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540B
SECTION
I
INTRODUCTION
AND SPECIFICATIONS
1-1.
INTRODUCTION
1-2.
The Model 540B, together with the Model
A54-1
or
Model A54-2
Voltage Plug-In
Units,
constitutes an
AC-DC
Thermal Transfer Standard.
The
unit has 14
ranges
of
input from 0.5 volts to 1, 000 volts.
It
is
furnished complete with a solid-state galvanometer,
internal
reference, search meter and battery power
supply. A voltage protection circuit protects all in-
ternal circuits from damage as a result of
over-voltages
of
up
to 1, 500
volts
on any range. Since the instrument
does
not require critical positioning or environment,
it
is suitable for application as a Laboratory Standard,
yet hardy enough for
use
as a production line
or
field
instrument.
1-3.
The solid-state galvanometer does not require
special mechanical orientation for proper operation and
is no more
fragile
than any normal meter movement.
The circuit is equipped with an internal calibration cir-
cuit that provides easy and rapid calibration of meter
deflection
sensitivity representing 0. 1% and . 01% at any
input.
1-4.
The
internal reference is adjusted by Coarse,
Medium
and
Fine
controls
that
provide continuous ad-
justment
over the entire range of input levels. Good
resolution
is possible at levels below 50%
of
rated in-
put, but
sensitivity is sacrificed with the lower levels
of input.
1-5.
A search meter
function
has
been
included
which
makes the
selection of
the
operating range certain and
rapid.
1-6.
The self-contained battery pack
will operate the
instrument
independent of power sources.
1-7.
SPECIFICATIONS
1-8.
ELECTRICAL
VOLTAGE
RANGES
0.5,
1,
2, 3, 5, 10, 20, 30, 50, 100, 200, 300, 500
and
1000 volts.
Transfers may be made
on
each range from
1/2
to 1
times
range voltage. Transfers may be made
at
levels
considerably
below the
1/2 of
range
level, but
at
the sacrifice
of
sensitivity.
ACCURACY
Range
Frequency
AC/DC
Difference
All except 1000v
5 Hz
to
50kHz
±.01%
1000v
5
Hz
to
20kHz
±.02%
1000v
20kHz
to
50kHz
±.04%
0. 5 thru 50v
50kHz
to
100kHz
±.05%
20 thru 50v
100kHz
to
500kHz
±0.1%
0.5 thru
10v
100kHz to
1M Hz
±0.1%
100
thru
500v
50kHz
to
100kHz
±0.
2%
CALIBRATION
Each
range is adjusted to
be
within
the
above deviations
from zero as defined by reference standards maintained
by
the John Fluke Standards Laboratory, which are peri-
odically calibrated by
the
National Bureau
of
Standards.
These AC/DC difference specifications do
not
include
the National Bureau of Standards random and syste-
matic error uncertainties. John Fluke Standards Lab-
oratory or
National Bureau of Standards calibration
reports are
available at extra cost.
INPUT IMPEDANCE
182 ohms/volt in all voltage modes.
THERMOCOUPLE REVERSAL ERROR
Less than 0.01% of input at 100% of
rated current
or
voltage.
Less than 0.03% at 50% of rated current or
voltage.
GALVANOMETER
Solid-state electronic type with a
resolution of
0.0012%
of input/scale division at rated
input. 0.006%
of input/
scale division at 1/2 of
rated
input.
SEARCH CIRCUIT
Solid-
state circuit provides
visual.
indication
of
input
voltage as
a percentage of the
voltage
range selected.
OVERLOAD PROTECTION
The entire
instrument
is protected
from
accidental
over-
loads
of up
to
1,
500 vdc or rms ac in any
range.
1-1
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