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MODEL 150A
SECTION I - INTRODUCTION
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The Model 150A
Microvolt-Ammeter
is
a stable,
versatile
instrument
for
measuring
extremely
low level
DC signals.
It
functions
as a
voltmeter
from one microvolt
to one volt
full
scale,
and as an
ammeter from one milliampere
to one hundred
micro-microamperes
full
scale.
It
also
operates
as a DC amplifier
with
gains
up to
ten million
for
driving
recorders.
The very
low noise
level
of the Model 150A, together
with
its
long
term stability
make it
ideal
for
many measurements
requiring
ex-
treme power sensitivity.
Typical
applications
include
measuring
the output
from strain
gages,
thermopiles,
thermocouples,
bolometers,
phototubes,
ionization
chambers,
scintillation
counters,
and barrier
layer
cells.
Other
apnlications
are found
in cell
studies,
measurement
of electrochemical
potentials,
electrolytic
corrosion
studies,
molecular
weight
analysis
and Hall
effect
studies.
In addition
to its
use as a direct
indicator
of minute
potentials
and currents,
the Model 150A may also
be used as a null
detector
in
Wheatstone
or Mueller
bridges,
or with
an external
voltage
source
as
a meg-megohmmeter.
An important
feature
of the instrument
is zero supnression
up to
100 times
full
scale,
in place
of the usual
more limited
meter
zero.
This
permits
measurements
of small
signals
in the presence
of large
thermal
EMF's or other
masking
DC signals.
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