TB 9-6625-2139-35
(a) CH 2 VOLTS/DIV switch to 2m.
(b) A AND B SEC/DIV switches to .2 ms.
(c) CH 2 POSITION control to view waveform.
(61) Adjust R76 (fig. 1) for 5 divisions of vertical deflection on TI (R).
(62) Set CH 2 VOLTS/DIV switch to 10m.
(63) Set oscilloscope calibrator output to 50 mV.
(64) Adjust R195 (fig. 1) for 5 divisions of vertical deflection on TI (R).
(65) Connect oscilloscope calibrator CHAN 1 to TI CH 2 using a 5-80 pF
standardizer.
(66) Set oscilloscope calibrator EDGE output to 1 kHz and amplitude for 5 divisions
of vertical defection on TI.
(67) Adjust 5-80 pF standardizer for optimum square wave.
(68) Set CH 2 VOLTS/DIV switch to .1.
(69) Replace 5-80 pF standardizer with 50Ω feedthrough termination.
(70) Set oscilloscope calibrator amplitude for 5 divisions of vertical deflection on TI.
(71) Adjust C62 (fig. 1) for best front corner.
(72) Replace the 50Ω feedthrough termination with a 5-80 pF standardizer and
repeat (70) above.
(73) Adjust C61 (fig. 1) for best flat top.
(74) Repeat (69) through (73) above until no further improvement is noted.
(75) Set CH 2 VOLTS/DIV switch to 1.
(76) Remove 5-80 pF standardizer and connect oscilloscope calibrator CHAN 1 to TI
CH 2. Repeat (70) above.
(77) Adjust C55 (fig. 1) for best front corner.
(78) Connect oscilloscope calibrator CHAN 1 to TI CH 2 using a 5-80 pF
standardizer and repeat (70) above.
(79) Adjust C54 (fig. 1) for best flat top.
(80) Repeat (76) through (79) above until no further improvement is noted.
(81) Position controls as listed in (a) through (c) below:
(a) VERTICAL MODE CH 1 BOTH CH 2 switch to CH 1.
(b) CH 1 and CH 2 VOLTS/DIV switches to 10 m.
(c) A AND B SEC/DIV switch to .05 s.
(82) Connect oscilloscope calibrator CHAN 1 to TI CH 1 using a 10X attenuator and
a 50Ω feedthrough termination.
(83) Set oscilloscope calibrator EDGE output to 1 MHz and amplitude for 5 divisions
of vertical deflection on TI.
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