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The HT64 is a CAT IV, 6000-count true-RMS digital multimeter with an integrated data logger, built by HT Instruments (HT Italia SRL). It combines a broad bench-and-field measurement set with onboard recording, presenting results on a 4½-digit color TFT LCD that includes automatic polarity indication, a bargraph, backlight, and an “OL” over-range indication.
As a true-RMS multimeter, the HT64 measures the effective value of both sinusoidal and non-sinusoidal signals, covering DC, AC, and combined AC+DC voltage and current along with resistance, continuity, capacitance, frequency, duty cycle, diode test, and temperature. Separate frequency ranges are provided for electrical circuits (40 Hz to 10 kHz) and electronic circuits (up to 1 MHz), and a low-impedance (LoZ) voltage mode of approximately 3 kΩ is available for voltage measurement.
ValueTronics stocks and holds its own inventory in a 20,000 sq ft secure warehouse at 1675 Cambridge Drive in Elgin, Illinois.
| Specification | Value |
|---|---|
| DC Voltage (Input impedance >10MΩ, Overload protection 1000VDC/ACrms) | |
| 600.0 mV (res 0.1 mV) | (0.1%rdg + 5dgt) |
| 6.000 V (res 0.001 V) | (0.1%rdg + 5dgt) |
| 60.00 V (res 0.01 V) | (0.1%rdg + 5dgt) |
| 600.0 V (res 0.1 V) | (0.2%rdg + 5dgt) |
| 1000 V (res 1 V) | (0.2%rdg + 5dgt) |
| AC TRMS Voltage (5% to 100% of range, Input impedance >10MΩ, Overload protection 1000VDC/ACrms) | |
| 600.0 mV (res 0.1 mV) | (0.9%rdg + 5dgt) @ 50Hz–60Hz; (3.0%rdg + 5dgt) @ 61Hz–1kHz |
| 6.000 V (res 0.001 V) | (0.9%rdg + 5dgt) @ 50Hz–60Hz; (3.0%rdg + 5dgt) @ 61Hz–1kHz |
| 60.00 V (res 0.01 V) | (0.9%rdg + 5dgt) @ 50Hz–60Hz; (3.0%rdg + 5dgt) @ 61Hz–1kHz |
| 600.0 V (res 0.1 V) | (0.9%rdg + 5dgt) @ 50Hz–60Hz; (3.0%rdg + 5dgt) @ 61Hz–1kHz |
| 1000 V (res 1 V) | (0.9%rdg + 5dgt) @ 50Hz–60Hz; (3.0%rdg + 5dgt) @ 61Hz–1kHz |
| PEAK function response time | >1 ms |
| PEAK function accuracy | ±10%rdg |
| AC+DC TRMS Voltage (50Hz–1kHz, Input impedance >10MΩ, Overload protection 1000VDC/ACrms) | |
| 6.000 V (res 0.001 V) | (3.0%rdg + 20dgt) |
| 60.00 V (res 0.01 V) | (3.0%rdg + 20dgt) |
| 600.0 V (res 0.1 V) | (3.0%rdg + 20dgt) |
| 1000 V (res 1 V) | (3.0%rdg + 20dgt) |
| DC/AC TRMS with Low Impedance (LoZ) (50Hz–1kHz, Input impedance ca 3kΩ, Overload protection 1000VDC/ACrms) | |
| 6.000 V (res 0.001 V) | (3.0%rdg + 20dgt) |
| 60.00 V (res 0.01 V) | (3.0%rdg + 20dgt) |
| 600.0 V (res 0.1 V) | (3.0%rdg + 20dgt) |
| 1000 V (res 1 V) | (3.0%rdg + 20dgt) |
| Not sinusoidal waveforms | (10.0%rdg + 10dgt) |
| DC Current (Overload protection: Fast Fuse 0.8A/1kVAC/DC inputs mA, µA) | |
| 600.0 µA (res 0.1 µA) | (0.9%rdg + 5dgt) |
| 6000 µA (res 1 µA) | (0.9%rdg + 5dgt) |
| 60.00 mA (res 0.01 mA) | (0.9%rdg + 5dgt) |
| 600.0 mA (res 0.1 mA) | (0.9%rdg + 8dgt) |
| 10.00 A (res 0.01 A) | (1.5%rdg + 8dgt); Fast Fuse 10A/1kVAC/DC (input 10A) |
| AC TRMS Current (50Hz–1kHz, 5% to 100% of range) | |
| 600.0 µA (res 0.1 µA) | (1.2%rdg + 5dgt); Fast Fuse 0.8A/1kVAC/DC (inputs mA, µA) |
| 6000 µA (res 1 µA) | (1.2%rdg + 5dgt) |
| 60.00 mA (res 0.01 mA) | (1.2%rdg + 5dgt) |
| 600.0 mA (res 0.1 mA) | (1.2%rdg + 5dgt) |
| 10.00 A (res 0.01 A) | (1.5%rdg + 5dgt); Fast Fuse 10A/1kVAC/DC (input 10A) |
| AC+DC TRMS Current (50Hz–1kHz) | (3.0%rdg + 20dgt) |
| PEAK function response time / accuracy | >1 ms / ±10%rdg |
| DC Current with Transducer Clamps (Overload protection 1000VDC/ACrms; accuracy referred to instrument only) | |
| 1000 mA (1000mV/1000mA, res 1 mA) | (1.5%rdg + 6dgt) |
| 10 A (100mV/1A, res 0.01 A) | (1.5%rdg + 6dgt) |
| 30 A / 40 A** (10mV/1A) | (1.5%rdg + 26dgt)*** (instrument + clamp) |
| 100 A (res 0.1 A) | (1.5%rdg + 6dgt) |
| 300 A / 400 A** (1mV/1A, res 1 A) | (1.5%rdg + 26dgt)*** (instrument + clamp) |
| 1000 A | (1.5%rdg + 6dgt) |
| AC TRMS Current with Transducer Clamps (5% to 100% of range; Overload protection 1000VDC/ACrms) | |
| 1000 mA (1000mV/1000mA, res 1 mA) | (2.5%rdg + 10dgt) |
| 10 A (100mV/1A, res 0.01 A) | (2.5%rdg + 10dgt) |
| 30 A / 40 A** (10mV/1A) | (3.5%rdg + 30dgt)*** (instrument + clamp) |
| 100 A (res 0.1 A) | (2.5%rdg + 10dgt) |
| 300 A / 400 A** (1mV/1A, res 1 A) | (3.5%rdg + 30dgt)*** (instrument + clamp) |
| 1000 A | (2.5%rdg + 10dgt) |
| 3000 A | (2.5%rdg + 10dgt) |
| Not sinusoidal waveforms | (10.0%rdg + 10dgt) |
| PEAK function accuracy | ±(10%rdg + 30dgt) |
| AC+DC TRMS Current (50Hz–1kHz) | (3.0%rdg + 20dgt) |
| 4-20mA% Readings | |
| -25% Ă· 125% (res 0.1%) | 50dgt (0mA=-25%, 4mA=0%, 20mA=100%, 24mA=125%) |
| Diode Test | |
| Max test current | <1.5 mA |
| Open voltage | 3.2 V |
| Resistance and Continuity Test (Overload protection 1000VDC/ACrms) | |
| 600.0 Ω (res 0.1 Ω) | (0.8%rdg + 10dgt); Buzzer <50Ω |
| 6.000 kΩ (res 0.001 kΩ) | (0.8%rdg + 5dgt) |
| 60.00 kΩ (res 0.01 kΩ) | (0.8%rdg + 5dgt) |
| 600.0 kΩ (res 0.1 kΩ) | (0.8%rdg + 5dgt) |
| 6.000 MΩ (res 0.001 MΩ) | (0.8%rdg + 5dgt) |
| 60.00 MΩ (res 0.01 MΩ) | (2.5%rdg + 10dgt) |
| Frequency (Electrical circuits) (Sensitivity 2Vrms, Overload protection 1000VDC/ACrms) | |
| 40 Hz – 10 kHz (res 0.01Hz–0.001kHz) | (0.5%rdg) |
| Frequency (Electronic circuits) (Overload protection 1000VDC/ACrms) | |
| 60.00 Hz (res 0.01 Hz) | (0.09%rdg + 5dgt) |
| 600.0 Hz (res 0.1 Hz) | (0.09%rdg + 5dgt) |
| 6.000 kHz (res 0.001 kHz) | (0.09%rdg + 5dgt) |
| 60.00 kHz (res 0.01 kHz) | (0.09%rdg + 5dgt) |
| 600.0 kHz (res 0.1 kHz) | (0.09%rdg + 5dgt) |
| 1.000 MHz (res 0.001 MHz) | (0.09%rdg + 5dgt) |
| Sensitivity | 2Vrms min (20% |
| Duty Cycle (Overload protection 1000VDC/ACrms) | |
| 0.1 – 99.9% (res 0.01%) | (1.2%rdg + 2dgt); Pulse frequency 40Hz–10kHz, Pulse width ±5V (100µs–100ms) |
| Capacitance (Overload protection 1000VDC/ACrms) | |
| 60.00 nF (res 0.01 nF) | (1.5%rdg + 20dgt) |
| 600.0 nF (res 0.1 nF) | (1.2%rdg + 8dgt) |
| 6.000 µF (res 0.001 µF) | (1.5%rdg + 8dgt) |
| 60.00 µF (res 0.01 µF) | (1.2%rdg + 8dgt) |
| 600.0 µF (res 0.1 µF) | (1.5%rdg + 8dgt) |
| 6.000 mF (res 0.001 mF) | (2.5%rdg + 20dgt) |
| Temperature with Type K Probe (accuracy without probe, Overload protection 1000VDC/ACrms) | |
| -40.0 °C ÷ 600.0 °C (res 0.1 °C) | (1.5%rdg + 3°C) |
| 600 °C ÷ 1350 °C (res 1 °C) | (1.5%rdg + 3°C) |
| -40.0 °F ÷ 600.0 °F (res 0.1 °F) | (1.5%rdg + 5.4°F) |
| 600 °F ÷ 2462 °F (res 1 °F) | (1.5%rdg + 5.4°F) |
| Display | |
| Display | TFT LCD, colours, 4½ dgt, 6000 counts, decimal point and bargraph |
| Polarity | Automatic polarity indication |
| Backlight | Yes |
| Over range | “OL” indication |
| Response time | 3/s |
| Conversion | TRMS |
| Features | |
| Functions | Data HOLD; MAX/MIN/AVG; PEAK (Voltage and Current); AC+DC feature; Data Logger and Graph; Internal memory; Icons internal menu; REL; DC 4-20mA% current readings |
Important: Measurement category: CAT IV 600 V – CAT III 1000 V. Overload protection: 1000 V DC/AC rms.
Important: Measurement category: CAT IV 600V – CAT III 1000V; double insulation, pollution degree 2.
Important: Extended current ranges of 40 A and 400 A are specified only when used with the HT4006 transducer clamp, which is not part of the base instrument and must be obtained separately.
Important: Temperature accuracy is referred to the instrument without the Type K probe; the Type K probe is required to take temperature measurements.
Recommended pairing: use the HT4006 transducer clamp to extend AC and DC current measurement up to 3000 A per the current-with-transducer-clamp ranges.
This is a brand-new, factory-sealed unit, supplied exactly as it arrives from the manufacturer and backed by the full manufacturer warranty. For the exact configuration, available options, included accessories, or current lead time for your application, our Test Architects can confirm the details before you order.
ValueTronics supplies both new and used test and measurement equipment. New units ship factory-sealed, exactly as received from the manufacturer; every used unit is inspected and functionally verified in-house at our 20,000 sq ft secure facility in Elgin, Illinois before it ships. Our Test Architects can help you select the condition, calibration, and configuration that fit your application.
Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.
Model No
HT
Condition
Factory New
Manufacturer
HT Instruments
Multi_met_acv
1000 V
Multi_met_dcv
1000 V
Multi_met_dig
4½
Multi_met_type
TRMS
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