Section 3
OM6634A-B-02
4 January 2019
3-2
and P2. Set the ohmmeter to the best range for measuring 112
with an excitation
current of 1 mA or less. Measure the resistance of the PRT (
R
t
). The change in internal
chamber temperature from the previously measured resistance value:
(
)
C
R
R
t
o
t
−
=
392
.
0
Where Ro is the previously measured resistance value.
Figure 3-1: Opening the Power Receptacle
Check to see that the fuses inserted in the receptacle correspond to the correct type specified in
Section 1.4.1 Line Input Connector
100V
120V
220V
240V
100V
120V
220V
240V
EXPOSE LINE SELECTOR SLIDER
REMOVE SELECTOR (120V SHOWN)
PRY HERE TO REMOVE COVER
ROTATE SELECTOR AND REPOSITION
SLIDER TO DESIRED LINE INPUT
(240V SHOWN) AND REINSERT
REPLACE COVER
DISCONNECT POWER
Summary of Contents for 6634A Resistance Standard
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