# HT Instruments HT401 Professional AC+DC TRMS Multimeter # HT Instruments HT401 Professional AC+DC TRMS Multimeter ## Key Features At A Glance - AC+DC TRMS measurement of voltage and current, including the DC component overlapped on an AC signal - CAT IV 600V / CAT III 1000V rated; IEC/EN61010-1 and UL61010-1, double insulation - 4-digit LCD, 6000-count maximum reading with bargraph, backlight, auto polarity and OL over-range - VOLTSENSE non-contact AC voltage detection and AUTO-V low-impedance (approx 3kΩ) voltage mode - DC voltage to 1000V, DC current to 10A, resistance to 40MΩ, frequency to 100kHz, capacitance to 10mF - Type K temperature measurement from -40.0 to 400.0 °C - PEAK / PEAK HOLD, MAX/MIN, Data HOLD, REL relative mode, manual RANGE, Auto Power OFF after 20 min The HT401 is a professional AC+DC TRMS multimeter from HT Italia. It is a handheld digital instrument built around a 4-digit LCD with a maximum reading of 6000 counts, including sign, decimal point and a bargraph, with automatic polarity indication, backlight, and an "OL" over-range indication. A true-RMS meter reports the actual root-mean-square value of a signal rather than an averaged approximation, which keeps readings accurate on non-sinusoidal waveforms. The HT401 covers DC and AC TRMS voltage, DC and AC TRMS current, AC+DC TRMS voltage and current, resistance, continuity, diode test, frequency, capacitance, and Type K temperature. For non-sinusoidal voltages it publishes crest-factor correction terms across a maximum crest factor of 3.0, and a PEAK HOLD feature is specified to within ±150 digits. ValueTronics stocks and holds its own inventory in a 20,000 square-foot secure warehouse at 1675 Cambridge Drive in Elgin, Illinois. ## Product Core & Specifications Range Resolution Accuracy Overload Protection DC Voltage (Accuracy at 23°C ± 5°C, <80%HR) 60.00 mV 0.01 mV ±(0.08%rdg+10dgt) 1000VDC/ACrms 600.0 mV 0.1 mV ±(0.08%rdg+2dgt) 1000VDC/ACrms 6.000 V 0.001 V ±(0.08%rdg+2dgt) 1000VDC/ACrms 60.00 V 0.01 V ±(0.08%rdg+2dgt) 1000VDC/ACrms 600.0 V 0.1 V ±(0.08%rdg+2dgt) 1000VDC/ACrms 1000 V 1 V ±(0.08%rdg+2dgt) 1000VDC/ACrms Input impedance 10MΩ // <100pF AC TRMS Voltage (50Hz ÷ 1kHz) 60.00 mV 0.01 mV ±(1.2%rdg+5dgt) 1000VDC/ACrms 600.0 mV 0.1 mV ±(1.2%rdg+5dgt) 1000VDC/ACrms 6.000 V 0.001 V ±(0.8%rdg+5dgt) 1000VDC/ACrms 60.00 V 0.01 V ±(0.8%rdg+5dgt) 1000VDC/ACrms 600.0 V 0.1 V ±(0.8%rdg+5dgt) 1000VDC/ACrms 1000 V 1 V ±(0.8%rdg+5dgt) 1000VDC/ACrms Input impedance 10MΩ // <100pF Crest factor 1.4 ÷ 2.0 add 1.0%rdg Crest factor 2.0 ÷ 2.5 add 2.5%rdg Crest factor 2.5 ÷ 3.0 add 4.0%rdg Max crest factor 3.0 (0 ÷ 3000 dgt); 2.0 (3000 ÷ 5000 dgt); 1.6 (5000 ÷ 6000 dgt) PEAK HOLD feature specified accuracy ±150dgt AC+DC TRMS Voltage (50Hz ÷ 1kHz) 60.00 mV 0.01 mV ±(2.0%rdg+10dgt) 1000VDC/ACrms 600.0 mV 0.1 mV ±(2.0%rdg+10dgt) 1000VDC/ACrms 6.000 V 0.001 V ±(2.0%rdg+5dgt) 1000VDC/ACrms 60.00 V 0.01 V ±(2.0%rdg+5dgt) 1000VDC/ACrms 600.0 V 0.1 V ±(2.0%rdg+5dgt) 1000VDC/ACrms 1000 V 1 V ±(2.0%rdg+5dgt) 1000VDC/ACrms Input impedance 10MΩ // <100pF PEAK HOLD feature specified accuracy ±150dgt AUTO –V Voltage (low impedance, approx 3kΩ) (50Hz ÷ 1kHz) 600.0 V DC 0.1 V ±(0.8%rdg+3dgt) 1000VDC/ACrms 1000 V DC 1 V ±(0.8%rdg+3dgt) 1000VDC/ACrms 600.0 V AC 0.1 V ±(0.8%rdg+3dgt) 1000VDC/ACrms 1000 V AC 1 V ±(0.8%rdg+3dgt) 1000VDC/ACrms DC Current 60.00 mA 0.01 mA ±(0.8%rdg+3dgt) Fuse 440mA/1kVAC/DC,10kA (input mA); Fuse 11A/1kVAC/DC,20kA (input A) 600.0 mA 0.1 mA ±(0.8%rdg+3dgt) Fuse 440mA/1kVAC/DC,10kA (input mA); Fuse 11A/1kVAC/DC,20kA (input A) 6.000 A 0.001 A ±(0.8%rdg+3dgt) Fuse 11A/1kVAC/DC,20kA (input A) 10.00 A 0.01 A ±(0.8%rdg+3dgt) Fuse 11A/1kVAC/DC,20kA (input A) AC TRMS Current (50Hz ÷ 1kHz) 60.00 mA 0.01 mA ±(1.2%rdg+3dgt) Fuse 440mA/1kVAC/DC,10kA (input mA); Fuse 11A/1kVAC/DC,20kA (input A) 600.0 mA 0.1 mA ±(1.2%rdg+3dgt) Fuse 440mA/1kVAC/DC,10kA (input mA); Fuse 11A/1kVAC/DC,20kA (input A) 6.000 A 0.001 A ±(1.2%rdg+3dgt) Fuse 11A/1kVAC/DC,20kA (input A) 10.00 A 0.01 A ±(1.2%rdg+3dgt) Fuse 11A/1kVAC/DC,20kA (input A) PEAK HOLD feature specified accuracy ±150dgt AC+DC TRMS Current (50Hz ÷ 1kHz) 60.00 mA 0.01 mA ±(2.0%rdg+5dgt) Fuse 440mA/1kVAC/DC,10kA (input mA); Fuse 11A/1kVAC/DC,20kA (input A) 600.0 mA 0.1 mA ±(2.0%rdg+5dgt) Fuse 440mA/1kVAC/DC,10kA (input mA); Fuse 11A/1kVAC/DC,20kA (input A) 6.000 A 0.001 A ±(2.0%rdg+5dgt) Fuse 11A/1kVAC/DC,20kA (input A) 10.00 A 0.01 A ±(2.0%rdg+5dgt) Fuse 11A/1kVAC/DC,20kA (input A) PEAK HOLD feature specified accuracy ±150dgt Resistance 600.0 Ω 0.1 Ω ±(0.8%rdg+5dgt) 1000VDC/ACrms 6.000 kΩ 0.001 kΩ ±(0.8%rdg+2dgt) 1000VDC/ACrms 60.00 kΩ 0.01 kΩ ±(0.8%rdg+2dgt) 1000VDC/ACrms 600.0 kΩ 0.1 kΩ ±(0.8%rdg+2dgt) 1000VDC/ACrms 6.000 MΩ 0.001 MΩ ±(0.8%rdg+2dgt) 1000VDC/ACrms 40.00 MΩ 0.01 MΩ ±(1.0%rdg+5dgt) 1000VDC/ACrms Open voltage <2.5V (600Ω ÷ 6kΩ); <0.6V (60kΩ ÷ 40MΩ) Continuity Test 600.0 Ω 0.1 Ω ±(0.8%rdg+5dgt) 1000VDC/ACrms Max open voltage 2.5V > **Important:** Measurement category: CAT IV 600V – CAT III 1000V (IEC/EN61010-1, UL61010-1). ## About this New unit 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.** ## Details - **Price:** 425.0 USD - **Vendor:** HT Instruments - **Type:** Multi Met - **Tags:** HT Instruments, Manufacturers, Meters & DAQ, Multimeter, product_manual_group_1, Product_new ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 425.00 USD | In stock | ## Images - HT Instruments HT401 Professional AC+DC TRMS Multimeter --- > Source: [ValueTronics](https://valuetronics.com/products/ht401-ht-instruments-multimeter-new) > Updated: 2026-06-27