VT1004A | VT1004A FPGA

Load and Measurement Module

The VT1004A  module is connected to up to 4 outputs of an ECU, which are connected to actuators such as servo motors or lamps in real-vehicle operation mode. This module is also available as a variant (VT1004A FPGA) with user programmable FPGA.

Load and Measurement Module: VT1004A | VT1004A FPGA


Functions for Each Channel

  • Various signal paths to the original loads and bus bars are switched via relays. The relays may be used, for example, to generate short circuits to ground or to battery voltage via a bus bar, or to break the line to an original load (broken wire simulation).
  • Relay for short circuits between the input lines
  • Electronic load for predefined current or resistance with electronic overload protection
  • Voltage measurement with calculation of instantaneous, average and effective values
  • Determination of PWM signal parameters (frequency, duty cycle, high and low voltage levels)

Furthermore, it is possible to reverse the two-line connections of the two bus bars via relays (combined for all channels of a module).

Technical Data

  Input voltage -40 V … +40 V
  Continuous current (relay closed) 16 A
  Current ≤ 10s (relay closed) 30 A
  Switched current at voltage ≤ ±18 V 25 A
  Switched current at voltage ≤ ±32.7 V 8 A
  Switched current at voltage ≤ ±40 V 4 A
Electronic Load
  Constant resistance mode  
  – Working range 1.5 … 1,000 Ω
  – Accuracy (resistance ≤ 20 Ω, voltage ≥ ±12 V) ±5 %
  Constant current mode  
  – Working range 0.1 … 10 A
  – Accuracy ±50mA
  Settling time 30 ms
  Load capacity (all channels together) Typ. 30 W
  Peak load ( 2s) Max. 120 W
Voltage Measurement
  Accuracy (at 25 °C) ± (1.2 % + 80 mV)
  A/D converter (per channel, internal) 16 Bit / 250 kSamples/s
  PWM frequency for PWM measurement 20 mHz … 200 kHz
Basic Data
  Supply voltage (via backplane) 12 V ±10 %
  Power consumption (all relays off) Typ. 4.5 W
  Power consumption (12 relays active) Typ. 20 W
  Temperature range 0 … 55 °C
  Dimensions (L x W x H) 300 x 173 x 36 mm
  Weight Approx. 1,150 g


Schematic of one channel of the VT1004A

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