Tektronix 7613 User Manual

Calibration—7613/R7613 Service
g. ADJUST—the INTENSITY control for three divisions
of vertical deflection on the CRT. Position the display so
the positive leading edge of the waveform is displayed.
h, ADJUST—C1158 for optimum square positive
leading corner (use a low capacitance screwdriver to adjust
the variable capacitor).
i. Disconnect the probe.
29. Auto Focus Compensation and Operating Levels
a. Connect the probe tip to R1137, Z-Axis output.
b. ADJUST—the INTENSITY control for three divisions
of vertical deflection on the CRT. Position the display so
the negative leading edge of the waveform is displayed.
c. ADJUST—C1138 for optimum square negative
leading corner (use a low capacitance screwdriver to adjust
the variable capacitor).
d. Disconnect the probe.
e. Set the 191 constant amplitude signal generator to 50
kHz only.
f. Connect the 191 output to the input of the 7A15A.
Adjust the amplitude of the 191 for a two division display.
g. Midrange R1045, the front panel FOCUS control.
h. Reduce the intensity so the display is just visible.
Adjust R1250, the Focus Preset control, for optimum
focus.
i. Increase the INTENSITY control to midrange and
adjust R1121 Auto Focus bias set control for optimum
focus.
j. Increase the intensity to almost maximum and adjust
R1116 Auto Focus Gain for optimum focus.
k. Repeat steps m through o. Focus the display for a
low intensity display and change the intensity to a brighter
display. Check that the focus of the display remains
optimized.
2-16
|. Disconnect all test equipment.
CALIBRATOR
Equipment Required
1. Precision DC voltmeter
2. 7A15A plug-in unit
3. 7B53A plug-in unit
4. BNC to pin-jack cable.
5. Three-inch screwdriver
Control Settings
Set the controls as given under Preliminary Control
Settings.
30. Adjust Calibrator Output Voltage
a. Change jumper P1066 (see Fig. 2-8) to the DC
Position.
b. Connect the precision DC voltmeter between the 4 V
and GND pin jacks.
c. CHECK—Meter reading; 4 volts +0.04 volt (within
+0.08 volt if this measurement is made outside the +15°C
to +35°C range).
d. ADJUST—4 Volts adjustment R1077 (see Fig. 2-8)
for a meter reading of exactly 4 volts.
Fig. 2-8. Location of Calibrator adjustments (Calibrator board).
7613

Tektronix 7613 Specifications

General

Brand	Tektronix
Model	7613
Category	Test Equipment
Language	English