Tektronix 3A74 Calibration Procedure page 3

FACTORY TEST LIMITS
Factory Test Limits are qualified by the conditions specified in the main body of the
Factory Calibration Procedure.
correspond procedure steps where the check or adjustment is made.
out Factory Test Limits (setups, presets, etc.) are not listed.
are! the
nd
The numbers and letters to the left of the: limits
Steps with-
Instruments may not
meet Factory Test Limits if calibration or checkout methods and test equipment differ
substantially from those in this procedure.
10.
11.
ZENER VOLTAGE
+50 +5 volts
DC BALANCE
CH 1, 2, 3, 4, DC BAL (R427): Must
adjust within +90° of the center of
rotation; less than 0.2div trace shift
when VAR GAIN is changed.
POSITION RANGE
Position Range control (R449) within
+90° of center of rotation
All traces must be within t+tldiv of
vertical electrical center (with vert-
Output Circuit Balance: +0.2div, max
NORM TO INVERT SHIFT
tldiv, max
LINE VOLTAGE TRACE SHIFT
Vertical drift due to changing line
voltage (105VAC to 125VAC): 0O.5div
or less
CALIB (Output amplifier gain)
Range: 18 to 22
Balance: with one side set at 20,
the other must be 20 #1.
GRID CURRENT
Less than 0.2div of trace shift
15.
17.
ALTERNATE MODE
CHOPPED MODE
>35V P-P
Effect of multi-channel operation
on gain: Less than 2% change