Tektronix 5441 Instruction Manual page 78

Adjustment Procedure-5441 /I35441
e. ADJUST-Vertical Gain, R175, for 6 div of deflection. g. ADJUST-R155 and R167 for minimum ringing of
front corner. Adjust C637 (on the main interface board be-
tween vertical compartments, SN 8061533 to B094064),
f. Press the POWER switch to turn off the oscilloscope
C155 and C115 for a level front corner. After front corner
and remove the vertical amplifier from the left vertical com- adjustments have been made, adjust C181 for optimum
partment and install it in the center compartment. Pull the risetime and minimum front corner spikes.
POWER switch on.
h. Press the POWER switch to turn off the oscilloscope,
g. Repeat part d of this step, and if necessary, readjust
and install the vertical amplifier in the center compartment.
Vertical Gain R175 for the optimum gain setting. Compro- Pull POWER switch on.
mise for both vertical compartments.
i. Repeat parts d through g. If necessary, compromise
3. Adjust Vertical Compensation
the vertical compensation adjustment to obtain the best re-
sponse for both left and right vertical compartments.
a. Press the POWER switch to turn off the oscilloscope
and install the vertical amplifier in the left vertical compart-
ment. Pull the POWER switch on.
b. Set the vertical amplifier CH 1 VoltsIDiv switch to .l.
4. Check Bandwidth
Connect the pulse generator to the CH 1 input connector
a. Press the POWER switch to turn off the oscilloscope
with a 50 R termination and a 42-inch bnc cable.
and install the vertical amplifier in the left vertical compart-
ment. Pull the POWER switch on.
c. Set the time-base unit for a calibrate sweep rate of
20 nsldiv and triggering for auto mode, ac coupled from the
b. Set the time-base unit for a sweep rate of 10 psldiv.
LEFT source. Adjust the trigger level control for a stable
display, triggered on the rising portion of the pulse. Center
the pulse horizontally on the graticule.
c. Disconnect the bnc cable from the pulse generator
and connect it to the output connector of the MF signal
generator.
d. CHECK-For optimum square leading corner and flat
top on a 5-div displaved pulse with aberrations not to ex-
ceed +0.2 or -0.2 div, ' i t h total peak-to-peak aberrations
not to exceed 0.2 div.
d. Set the vertical amplifier VoltsIDiv switch to .1 and
adjust the MF signal generator controls for a 6-div display at
a frequency of 3 MHz.
e. ADJUST-Vertical compensation R121 for optimum
flat top on the displayed pulse, then adjust R120 and R123,
increasing the sweep rate of the time-base, when neces-
e. Without changing the output amplitude, increase the
sary. Repeat as necessary to obtain optimum flat top on the
generator frequency until the displayed amplitude is reduced
waveform. See Fig. 4-5 for adjustment location.
to 4.2 div.
NOTE
f. CHECK-The generator for a reading of at least
C637 was a fixed capacitor prior to SN 8061533 and
50 MHz.
a fixed capacitor from SN 8094064 to SN 8094584.
f. ADJUST-Vertical compensations C637 (this g. Press the POWER switch to turn off the oscilloscope
adjustment is located on the main interface board between
and install the vertical amplifier in the center vertical com-
vertical compartments, SN 8061533 to 8094064, and SN
partment. Pull the POWER switch on.
8094585 & Up), C115, R115, C155, R155, R167, and C181
in the order given, for optimum square leading corner with
aberrations within the limits given in part d of this step.
h. Repeat parts d through f for the center vertical
There is direct interaction between C115 and R115, and
compartment.
between C155 and R155. Best results are usually obtained
by setting R115 fully clockwise, results are usually obtained
by setting R115 fully clockwise, then adjusting C115. See
i. Press the POWER switch to turn off the oscilloscope
Fig. 4-5 for adjustment location.
and disconnect cable and termination from the equipment.
REV MAY 1983
4-23