connector.
h. SET:
Vertical MODE CH 1
CH 1 AC-GND-DC GND
CH
2 AC-GND-DC DC
i. CHECK-That the display amplitude is less than
0.1 division.
j. Disconnect the test equipment from the
instrument.
17. Check Common-Mode Rejection Ratio
a. SET:
VOLTSIDIV (both)
10
mV
AC-GND-DC (both) DC
Vertical MODE BOTH, NORM,
and ALT
b. Connect the leveled sine-wave generator out-
put via a
504 BNC coaxial cable, a 504 BNC
termination, and a dual-input coupler to the
CH
1 OR X and CH 2 OR Y input connectors.
c. Set the generator to produce a 10-MHz, six-
division display.
d. Set Vertical MODE to INV and ADD.
e. CHECK-That the ADD display is less than 0.6
division.
f. Disconnect the test equipment from the
instrument.
Scam by ARTEK MEDLQ =>
REV APR 1990