VMA0055 Voltage, Current Measure & Simulate and 24 V DC
Isolated Loop Power for MFT 4000 Series Calibrator 

The VMA0055 is a DC voltage and current measurement and simulation module for use with the Meriam MFT 4000 Series Multi-Function Tester. The module features the functionality of a DVM and loop calibrator for terrific versatility. When used with other MFT functions, the VMA / MFT combination provides valuable functionality not available in other devices. Measurement ranges include ±500 mV, ±55 V, and ±100 mA. Sourcing capabilities include ±1000 mV, 0 - 24 V and 0 - 22 mA. The VMA module will also simulate transmitter outputs when connected to a loop or it can be used to temporarily supply 24V DC loop power to unpowered devices during commissioning, outages or calibration activities.

VMA0055 goes far beyond the ±50 volts / mA measurement capability of the MFT base unit and has its own isolated power supply so common ground problems are not an issue. Consider the following advantages for MFT users:

• Power a transmitter directly from VMA
  Use MFT 4000 and 4010 to calibrate transmitters anywhere, anytime
  Concurrently use MFT base unit V / mA meter to simultaneously check transmitter output
  Use MFT 4010 HART communications to commission or reconfigure unpowered transmitters


• Measure mV, V or mA as you would with a DVM
  Reduce the number of tools the technician carries
  Resolution to 1/100,000 counts
  Select desired V range for best possible accuracy


• Source precise voltage or mA signals to check calibration or operation of receiving devices or step a positioner
  Key in exact output value desired
  Increase or Decrease output value by predefined increments
  Auto-step tests are user defined for start and stop values, number of steps, dwell time, and manual or automatic advance


• Read volts or mA from MFT meter while sourcing volts or mA from VMA module
  Test input isolation buffers with one MFT; apply mA value to buffer input with VMA and measure mA value output of buffer
  Select mA or V measurement on MFT meter from the VMA output display without interruption of output


• Simulate transmitter output in externally powered loop VMA modulates loop current to any selected value
  Increase or Decrease simulated value by predefined increments
  Auto-step tests are user defined for start and stop values, number of steps, dwell time, and manual or automatic advance


• I/P Device and switch testing
  Combined with a pressure module, perform I/P testing
  Use VMA power source to wet switch contacts and use pressure and temperature modules for pressure and temperature switch testing


• Available certifications include:
  CE Mark
  NIST traceable - standard
  Intrinsically Safe - MET Laboratories per CSA C22.2 & UL 913 Class I Division I, Groups A, B, C & D


• Approvals
  Intrinsically Safe Certification from MET Laboratories. MET Laboratories is a Nationally Recognized Test Lab (NRTL). The module is certified by MET Laboratories to comply with standards CSA C22.2 No.1010.1, CSA C22.2 No. 157-92, and UL913 Fifth Edition Rev 2/21/97 for Class I, Division I, Groups A, B, C, and D, T5 hazardous areas. Restrictions apply - see the Intrinsically Safe Control Drawing shipped with each MFT Modular Calibrator for more details.


• Resolution, Range, and Accuracy Specification for VMA0055 Module
  Ambient temperature limits: -10° C to +50° C
  Accuracy statements are for ambient temperatures of 18° C to 28° C
  Apply the Temperature Coefficient for ambient temperatures below 18° C and above 28° C