Tektronix 1740A Series, Руководство пользователя

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Performance Verification
1740A/1750A/1760 – Series Service Manual
4–31
f. Enter the GAIN menu and select VARIABLE OFF. Exit the GAIN
menu.
28. Clamp Stability, Phase Control, and Position Control Range
Requirement – Clamp Stability: 1/64 inch (0.4 mm). Phase Control
Range: 360
°
continuous rotation. Position Control Range: 0.236 inch (6
mm) from center.
a. Select CH-A INPUT and INT REF.
b. Remove the dual-input coupler from the 1740A/1750A/1760–Series.
Connect the television signal generator color bar signal to the CH-A
INPUT. Terminate the loop-through in 75
.
c. Check – while rotating the VECTOR PHASE control 360
°
(bezel knob),
that the center dot shifts 1/64 inch (0.4 mm).
d. Check – while rotating the VECTOR PHASE control 360
°
(bezel knob),
that the vectors move in a smooth continuous motion.
e. Check – while varying the VERT and HORIZ POS controls, that the
center dot can be positioned at least
1/4 inch (6 mm) from the centered
position.
f. Return the vector dot to the centered position.
29. External Horizontal Gain
Requirement – External Horizontal Gain: 2 divisions/Volt 2%.
a. Enter the PRESET menu and select RECALL FACTORY.
b. Enter the CONFIG menu. Select the REMOTE submenu. Select REM
INPUT EXT HORIZ, and STAIRCASE:RGB.
c. Set the function generator frequency for a 1 kHz square wave, with an
amplitude of 0 to +5 V as measured on the test oscilloscope. (5 V
square wave to Staircase and Horizontal In on the remote connector.)
d. Connect the function generator output via the Ext Horiz/RGB and
YRGB remote cable adapter to the REMOTE INPUT connector pin 1.
See Figure 4–1.
e. Set pin 3 of the remote cable low.
f. Check – that the two vertical lines are 10.0 divisions apart 1 minor
division.
g. Set pin 3 of the remote cable high.
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