Signal Conditioning Board for Voltage & Current Measurement using DSP/FPGA/MCU

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This signal conditioning unit offers an extensive and powerful set of measurements to check power distribution systems. Some give a general impression of power system performance. Others are used to investigate specific details. This manual gives an overview on how to perform measurements in a logical order.

This unit is designed to measure voltage and load current of all three phases. These parameters are tuned to provide these data to DSP, FPGA or Microcontrollers. The three Hall Effect sensors placed in this plays a major role for load current measurement. These load currents are converted in terms of voltage using this signal conditioning unit.

Voltage rating:

• Input voltage – 0-230 VAC
• Output voltage – 0-3 VAC
• Quantity of the unit – 3 NOS

Current rating:

• Input current – 0-20 AMP AC/DC
• Output current in terms of voltage – 0-3 VOLTS AC/DC
• Quantity of the unit – 3 NOS

Unit operating power:

• Voltage – +15, -15, +5
• Current – 1A

Transformer Details

• For unit operation – (0-230) / (12-0-12) VAC/1A – 1Nos
• For Reference voltage of three phase – (0-230) / (0-9) VAC/700mA – 3Nos

• NT25-P Current Transducer

• Electrical data:

• Normal current IPN : 25A rms
• Measuring range IP : 0~±80A
• Secondary nominal output : 2.5V ± 0.625V
• Ratio : 1：2000
• Load resistance RL : ≥ 2k Ω
• Supply voltage : +5(1 ±5%)V
• Current consumption (&commat;+5V) : ≤30 mA
• Isolation: Between primary and secondary: 3kV /50Hz/1min

Accuracy – Dynamic performance data:

• Accuracy : X &commat;IPN, TA=+25ºC ±0.7%
• Non-linearity : ≤ 0.1%
• Offset of zero current : 2.5V ± 0.025V （+25 º C）
• Thermal drift : &commat; -10º C∼ +85º C： ≤ 100ppm/ ºC
: @-40º C~-10º C： ≤ 150ppm/ ºC
• Response time : ≤400ns
• di/dt accurately followed : ≥15A/us

General data:

• Operating temperature : -40 º C~+85º C
• Storage temperature : -40 º C ~ +100 º C
• Weight : ≤11g
• Standards : EN50178:1997