The HK689E is the flagship model of the HK689 clamp meter family — a professional 1000A True RMS clamp multimeter that adds AC+DC composite measurement on top of the full industrial feature set. Built on a 6000-count dual-display platform with a True RMS engine, it delivers accurate readings on non-sinusoidal waveforms produced by variable frequency drives (VFDs), switching power supplies, inverters, and LED loads — where average-responding meters can be off by 30% or more.

What sets the HK689E apart is its ability to measure the true combined AC+DC value of voltage (1000V) and current (1000A) — the complete RMS of a signal carrying a DC offset. This is essential for circuits where a DC component rides on an AC waveform: solar PV strings feeding grid-tie inverters, UPS / battery-backed systems with DC bus rails, EV charging stations, and traction / DC microgrid installations. The HK689E also measures DC current up to 1000A via the clamp jaw — something the AC-only HK689C cannot do.

Beyond AC+DC capability, the HK689E integrates a comprehensive suite of advanced diagnostic functions: LoZ (low-impedance) voltage measurement to eliminate ghost voltages, VFD measurement mode for accurate readings through inverter-driven motors, three-phase sequence detection, RCD 30mA residual-current device testing, inrush current capture, DC low-current measurement down to 2000µA, temperature up to 400°C / 750°F (Type-K), MAX/MIN/AVG recording, NCV detection, live-wire recognition, continuity and diode testing, and a fused 200mA input with full-range overload protection. A bright EBTN dual display, backlight, and flashlight enable clear readings in dimly lit electrical cabinets.

Highlight Features

• AC+DC Voltage & Current Measurement (EXCLUSIVE) — Measures the true combined AC+DC RMS value of voltage (1000V) and current (1000A) — the complete signal including any DC offset. Essential for solar PV, UPS/battery, EV charging, and traction circuits where DC rides on AC.

• DC Current Measurement — 1000A (EXCLUSIVE) — Measures DC current up to 1000A directly through the clamp jaw — for battery banks, solar strings, DC busbars, EV charging, and traction systems — without breaking the circuit or using a shunt.

• True RMS Measurement — 6000-count True RMS engine delivers accurate voltage and current readings on distorted, non-sinusoidal waveforms from VFDs, SMPS, inverters, and LED loads — where average-responding meters can be off by 30%+.

• LoZ Low-Impedance Voltage (1000V) — Eliminates ghost / phantom voltages caused by capacitive coupling in adjacent conductors. Confirms whether a voltage is real and capable of driving current — critical for safe lockout/tagout decisions.

• VFD Measurement Mode — Special filtering provides stable, accurate AC voltage and AC current readings on the output of variable frequency drives — the noisy, pulsed waveforms that defeat ordinary clamp meters.

• Three-Phase Sequence Detection — Verifies phase rotation (L1-L2-L3 / clockwise or counter-clockwise) on three-phase installations — prevents motor reversal, pump damage, and costly commissioning errors before power-up.

• RCD 30mA Detection — Tests residual-current device (RCD / GFCI / RCBO) trip performance at the 30mA personnel-protection threshold — validates that life-safety breakers will actually trip in the event of a fault.

• Inrush Current Capture — Captures the brief starting-current surge of motors, transformers, power supplies, and lighting ballasts. Essential for sizing breakers, fuses, and contactors against real-world startup loads.

• DC Low Current — 2000µA Range — Dedicated microamp range resolves down to 2000µA (2mA) DC — for sensor loops, 4-20mA instrumentation, leakage current checks, and electronic control circuit diagnostics.

• Temperature Measurement — Type-K thermocouple input measures up to 400°C (750°F) — for motor bearings, transformers, busbars, solar inverters, and thermal overload troubleshooting without a separate instrument.

• EBTN Dual Display — 36×50.5mm high-contrast EBTN (Enhanced twisted nematic) screen shows a primary reading plus a secondary reading simultaneously — e.g. AC+DC voltage + DC component, current + MAX, with backlight and unit icons.

• Safety — CAT IV 600V — Measurement category IV 600V rating protects the user against transient overvoltages at the service entrance, utility connections, and outdoor conductors — the highest-risk measurement points in a facility.

• Fused 200mA Input & Full-Range Overload Protection — Dedicated fused 200mA terminal with full-range overload protection on every range — survives mis-connection to live circuits, protecting the meter and the technician.

• NCV Detection & Live-Wire Recognition — Non-contact voltage detection from outside the insulation, plus live-wire recognition — quickly identifies energized conductors before opening panels or pulling conductors.

• MAX / MIN / AVG Recording — Records and displays maximum, minimum, and average values over a measurement session — for intermittent faults, load profiling, and verifying voltage/current stability over time.

• Wake-Up & Auto Power Off — Saves battery during long jobs; wake-up function reactivates the meter without cycling the dial. Low-battery indication and 1.5V (AAA)×3 power keep the instrument running on widely available cells.

Specifications

Note: ● = Included / Supported  |  — = Not supported. ⭐ = Exclusive AC+DC capability of the HK689E (not available on the HK689C). Specifications subject to change without notice for product improvement.

Application Scenarios

The HK689E is purpose-built for applications where AC+DC composite measurement or DC current measurement is essential — plus every industrial scenario the HK689C covers.

• Solar PV & Renewable Energy — AC+DC voltage & current for solar string inspection, inverter DC-side checks, and combiner-box commissioning — where DC offset on AC waveforms is the rule, not the exception.

• UPS & Battery Systems — Validate battery-backed UPS outputs and DC bus rails. AC+DC composite measurement captures the true total RMS of signals with a DC offset — impossible with an AC-only clamp meter.

• EV Charging Stations — Electric-vehicle charging stations carry combined AC+DC content. The HK689E measures the complete signal in a single reading — for installation, commissioning, and maintenance.

• DC Current up to 1000A — Direct DC current measurement through the clamp jaw — battery banks, DC busbars, telecom -48V systems, traction circuits — no shunt, no circuit break required.

• Industrial Maintenance & Troubleshooting — Diagnose motor controllers, contactors, and control panels. Inrush current captures motor startup surges; LoZ rules out ghost voltages; MAX/MIN/AVG tracks intermittent loads.

• VFD / Inverter-Driven Motor Systems — Specialized VFD mode gives accurate voltage & current readings on the noisy, pulsed output of variable frequency drives — HVAC fans, conveyor motors, pump drives.

• Three-Phase Power Installations — Verify L1-L2-L3 phase rotation before energizing three-phase motors, pumps, and compressors. Prevents motor reversal and mechanical damage during commissioning.

• Building & Facility Electrical — Distribution panels, sub-panels, and branch circuits. RCD 30mA validates personnel-protection breakers; NCV & live-wire recognition speed up circuit identification.

• Instrumentation & Control Loops — 2000µA DC low-current range for 4-20mA sensor loops, PLC analog I/O, and leakage-current checks on sensitive electronic circuits — without a separate process clamp meter.

• HVAC & Refrigeration — Compressor startup current, fan-motor VFD output, temperature checks on refrigerant lines and condensers — one instrument covers electrical and thermal sides of HVAC service.

• Energy Audit & Load Profiling — Load profiling with MAX/MIN/AVG, temperature scans on busbars & transformers, and inrush verification for breaker and fuse sizing during energy audits and capacity planning.

• Field Service & Commissioning — Compact 270g body, Φ42mm jaw fits most busbars and parallel conductors, flashlight + backlight for cable trenches and switchgear rooms — purpose-built for the field technician’s bag.