Omega DMD-476 manual Description, Features, Applications, Specifications

Description

The Model DMD-476 is a self contained, AC powered signal conditioner for bridge type instrumentation. It contains a precision instrumentation amplifier with isolated, filtered output and a highly regulated, low noise, adjustable output bridge excitation source. The unit is completely encapsulated for use in rugged environments.

Features

nComplete Strain Gage Bridge Signal Conditioner

nIsolated 4-20 mA or 0-20 mA Output

nOutput Capable of Driving 1000 ohm Loop

nBridge Balance with 80% Tare Offset Capability

nHigh Gain Amplifier; Can Accept Full Scale Live Load Signals as Low as 5 mV and Provide 16 mA Output Span

nExcitation Supply Capable of Driving Four Load Cells

nAC Powered

nRugged Epoxy Encapsulated Design

Applications

nWeighing with Load Cells

nProcess Control Add-on Loops

nCan Be Used With All Types of Low Output Sensors

Specifications

NOTE: Unless otherwise noted, specifications apply after one hour warm up at 25°C ambient. Temperature coefficients apply between 0°C and 55°C ambient.

Isolation

Input to Output	700 VDC
	60pF
Amplifier
Gain
Adjustment Range	5 mV to 50 mV
Input for 4 - 20 mA Output
Linearity	–0.01% of Full Scale
Temperature Stability	50 PPM (0.005%/°C)
Input Noise
.1 Hz to 10 Hz	2 V P-P
Tare Adjustment Range
	-3 mV to +25 mV
Bridge Offset	(Equals 80% F.S. of
	3 mV/V cell)
Input Resistance
Differential and Common Mode	1000 megohm
Common Mode Rejection, DC	100 dB minimum
Common Mode Input	+ 5 Volts
Output
Zero Adjust	0 or 4 mA
Temperature Coefficient	1mA/ C
Current Output Span	4 to 20 mA or 0 to 20 mA
Compliance Voltage	-1 to +20 Volts
Current	-1 mA to +20 mA
Loop Resistance	0 to 1000 ohms
Frequency Response, -3dB	10 Hertz, 2 Pole Roll Off
Response Time
Rise Time 10% to 90%	35 ms
To 0.1% of Final Value	100 ms
Bridge Supply
Voltage Adjustment Range	5 to 10 Volts
Temperature Coefficient	100 PPM Typical
Fixed	10.2V –2.5%
Temperature Coefficient	60 PPM Typical
Load Current	0 to 120 mA
Regulation - Load and Line	0.02% maximum
Output Noise
120 Hz Bandwidth	1 mV RMS, maximum
Power Input	115 VAC, –10V 50/60 Hz
	@ 7 VA
Optional	100, 220 or 230 VAC, –10%
Line Isolation
Capacitance	60 pF
Dielectric Withstand	1100 Volts RMS
Environment
Ambient Operating	-25°C to +55°C
Storage	-25°C to +85°C
Weight	18 oz. (510 grams)
Size	3.75" L x 2.0" W x 2.87" H
	(9.53 cm x 5.1 cm x 7.62 cm)

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