# HT Italia HT8100 Professional TRMS Multimeter + Process Calibrator

# HT Italia HT8100 Professional TRMS Multimeter + Process Calibrator

## Key Features At A Glance

-   Combined TRMS digital multimeter and process calibrator in a single handheld instrument
-   5-digit display with 50000-count maximum reading, sign, automatic polarity, and OL over-range indication
-   TRMS AC voltage and current measurement across a 40Hz to 10kHz frequency range
-   Programmable DC current generation: 0–20mA and 4–20mA outputs with linear and step ramp profiles
-   Loop power supply with 250Ω HART communication resistor (drivers 30V/1.25k and 24V/1k)
-   DC voltage to 1000V, AC TRMS to 1000V, resistance to 50MΩ, frequency to 100kHz
-   AC+DC, HFR (800Hz cut-off), AUTOTEST, MAX/MIN/AVG, REL, Data HOLD, and 100-location internal memory
-   CAT IV 600V / CAT III 1000V rated, double insulation, per IEC/EN61010-1 and EN61010-2-030

The HT8100 is a professional TRMS multimeter paired with a process calibrator, manufactured by HT Italia (HT Instruments). It pairs a 5-digit measuring display—capable of a 50000-count maximum reading with sign, automatic polarity indication, and an “OL” over-range indication—with a source side that generates and supplies controlled current, bringing measurement and calibration capability together in one instrument.

On the measurement side, the HT8100 reads DC and TRMS AC voltage, DC and TRMS AC current, resistance, frequency, continuity, and diodes. On the source side, it generates programmable DC current and supplies loop power with a 250Ω HART communication resistor, supporting process-loop work where a single tool both reads and drives the loop. Operating modes include AUTOTEST for automatic AC/DC detection, AC+DC for measuring a DC component overlapped on an alternating signal, and HFR for AC voltage measurement with an 800Hz cut-off frequency.

ValueTronics stocks and holds its own inventory in a 20,000 sq ft secure warehouse at 1675 Cambridge Drive in Elgin, Illinois, so the equipment you order is sourced and managed under one roof.

## Product Core & Specifications

Specification

Value

DC Voltage (Input impedance 10 MΩ // <100 pF; Overload protection 1000 VDC/ACrms; Accuracy at 23°C ±5°C, <80%HR)

50.000 mV (res 0.001 mV)

±(0.05%rdg + 30dgt)

500.00 mV (res 0.01 mV)

±(0.05%rdg + 5dgt)

5.0000 V (res 0.0001 V)

±(0.05%rdg + 5dgt)

50.000 V (res 0.001 V)

±(0.05%rdg + 5dgt)

500.00 V (res 0.01 V)

±(0.05%rdg + 5dgt)

1000.0 V (res 0.1 V)

±(0.05%rdg + 5dgt)

AC TRMS Voltage (Sinusoidal waveform; Frequency range 40Hz ÷ 10kHz; Input impedance 10 MΩ // <100 pF; Overload protection 1000 VDC/ACrms)

50.000 mV (res 0.001 mV)

±(0.7%rdg + 20dgt) (40Hz ÷ 70Hz); ±(1.5%rdg + 40dgt) (71Hz ÷ 10kHz)

500.00 mV (res 0.01 mV)

±(0.7%rdg + 20dgt) (40Hz ÷ 70Hz); ±(1.5%rdg + 40dgt) (71Hz ÷ 10kHz)

5.0000 V (res 0.0001 V)

±(0.5%rdg + 20dgt) (40Hz ÷ 70Hz); ±(1.5%rdg + 40dgt) (71Hz ÷ 1kHz); ±(3.0%rdg + 80dgt) (1.001kHz ÷ 10kHz)

50.000 V (res 0.001 V)

±(0.5%rdg + 20dgt) (40Hz ÷ 70Hz); ±(1.5%rdg + 40dgt) (71Hz ÷ 1kHz); ±(3.0%rdg + 80dgt) (1.001kHz ÷ 10kHz)

500.00 V (res 0.01 V)

±(0.5%rdg + 20dgt) (40Hz ÷ 70Hz); ±(1.5%rdg + 40dgt) (71Hz ÷ 1kHz); ±(3.0%rdg + 80dgt) (1.001kHz ÷ 10kHz)

1000.0 V (res 0.1 V; frequency range 40Hz ÷ 1kHz)

±(0.5%rdg + 20dgt) (40Hz ÷ 70Hz); ±(1.5%rdg + 40dgt) (71Hz ÷ 1kHz)

AC Voltage notes

For values <5% of each range add 20dgt to the accuracy. Crest factor (CF) for non-sinusoidal: 1.4≤CF<2.0 add 1.0%rdg; 2.0≤CF<2.5 add 2.5%rdg; 2.5≤CF≤3.0 add 4.0%rdg. AC+DC mode: AC accuracy + DC accuracy + 1.0%rdg. HFR mode: AC accuracy + 1.0%rdg (40Hz÷400Hz); cutting frequency 800Hz (-3dB); characteristic attenuation approx -24dB.

DC Current (Max. meas. time 1min input A / 10min input mA; Overload protection max 440mA)

50.000 mA (res 0.001 mA)

±(0.05%rdg + 5dgt)

1.0000 A (res 0.0001 A)

±(0.05%rdg + 5dgt)

AC TRMS Current (Frequency range 40Hz ÷ 10kHz; Input impedance 0.1Ω input A, 13Ω input mA; Max. meas. time 1min input A / 10min input mA; Overload protection max 440mA)

50.000 mA (res 0.001 mA)

±(1.0%rdg + 20dgt) (40Hz ÷ 70Hz); ±(2.0%rdg + 20dgt) (71Hz ÷ 10kHz)

1.0000 A (res 0.0001 A)

±(1.0%rdg + 20dgt) (40Hz ÷ 70Hz); ±(2.0%rdg + 20dgt) (71Hz ÷ 10kHz)

Resistance (Overload protection 1000 VDC/ACrms; Max open voltage approx 3.5V)

500.00 Ω (res 0.01 Ω; output current 1mA)

±(0.2%rdg + 30dgt)

5.0000 kΩ (res 0.0001 kΩ; output current 100µA)

±(0.2%rdg + 10dgt)

50.000 kΩ (res 0.001 kΩ; output current 10µA)

±(0.2%rdg + 10dgt)

500.00 kΩ (res 0.01 kΩ; output current 1µA)

±(0.5%rdg + 10dgt)

5.0000 MΩ (res 0.0001 MΩ; output current 100nA)

±(1.0%rdg + 10dgt)

50.000 MΩ (res 0.001 MΩ; output current 10nA)

±(2.0%rdg + 10dgt); little instability for <20 dgt

Continuity Test

500.0 Ω (buzzer <30Ω)

±(0.1%rdg + 30dgt); open voltage approx 3.5V; overload protection 1000 VDC/ACrms

Diode Test

2.000 V (test current 1mA)

±(1.0%rdg + 10dgt); open voltage approx 3V; overload protection 1000 VDC/ACrms

Frequency (AC Voltage/Current) (Minimum frequency value 5Hz; Overload protection 1000 VDC/ACrms, max 440mA)

500.00 Hz (res 0.01 Hz)

±3dgt

5.0000 kHz (res 0.0001 kHz)

±3dgt

50.000 kHz (res 0.001 kHz)

±3dgt

100.00 kHz (res 0.01 kHz)

±3dgt

Sensitivity of Signal for Frequency Measurement (peak to peak value)

AC mV 50.000mV / 500.00mV

10mV (5Hz ÷ 10kHz); 100mV (10kHz ÷ 100kHz)

AC V 5.0000V

1V (5Hz ÷ 10kHz); 1V (10kHz ÷ 100kHz)

AC V 50.000V / 500.00V / 1000.0V

1V (5Hz ÷ 10kHz); not specified (10kHz ÷ 100kHz)

AC A 50.000mA / 1.000A

10mA (5Hz ÷ 10kHz); 300mA (10kHz ÷ 100kHz)

Generated DC Current – Programmable Output (Power supply: battery level >4.5V; External power supply simulated mode 6V ÷ 48V; Overload protection max 440mA)

0.000 ÷ 20.000 mA (res 0.001 mA)

±(0.05%rdg + 5dgt)

4.000 ÷ 20.000 mA (res 0.001 mA)

±(0.05%rdg + 5dgt)

Generated DC Current – Output Ramp (Output voltage 32.0 VDC, accuracy ±5.0% of reading; Power supply: battery level >4.5V; External power supply simulation mode 6V ÷ 48V)

Linear slow ramp

0% → 100% → 0% in 40s

Linear fast ramp

0% → 100% → 0% in 20s

Step slow ramp

0% → 100% → 0% with steps of 15s

Step fast ramp

0% → 100% → 0% with steps of 5s

Loop Power (Loop current) (Output voltage 32.0 VDC, accuracy ±5.0% of reading; Power supply: battery level >4.5V; External power supply simulation mode 6V ÷ 48V; Overload protection max 440mA)

LOOP 50.000 mA

±(0.05%rdg + 5dgt); driver 30V / 1.25kΩ

250Ω HART

driver 24V / 1kΩ

General Specifications

Display

LCD display, 5 digit with maximum reading 50000 counts with sign, decimal point; automatic polarity indication; “OL” over range indication

Features

Data HOLD; MAX/MIN/AVG; Auto Backlight; AUTOTEST (auto AC/DC detection); AC+DC; HFR (800Hz cut-off); Internal memory save/recall; RANGE (manual range); REL (relative measurement)

Internal memory

Max 100 locations

Auto Power OFF

After 20 minutes of idleness

Low battery indication

Symbol appears when battery voltage is low

Working temperature/humidity

\-10°C ÷ 30°C, <85%RH; 30°C ÷ 40°C, <75%RH; 40°C ÷ 50°C, <45%RH

Storage temperature/humidity

\-20°C ÷ 60°C, <80%HR

Max height of use

2000 m

Pollution degree

2

Insulation

Double insulation

Power supply

4 x 1.5V alkaline batteries type AA IEC LR6

Sizes

207(L) x 95(W) x 52(H) mm

Weight (included batteries)

630 g

Applied standards – Safety

IEC/EN61010-1, EN61010-2-030

Measurement category

CAT IV 600V – CAT III 1000V

> **Important:** Measurement category: CAT IV 600V / CAT III 1000V.

> **Important:** Generation functions (programmable DC current output, output ramp, loop power) require battery level >4.5V; external power supply in simulation mode 6V ÷ 48V.

## 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:** 925.0 USD
- **Vendor:** HT Italia
- **Type:** Process Cali
- **Tags:** Calibrator, HT Instruments, Manufacturers, Other Equipment, Process, product_manual_group_2, Product_new

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 925.00 USD | In stock |

## Images

- HT Italia HT8100 Professional TRMS Multimeter + Process Calibrator

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> Source: [ValueTronics](https://valuetronics.com/products/ht8100-ht-instruments-process-calibrator-new)
> Updated: 2026-06-20