Performance Check— Type 1A1
15. Check High-Frequency Compensation at
.05 volts/cm (Both Channels)
a.
Requirement— Optimum response to a fast-rise square-
wave. Waveform must be flat with no more than 4% roll
off or overshoot.
b. Set the equipment controls as follows:
Control Settings
Type 1A1
MODE
POSITION
(both channels)
PULL FOR INVERT
(both channels)
VARIABLE (VOLTS/CM)
VOLTS/CM
(both channels)
CH 2
Near Midrange
Normal or in
CALIB
.05
INPUT SELECTOR
DC
(both channels)
Type 547 Oscilloscope
Time/Cm
5 ju.Sec
Type 106 Square-Wave Generator
Repetition Rate Range
Multiplier
Symmetry
Amplitude
Hi Amplitude Fast Rise
switch
+ Transition Amplitude
— Transition Amplitude
100 kHz
1
Midrange
Not applicable
Fast Rise
Near minimum
Not applicable
c.
Apply the 100 kHz fast-rise signal from the +O utput
connector on the Type 106 through a 5-ns cable and 50-ohm
in-line termination to the Type 1A1 Channel 1 INPUT con
nector.
d. Set the Type 106 -(-Transition Amplitude control to
obtain a 4-cm amplitude display. Set the Symmetry control
to obtain a symmetrical waveform and, if necessary, adjust
the Multiplier control to obtain the 100 kHz output repetition
rate. Use the Type 1A1 Channel 1 POSITION control to
center the display.
e. Set the oscilloscope Time/Cm switch to .1 /tSec.
f. Use the oscilloscope Horizontal Position and Type 1A1
Channel 1 POSITION controls to move the waveform near
the location shown in Fig. 6-4.
g. CHECK— Channel 1 CRT display for optimum square
corner (see Fig. 6-4A). Ringing, rounding, overshoot and
tilt should not be more than 1.6 mm (or 4%) peak to peak
when a 4-cm positive-going square wave is displayed.
h. Disconnect the signal from Channel 1 INPUT connector
and connect the signal to the Channel 2 INPUT connector.
Set the MODE switch to CH 2.
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Sweep Rate:
0.1
f i
sec/cm
(A ) Channel 1.
Fig. 6 -4 . Typical Channel 1 and Channel 2 waveforms of high-
frequency response at a vertical deflection factor of 0 .0 5 volts/cm.
tilt should not exceed 1.6 mm (or 4%) peak to peak for
4-cm amplitude display.
j.
Set the MODE switch to CH 1 and connect the Type 106
Generator to the Channel 1 INPUT connector.
16. Check High-Frequency Compensation at
.005 Volts/Cm (Both Channels)
a. Insert a 10X attenuator between the Type 106 -
1
-O ut
put connector and the 5-ns cable. Set the Type 1A1 Channel
1 VOLTS/CM switch to .005.
b. If necessary, set the Type 106 -(-Transition Amplitude
control to obtain a 4-cm display. Check that the waveform
is positioned near the location shown in Fig. 6-5a.
c. CHECK— Channel 1 CRT display for optimum square
corner (see Fig. 6-5A). Ringing, rounding, overshoot and tilt
should not exceed 1.6 mm (or 4%) peak to peak for a 4-cm
amplitude display.
d. Disconnect the signal from the Channel 1 INPUT con
nector.
e. Set the MODE switch to CH 2 and the Channel 2
VOLTS/CM switch to .005.
f. Check that the waveform is 4 cm in amplitude and
positioned to the same location as described for the previous
channel.
i.
CHECK— Channel 2 CRT display for optimum square
corner ((see Fig. 6-4B). Ringing, rounding, overshoot and
g.
CHECK— Channel 2 CRT display for optimum square
corner (see Fig. 6-5B). Ringing, rounding, overshoot and tilt
© 2
6-7
