The isolation amplifier AD-TV 400 GVD serves the galvanic separation of analogue signals and of transmitter signals. When a 2-wire transmitter is connected, this will be supplied directly via a galvanically separated and current-limited supply voltage. All measuring ranges and outputs can be freely parameterized. This can be carried out via the optional operating panel AD-VarioControl or via the programming software AD-Studio. The wide bipolar input measuring range makes this buffer amplifier into the universal type for almost all applications in the area of standard signals and beyond. Due to its current-sinking output, transmitter signals can also be separated or converted. All supply ranges are covered with the wide range power pack.



Amplification, transformation and electrical isolation of current or voltage signals

Specific characteristics

  • bipolar current input (+/- 0,5 mA bis +/- 50 mA)
  • bipolar voltage input (+/- 1 V bis +/- 100 V)
  • Power supply for 2- / 3-wire transmitters
  • bipolar current or voltage output
  • current sink output
  • Operating module as an accessory
  • 23 mm narrow housing with detachable terminal clamp

Business data

Order number
Isolation amplifier AD-TV 400 GVD
Accessory (optional)
Operating module AD-VarioControl
USB programming adapter AD-VarioPass
Configuration software AD-Studio
EClass 27210120
Customs tariff number / country of origin 8543 70 90 / Deutschland


Data sheet pdf en-tv400gvd.pdf (243 kB)
Operation manual VarioControl pdf man-variocontrol-ad-en.pdf (1 MB)
Tender text zip (15 kB)
Safety instructions pdf ad-safety-instructions.pdf (43 kB)

Technical specifications

Input current
Measuring range -50 ... + 50 mA DC
Input resistance 40 Ohm
Input voltage
Measuring range -100 ... + 100 V DC
Input resistance 1 MOhm
Transmitter supply
Off-load voltage 24,5 V
Voltage at 20mA 19,5 V
Current limit ~ 25 mA
Output current
Max. output range -21,5 ... 21,5 mA DC
Max. burden 400 Ohm
Residual ripple 40 µAss
Output voltage
Max. output range -10,5 ... 10,5 V DC
Min. burden 10 kOhm
Residual ripple 30 mVss
Current sink output
Current sink 0/4 ... 20 mA DC
Max. voltage to be applied 35 V DC
Input 16 bit
Output 12 bit
Transmission behaviour
Linearity error 0,2 % of full scale
Rise time 200 ms (output auf 90 %)
Temperature influence +/- 100 ppm/K of full scale
Voltage range AC 50 ... 253 V AC, 50/60 Hz
Nominal voltage AC 230 V AC
Voltage range DC 20 ... 253 V DC
Nominal voltage DC 24 V DC
Power consumption AC / DC 4 VA / 2,4 W
Dimensions (WxHxD) 23x110x134 mm
With operating module (bxhxt) 23x110x138 mm
Type of protection IP 20
Connection method Detachable terminal clamp
Terminals, wire cross section 2,5 mm² flex wire / 4 mm² one wire
Bolting torque terminals 0,5 Nm
Weight ~ 150 g
Manner of fastening 35 mm DIN rail 35mm
Environmental conditions
Ambient temperature -10 ... 50 °C
Storage and transport -10 ... 70 °C (no condensation)
Product family standard 1) EN 61326-1
Emitted interference EN 55011, CISPR11 Cl. B, Gr. 1
1)During electromagnetic disturbance minor changes in output signal are possible.
Electrical safety requirements
Product family standard EN 61010-1
Overvoltage category II
Pollution degree 2
Galvanic isolation, test voltages
Input/output 3,75 kV (1 min)
Signal/auxiliary voltage 4 kV (1 min)

Block and wiring diagram




CAD / CAE Daten

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Display and operating elements

On: LED for operating display in green
on - normal operation
flashing - Signal failure, signal outside range limits

AD-PC: Communication interface for configuration by a PC

Communication interface for VarioControl

Modbus Communication

The optional AD-VarioConnect operating module has an RS-485 interface. The data is transferred via the Modbus RTU protocol, the AD-VarioConnect operating module represents a Modbus slave. Communication takes place according to the master-slave procedure and starts with a request from the master, e.g. from a PLC or a PC. Each bus participant must have a unique address. If a slave detects that its address has been addressed by the master, the slave always sends an answer. The slaves never communicate with each other. They are also not able to start a communication with the master.
The Modbus master can read out the individual registers of the AD-TV 400 GVD via the addresses.
The default standard data format is 19200,e,8,1 with slave address 1. These settings can be changed via the AD-VarioConnect operating module.

Start address Number of registers Name Unit Data type read write

 Measured values:
40805 2 Scaled input 7 1 0
40809 2 Input signal mA / V 7 1 0
40909 2 Output signal 1 mA / V 7 1 1
40911 2 Output signal 2 mA / V 7 1 1

Legend of the datatypes:
U08: 1 S08: 2 U16: 3 S16: 4 U32: 5 S32: 6 float: 7

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