Instrument Options—455/A2/B2
OPTION 4
The 455 Option 4 oscilloscope is modified to meet the EMC requirements of MIL-STD-461A when tested in accordance
with the following test methods of MIL-STD-462:
CE-01, CE-03, CS-01, CS-02, CS-06,
RE-02 (limited to 1 GHz), (T) RE-04,
RS-01, and RS-03 (limited to 1 GHz).
The following additions and changes are made to the standard 455 to meet the Option 4 specification requirements:
a. Three capacitors added across the power transformer secondary windings. Refer to Fig. 1.
b. EMI filter added in series with the ac-line cord.
c. The insides of both top and bottom cabinet sections coated with a metallic paint to provide shielding.
S701
LINE
VOLTAGE
SELECTOR
T700
C707
.005
C708
.01
x
C709
.01
br
P700
1907-60
Fig. Option 4-1. Partial Power Supply diagram.
REV. B, APR. 1977
Option 4 Page 1
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