Tektronix 503

Performance Check— Type 503
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t
Trace
seperation
easurement
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Fig. 5-1. Typical display, am plifier balance check (DC common
mode rejection ratio) — vertical amplifier; 1 mV/CM sensitivity.
f. Change the Standard Amplitude Calibrator output to
0.5 volts, and the HORIZONTAL SENSITIVITY switch to 1
mV/CM, and repeat step (d).
g. Check—The horizontal amplitude of the display should
not exceed 5 cm anywhere in the graticule area.
h. Change the HORIZONTAL SENSITIVITY switch to .5
VOLTS/CM, and the Standard Amplitude Calibrator to 50
volts, and repeat step (d).
i. Check—The horizontal amplitude of the display should
not exceed 2 cm anywhere in the graticule are, (50:1 CMRR).
j. Change the HORIZONTAL SENSITIVITY switch to 5
VOLTS/CM and the Calibrator output to 100 volts; repeat
step (d).
k. Check—The horizontal amplitude of the display should
not exceed 4 mm anywhere in the graticule area.
13. Check Compression or Expansion— Vertical
a. Requirement— Display amplitude change not more than
±1.5 mm with a 2-cm display.
b. Change the Standard Amplitude Calibrator output to
.5 volts.
c. Set the VERTICAL + INPUT switch to DC, and the
HORIZONTAL + and -INPU T to GND.
d. Move the Calibrator signal from the HORIZONTAL
+ INPUT connector to the VERTICAL +INPUT connector,
and set the VERTICAL SENSITIVITY switch to .2 VOLTS/CM.
e. The display should consist of two dots spaced verti
cally; center the display vertically and horizontally.
f. With the VERTICAL VARIABLE control, adjust the dot
spacing for 2 cm exactly, and move the display to the top
2 cm of the graticule.
g. Check— Dot spacing 2 cm ±1 .5 mm.
h. Move the display to the bottom 2 cm of the graticule.
i. Check— Dot spacing 2 cm ± 1.5 mm.
j. Return the VARIABLE control to CALIBRATED.
14. Check A m plifier Balance— Vertical (DC
Common M ode Rejection)
a. Requirement— Rejection ratios and deflection toler
ances as listed in Table 5-1, with specified input signals and
deflection sensitivities.
b. Set the VERTICAL —INPUT switch to DC, and move
the Calibrator signal from the HORIZONTAL —INPUT con
nector to the VERTICAL — INPUT connector.
c. Change the Standard Amplitude Calibrator to 5 volts.
d. Change the HORIZONTAL DISPLAY switch to SWEEP
NORMAL (X I). The INTENSITY may have to be increased
to view the display.
e. With the VERTICAL POSITION control, move the dis
play to the top line of the graticule, and then to the bottom
line of the graticule.
f. Check— Deflections as indicated in Table 5-1. See
Fig. 5-1 for a typical display.
TABLE
5-1
Input Deflection
Rejection
'Maximum
Deflection
(trace
Signal
Sensitivity Ratio separation)
5 volts .2 VOLTS/CM 100:1
2.5 mm
0.5 volts
1 mV/CM
100:1
5 cm
50 volts .5 VOLTS/CM 1
50:1 2 cm
100 volts 5 VOLTS/CM |
50:1
4 mm
'The degree of
trace separation should be checked by positioning
the display over the entire graticule area.
15. Check Attenuator Accuracy— Vertical
+ Input and — Input
a. Requirement— Vertical deflection accuracy within ±3 % .
b. Set the VERTICAL -INP UT switch to GND.
c. Change the Standard Amplitude Calibrator output to
5 mV, and change the VERTICAL SENSITIVITY switch to 1
mV/CM.
d. Check— Vertical deflection of 5 cm ±1 .5 mm.
e. Set the Standard Amplitude Calibrator output and
VERTICAL SENSITIVITY switch as indicated in Table 5-2,
checking for the deflections listed.
f. Change the VERTICAL +INPUT switch to GND, and
change the VERTICAL —INPUT switch to DC.
g. Repeat step (e).
16. Check Attenuator Accuracy— Horizontal
+ Input and — Input
a. Requirement— Horizontal deflection accuracy within
±3% .
b. Move the two 50-ohm cables from the VERTICAL + IN
PUT and -INPUT connectors to the HORIZONTAL -f INPUT
and -INPU T connectors.
5-4
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