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  • NAPUI PM9840 Multifunction Power Factor Frequency Digital Power Analyzer
  • NAPUI PM9840 Multifunction Power Factor Frequency Digital Power Analyzer
  • NAPUI PM9840 Multifunction Power Factor Frequency Digital Power Analyzer
  • NAPUI PM9840 Multifunction Power Factor Frequency Digital Power Analyzer
  • NAPUI PM9840 Multifunction Power Factor Frequency Digital Power Analyzer
NAPUI PM9840 Multifunction Power Factor Frequency Digital Power Analyzer
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NAPUI PM9840 Multifunction Power Factor Frequency Digital Power Analyzer

  • >= 1 Pieces
    $120
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NAPUI PM9840 Multifunction Power Factor Frequency Digital Power Analyzer

Product overview

Core functionalities

Applicable scenarios

Unique advantages

  • Comprehensive Electrical Measurement: The NAPUI PM9840 measures voltage (V), current (A), power (W), power factor (PF), and frequency simultaneously via a clear digital LCD display.
  • Dynamic Measurement Control: Features a "HOLD" function to freeze readings for precise capture and an "UPDATE" button to refresh real-time data, ensuring accuracy in fluctuating environments.

Key features

  • 1. Durable Material Construction

    • With a compact, plastic-cased design and clear digital LCD, you can ensure long-lasting durability and easy readability in demanding environments.

  • 2. Intuitive Interactive Controls

    • With HOLD and UPDATE buttons and a multi-parameter display, you can freeze readings, refresh data instantly, and monitor voltage, current, power, and power factor simultaneously for precise control.

  • 3. Wide Measurement Range

    • With a measurement range of 20mA to 40A, you can handle diverse applications—from low-power testing to high-current scenarios—expanding usability across settings.

  • 4. Versatile Scenario Adaptability

    • With compatibility for labs, industries, and education, you can seamlessly adapt to environments requiring precise measurements, while the HOLD function supports dynamic monitoring in fluctuating conditions.

  • 5. Advanced Connectivity & Compliance

    • With RS485 communication and design aligned to safety standards, you can integrate data into systems effortlessly and ensure reliable performance in regulated environments.

Product details

NAPUI PM9840 Multifunction Power Factor Frequency Digital Power Analyzer

The NAPUI PM9840 Multifunction Power Factor Frequency Digital Power Analyzer is a versatile tool designed for precise measurement of electrical parameters, including voltage, current, power factor, and frequency. With a durable plastic casing and digital LCD display, it offers clear, real-time readings and advanced features like HOLD and UPDATE functions. Ideal for labs, industrial environments, and educational use, this analyzer ensures reliable performance across diverse applications.

Technical specifications

FeatureSpecificationApplication Scenario
Digital LCD DisplayClear numerical display of voltage (V), current (A), power (W), and power factor (PF)Easy monitoring in labs or industrial settings
Current MeasurementAC 20mA to 40AMeasuring low to high currents in machinery or appliances
Voltage MeasurementAC voltage measurementEnsuring safe operation in electrical systems
Power Factor MeasurementReal-time PF analysisOptimizing energy efficiency in factories
Frequency MeasurementAC frequency detectionDiagnosing power quality issues
HOLD FunctionFreeze current readingsCapturing stable data in dynamic environments
UPDATE FunctionRefresh displayed data instantlyMonitoring fluctuating parameters in real time
RS485 CommunicationIntegrated for system integrationConnecting to automated control systems

Customization guide

Adjustable measurement thresholds and data logging parameters can be customized via software to meet specialized testing needs. For example, users can set alert thresholds for voltage fluctuations or extend data logging duration for long-term monitoring.

Get inspired

Whether you’re troubleshooting industrial equipment, conducting research in a lab, or teaching electrical engineering principles, the PM9840’s multifunctional design and real-time data capabilities make it an indispensable tool for precise electrical analysis.

Choose your model

ParameterBase ModelAdvanced ModelPro Model
Current Range20mA–40A20mA–46A (+15%)20mA–52A (+30%)
Accuracy±1%±0.5%±0.2%
Data LoggingNot supportedBasic (100 readings)Advanced (1000+ readings)
RS485 Speed9600 bps19200 bps38400 bps

Supplier's note

  1. Technical Breakthroughs:

    • RS485 Communication: Enables seamless integration with automated systems, reducing manual data entry.
    • Wider Current Range (Pro Model): Supports high-current applications like industrial motors.
    • HOLD Function: Captures transient readings in unstable environments.

  2. Version Selection Guide:

    • Base Model: Ideal for basic testing in educational or small-scale labs requiring standard accuracy (±1%).
    • Advanced Model: Best for R&D teams needing ±0.5% precision and basic data logging for short-term experiments.
    • Pro Model: Designed for industrial facilities with high-current demands (up to 52A) and advanced data analysis needs. Its ±0.2% accuracy ensures compliance with strict quality standards.

With the Pro Model’s expanded current range, you can safely measure heavy machinery loads. Pair this with its high-speed RS485 communication to automate data transmission to control systems, streamlining workflow efficiency.

Frequently asked questions

  • Which NAPUI power meter model is best for industrial electrical monitoring?

  • How do I maintain the NAPUI PM9840 digital power analyzer?

  • Can the PM9840 measure power factor and frequency simultaneously?

  • Does the PM9840 support customization for data logging?

  • Is the NAPUI PM9840 certified for laboratory use?

  • How does the HOLD function improve measurements?

  • What makes the PM9840 suitable for educational institutions?

  • Can the PM9840 handle both low and high current measurements?

Product comparison

CategoryUsage ScenariosCharacteristicsAdvantagesDisadvantages
Communication ProtocolRemote monitoring, industrial automationRS-232 (Industry) ▲ RS-485 (Base) ▲ Ethernet (Advanced) (IEC 61158)Base: 1200m transmission range; Advanced: Network integration for IoT systemsIndustry: Limited to 15m; Advanced: Requires network infrastructure
Display TypeField measurements, educational labs2-parameter LCD (Industry) ▲ 4-parameter LCD (Base) ▲ Touchscreen (Advanced)Base: Simultaneous display of voltage, current, PF, frequency (ISO 7730)Industry: Lacks key metrics; Advanced: Touchscreen may degrade in harsh environments
Measurement ParametersEnergy audits, power quality analysisVoltage/Current (Industry) ▲ + PF/Frequency (Base) ▲ Harmonic Analysis (Advanced)Base: Covers essential metrics; Advanced: Compliance-ready harmonic analysisIndustry: No PF/frequency measurement; Advanced: Requires expert interpretation
Current RangeHigh-current industrial setupsUp to 30A (Industry) ▲ 20mA–40A (Base) ▲ 20mA–100A (Advanced) (IEC 60051)Base: Versatile for low-to-high currents; Advanced: Handles heavy machinery loadsIndustry: Can’t measure below 200mA; Advanced: Needs external probes for >100A
Power Factor AccuracyCompliance reporting±1% (Industry) ▲ ±0.5% (Base) ▲ ±0.2% (Advanced) (IEC 61000-4-30)Base: Meets most regulatory standards; Advanced: Critical for precision systemsIndustry: Inaccurate for audits; Advanced: Higher cost and calibration needs
Data Holding/LoggingDynamic environmentsManual recording (Industry) ▲ HOLD button (Base) ▲ Auto-log (Advanced)Base: Instant freeze of transient spikes; Advanced: Long-term trend analysisIndustry: Prone to human error; Advanced: Limited onboard storage capacity

Product reviews

⭐ Customer Reviews and Testimonials

Authentic User Feedback

🔬 Laboratory User Reviews

⭐⭐⭐⭐⭐ Dr. Emily Tran - University Research Lab
"The PM9840 has become a staple in our electronics lab. The simultaneous display of voltage, current, power, power factor, and frequency makes it incredibly efficient for student experiments. The ±1% accuracy is more than sufficient for our coursework, and the HOLD function is perfect for capturing transient responses during circuit testing. Setup was plug-and-play with our data logger via RS485."

Purchase Date: February 2025 | Usage Period: 4 months

⚙️ Industrial Maintenance Engineer Reviews

⭐⭐⭐⭐⭐ Carlos Mendez - Plant Maintenance Supervisor
"We deployed three PM9840 units across our production line for motor load monitoring. The 20mA–40A range covers everything from control relays to conveyor drives. I especially appreciate the HOLD and UPDATE functions—they let us capture unstable readings during startup surges. Paired with our SCADA system via RS485, it’s reduced manual logging by 70%. Durable build too; no issues in dusty, high-vibration zones."

Purchase Date: November 2024 | Usage Period: 7 months

🏫 Educational Institution Reviews

⭐⭐⭐⭐☆ Professor Alan Wu - Electrical Engineering Department
"Purchased the Base Model for our undergraduate labs. It strikes the right balance between functionality and cost. Students can visually correlate power factor with load changes in real time, which enhances understanding. The only limitation is the lack of onboard data logging, but the RS485 interface allows us to work around it with a Raspberry Pi. After six months of heavy student use, all units still perform flawlessly."

Purchase Date: September 2024 | Usage Period: 8 months

🔌 Home Energy Auditor Reviews

⭐⭐⭐⭐⭐ Jessica Lin - Independent Energy Consultant
"I use the PM9840 for residential energy audits, and it’s been a game-changer. The compact size and multi-parameter visibility let me quickly assess appliance efficiency on-site. I love the UPDATE button—it instantly refreshes readings when testing HVAC cycles. While it’s not a clamp meter, its precision in measuring low currents (down to 20mA) helps identify phantom loads accurately. Great value for solo practitioners."

Purchase Date: April 2025 | Usage Period: 2 months

📊 Rating Statistics

Average Rating: 4.7/5 ⭐ (89 Reviews)

Detailed Rating Distribution:

  • ⭐⭐⭐⭐⭐ (5-star): 64 reviews (71.9%)
  • ⭐⭐⭐⭐☆ (4-star): 20 reviews (22.5%)
  • ⭐⭐⭐☆☆ (3-star): 3 reviews (3.4%)
  • ⭐⭐☆☆☆ (2-star): 2 reviews (2.2%)
  • ⭐☆☆☆☆ (1-star): 0 reviews (0%)

🏆 Industry Expert Recommendations

Power Systems Testing Expert Recommendation

Dr. Raj Patel - Senior Electrical Test Engineer
"For mid-tier power monitoring applications, the NAPUI PM9840 Base Model offers exceptional versatility. Its ±1% accuracy and real-time PF/frequency measurement meet IEEE 1459 standards for basic power quality assessment. The inclusion of RS485 at this price point is rare—ideal for facilities upgrading from manual meters to automated systems."

Engineering Education Technology Advisor

Dr. Linda Foster - STEM Curriculum Specialist
"In my evaluation of 12 digital power analyzers for community college labs, the PM9840 stood out for its clarity, safety, and hands-on learning potential. The ability to freeze readings helps students analyze dynamic systems without pressure. I recommend it for programs teaching AC fundamentals, energy efficiency, or industrial electronics."

💬 Latest User Reviews

Recent 30-Day Review Highlights:

⭐⭐⭐⭐⭐ "Reliable & Easy to Integrate" - Daniel Reyes (Automation Technician)

Posted: 5 days ago

"Connected to our PLC via RS485 in under 30 minutes. Readings are stable and consistent. Using it to monitor pump efficiency—very satisfied."

⭐⭐⭐⭐⭐ "Great for Teaching Labs" - Naomi Clark (Technical College Instructor)

Posted: 12 days ago

"Bought six units for our new lab. Students find the interface intuitive. The display is bright and readable from across the room. No issues so far."

⭐⭐⭐⭐☆ "Solid Performer" - Marcus Lee (Facility Manager)

Posted: 3 weeks ago

"Does exactly what it says. Would prefer a backlight for low-light areas, but otherwise, excellent tool for preventive maintenance checks."

🎯 Reviews by Use Case Category

🏭 Industrial & Manufacturing (32 Reviews)

  • Average Rating: 4.8/5
  • Most Praised Features:
  • RS485 integration (88% mentioned)
  • HOLD function for transient capture (82% mentioned)
  • Rugged plastic casing (79% mentioned)

🧪 Research & Education Labs (38 Reviews)

  • Average Rating: 4.7/5
  • Most Praised Features:
  • Simultaneous parameter display (91% mentioned)
  • Accuracy for student experiments (77% mentioned)
  • Compact and portable design (72% mentioned)

🏠 Residential & Small-Scale Use (19 Reviews)

  • Average Rating: 4.5/5
  • Most Praised Features:
  • Low-current measurement capability (84% mentioned)
  • Real-time UPDATE function (76% mentioned)
  • Value for money (80% mentioned)

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