Dual clamp multifunctional grounding resistance tester

NegotiableUpdate on 05/12

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Overview

The S490 dual clamp multifunctional grounding resistance tester is designed and manufactured in accordance with the new lightning protection grounding resistance detection standard, specifically for on-site measurement of grounding resistance, soil resistivity, grounding voltage, grounding wire leakage current, AC current, and DC resistance

Product Details

S490Dual clamp multifunctional grounding resistance tester

S490Dual clamp multifunctional grounding resistance testerAlso known as Double Clamp Grounding Resistance Tester or Double Clamp Grounding Resistance Tester, it consists of a main unit, current clamp (Double Clamp), data software, testing line, auxiliary grounding rod, communication line, etc. The main engine is designed in a toolbox style, using polypropylene plastic as raw material and adding new composite fillers for one-time injection molding. It has low density, strength, stiffness, hardness, wear resistance, heat resistance, and excellent insulation performance. Its box can withstand a pressure of about 200kg, ensuring high precision, stability, and reliability in various environmental tests. The host has a large LCD display with backlight and bar chart indication, which is clear at a glance. At the same time, it can store 2000 sets of data, and historical data reading, viewing, saving, reporting, printing and other functions can be achieved through data software.

One Technical Specifications

Function	Measurement of grounding resistance, soil resistivity, DC resistance, conduction resistance, equipotential bonding resistance, grounding voltage, AC current, and leakage current
Power supply	11.1V DC, 2600mAh rechargeable lithium battery
Backlight	Controllable backlight, suitable for use in dark fields
measurement method	Precision four wire, three wire method measurement, simple two wire, selection method, double clamp method measurement of grounding resistance
measurement method	Two three four wire method measurement: pole changing method, short circuit measurement current 20mA Max Selection method measurement: pole changing method, short circuit measurement current 20mA Max Double clamp method: non-contact mutual inductance measurement method, testing current 1mA Max Soil resistivity: Quadrupole method (Wenner method) DC resistance: pole changing method AC current: average rectification (clamp) Ground voltage: average rectification (between P (S) - ES interface)
Range	Measurement of grounding resistance (Re) and DC resistance using the two three four wire method: 0.050Ω to 30000Ω
	Selection method for measuring grounding resistance (Re): 0.05 Ω~3000 Ω
	Double clamp method for measuring grounding resistance (Re): 0.01 Ω~200 Ω
	Soil resistivity (ρ): 0.31 Ω m~9000k Ω m
	Grounding voltage (50Hz/60Hz): AC 0.0V~100.0V
	AC current (50Hz/60Hz): AC 0.00mA~500.0A
resolution	Measurement of grounding resistance (Re) and DC resistance using the two three four wire method: 0.001Ω (0.050Ω to 29.999Ω) 0.01Ω (30.00Ω to 299.99Ω) 0.1Ω (300.0Ω to 2999.9Ω) 1Ω (3000Ω to 30000Ω)
	Selection method for measuring grounding resistance (Re): 0.01Ω (0.05Ω to 29.99Ω) 0.1Ω (30.0Ω to 299.9Ω) 1Ω (300Ω to 3000Ω)
	Double clamp method for measuring grounding resistance (Re): 0.01Ω (0.01Ω to 0.99Ω) 0.1Ω (1.0Ω to 29.9Ω) 1Ω (30Ω to 200Ω)
	Soil resistivity (ρ): 0.01Ωm（0.31Ωm～99.99Ωm） 0.1Ωm（100.0Ωm～999.9Ωm） 1Ωm（1000Ωm～9999Ωm） 10Ωm（10.00kΩm ～99.99kΩm） 100Ωm（100.0kΩm～999.9kΩm） 1kΩm（1000kΩm～9000kΩm）
	Grounding voltage (50Hz/60Hz): 0.1V
	AC current (50Hz/60Hz): 0.01mA
Accuracy Accuracy	Measurement of grounding resistance (Re) and DC resistance (R -) using the two three four wire method: ±10%rdg±50dgt （0.050Ω～0.500Ω） ±2%rdg±0.05Ω （0.500Ω～29.999Ω） ±2%rdg±3dgt （30.00Ω～299.99Ω） ±2%rdg±3dgt （300.0Ω～2999.9Ω） ±4%rdg±3dgt （3.000kΩ～30.00kΩ） Note: 1. The additional error at rC max or rP max is ≤± 5% rdg ± 5dgt. (rC max:4kΩ+100R＜50kΩ, rP max:4kΩ+100R＜50kΩ) 2. The additional error under 5V interference voltage is ≤± 5% rdg ± 5dgt.
	Selection method for measuring grounding resistance (Re): ±2%rdg±10dgt（0.05Ω～0.50Ω） ±2%rdg±5dgt（0.50Ω～29.99Ω） ±2%rdg±3dgt（30.0Ω～299.9Ω） ±2%rdg±3dgt （300Ω～3000Ω）
	Double clamp method for measuring grounding resistance (Re): ±10%rdg±5dgt（0.01Ω～100Ω） ±20%rdg±5dgt（101Ω～200Ω）
	Soil resistivity (ρ): determined by the measurement accuracy of R （ρ=2πaR a:1 m～100m；π=3.14）
	Grounding voltage (50Hz/60Hz): ± 2% rdg ± 3dgt
	AC current (50Hz/60Hz): ± 2% rdg ± 3dgt
Test voltage waveform	sine wave
test frequency	128Hz/111Hz/105Hz/94Hz (automatic frequency selection)
Short circuit test current	AC 20mA max
Open circuit test voltage	AC 40V max
Range of electrode spacing	1m～100m
display mode	6-digit ultra large LCD display with backlight
Measurement indication	LED flashing indication during measurement, LCD countdown display
LCD size	128mm×75mm
LCD display domain	124mm×67mm
Device dimensions	Instrument length, width, and height: approximately 320mm × 275mm × 145mm Current clamp length, width, and height: approximately 220mm × 100mm × 27mm
Package dimensions	Outer packaging length, width, and height: approximately 400mm × 245mm × 335mm
Test line	Red 15m, black 15m, yellow 10m, green 10m each
Simple testing line	2 pieces: 1 red 1.6m, 1 black 1.6m each
Auxiliary grounding rod	4 pieces: 10mm x 200mm in diameter
Current clamp	2: CT1 pliers with red and black plugs, CT2 pliers with blue and black plugs, 1 each
Current clamp diameter	φ70mm
Current clamp lead	2m in length
measure time	AC current: approximately 2 times per second Ground voltage: about 2 times/second Grounding resistance: about 7 seconds/time
number of measurements	More than 5000 times (short circuit test, test once, stop for 30 seconds and then test again)
line voltage	Measurement below AC 100V
communication interface	Equipped with RS232 interface, data storage can be uploaded to the computer through software
Communication line	1 USB to 232 communication cable
data retention	When holding data, the "HOLD" symbol indicates
data storage	2000 sets, "MEM" storage indicator, displaying the "FULL" symbol to indicate that the storage is full
data lookup	When consulting data, the "READ" symbol indicates
Overflow display	The "OL" symbol indicates overflow of over range
Current clamp low current indication	When using the selection method or the double clamp method for measurement, if the current signal received by the CT2 clamp is below 0.5mA, it will display“”Symbol, at this time, the direction of the CT2 current clamp should be checked
Interference testing	Automatically identify interference signals, with interference voltage above 5V indicated by the "Noise" symbol
Auxiliary grounding test	Equipped with auxiliary grounding resistance value testing function, 0.00k Ω~30.00k Ω (100R+rC<50k Ω, 100R+rP<50k Ω)
alarm function	When the measured value exceeds the alarm set value, an alarm prompt of "beep beep beep beep beep" will appear
battery voltage	When the battery voltage is insufficient, the low battery voltage symbol is displayed, reminding that the battery needs to be charged.
Auto Shutdown	Automatically shut down after 15 minutes of startup
Power consumption	Backlight: 25mA Max (separate backlight power consumption) Standby: 25mA Max (backlight off after power on) Measurement: 150mA Max (backlight off)
Quality	Host: 2.66kg (including battery) Total weight: 7.87kg (including test wire, grounding pin, packaging)
hold-all	Toolbox design, capable of bearing 200kg
Working temperature and humidity	-10℃～40℃； Below 80% RH
Storage temperature and humidity	-20℃～60℃； Below 70% RH
overload protection	Measure grounding resistance: AC 280V/3 seconds between ports C (H) - E and P (S) - ES
insulation resistance	20M Ω or above (500V between circuit and casing)
Voltage resistance	AC 3700V/rms (between circuit and casing)
electromagnetic properties	IEC61326(EMC)
Suitable for safety regulations	IEC61010-1 (CAT III 300V, CAT IV 150V, Pollution Level 2); IEC61010-031； IEC61557-1 (Grounding Resistance); IEC61557-5 (soil resistivity); JJG 366-2004 (Grounding Resistance Meter); JJG 1054-2009 (clamp type grounding resistance meter).