Performance Check/Calibration-Type 422 AC-DC
i. Position the probe tip so it is in contact with the
CALIBRATOR jack.
j. Set the TIME/DIV switch to .5 ms.
k. CHECK—CRT display exactly four divisions in ampli
tude (two volts amplitude at CALIBRATOR JACK).
NOTE
Checks in parts k, m and o are valid only if the Chan
nel 1 and 2 GAIN were adjusted exactly in step 12 of
this procedure.
l. Set both VOLTS/DIV switches to the CALIBRATE 4
DIVISIONS position.
m. CHECK—CRT display four divisions ±0.06 division
in amplitude (internal calibrator accuracy within 1.5%,
CALIBRATE 4 DIVISIONS position of Channel 1 VOLTS/
DIV switch operating correctly).
n. Set the vertical Mode switch to CH 2.
o. CHECK—CRT display four divisions ±0.06 division in
amplitude (internal calibrator accuracy within 1.5%, CALI
BRATE 4 DIVISIONS position of Channel 2 VOLTS/DIV
switch operating correctly).
58. Check Calibrator Repetition Rate
a. Set the TIME/DIV switch to 0.2 ms.
b. Position the start of the display to the farthest left
vertical line.
c. CHECK—CRT display for length of one complete
cycle between 4.2 and 6.3 divisions (repetition rate one
kilohertz ±20%).
59. Check Calibrator Duty Cycle
a. Set the TIME/DIV switch to 50 jus.
b. Set the VARIABLE TIME/DIV control for one com
plete cycle in 10 divisions.
c. CHECK—CRT display for length of positive segment
of the square wave between 4.5 and 5,5 divisons (duty
cycle 45% to 55%).
This completes the checkout/calibration procedure for
the Type 422 with AC-DC Power Supply. Replace the cabi
net and re-attach the power supply to the indicator. If the
instrument has been completely checked and adjusted to
the tolerances given in this procedure it will meet or exceed
the specifications given in Section 1.
5-37
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