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SECTION IV. CALIBRATION PROCESS FOR AM-6785/U (TEKTRONIX, TYPE 7A26)
Table 9. 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
(6) CH 1 and CH 2 AC-GND-DC switches to DC.
(7) BW switch to FULL.
13. Vertical Gain
a. Performance Check
(1) Connect oscilloscope calibrator CHAN 1 to TI CH 1 and connect oscilloscope
calibrator CHAN 2 to TI CH 2. Ensure oscilloscope calibrator CHAN 1 output is presently
selected by pressing oscilloscope calibrator CHANNEL pushbutton and then pressing blue
soft pushbutton located below CHAN 1 on oscilloscope calibrator display.
(2) Set oscilloscope calibrator VOLTAGE output to 50 mV and frequency to 1 kHz.
(3) Adjust CH 1 POSITION, oscilloscope, and time base controls as necessary to
view waveform.
(4) Adjust CH 1 (front panel) GAIN control for 5 divisions of display.
(5) Set oscilloscope calibrator VOLTAGE output as listed in 1st row of table 8.
(6) Set CH 1 VOLTS/DIV switch as listed in 1st row of table 8 and rotate
oscilloscope calibrator knob located below EDIT FIELD pushbutton to obtain oscilloscope
display divisions as listed in 1st row of table 8. Oscilloscope calibrator err display will
indicate within limits as specified in table 8; if not, perform b(1) through (4) below.
(7) Repeat technique of steps (4) through (6) above for remaining rows listed in table
8. Oscilloscope calibrator err display indications will be within limits specified in table 8.
Table 8. CH 1 Vertical Gain
Oscilloscope
Test instrument
calibrator
VOLTS/DIV
Err display limits
Oscilloscope calibrator
Test instrument
VOLTAGE output
switch settings
display divisions
(%)
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)  Set oscilloscope calibrator output to CHAN 2 using technique in step 1 above.
(10) Set oscilloscope calibrator VOLTAGE output to 50 mV at 1 kHz.
(11) Adjust CH 2 POSITION, oscilloscope, and time base controls as necessary to
view waveform.
(12) Adjust CH 2 (front panel) GAIN control for 5 divisions of display.
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