Calibration—221 Service
c. Check noise on trace, for less than 0.1 division (adjust
INTENSITY and FOCUS fo r a well-defined trace.
20. Check AC COUPLING
a. Connect the 221 oscilloscope to the standard ampli
tude calibrator. Use a probe tip to BNC adapter and a
19. Check Gate Leakage
50-ohm BNC cable.
a. Set the V O LTS/D IV switch to 5 m.
b. Set the amplitude of the standard amplitude cali
brator to 100 volts dc.
b. Connect the probe, through a probe tip to BNC
adapter, to a 50-ohm termination.
c. Set the INPUT COUPLING switch to GND, and
position the trace to center graticule line.
c. Change INPUT COUPLING switch from GND to AC.
d. Set the INPUT COUPLING switch to AC.
d Check fo r a trace shift of less than 0.1 division.
e. Check that the display remains at graticule center
line.
R - i n
n r - , ,
5-10
REV. APR 1974
Содержание 221
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