TB 9-6625-2099-24
(7) Set DISPLAY MODE switch to CH 2.
f
(9) Ensure oscilloscope calibrator CHAN 2 is connected to TI CH 2 using a 50
eedthrough termination. Press oscilloscope calibrator CHANNEL pushbutton then press
blue soft pushbutton located below CHAN 2 on oscilloscope calibrator display.
(10) Ensure oscilloscope calibrator EDGE output and frequency are set as listed in
(11) Rotate oscilloscope calibrator knob located below EDIT FIELD pushbutton to
obtain oscilloscope display divisions as listed in table 7. Measure risetime using standard
risetime techniques. Risetime will be within limits as specified in table 7; if not, perform b below.
Table 7. CH 2 Risetime
Test
Oscilloscope calibrator
Test
instrument
Test
EDGE output
instrument
risetime limits
instrument
VOLTS/DIV
display
Oscilloscope
switch settings
(nS)
divisions
series
(V)
(kHz)
Volts
0.2
7900
1
100
5
4.7
0.2
7800
1
100
5
4.7
0.2
7700
1
100
5
4.7
0.2
7600
1
100
5
5.0
0.2
7500
1
100
5
5.8
0.2
7400
1
100
5
7.0
(12) Repeat technique of steps (8) through (11) above for series oscilloscope being used.
b. Adjustments
(1) Remove connections and 50
feedthrough termination from oscilloscope
calibrator and TI.
(2) Connect oscilloscope calibrator CHAN 1 to TI CH 1 using a 50 feedthrough
termination. Set oscilloscope output to CHAN 1 using technique in (11) above.
(3) Set DISPLAY MODE switch to CH 1 and CH 1 VOLTS/DIV switch to 10 mV.
(4) Set oscilloscope calibrator to EDGE, and output to 60 mV at 1 kHz.
(5) Adjust CH 1 POSITION, oscilloscope, and time base controls as necessary to
view waveform.
(6) Rotate oscilloscope calibrator knob located below EDIT FIELD pushbutton to
obtain 6 divisions on oscilloscope display. If aberrations are not less than 0.24 divisions
peak-to-peak, adjust R245, C245, and C275 (CH 2 adjust R445, C445, and C375) (fig. 1 or
2) for optimum square wave with aberrations of less than 0.24 divisions peak-to-peak (R).
(7) Repeat technique of (2) through (6) above for CH 2.
10. Final Procedure
a. Deenergize and disconnect all equipment.
b. Annotate and affix DA label/form in accordance with TB 750-25.