KDD400 is widely used in telecommunications, power, meteorology, computer rooms, oil fields, power distribution lines, iron tower transmission lines, gas stations, factory grounding grids, lightning rods, etc. Instruments have the characteristics of precise, fast, simple, stable and reliable testing. KDD400 is controlled by a microprocessor and can accurately detect grounding resistance, soil resistivity, grounding voltage, DC voltage, DC resistance, and AC current. It uses fast filtering technology to minimize interference. Displaying the resistance value of auxiliary electrodes on the same screen facilitates the determination of measurement errors caused by environmental factors and facilitates more accurate measurement of the true grounding resistance value. Simultaneously store 500 sets of data, connect to a mobile app via Bluetooth, or connect to a computer via USB to achieve wireless or wired remote measurement, read historical data, export report analysis, and other functions. It has functions such as numerical retention and intelligent alarm prompts.

Core functions and features
Multi parameter measurement capability
Supports measurement of six types of parameters, including grounding resistance, soil resistivity, DC/AC voltage, DC resistance, and AC current.
Adopting the pole changing method and non-contact mutual inductance method (double clamp method) to meet different testing requirements (such as precision four wire method, simple two wire method, etc.).
Fast filtering technology effectively reduces environmental interference and improves measurement accuracy.
Intelligence and Convenience
Display the resistance value of auxiliary electrodes on the same screen: it intuitively reflects the impact of environmental interference on measurement and facilitates error correction.
Data storage and transmission: Supports 500 sets of data storage, enabling wireless/wired remote monitoring, historical data reading, and report export through Bluetooth mobile app or USB computer upper computer.
Intelligent alarm and numerical maintenance: When the set threshold is exceeded, an alarm prompt is triggered, which facilitates real-time monitoring of key parameters.
Multi scenario adaptability
Supports diverse measurement methods such as the two three four line method and the double clamp method, suitable for complex environments such as iron towers, transmission lines, gas stations, etc.
The non-contact double clamp method (maximum test current 40mA) reduces wiring requirements and improves operational efficiency.
 

The KDD400 consists of a host, PC upper computer software, mobile APP software, test cable, USB cable, charger, and grounding pin. The functions include two, three, four wire AC grounding resistance, soil resistivity, three/four wire selection method, double clamp resistance, DC resistance, AC voltage, DC voltage, and AC current.


Environmental temperature and humidity: 23 ℃± 5 ℃, below 75% RH
Interference voltage:<20V (should be avoided)
Interference current:<2A (should be avoided)
Electrode spacing during R measurement: a>5d
Electrode spacing for measuring ρ: a>20h
Power supply: 11.1V lithium battery (built-in) can continuously measure over 1000 times when fully charged in AC resistance mode
Screen brightness: controllable, users can adjust according to the scene
Measurement methods: Precision four wire, three wire method, simple two wire, selection method, double clamp method for measuring grounding resistance
Measurement method: 2-3 wire method Measurement: pole changing method, measuring current 42.0mA Max
Soil resistivity: Quadrupole method
Selection method measurement: pole changing method, measuring current 42.0mA Max
Double clamp method: non-contact mutual inductance measurement method, testing current 40mA Max
DC resistance: pole changing method
AC current: average rectification (clamp)
Grounding voltage: average rectification (between S-ES interfaces)
DC voltage: average value rectification (between S-ES interfaces)
Test voltage waveform: sine wave
Test frequency: 128Hz
Open circuit test voltage: AC 30.0V Max DC 30.0V Max
Electrode spacing range: 0.1m to 100.0m
Display mode: Color display screen
Instrument dimensions: length, width, and height: 277.2mm × 227.5mm × 153mm
Current clamp size: length, thickness, height: 101mm × 27mm × 214mm
Test lines: 4: 1 red 15m, 1 black 15m, 1 yellow 10m, and 1 green 10m each
Simple testing lines: 2: 1 yellow 1.5m, 1 green 1.5m each
Auxiliary grounding rod: 4 pieces: φ 10mm × 200mm
Current clamp: banana plug * 1, audio plug * 1
Current clamp diameter: 50mm
Current clamp lead: 2m long
Measurement time: AC current: about 3 times/second
Ground voltage: about 3 times/second
Grounding resistance and soil resistivity: about 10 seconds/time
USB interface: With a USB interface, data storage can be uploaded to the computer through software
Bluetooth connection: Yes, it can provide real-time monitoring and data reading functions for mobile phones
Communication cable: 1 USB communication cable, 1.5m long
Data storage: 500 sets, displaying the "FULL" symbol indicates that the storage is full
Overflow display: The "OL" symbol indicates overflow when the range exceeds the limit
Auxiliary grounding test: with auxiliary grounding resistance value testing function, 0.00k Ω~200.00k Ω
Alarm function: When the measured value exceeds the alarm set value, an alarm prompt will be issued
Automatic shutdown: "APO" indicator, automatically shuts down after 15 minutes of startup (default)
Power consumption: Screen brightness: 190mA Max (maximum brightness) 140mA Min (minimum brightness); Measurement: 200mA Max (maximum brightness) 150mA Min (minimum brightness)
Quality: Instrument: 1975g (including battery); Current clamp: 940g (2 pieces); Test line: 1300g (including simple test line); Auxiliary grounding rod: 850g (4 pieces)
Working temperature and humidity: -10 ℃ to 40 ℃; Below 80% RH
Storage temperature and humidity: -20 ℃ to 60 ℃; Below 70% RH
Overload protection: Measure grounding resistance: AC 280V/3 seconds between ports H-E and S-ES
Insulation resistance: above 20M Ω (500V between the circuit and the casing)
Voltage resistance: AC 3700V/rms (between circuit and casing)
Electromagnetic characteristics: 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).