HF-MT-508 Insulation Resistance Tester Calibrator

Description

HF-MT-508 Insulation Resistance Tester Calibrator is developed in accordance with JJG622‑1997, JJG1005‑2005 and JJG1072‑2011 verification regulations. It is equipped with separate leakage‑shield terminal and grounding terminal.

It can verify various imported & domestic analog and digital insulation resistance meters, and can also be used as DC standard high‑value resistance device with long service life and mechanical durability.

Measuring range: 100Ω ~ 20GΩ, adjustment resolution: 100Ω.

For its built‑in voltage‑measuring section: nominal test voltage is 3 kV DC, input impedance ≥10 GΩ. It is capable of measuring open‑circuit voltage, mid‑scale voltage and peak voltage of megohmmeters.

Main Technical Specifications

Accuracy Class & Working Voltage / Current

Resistance Value	10 GΩ	×1 GΩ	×100 MΩ	×10 MΩ	×1 MΩ
Accuracy Class	2	2	1	0.5	0.2
Nominal Voltage (V)	2500	2500	2500	1500	800

Resistance Value	×100 kΩ	×10 kΩ	×1 kΩ	×100 Ω
Accuracy Class	0.2	0.2	0.2	0.2
Nominal Current (mA)	1	5	10	10

General Technical Parameters

Item	Specification
Adjustment Range	100Ω ~ 20 GΩ; adjustment resolution: 100Ω
Reference Temperature	17 ℃ ~ 23 ℃
Nominal Operating Temperature	15 ℃ ~ 25 ℃
Reference Relative Humidity	30% ~ 60%
Nominal Operating Relative Humidity	25% ~ 75%
Insulation Resistance	≥1 GΩ (between internal circuit and isolated external metal parts, under nominal voltage)
Dielectric Strength	Withstand 3.75 kV AC (45‑65 Hz) for 1 min, no breakdown or flash‑over (internal circuit to reference grounding terminal)
Residual Resistance at Output Terminal	Residual resistance ＜1 Ω, resistance variation ＜0.1 Ω
Overall Dimensions	442 mm × 270 mm × 145 mm
Weight	5 kg

FAQ — Insulation Resistance Tester Calibrator

Q1: What is the main purpose of this calibrator?

A1: It is a standard high‑resistance source for calibrating analog and digital insulation resistance testers (megohmmeters). It can also serve as DC standard high‑value resistance for metrology laboratory work.

Q2: What is its resistance adjustment range and resolution?

A2: Adjustment range: 100Ω ~ 20 GΩ; adjustment resolution: 100Ω. Multiple resistance decades with different accuracy classes are available.

Q3: Can it measure the output voltage of megohmmeters under test?

A3: Yes. Its built‑in voltage‑measuring part has nominal test voltage 3 kV DC and input impedance ≥10 GΩ. It can test open‑circuit voltage, mid‑scale voltage and peak voltage of megohmmeters.

Q4: What are the requirements for operating environment?

A4: Reference temperature:17‑23℃; nominal operating temperature:15‑25℃. Reference humidity 30%‑60%; nominal operating humidity 25%‑75%.

Q5: About insulation and dielectric strength performance?

A5: Insulation resistance ≥1 GΩ under nominal voltage. It can withstand 3.75 kV AC (45‑65 Hz) for 1 min without breakdown or flash‑over.

Q6: What is the residual resistance of output terminal?

A6: Residual resistance ＜1 Ω, resistance variation ＜0.1 Ω, which minimizes extra error during calibration.

Q7: Which metrology regulations does this instrument comply with?

A7: Designed per JJG622‑1997, JJG1005‑2005, JJG1072‑2011 verification regulations for insulation resistance meters.

Q8: What is the dimension and weight?

A8: Dimensions: 442 mm×270 mm×145 mm; weight: 5 kg, equipped with independent leakage‑shield terminal and grounding terminal.