Feature
Specification 

Model  ME435 

Product component type  Handhold polyphase power meter 

Poles description  3PH4W 3PH3W 1PH2W (LN); 1PH2W(LL);1PH3W(LLN) 

Device application  Power analysis Energy meter 

Input type  External Rogowski coil External CT(333mV only) 

Display  3.5 inch TFT screen display 

Sampling rate  8k samples per second 

Harmonic  52th Max 

Mechanical characteristics 
Weight  350g 
Dimension  L*W*D:21.5*10*3.5CM 
Power Meter Characteristics
The power meter measures currents and voltages and reports realtime RMS values for all 3phases and neutral. In addition, the power meter calculates power factor, realpower, reactive power, and more.
The following sections list the metering characteristics of the power meter.
RealTime Measuring
The following table lists the metering characteristics of the power meter for the realtime
measurement:
Characteristics  Description 
Current  Per phase, neutral, and average of 3 phases 
Voltage  LL, LN, and average of 3 phases 
Frequency  45...65 Hz 
Active power  Total and per phase (signed) 
Reactive power  Total and per phase (signed) 
Apparent power  Total and per phase(signed) 
Power factor (True)  Total and per phase 0.000 to 1 (signed) 
Current unbalance  Per phase, most unbalanced of 3 phases 
Voltage unbalance  most unbalanced of 3 phases 
Minimum/Maximum Values
When any onesecond realtime reading reaches its highest or lowest value, the power meter saves the minimum and maximum values in its nonvolatile memory.
From the power meter display, you can:
• view all min./max. values since the last reset and the reset date and time.
• reset min./max. values.
All running min./max. values are arithmetic minimum and maximum values. For example, the minimum phase AN voltage is the lowest value in the range from 0 to 999.9GV that has occurred since last reset of the min./max. values.
The power meter provides time stamping for all minimum/maximum values.
The following table lists the minimum and maximum values stored in the power meter:
Characteristics  Description 
Current  Per phase and average 
Voltage  per phase and average 
Active power  Per phase and total 
Reactive power  Per phase and total 
Apparent power  Per phase and total 
Demand Readings
The power meter provides the following demand readings.
Characteristics  Description 
Current  Per phase and average 
Active, reactive, apparent power  Per phase and Total 
Peak Demand Values 

Current  Per phase and average 
Active, reactive, apparent power  Per phase and Total 
Demand Calculation Methods
Power demand is the energy accumulated during a specified period divided by the length of the period. Current demand is calculated using arithmetical integration of the current RMS values during a time period, divided by the length of the period. How the power meter performs this calculation depends on the selected method. To be compatible with electric utility billing practices, the power meter provides block interval power/current demand calculations.
For block interval demand calculations, you select a block of time (interval) that the power meter uses for the demand calculation and the mode the meter uses to handle he interval. 2 different modes are possible:
• Fixed block  Select an interval from 1 to 60 minutes (in 1 minute increments). The
power meter calculates and updates the demand at the end of each interval.
• Sliding block  Select an interval from 1 to 60 minutes (in 1 minute increments). For demand intervals less than 15 minutes, the value is updated every 15 seconds. For demand intervals of 15 minutes and greater, the demand value is updated every 60 seconds. The power meter displays the demand value for the last completed interval.
The following figures illustrate the 2 ways to calculate demand power using the block
method. For illustration purposes, the interval is set to 15 minutes.
Peak Demand
In nonvolatile memory, the power meter maintains a maximum operating demand value called peak demand. The peak is the highest value (absolute value) for each of these readings since the last reset.
You can reset peak demand values from the power meter display. You should reset peak demand after changes to basic power meter setup such as power system configuration.
Energy Readings
The power meter calculates and stores Per phase and total energy values for active,reactive, and apparent energy.
You can view energy values from the display. The resolution of the energy value automatically changes from kWh to MWh to GWh (kVAh to MVARh to GWh).
The energy values automatically resets to 0 when it reaches the limit of 999.9GWh,
999.9GVAh, or 999.9GVARh.
The following table lists the energy readings from the power meter:
Characteristics  Description 
Energy values 

Active energy  0 to 999.9GWh Auto reset to 0 in case of over limit 
Reactive energy  0 to 999.9GVARh Auto reset to 0 in case of over limit 
Apparent energy  0 to 999.9GVAh Auto reset to 0 in case of over limit 
Power Quality Analysis Values
The power quality analysis values use the following abbreviations:
• Fundamental phase current rms: I1
• Fundamental phase voltage rms: V1
• RMS of up to three harmonics of phase current:
Ix, Iy, Iz, x, y, z = 2, 3,…, N
• RMS of up to three harmonics of phase voltage:
Vx, Vy, Vz, x, y, z = 2, 3,…, N
•Total harmonic distortion of the phase current
• Total harmonic distortion of the phase voltage
• Harmonic distortion of up to three harmonics on the phase
current
• Harmonic distortion of up to three harmonics on the phase
voltage:
THD provides a measure of the total distortion present in a waveform. THD is the ratio of harmonic content to the fundamental and provides a general indication of the quality of a waveform. THD is calculated for both voltage and current.
The following table lists the power quality values of the power meter:
Characteristics  Description 
THD  Per phase current Per phase voltage 
Data Record
The power meter records data to SD card, the following table lists data record of the power meter.
Record 
Record interval  1s to 9999s（default 1min） 
Record format  csv 
Record capacity  Micro SD card 1GB（default） 
Store about 1K Bytes data each time 
record 2 years （1min & 1GB） 
Record data  Date&time, Voltage(V),UTHD(%),Current(A),ITHD (%), ITHD2(%),ITHD3(%), ITHD4(%), ITHD5(%), ITHD6(%), ITHD2(A), ITHD3(A), ITHD4(A), ITHD5(A), ITHD6(A) Frequency(Hz), PF(power factor), Active Power(W),Reactive Power(Var),Apparent Power(Va), Active Energy(Wh),Reactive Energy(Varh),Apparent Energy(Vah) 