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Specifications
Gain: Choice of 7 fixed
gains: 1, 2, 5, 10, 25, 50
or 100 V/V, settable by
means of an externally
accessible rotary selector
switch; in addition, an eighth switch position connects a selfcontained potentiometer for continuously variable gains
between 5 and 100 V/V
Input Impedance: 1 mΩ for any gain setting
Frequency Response: DC to 100 Hz at a gain setting of
100 with higher frequency response at lower gain settings
Output: -
5
⁄8 to + 11⁄4 Vdc into 1000 Ω(or greater) load (can be
used with any CJ unit)
Noise: Equivalent noise input, 5 microvolts RMS (equals
500 microvolts RMS output at 100 gain setting)
Zeroing: Output may be offset up to ±1/10 V at all gain settings
except unity; OMNI-AMP
TM
is factory-zeroed at unity gain
Temperature Coefficient: ±5 microvolts/°F as seen at input from
30 to 65°F; ±3 microvolts/°F as seen at input from 65 to 100°F
Battery Life: 100 hours or more at maximum output
(72°F ambient)
Battery Test: Light emitting diode will glow to indicate good
batteries when test button is pressed
Batteries: Two CJ-BATT-B (included)
Size: 19 x 44 x 133 mm (1.75 x 1.75 x 5.25")
Weight: 227 g (8 oz)
Features
Stability: Assured through use of precision metal film
resistors, integrated circuits and gold contact switching
Feedback Gain Control: Stability and accuracy are
not compromised by the use of an input attenuator
Output: May be short circuited without damage
Input: Overloads up to ±2
1
⁄2 V can be tolerated
without damage
N
OMNI-AMP™ I
Thermocouple
Amplifier
OMNI-AMP I, $175,
shown smaller than
actual size.
OMNI-AMPTMI
$
175
OMEGA's®portable thermocouple signal amplifier
is designed to multiply small voltage signals. The
output can be used directly by most readouts, such as
panel meters, strip chart and x-y recorders,
multimeters, multiplexers, and for input to control
systems.
Minute thermocouple output signals can be multiplied
up to 100 times to drive meters or instruments which
otherwise are not sensitive enough to be driven
directly by the small output voltage of a thermocouple.
This small, compact, completely self-contained high
gain amplifier can be instantly employed in a
thermocouple circuit either at the thermocouple
or at the readout device having 1000 Ω or
greater input impedance.
This small and powerful amplifier can be used with all
thermocouple alloy combinations to boost output
voltage. It can be placed directly at the thermocouple
element output quick-disconnect jack or anywhere in
the circuit between the thermocouple and the readout
device. It is intended primarily for use with inexpensive
moving coil meter devices.
Where cold junction compensation is required, the
amplifier can be plugged directly into an OMEGA
®
CJ (Cold Junction Compensator) which is housed in
a similar companion package. Also see Section K of
this catalog for more details on reference and cold
junction compensators used with this amplifier. The
amplifier is available in a laboratory version with
built-in ice point compensation.
The amplifier is also designed to be used where
thermocouple meter or pyrometer input impedance
limits the thermocouple lead length or total circuit
resistance of a thermocouple system. For example,
many thermocouple readout meters or pyrometers
require that the thermocouple circuit impedance be
10 Ω or less and matched to the meter. With this
amplifier in the circuit set at unity gain, the input
resistance of the thermocouple circuit is virtually
independent of the readout device. Thus, with a 1
to 1 amplification setting, thermocouple leads up
to
1
⁄4 mile long can be used where previously only
short lead lengths were tolerated. Also, very fine
gage thermocouples having fast response but
high resistance can now be used with great ease.
N-40
THERMOCOUPLE
INPUT
OUTPUT
ON
ZERO ADJUST
OFF
BATTERY
TEST
AMPLIFIER
GAIN
AGAINST
NETWORK
+
–
To Order
(Specify Model Number)
Model No. Price Description
OMNI-AMPTMI $175.00 Thermocouple amplifier
CJ-BATT-B 3.40 Extra 3V lithium battery
AVAILABLE FOR FAST DELIVERY!
⻬ May Be Used With CJ Series
Cold Junction Compensator
(See Section K)
⻬ Jumper Jack Enables Connectivity
With Any Readout Device
Comes with quick disconnect male plug, banana jack adaptor,
and two 3V lithium batteries.
Ordering Example: OMNI-AMPI, thermocouple amplifier, $175.
Page 2
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