Check Position Range; Adjust Attenuator Compensation - Tektronix 2205 Service Manual

Adjustment Procedure—2205 Service
i. Set the Vertical MODE switch to CH 1.
j. Repeat parts b through g using the Channel 1
controls.
f .

Check Position Range

a. Set:
VOITS/DIV (both)
AC-GND-DC (both)
SEC/DIV
Trigger COUPLING
b. Set the calibration generator for 0.1 V.
c. Adjust the CH 1 VOLTS/DIV variable control to
produce a 5.25-division display.
d. Set the CH 1 VOLTS/DIV to 5 mV.
e. Set the calibration generator to produce a
0.2 V signal.
f. CHECK—The bottom and top of the trace may
be positioned above and below the center horizontal
graticule line by rotating the CH 1 POSITION control
fully clockwise and counterclockwise respectively.
g. Move the cable from the CH 1
nector to the CH 2 OR Y input connector.
h. Set the Vertical MODE switch to CH 2.
i. Repeat parts b through f using the Channel 2
controls.
j. Disconnect the test equipment from the
instrument.

6. Adjust Attenuator Compensation

a. Set:
VOLTS/DIV (both)
AC-GND-DC (both)
b. Connect the high-amplitude, square-wave
output from the calibration generator via a 5 0 - fl ter­
mination r a miniature probe tip to BNC adapter, and
the 10X probe to the CH 2 OR Y input connector.
c. Set the generator to produce a 1-kHz, 5 -
division display and compensate the probe using the
probp compensation adjustment (see the probe
instruction manual).
5 -8
d. Replace the probe and miniature probe tip to
BNC adapter with a 5 0 -fl coaxial cable and 5 0 -0
termination.
e. Set the generator to produce a 5-division
display.
f. ADJUST— Trimmer " 1 " for flattest response on
the square wave signal. See Figure 5-1 for location
of the trimmers.
10 mV
AC
0.2 ms
AC
X input con­
or
g. Replace the 5 0 -fl coaxial cable and 5 0 -fl ter­
10 mV
mination with the probe and miniature probe tip to
BNC adapter.
DC
h. Set the generator to produce a 5-division
square wave.
i. ADJUST— Trimmer " I N '' for flattest response
on square wave.
j. Set the CH 2 VOLTS/DIV switch to 20 mV.
k. Repeat parts d through i except adjust the " 2*
and " 2N" trimmers in parts f and i respectively.