Edit Password (Pwd); Meter Information (Info); Power Analysis Values; Total Harmonic Distortion Measurement - Delta DPM-C501L Operation Manual

4.2.9

Edit Password (PWD)


Edit the password (default 0000)

Steps:
1. Press NEXT key till the first digit starts blinking
2. Use UP and DOWN keys to select the first digit of the password
3. Press NEXT key to confirm the setting and start to set the next digital input.
4. Repeat steps 2-3 till you complete the setting of the 4 digit password.
5. Press NEXT key to confirm the setting.
Note: You can go back to the previous setting item by pressing BACK key anytime, whether you have
completed or canceled the setting.

4.2.10 Meter Information (INFO)


Model: C501L or C502

Firmware version: 1XXXX

Firmware release date: YYYYMMDD

4.3 Power Analysis Values

4.3.1 Total Harmonic Distortion Measurement

The total harmonic distortion (THD) is a measurement of the harmonic distortion and is defined as the ratio
between the power of the harmonic frequencies above the base frequency and the power of the base frequency.
The total harmonic distortions for current/voltage are calculated using the following formula.
Total Harmonic
Distortion for Current
Total Harmonic
Distortion for Voltage
4.3.2

Demand Calculation Method (only available for DPM-C502)

The power meter provides measured values for current demand, active power demand, reactive power
demand and apparent power demand. You can also calculate the last, present, predicted and peak demand
values from above measured values.
Fixed block interval demand method
Select an interval from 1 to 60 minutes (in 1-minute increments). Take a fifteen-minute interval as the example
shown below. The power meter calculates and updates the demand at the end of each interval. The present,
predicted and peak demand values are updated every second, the last demand value is updated at the end of
the interval and is treated as the present demand after update.
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