Kehui T-900 Hand-held TDR

The Kehui T-900 Hand-held TDR is a compact and easy-to-use instrument for accurately locating open-circuit and low-impedance faults on metallic cables, using time-domain reflectometry (TDR). In this article, we will discuss the main features and benefits of the Kehui T-900 Hand-held TDR.

Features

The Kehui T-900 Hand-held TDR has several features that make it an excellent tool for locating faults on metallic cables. These features include:

• Compact and easy-to-use
• Accurately locates open-circuit and low-impedance faults on metallic cables
• Calculates the velocity of propagation (VOP) of a known length of cable or measures the length of cable on a drum, where the VOP is known
• Available in three versions with 8, 16, or 32 km range
• Digital gain control
• Data transfer via USB flash memory for analysis on a PC
• Compares TDR traces from the three phases of a faulty cable, which can be used to identify differences between them, providing another useful aid to fault location

Benefits

The Kehui T-900 Hand-held TDR provides several benefits to those who use it. These benefits include:

• Accurately locates faults on metallic cables, which is essential for maintenance and repair work
• Compact and easy-to-use, making it an excellent choice for those who need to locate faults on metallic cables
• Calculates the velocity of propagation (VOP) of a known length of cable or measures the length of cable on a drum, where the VOP is known
• Available in three versions with 8, 16, or 32 km range, which provides flexibility for different applications
• Digital gain control, which allows for accurate measurements
• Data transfer via USB flash memory for analysis on a PC, which makes it easy to record and analyze data
• Compares TDR traces from the three phases of a faulty cable, which can be used to identify differences between them, providing another useful aid to fault location

How it Works

The Kehui T-900 Hand-held TDR uses time-domain reflectometry (TDR) to locate faults on metallic cables. TDR works by sending a pulse down the cable and measuring the time it takes for the pulse to reflect back from the fault. The T-900 can calculate the velocity of propagation (VOP) of a known length of cable or measure the length of cable on a drum, where the VOP is known. The unit can also compare TDR traces from the three phases of a faulty cable, which can be used to identify differences between them, providing another useful aid to fault location.

Kehui T-900 Hand-held TDR Specifications:

• Range: 8km (16 and 32km are also available as options)
• Accuracy: ±0.5% of range
• Resolution: Minimum resolution 1m
• Pulse: ±30v, 40ns-10us with automatic adjustment
• Sampling rate: 100MHz
• Balance: 25 – 300Ω automatically adjusted
• Velocity of propagation: 40-300m/µs
• Dead zone: There is no dead zone
• Power consumption: 1W
• Batteries: Lithium, 2 pcs of 18650 batteries in series
• Charger Input: AC110-240V, output: 8.4V
• Battery life: 10 hours
• Dimensions: 204 x 100 x 36 mm
• Weight: 0.38kg
• Operating temperature: -15 °C to +50 °C
• Ingress Protection: IP53