The TM25R is a high-frequency digital earth tester designed for measuring grounding resistance in power transmission towers and substation grids. It minimizes the impact of guard cables and simplifies the measurement process. Operating at 25kHz, it covers a range of 0-300Ω with compensation for inductive components. The built-in printer and USB interface ensure convenient data recording, and remote control is possible through the TENTECH Android app. The instrument is powered by a rechargeable LFP battery.

Specifications:

Measurement Range: 0 - 300Ω

Frequency: 25kHz

Measurement Current: 20mA (automatically regulated)

Inductive Component Compensation: Built-in capacitor bank, max 4.2μF, resolution 10nF

Resistance Accuracy: ± 2.5% of measured value ± 1 digit

Display: Alphanumeric (LCD)

Max Auxiliary Probe Resistance: 2000Ω for both current and voltage probes

Internal Memory: Up to 2,000 measurements

Data Transfer: Via USB

Software: T-Logger for date/time adjustment, data download, and memory clearing

Power Supply: Built-in rechargeable LiFePO4 12V 6000mA battery

Battery Charger: 12V - 2A

Operating Temperature: -5°C to 50°C

Storage Temperature: -15°C to 65°C

Humidity: Up to 95% RH (non-condensing)

Dimensions: 340 x 295 x 152 mm

Weight: Approx. 4.9 kg

Accessories Included:

8 Copper-Clad Steel Core 50 cm Long Auxiliary Probes

6 Extra 2m Cables for Interconnection of Auxiliary Probes

1 Probe Extractor

1 Shielded 70m Cable

1 Extra Shielded 50m Cable

1 30m Cable for Current Cable Extension

1 70m Cable for Connecting Potential Auxiliary Probe

1 Extra 50m Cable for Connecting Potential Auxiliary Probe

1 Adapter for Connecting Shielded Cable to Current Probe

1 Power Supply

1 Cable for Connection to Unknown Electrode

1 USB Cable

1 Operation Manual

1 T-Logger Software (download)

1 TENTECH Remote Control App (download)

1 Carrying Case for Accessories