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SECTION I -
INTRODUCTION
The Model 701 Electronic
Relay is a sensitive
direct
current voltage
discriminator
which actuates an Electra-magnetic
relay when a pre-
determined voltage level is exceeded,
Its action may be made
either
locking or non-locking
and may be wired so that it is fail-
safe for a signal which exceeds the trip
point or for a signal
which decreases below the trip
point,
,
The Electronic
Relay features
a variable
"Trip Level" from 0.2 to
10 millivolts
with an input,impedence
of 1 megohm. The trip
level
is adjustable
by means of a calibrated
dial on the front panel.
The instrument
is normally furnished
as a volts. e
8
actuated device
but can be used to control
currents down to lo-
amperes by shunt-
ing sn appropriate
resistor
across the input.
The Model 701 differs
from meter type relays in that it employs a
chopper and an amplifying
circuit
to control
to relay.
It thers-
fore offers
considerably
higher sensitivity,
more rugged construc-
tion,
and reliable
non-locking
aa well'as
locking operation,
It
is fail-safe
in that either
chopper or tube failure
will
create
the alarm condition.
On either
locking
or non-locking
opsration
the 701 is chatter-free.
The unit
may
be mounted in the Model 7011
cabinet for convenient portability.
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