Model 456A
Section
I
Paragraph 1-1
SECTION I
G ENER AL INF OR MATION
1 -1.
GE N ERAL DES CRIP TIO N.
The Model
456A
is a n ins trume nt for measuring ac
cu rrent.
It
consists of a probe and amplifier. and is
used together with an associated voltmeter or oscil
loscope (see figure 1- 1).
Figure
I-I.
General Arrangement of Model
4 56A
Cur rent is measu red by merely clamping the probe of
the
Model
4S6A
a
round the current carrying conductor.
The probe operates w ith an ac companying small ampli
fier to convert the ac current being measured to a pro
portional voltage. The current- to-voltage con version
factor is
1
millivolt output for 1 milliampere flow ing
th rough the probe. Cu rrent readings can thus be taken
directly from the voltage calibra tions on the voltmeter
or oscilloscope. Table 1-2 is a list of
�
instruments
w hich can be used with the p robe.
Table 1-2.
�
lnstruments for use with
456A
AC C urrent Probe
Voltmeters
400D
400H
400L
403A
Wa ve Analyzer
302A
jJ
Oscilloscopes
120A
122A
13
0
8
IS0A
1608
170A
Figure
1-2.
Model
456A
AC C urrent Probe
00395-1
1-1
