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Shunt/mV Isolation Amplifier DS 7400

Isolation and Conversion of mV-Signals in Standard Applications

The Isolation Amplifier DS 7400 is used for separation and conversion mV-signals such as those frequently used for current measuring with shunt-resistors or other applications.

  • Calibrated signal setting
    Input and output range can be set by using DIP switch – without any further adjustment
  • Universal power supply for 20 to 253 V AC/DC
    Applicable world-wide for all common supply voltages
  • 3-port isolation
    Protection against erroneous measurements due to parasitic voltages or ground loops
  • Ultra-small-sized housing
    12.5 mm housing with plug-in screw terminal blocks
  • Maximum reliability
    No maintenance costs
  • 5 Years Warranty
    Defects occurring within 5 years from delivery date shall be remedied free of charge at our plant (carriage and insurance paid by sender)

Its high level of reliability and cost optimized design make the DS 7400 the first choice in its class!

The desired input and output range can be easily set by using DIP switch and due to the calibrated range selection no further adjustment is necessary.

The slim housing with 12.5 mm width saves space in your switch cabinet and facilitates by the practical plug-in screw terminal blocks the assembly.

For range selection a simple housing unblocking is installed which makes it possible to reach easily all control elements also on the DIN-rail.

In cause of the new universal power pack for 20 to 253 V AC/DC the Isolation Amplifier DS 7400 is applicable world-wide for all common supply voltages. To control the power supply a green LED is installed on the front panel.

Product line

Product line DS 7400
Devices Order No.
Shunt/mV Isolation Amplifier DS 7400 AG

Data sheet archive:

The products are no longer available!

Technical Data


Input signals 0 to 60 mV, 0 to 150 mV, calibrated terminal selectable
Input resistance > 25 kOhm
Input capacitance Approx. 1 nF
Overload ≤ 30 V


Output signals 0 to 10 V, 0 to 20 mA, 4 to 20 mA, calibrated switchable
Load Current output
Voltage output
≤ 10 V (500 Ohm at 20 mA)
≤ 10 mA (1 kOhm at 10 V)
Residual ripple < 20 mVrms

General Data

Transmission error < 0.3 % full scale
Temperature coefficient 1) < 150 ppm/K
Cut-off frequency -3 dB 1 kHz
Response time T99 0.7 ms
Test voltage 2.5 kV AC, 50 Hz, 1 min., Input against output against power supply
Working voltage 2)
(Basic Insulation)
600 V AC/DC for overvoltage category II and pollution degree 2
acc. to EN 61010-1
Ambient temperature Operation
Transport and storage
–10 °C to +60 °C   (+14 to +140 °F)
–20 °C to +80 °C   (-4 to +176 °F)
Power supply 20 to 253 V AC/DC AC 48 to 62 Hz, approx. 3 VA
DC approx. 1.5 W
EMC 3) EN 61326-1
Construction 12.5 mm (0.49") housing, protection class: IP 20
mounting on 35 mm DIN rail acc. to EN 60715
Weight Approx. 100 g
  1. Average TC related to full scale value in specified operating temperature range, reference temperature 23 °C
  2. For applications with high working voltages, ensure there is sufficient spacing or isolation from neighboring devices and protection against electric shocks.
  3. Minor deviations possible during interference

Block diagram


Terminal assignments

  • 1 + Input 60 mV
  • 2 − Input 60 mV
  • 3 + Input 150 mV
  • 4 − Input 150 mV
  • 5 + Output
  • 6 − Output
  • 7 Power supply AC/DC
  • 8 Power supply AC/DC

Pluggable screw clamp terminals
Wire cross-section max. 2,5 mm², Multi-wire connection max. 1 mm² (two wires with same cross-section)

Subject to change!

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