The HK888B is a professional-grade, 6000-count True RMS clamp meter engineered specifically for high-voltage photovoltaic (PV) systems and industrial power applications. Capable of measuring up to 2000V DC and 2000A DC/AC, it is one of the few handheld meters equipped to handle the full range of solar installation demands—from individual panel diagnostics to string and inverter testing. With advanced features like AC+DC True RMS, LoZ (Low Impedance) mode, VFD, inrush current, and a CAT III 1500V / CAT IV 1000V safety rating, the HK888B ensures accurate, reliable, and safe measurements in the harshest electrical environments.

Features

• PV-Optimized High Voltage Range: Measures DC voltage up to 2000V (CAT III 1500V / CAT IV 1000V) – ideal for series-connected solar strings.

• Bidirectional DC Current: Captures 2000A DC for charging/discharging in battery storage and PV arrays.

• True RMS AC+DC: Accurately measures distorted waveforms on inverter outputs (both AC and DC components simultaneously).

• Flex Clamp Input: Supports an external flexible current probe for measuring up to 3000A in tight spaces.

• Low Impedance (LoZ) Mode: Eliminates ghost voltages to prevent false readings on long PV cables.

• Specialty Modes:

  • VFD Mode: For variable frequency drive motor signals.

  • Inrush Current: Captures motor/generator startup surges.

  • Peak Hold: Captures transient voltage/current spikes.

• Rugged & Safe: Double-colored flame-retardant ABS housing, built-in flashlight, NCV, live wire recognition.

• Large Jaw Opening: Fits large gauge battery cables and busbars.

Specification 

General Specifications

Application 

1. Solar PV Installation & Maintenance:

   • Measuring string DC voltage (up to 2000V) and current (up to 2000A).

   • Verifying inverter AC/DC output and efficiency.

   • Tracing ground faults and open circuits in combiner boxes.

2. Battery Energy Storage Systems (BESS):

   • Monitoring charge/discharge DC current of battery racks.

   • Testing busbar voltage and cell balancing.

3. Industrial Electrical:

   • Measuring inrush current on large motors, pumps, and HVAC compressors.

   • Diagnosing VFD-driven systems (VFD mode).

   • High-capacity capacitance testing for power factor correction.

4. EV & High-Power DC Systems:

   • Testing DC-DC converters and traction battery packs in electric vehicles.

5. Utility & Renewable Energy Labs:

   • Accurate AC+DC waveform analysis on hybrid inverter outputs.

FAQ (Frequently Asked Questions)

Q1: Can the HK888B measure DC current?
✅ Yes. Unlike many standard clamp meters, the HK888B measures DC current up to 2000A, essential for PV strings, battery banks, and EV systems.

Q2: What is the maximum voltage I can safely measure?
✅ 2000V DC / 1500V AC with a safety rating of CAT III 1500V / CAT IV 1000V – compliant with high-voltage solar standards.

Q3: Why do I need AC+DC True RMS?
✅ Solar inverters output PWM or modified sine waves containing both AC and DC components. AC+DC mode gives you the true total RMS value (heating equivalent) rather than just the AC component.

Q4: Can I use the HK888B without breaking the circuit?
✅ Yes. The clamp jaw (Φ60.5mm) allows non-contact current measurement. For voltage, you still need to probe test points.

Q5: Does it work with a flexible current probe?
✅ Yes. It has a dedicated Flex Clamp input supporting up to 3000A (accuracy ±2.5%+5d), useful for tight busbars or large conductors.

Q6: What is LoZ mode used for?
✅ Low Impedance (LoZ) mode places a low-impedance load on the circuit, draining induced ghost voltages that can cause false readings on long, unloaded PV cables.

Q7: How do I capture motor starting current?
✅ Use the Inrush Current Test mode. Clamp the meter around the conductor, then start the motor – the meter automatically captures the initial surge.

Q8: What accessories are included?
✅ Typically includes: test leads, thermocouple (for temperature), batteries (3×AA), user manual, and a carrying case. (Flex clamp probe optional.)

Q9: Is the meter durable for outdoor solar farms?
✅ Yes. It features a double-colored, flame-retardant ABS housing, built-in flashlight, and robust construction. (Check IP rating – likely IP54 or similar, though not specified.)

Q10: How is HK888B different from HK888A / HK888D?
✅

• HK888A: AC current only (no DC current), lower CAT rating (likely CAT III 1000V).

• HK888D: Has DC current but may lack AC+DC mode and Flex input.

• HK888B: Full PV package – DC current + AC+DC True RMS + Flex input + 2000V DC + CAT III 1500V.

HK888 Series Clamp Meters

Four Models for Different Measurement Needs

The HK888 series combines True RMS measurement, a 6000-count display, and voltage ranges up to 2000V DC and 1500V AC. Each model offers a distinct combination of measurement functions and design features, from phase sequence testing to flexible-coil current measurement and a premium waterproof design.

HK888A — 2000A AC Clamp Meter with Phase Sequence Testing

The HK888A combines 2000A AC current measurement with phase sequence testing, providing a practical feature set for electrical installation and maintenance work.

Key features

• Phase sequence testing.
• AC current measurement up to 2000A.
• Frequency measurement up to 10MHz.
• Duty cycle measurement from 0.1% to 99.9%.
• Inrush current measurement and peak hold.
• 60.5mm jaw opening.

HK888D — 2000A AC/DC Clamp Meter for General-Purpose Testing

The HK888D brings together current, voltage, temperature, frequency, and duty cycle measurement in a general-purpose instrument. Its broad measurement range makes it a practical choice for everyday electrical testing and maintenance.

Key features

• AC and DC current measurement up to 2000A.
• Temperature measurement up to 1300°C / 2372°F.
• Frequency measurement up to 10MHz.
• Duty cycle measurement from 0.1% to 99.9%.
• NCV detection and live wire recognition.
• Inrush current measurement and peak hold.
• 60.5mm jaw opening.

HK888E — Premium Dual-Molded Clamp Meter with Waterproof Design

Designed for the premium market, the HK888E is the only model in this series with a dual-color injection-molded housing. It combines a waterproof design and a larger 66mm jaw opening with 3000A flexible-coil support and VFD testing.

Key features

• Exclusive dual-color injection-molded housing within the HK888 series.
• Waterproof design.
• Large 66mm jaw opening.
• AC and DC current measurement up to 2000A.
• Support for a 3000A flexible current coil.
• AC+DC current measurement up to 2000A.
• VFD testing for AC voltage and AC current.
• Temperature measurement up to 1300°C / 2372°F.
• NCV detection and live wire recognition.

Features Shared Across the Series

Choose the Model That Fits Your Application

3000A measurement requires a compatible external flexible current coil. Waterproof use of the HK888E must follow the conditions specified in its product documentation.