Parameters of inter frequency dielectric loss tester

The instrument is an integrated structure with built-in dielectric bridge, variable frequency power supply, test transformer, and standard capacitor. Adopting frequency conversion anti-interference and Fourier transform digital filtering technology, the measurement is fully automated and intelligent, and the measurement data is very stable under strong interference. The measurement results are displayed on a large LCD screen and come with a built-in micro printer for printing and output.

The instrument measurement circuit includes a standard circuit and a test circuit, as shown in Figure 3.

The standard circuit consists of a built-in high-voltage stability standard capacitor and a standard resistor network. The computer collects the current amplitude and phase difference of the standard circuit and the test circuit in real time, and calculates the capacitance value (CX) and dielectric loss (tg δ) of the tested product.

All data acquisition circuits use high-voltage stabilizing devices, and the acquisition board and acquisition computer are shielded by an iron box floating in the air, while the instrument casing is grounded and shielded; In addition, anti-interference technologies such as optical data, floating ground, large-area ground, single point ground, and digital filtering were used. In addition, the computer processed data from hundreds of power grid cycles, making the measurement results stable, accurate, and reliable.

Accuracy: Cx: ± (reading x 1%+1pF)
TG δ: ± (reading x 1%+0.00040)
Anti interference index: Frequency conversion anti-interference, can still achieve the above accuracy under 200% interference
Capacity range: Internal high voltage: 3pF~60000pF/10kV 60pF~1 μ F/0.5kV
External high voltage: 3pF~0.5 μ F/10kV 60pF~10 μ F/0.5kV
Resolution: z height 0.001pF, 4 significant digits
Range of TG δ: unlimited, resolution of 0.001%, automatic identification of three types of samples: capacitance, inductance, and resistance.
Test current range: 10 μ A~1A
Internal high voltage: Set voltage range: 0.5-10kV Voltage resolution: 1V Accuracy: 2%
Z large output current: 200mA
Pressure rise and fall method: continuous smooth adjustment
Test frequency: 45, 50, 55, 60, 65Hz single frequency
45/55Hz, 55/65Hz, 47.5/52.5Hz automatic dual frequency conversion
Frequency accuracy: ± 0.01Hz
External high voltage: high test current of 1A when connected positively, frequency or variable frequency 40-70Hz
When reversing the wiring, the high test current is 10kV/1A, with a frequency range of 40-70Hz for power or frequency conversion
CVT self-excited low-voltage output: output voltage 3-50V, output current 3-30A
Measurement time: approximately 36 seconds, depending on the measurement method
Input power supply: 180V~270VAC, 50Hz ± 1%, powered by mains or generator
Computer interface: Standard RS232 interface

Parameters of inter frequency dielectric loss tester