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I
I
I
SECTION
VI
ACCESSORIES
6-1.
MODEL
A55 THER
MAL
CO NVERTERS
6-2.
lliTRODUCTION
6-3.
Nine Fluke Model A55 Thermal Converters
(Figure
6-
3) are available with ratings of
0.
5,
1,
2,
3,
5,
10, 20, 30, and 50 volts, each
of
which may
be used
from
1/2
to
1 times the rating. These converters make
possible
extremely accurate
thermal-transfer ac meas-
urements
from sub-audio frequencies to the VHF region.
AC/DC
difference
of
the Model A55 series is compa-
rable to that
of theoretical standards maintained by the
National
Bureau of
Standards.
6-4.
CONSTRUCTION
540B
6-5.
A specially constructed thermocouple, selected
for
frequency characteristics and low DC reversal
error, is the
thermally
responsive element of the
Model
A55 series. AC and de input voltages are applied
di-
rectly across the thermocouple heater on the 0. 5
volt
model. For higher voltages, low temperature coef-
ficient
metal-
film resistors provide the proper range
multipliers.
Figure
6·1
.
MODEL A55 THERMAL CONVERTERS AND ACCESSORIES
6-
1
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