TB 9-6625-2139-35
(15) Set oscilloscope calibrator EDGE output to 10 kHz and 5 divisions of vertical
deflection on TI.
(16) Adjust CH 1 POSITION control to position top of waveform to the center
horizontal graticule line.
(17) Adjust C3 (fig. 1) and R47 (fig. 1) for the best square corner and flat top.
(18) Remove 50Ω feedthrough termination and connect calibration generator
OUTPUT to TI CH 1.
(19) Set oscilloscope calibrator voltage output to 10 mV at 1 kHz .
(20) Position controls as listed in (a) through (c) below:
(a) CH 1 VOLTS/DIV switch to 2m.
(b) A AND B SEC/DIV switches to .2 ms.
(c) CH 1 POSITION control to view waveform.
(21) Adjust R26 (fig. 1) for 5 divisions of vertical deflection on TI (R).
(22) Set CH 1 VOLTS/DIV switch to 10m.
(23) Set oscilloscope calibrator output to 50 mV.
(24) Adjust R145 (fig. 1) for 5 divisions of vertical deflection on TI (R).
(25) Connect oscilloscope calibrator CHAN 1 to TI CH 1 using a 5-80 pF
standardizer.
(26) Set oscilloscope calibrator EDGE output to 1 kHz and amplitude for 5 divisions
of vertical defection on TI.
(27) Adjust 5-80 pF standardizer for optimum square wave.
(28) Set CH 1 VOLTS/DIV switch to .1.
(29) Replace 5-80 pF standardizer with 50Ω feedthrough termination.
(30) Set oscilloscope calibrator output amplitude for 5 divisions of vertical deflection
on TI.
(31) Adjust C12 (fig. 1) for best front corner.
(32) Replace 50Ω feedthrough termination with a 5-80 pF standardizer and repeat
(30) above.
(33) Adjust C11 (fig. 1) for best flat top.
(34) Repeat (29) through (33) above until no further improvement is noted.
(35) Set CH 1 VOLTS/DIV switch to 1.
(36) Remove 5-80 pF standardizer and connect oscilloscope calibrator CHAN 1 to TI
CH 1. Repeat (30) above.
(37) Adjust C5 (fig. 1) for best front corner.
