f. Check—Trace separation at the vertical center of the
display should not exceed 1.5 mm (3%).
g. Change the VERTICAL SENSITIVITY switch to .1 VOLTS/
CM.
h. Change the Standard Amplitude Calibrator to 0.5
volts.
i. Move the patch cord from the 5 mV CAL. OUT con
nector to the 500 mV CAL. OUT connector.
j. Check—Trace separation at the display center not to
exceed 1.5 mm (3%).
Performance Check— Type 503
42. Check Calibrator Symmetry
a. Requirement— Ratio between adjacent half-cycles 2:1 or
less.
b. Change the VERTICAL +INPUT switch to GND.
c. Change the SWEEP TIME/CM to .2 mSEC, and adjust
the LEVEL control for a stable display.
d. Rotate the SWEEP TIME/CM VARIABLE control counter
clockwise until one cycle of the calibrator waveform occu
pies 10 cm of the graticule.
e. Check—The calibrator waveform symmetry should be
within a ratio of 2:1.
43. Check Calibrator Frequency
a. Requirement— Calibrator frequency 350 Hz ±50% .
b. Return the SWEEP TIME/CM VARIABLE to CALIBRATED.
c. Change the SWEEP TIME/CM to 1 mSEC.
d. Check—The length of one calibrator cycle should be
between 1.9 and 5.7 cm (350 Hz ±50% ).
44. Check Calibrator Jitter
a. Requirement—Horizontal jitter not more than 1.5 cm.
b. Change the HORIZONTAL DISPLAY switch to X50.
The INTENSITY may have to be increased to view the
display.
c. Rotate the HORIZONTAL POSITION control counter
clockwise to center the leading edge of the last cycle of
the calibrator waveform.
d. Check— Horizontal jitter not more than 1.5 cm.
e. Disconnect all equipment.
rcj
5-14
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