Calibration— Type 544/RM 544
(a) Calibrator wa
IR510 and C
veform display.
524 are properly adjusted.)
—
—
(b) C524 improp
?rly adjusted.
Fig. 5-9. Typical waveform displays obtained when perform ing steps
39 and 40.
c. Rotate the VARIABLE (EXTERNAL HORIZONTAL
VOLTS/CM) control to its fully clockwise position.
b. Adjust C524 (see Fig. 5-8) for a least distorted wave
form (see Fig. 5-9b); that is, for minimum fast spike
or rolloff.
- -
Fig. 5-10. Distortion obtained when C503C is misadjusted.
b. Check that the display is 5 cm in amplitude. Toler
ance is ±3% .
c. Adjust C503C (see Fig. 5-2) for optimum square-wave
response. The display should exhibit no more than
±3% hook on the positive-going or negative-going
leading corners of the calibrator waveform. When
C503C is properly adjusted, the calibrator waveform
should appear similar to the display shown in Fig.
5-9a. Fig. 5-10 shows one form of distortion ob
tained if C503C is misadjusted.
42. Adjust C502C (X I00 Attenuator Compensation)—
(External) Horizontal Amplifier
a. Set the EXTERNAL HORIZONTAL VOLTS/CM switch
to 10 and the AMPLITUDE CALIBRATOR switch to
50 VOLTS.
b. Check that the display is 5 cm in amplitude. Toler
ance is ±3% .
c. Using a similar procedure as was done when per
forming step 41c, adjust C502C for optimum square-
wave response. Front corner aberrations should not
exceed 1 3%.
d. Set the AMPLITUDE CALIBRATOR switch to OFF and
the HORIZONTAL DISPLAY switch to NORMAL.
e. Disconnect the adapters, interconnecting lead, and
coaxial cables.
40. Check VARIABLE Control 10-to-1 Range—
(External) Horizontal Amplifier
a. Rotate the VARIABLE (EXTERNAL HORIZONTAL
VOLTS/CM) control to its fully counterclockwise
position.
b. Check that the waveform is 5 mm or less in ampli
tude. This is equivalent to 1/10 the amplitude, or
less, of the 5-cm display obtained when performing
step 38h.
41. Adjust C503C (X10 Attenuator Compensation)—
(External) Horizontal Amplifier
a. Set the EXTERNAL HORIZONTAL VOLTS/CM switch
to 1 and the AMPLITUDE CALIBRATOR switch to 5
VOLTS.
43. Check and/or Adjust High-Frequency
Compensations— Vertical Amplifier
a. Set the front-panel controls of the oscilloscope to the
following positions:
TRIGGERING MODE TRIG
TRIGGERING LEVEL —20° from 0
SOURCE NORM INT
TIME/CM .1 SEC
b. Set the Type TU-7 front-panel controls as follows:
Vertical Position Centered
Test Function + Pulse
Amplitude ZZ7.5
The remaining pertinent front-panel controls up to
this point in the procedure are already set to the posi
tions listed in Table 5-10.
5-14
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