The HK689C True RMS AC clamp meter combines AC current measurement up to 1000A with AC/DC voltage measurement up to 1000V. Its 6A, 60A, 600A and 1000A AC current ranges support electrical troubleshooting, equipment maintenance and load checks across a variety of applications.
For motor and drive diagnostics, the HK689C includes VFD mode, inrush current testing and peak hold. LoZ AC/DC voltage measurement helps reduce the influence of ghost voltages, while NCV detection and live wire recognition support preliminary wiring checks.
Additional functions include DC microamp measurement, resistance, capacitance, frequency and temperature testing. A backlit LCD, analog bar display and built-in flashlight make readings easier to view in dim work areas.
Key Features
- 1000A AC current measurement: Four selectable ranges—6A, 60A, 600A and 1000A—for checking electrical loads.
- True RMS measurement: Supports AC troubleshooting where waveforms may be non-sinusoidal.
- 1000V AC/DC voltage measurement: Covers low-voltage signals through higher-voltage electrical measurements.
- VFD and motor testing functions: Combines VFD mode, inrush current testing and peak hold for equipment diagnostics.
- LoZ AC/DC mode: Helps distinguish induced ghost voltages from a connected voltage source.
- DC microamp measurement: Dedicated 200μA and 2000μA ranges for low-current testing.
- Multiple diagnostic functions: Includes NCV, live wire recognition, phase sequence detection and a 30mA RCD test function.
- Convenient reading and recording: Backlight, flashlight, analog bar, data hold, relative mode and MAX/MIN/AVG functions.
Technical Specifications
Accuracy is expressed as ±(% of reading + digits).
| Measurement | Range | Accuracy |
|---|---|---|
| DC voltage | 600mV | ±(0.5% + 3 digits) |
| DC voltage | 6V / 60V / 600V | ±(0.5% + 2 digits) |
| DC voltage | 1000V | ±(0.8% + 5 digits) |
| AC voltage | 6V / 60V | ±(1.0% + 5 digits) |
| AC voltage | 600V | ±(0.8% + 5 digits) |
| AC voltage | 1000V | ±(1.0% + 5 digits) |
| AC current | 6A / 60A / 600A / 1000A | ±(2.5% + 5 digits) |
| DC microamp current | 200μA / 2000μA | ±(1.2% + 5 digits) |
| Resistance | 600Ω | ±(1.0% + 2 digits) |
| Capacitance | 600nF / 6μF / 60μF / 600μF | ±(4.0% + 5 digits) |
| Capacitance | 6mF | ±(10% + 5 digits) |
| Frequency | 5Hz–1MHz | ±(0.1% + 5 digits) |
| Temperature | −40°C to 0°C | ±(5% + 4 digits) |
| Temperature | 0°C to 400°C | ±(2.0% + 3 digits) |
| Temperature* | −4°F to 50°F | ±(5% + 4 digits) |
| Temperature* | 50°F to 750°F | ±(2.0% + 5 digits) |
Functions and General Specifications
| Feature | Specification |
|---|---|
| True RMS | Yes |
| Display count | 5999 + 1999 |
| Range selection | Auto / Manual |
| LoZ AC/DC voltage | Up to 1000V |
| VFD mode | Yes |
| Inrush current test | Yes |
| Peak hold | Yes |
| MAX / MIN / AVG | Yes |
| Data hold | Yes |
| Relative mode | Yes |
| Diode test | Yes |
| Continuity buzzer | Yes |
| Non-contact voltage detection (NCV) | Yes |
| Live wire recognition | Yes |
| Phase sequence detection | Yes |
| RCD test | 30mA test function |
| Analog bar display | Yes |
| LCD backlight | Yes |
| Built-in flashlight | Yes |
| Auto power off | Yes |
| Measurement category rating | CAT III 1000V / CAT IV 600V |
| Power supply | 3 × 1.5V AA batteries |
Applications
- Electrical installation and maintenance: Measure AC loads and AC/DC voltage when inspecting circuits and equipment.
- Motor startup troubleshooting: Use inrush current testing and peak hold to investigate startup behavior.
- Variable frequency drive maintenance: Use VFD mode when checking drive-controlled equipment.
- HVAC equipment servicing: Combine AC current, capacitance and temperature measurements for equipment checks.
- Facility maintenance: Perform continuity, diode and resistance tests during routine electrical troubleshooting.
- Three-phase installation checks: Use phase sequence detection when checking phase order.
