Tektronix 5441 Instruction Manual page 80

Adjustment Procedure-5441lR5441
f. Press the 1 MHz Rep Rate switch on the calibration
e. Position the 6-div display up so a 3-div display re-
fixture, and set the sweep rate of the time-base unit to mains within the graticule area.
0.1 psldiv. Adjust trigger level controls for a stable display.
f. CHECK-For optimum square leading corner and flat
NOTE top on the displayed pulse with aberrations not to exceed
C637 was a fixed capacitor prior to SN 8061533 and
0.3 div (6.0%).
is a fixed capacitor after SN 8094064.
5. Check Bandwidth
g. ADJUST-Vertical compensations C637 (this adjust-
a. Set the Test switch to Vert or Horiz Freq Resp and
merit is located on the main interface board between vertical
turn the Amplitude control fully clockwise.
compartments, SN 8061 533 to 8094064), C115, R115,
C155, R155, R167, and C181 in the order given, for opti-
mum square leading corner with aberrations within the limits
b. Set the time-base unit for a sweep rate of 1 msldiv.
given in part d. There is direct interaction between C115 and
R115, and between C155 and R155. Best results are usual-
ly obtained by setting R115 fully clockwise, then adjusting
c. Connect the MF signal generator output to the CW IN
C115. See Fig. 4-5 for the adjustment location.
connector of the Pulser.
h. ADJUST-R155 and R167 for minimum ringing of
d. Set the MF signal generator for a reference frequency
front corner. Adjust C637 (on the main interface board be-
of 3 MHz and adjust the output for an Sdiv display.
tween vertical compartments, SN 8061 533 to B094064),
C155 and C115 for a level front corner. After front-corner
adjustments have been made, adjust C181 for optimum
e. Set the Pulser Position and Amplitude controls to ob-
risetime and minimum front corner spike.
tain a centered, 6-div display.
i. Press the POWER switch to turn off the oscilloscope,
and install the Pulser in the center compartment. Pull the
POWER switch on.
NOTE
The calibration fixture (Pulser) CW Leveled light must
j. Repeat parts c through h. If necessary, compromise
be on and the MF signal generator must be properly
the vertical compensation adjustment to obtain the best re-
connected for a valid check. Refer to the calibration
sponse for both left and right vertical compartments.
fixture and MF signal generator manual for detailed
instructions.
4.
Check Vertical Position Effect
a. Set the Pulser to obtain a centered, positive-going,
f. Without changing the output amplitude, increase the
6-div display. Set the time-base unit for a triggered display
Senerator frequency until the displayed amplitude is reduced
on the rising portion of the pulse, at a sweep rate of
4.2 div.
20 nsldiv.
g. CHECK-The generator for a reading of at least
b. Position the 6-div display down so a 3-div display re- 90 MHz.
mains within the graticule area.
h. Press the POWER switch off and install the Pulser in
c. CHECK-For optimum square leading corner and flat
the center plug-in compartment. Pull the POWER switch on.
top on the displayed pulse with aberrations not to exceed
0.3 div (6.0%).
i. Repeat parts a through g for the center vertical
compartment.
d. Set the Pulser to obtain a centered, negative-going,
6-div display. Set the time-base unit for a triggered display
on the falling portion of the pulse, at a sweep rate of j. Press the POWER switch to turn off the oscilloscope
20 nsldiv. and disconnect the cable from the Pulser input connector.
REV MAY 1982
4-25