Schneider Electric HRB1684301-01 Manual De Usuario

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HRB1684301-01

Chapter 15—Verifying accuracy

PowerLogic™ PM5500 series user manual

6. Depending on the method selected for counting the energy pulses, configure the 

meter’s alarm / energy LED or one of the digital outputs to perform energy pulsing. 
Set the meter’s energy pulse constant so it is in sync with the reference test 
equipment.

7. Perform accuracy verification on the test points. Run each test point for at least 30 

seconds to allow the test bench equipment to read an adequate number of pulses. 
Allow 10 seconds of dwell time between test points.

The reference test equipment typically requires you to specify the number of pulses 
required for a test duration of “t” seconds. Normally, the number of pulses required is at 
least 25 pulses, and the test duration is greater than 30 seconds.

Use the following formula to calculate the required number of pulses:

Where:

•

Ptot = total instantaneous power in kilowatts (kW)

•

K = the meter’s pulse constant setting, in pulses per kWh

•

t = test duration, in seconds (typically greater than 30 seconds)

The test voltage and current source supplies the same test signals to both the energy 
reference/standard and the meter under test. Total power is calculated as follows:

For a balanced 3-phase Wye system:

NOTE: A balanced 3-phase system assumes the voltage, current and power factor 
values are the same for all phases.

For a single-phase system:

Where:

•

Ptot = total instantaneous power in kilowatts (kW)

•

VLN = test point line-to-neutral voltage in volts [V]

•

I = test point current in amps [A]

•

PF = power factor

The result of the calculation is rounded up to the nearest integer.

For every test point:

Number of pulses 

Ptot K



t

3600

------------



=

Ptot

3 VLN I PF







1 kW

1000 W

-------------------



=

Ptot

VLN I



PF

1 kW

1000 W

-------------------





=

Energy Error

EM ES

–

ES

---------------------- 100



%

=