美國 Meriam VMA0055 電壓和電流測量和模擬模塊
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簡介：美國 Meriam VMA0055 電壓和電流測量和模擬模塊的詳細介紹 Consider the following advantages for MFT users: Power a transmitter directly from V...
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美國 Meriam VMA0055 電壓和電流測量和模擬模塊的詳細介紹
Consider the following advantages for MFT users:
Power a transmitter directly from VMA
Use MFT 4000, 4005 & 4010 to calibrate transmitters anywhere, anytime
Concurrently use MFT base unit to check transmitter input (P, T, V, i) and 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 valve 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
DC Voltage/Current Measurement and simulation Module
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 convenient field 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 or calibration activities. 12 VMA0055 Advantages 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.
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
Ordering InformationModel Numbers
VMA0055-11-1 VMA Module
Accessories
ZA900529-00015 VMA Test Lead Kit: banana plugs on 9” breakouts (both ends), assorted connectors
(recommended for source and simulate functions)
Notes
1. Nominal resistance at VMA current terminal is 10 – 15 Ω
2. Output load line is linear
3. Unit operating time de-rated at high temp and high current as follows:
Continuous operation @ 50ºC and 20mA
15 minutes typical @ 50ºC and 24mA (unit will shut down to prevent thermal damage)
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
