Calibration— Type 1A1
(C)
Fig. 7 -1 8 . Waveform displays obtained when checking Add Mode
of operation (step 1 7 ).
17. Check Add Mode Operation
a. Test equipment setup with connections made at com
pletion of step 17d, is shown in Fig. 7-17.
b. Connect a BNC T connector to the Channel 2 INPUT
connector.
c. Connect a 42-inch 50-ohm cable between the oscillo
scope Calibrator Output connector and the BNC T connec
tor.
d. Connect an 18-inch 50-ohm cable from Channel 2 IN
PUT connector to Channel 1 INPUT connector.
e. Adjust the Triggering Level control to obtain a stable
display.
f. CHECK— For two calibrator waveforms, each two cm in
amplitude, displayed on the CRT (see Fig. 7-18A).
g. Set the MODE switch to ADD.
h. CHECK—That with the same amount of calibrator sig
nal applied to both channels of the Type 1A1 as in step
17f, a single calibrator waveform display four cm in ampli
tude is obtained (see Fig. 7-18B).
i. Set Channel 1 PULL FOR INVERT switch to invert.
j. Set the oscilloscope calibrator for an output of 0.5
volt.
k. CHECK—The two signals should differentially cancel
each other out within 0.5 cm (see Fig. 7-18C).
NOTE
If the cancellation just described takes place, set
Channel 1 PULL FOR INVERT switch to normal and
Channel 2 PULL FOR INVERT switch to invert. Now
check fo r proper cancellation. The Type 1A1 is
operating satisfactorily if either condition w ill per
mit proper cancellation o f the signals.
l
. Disconnect the BNC T connector and the 50-ohm coaxial
cables.
m. Set the oscilloscope Amplitude Calibrator switch to
Off.
7-16
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