3 Phases Digital Power Meter

 

1. Basic Understanding of Equipment

1.1 Key Technical Specifications

Parameters	Note
Voltage Range	1000 V (Settings: 1000 V, 600 V, 300 V, 150 V, 60 V, 30 V)
Current Range	50A (Settings: 50A, 20A, 10A, 5A, 2A, 1A)
Input Impedance	Voltage input impedance is approximately 2 MΩ; low-range current input impedance is approximately 4 mΩ.
Measurable Voltage Parameters	Urms: True RMS; Umn: Rectified average calibrated to RMS; Udc: Simple average; Urmn: Rectified average; Uac: AC component
Measurable Current Parameters	Irms: True RMS; Imn: Rectified average value calibrated to RMS; Idc: Simple average; Irmn: Rectified average; Iac: AC component
Other parameters that can be measured	Cumulative energy, cumulative ampere-hours, energy time, harmonics, active power, apparent power, reactive power, power factor, phase difference, frequency, U+pk, U-pk, I+pk, I-pk, P+pk, P-pk, peak factor, WP, WP+, WP-, q, q+, q- …

1.2 Equipment Configuration Verification

1.2.1 Unpacking

When unpacking the device, handle it gently to avoid scratching the casing with sharp tools. After unpacking, first inspect the exterior of the device to ensure there is no visible deformation or dents, and that the buttons are not damaged or loose. If you notice any abnormalities with the device or its accessories, do not turn it on. Please contact us immediately.

1.2.2 Main Unit and Accessories

Number	Note
①	LS8930 Host
②	Power Cord
③	USB Cable
④	RS-485 communication cable, spare
⑤	RS-232 communication cable, spare

1.2.3 Downloading Electronic Documents

We have already sent download links for the electronic user manual, software, warranty card, and other materials via email at the time of shipment. Please download them as soon as possible. If you missed the email, please feel free to contact us to request the download links again.

2. Safety Precautions

2.1 Electrical Safety

Before connecting the power cord, verify that the supply voltage is between AC 100 V and 240 V, with a frequency of 50 Hz or 60 Hz. You must use a three-prong outlet with a protective ground, and the protective ground resistance must be ≤4 Ω. Never cut or disconnect the protective ground wire, as doing so poses a risk of electric shock.

2.2 Environmental Safety

Do not use in environments with flammable or explosive substances, strong electromagnetic interference, high temperatures and humidity, or excessive dust levels. Operating environment: Temperature 5°C to 35°C, relative humidity ≤ 65% RH.

2.3 Operational Safety

Before wiring, the power to both the meter and the device under test must be turned off; wiring while the circuit is energized is strictly prohibited. Connect voltage wires in parallel and current wires in series; under no circumstances should a current circuit be connected to a voltage terminal or a voltage circuit to a current terminal. After wiring, tighten the terminals and ensure that no bare wires are exposed to prevent short circuits or electric shock.

Do not apply voltages or currents that exceed the rated range.

3. Equipment Overview and Usage

3.1 Introduction to the Back Panel and Wiring

3.1.1 Introduction to the Back Panel

Number	Note
①	Power Cord Jack
②	Input Unit 1 Current Input Terminal
③	Input Unit 1 Voltage Input Terminal
④	Input Unit 2 Current Input Terminal
⑤	Voltage Input Terminal of Input Unit 2
⑥	Input Unit 3 Current Input Terminal
⑦	Voltage Input Terminal of Input Unit 3
⑧	RS232/RS485 interface, spare
⑨	USB port
⑩	Ethernet port, spare

3.1.2 Input Module Wiring Diagram

Single-phase, two-wire (1P2W), connected to input unit 1:

Three-phase, four-wire (3P4W), connected to input terminals 1, 2, and 3:

Three Voltages, Three Currents (3V3A):

Three-phase, three-wire (3P3W), connected to input terminals 1 and 3:

Single-phase, three-wire (1P3W), connected to input terminals 1 and 3:

3.2 Introduction to the Front Panel

Number	Note
①	The wiring configuration display shows the default three-phase, four-wire system. This must match the actual wiring configuration on the back panel. Press the ② wiring button, then use ③ to select the correct wiring configuration, and finally press the ④ confirm button to confirm.
⑤	The three windows on the left display three-phase voltage by default; you can switch to display other parameters using the “Unit” and “Function” buttons at position ⑥.
⑦	By default, the four windows on the right display the three-phase current and total power. You can switch to display other parameters using the unit and function keys located to the right of each window, as shown at ⑧.

4. Using the Software

4.1 Preparations

Connect the device to the computer using a USB cable. Open Device Manager on your computer; if you see the following ports listed, communication is working properly.

4.2 Software Overview

4.2.1 Software Startup Screen

Number	Note
①	Select the correct port number based on the ports displayed in Device Manager.
②	Tap to start recording data, then tap again to stop recording.
③	You can export all data from the current record to an Excel spreadsheet.
④	Harmonic Features
⑤	Data Calculation Features
⑥	Exit the Software

4.2.2 Harmonic Function Interface

Number	Note
①	Click to Read Harmonic Data
②	Progress Bar
③	Message: Read successful
④	You can export the current harmonic data to an Excel spreadsheet.
⑤	Return to the Home Screen

4.2.3 Data Calculation Interface

Number	Note
①	Select “Clear,” press the Settings button, and past data will be automatically cleared.
②	Settings button
③	After clearing is successful, the mode automatically switches to Start; tap the Settings button again to automatically switch to Stop.
④	The device begins recording data
⑤	To stop, tap “Settings” again. The device will record and calculate the relevant data for this period.

Number	Note
①	Click to retrieve the relevant data into the software
②	Retrieval successful
③	You can export the current data to an Excel spreadsheet.
④	Return to the Home Screen

5. Daily Maintenance and Care of Equipment

5.1 Routine Maintenance

5.1.1 Daily Cleaning

Be sure to turn off the power and unplug the power cord before cleaning. We recommend wiping the unit with a soft, antistatic cotton cloth and a mild detergent; do not spray liquids directly onto the unit. Do not use chemical solvents such as benzene, toluene, or acetone.

5.1.2 Routine Inspections

Before each use, check that the power cord and terminal connections are secure and free of burn marks; ensure that the ventilation openings are not blocked; and after turning on the unit, verify that the indicator lights and display are functioning properly.

5.2 Storage Specifications

For long-term storage, keep the product in a dry, dust-free, well-ventilated, and non-corrosive environment at a temperature of 5°C to 35°C and a relative humidity of ≤65% RH.

Turn off the power and unplug all cables; clean the equipment and wrap it in dust-proof film; turn on the power for 10 minutes each month to prevent moisture damage to the components.

6. Troubleshooting and Resolving Common Problems

Fault Symptoms	Possible Causes	Procedure
Large Deviation in Measurement Values	Wiring error; the actual wiring configuration does not match the wiring configuration selected on the device’s front panel	Be sure to refer to Section 3.1.2 for the wiring scheme; be sure to refer to Section 3.2 when selecting the front panel wiring scheme.
Button not working	Keyboard is locked	Press SHIFT+HARMO (i.e., KEY PROT) to unlock the keyboard

7. Packing List

No.	Name	Quantity
①	LS8930 Host	1 unit
②	Power Cord	1 piece
③	USB Cable	1 piece
④	RS-485 Communication Cable	1 piece
⑤	RS-232 Communication Cable	1 piece

Appendix A: Indicator Lights and Label Descriptions

Unit Indicator Light Descriptions

The m (mill), k (kilo), and M (giga) indicators are order-of-magnitude indicators: 1M = 1000k, 1k = 1000, 1m = 0.001

Indicator light	Parameters	Unit
V	Voltage	volt
A	Current	Ampere
W	Active Power	Tile
VA	Apparent Power	volt-ampere
Var	Reactive power	Tired
Hz	Frequency	Hertz
PF	Power Factor
TIME	Time	Hour: Minute: Second
pk	Can be combined to form a peak	Determined by the group
h/h+	Can be combined to form kilowatt-hours	Time
%	Relative Harmonic Content
o	Phase difference	Degree
1	Unit 1
2	Unit 2
3	Unit 3
Σ	Integrated Unit

Status Indicator Light

Indicator light	Note	Notes
UPDATE	Operating Status Indicator Light	A steady light indicates normal operation; a flashing light indicates that data is being updated.
STORE	Storage Operation Indicator Light	A steady light indicates that the device is saving data; a flashing light indicates that data has been saved once.
SCALING	Magnification On Indicator Light	When the light is on, it indicates that the magnification is enabled; use the magnification data for calculations.
RMS	Mode Indicator Light	A lit indicator indicates that the calculated data is the effective value of the signal.
AC	Mode Indicator Light	When the light is on, it indicates that the calculated data represents the AC component of the signal.
DC	Mode Indicator Light	A lit indicator shows that the calculated data is the simple average of the signals.
V-MEAN	Mode Indicator Light	The voltage calculation data indicated by the lit light represents the rectified average value calibrated to the effective value.
KEYPROT	Button Protection	A lit indicator means the button is locked and will not respond.
AVG	Average Data Indicator	A lit indicator means that the calculated value is the average of multiple data points.
VOLTAGE	Voltage Range Indicator Light
CURRENT	Current Range Indicator Light
AUTO	Voltage or Current Auto-Range Indicator Light	When the light is on, it indicates that the voltage or current is within the range and is being automatically detected.
3P4W	Wire-type indicator light	The indicator light shows that the meter is a three-phase, four-wire system.
3V3A	Wire-type indicator light	The “Light On” Indicator Instrument Uses the 3-Voltage, 3-Current Meter Method
3P3W	Wire-type indicator light	The indicator light shows that the meter is a three-phase, three-wire system.
1P3W	Wire-type indicator light	The indicator light shows that the meter is single-phase, 3-wire.

Button Indicator Light

Indicator light	Note	Notes
MAXHOLD	Maximum Value Indicator	When the light is on, it indicates that some of the calculated data values are at their maximum.
HOLD	Data Retention	A lit light indicates that the calculated data is held, meaning the data is no longer being updated.
START	Points Accumulation Start Indicator Light	When the light comes on, it indicates that the accumulation of points has begun.
STOP	Point Accumulation Stop Indicator Light	When the light comes on, it indicates that integration has stopped.
L-FILTER	Line Filter Indicator Light	A lit light indicates that the filter is on.
F-FILTER	Frequency Filter Indicator Light	A lit light indicates that the filter is on.
HARMO	Harmonic Display On Indicator Light	The light is on, indicating that the harmonic display is on.
SHIFT	Second Function Indicator Light	The light is on, indicating that the second function is active.