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SECTION III. CALIBRATION PROCESS FOR AM-6880/U (TEKTRONIX TYPE 7A18) AND TEKTRONIX, TYPES 7A18A AND 7A18A W/OPTION 06
Table 4. Ch 2 Vertical Gain

Calibration Procedure For Dual Trace Amplifiers Am-6880/U (Type 7A18), Types 7A18A, 7A18A With Option 6, And Am-6785/U (Type 7A26) Page Navigation
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TB 9-6625-2099-24
(5) CH 1 and CH 2 VOLTS/DIV switches to 10 mV.
(6) CH 1 and CH 2 AC-GND-DC switches to DC.
(7) CH 1 and CH 2 VOLTS/DIV VARIABLE (CAL IN) pressed to in position.
8. Vertical Gain
a. Performance Check
(1) Connect oscilloscope calibrator CHAN 1 to TI CH 1 and connect oscilloscope
calibrator CHAN 2 to TI CH2.
(2) Set oscilloscope calibrator VOLTAGE output for 50 mV at 1 kHz amplitude.
(3) Adjust TI time base controls as necessary for a stable display.
(4) Adjust TI CH 1 GAIN control (front panel) for 5 divisions of display.
(5) Set oscilloscope calibrator VOLTAGE output to settings as listed in 1st row of
table 3. Oscilloscope calibrator frequency will remain at 1 kHz for all settings in table 3.
(6) Set CH 1 VOLTS/DIV switch to VOLTS/DIV settings in 1st row of table 3 and
rotate oscilloscope calibrator knob located below EDIT FIELD pushbutton to obtain
oscilloscope display divisions as listed in 1st row of table 3. Oscilloscope calibrator err
display will indicate within limits specified in table 3; if not, perform b below.
(7) Repeat technique of (3) through (6) above for remaining rows listed in table 3.
Oscilloscope calibrator err display indications will be within limits specified in table 3.
Table 3. CH 1 Vertical Gain
Oscilloscope
calibrator
Oscilloscope calibrator
Test instrument
Err display limits
VOLTS/DIV
voltage
Test instrument
(%)
output
display divisions
switch settings
5
mV
20
mV
4
2
20
mV
0.1
V
5
2
50
mV
0.2
V
4
2
0.1
V
0.5
V
5
2
0.2
V
1
V
5
2
0.5
V
2
V
4
2
1
V
5
V
5
2
2
V
10
V
5
2
5
V
20
V
4
2
(8) Set DISPLAY MODE switch to CH 2.
(9) Press oscilloscope calibrator CHANNEL pushbutton and press blue soft
pushbutton located below CHAN 2.
(10) Set oscilloscope calibrator VOLTAGE output for 50 mV at 1 kHz amplitude.
(11) Adjust TI time base controls as necessary for a stable display.
(12) Adjust TI CH 2 GAIN control (front panel) for 5 divisions of display.
5


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