Product Details

The instrument has built-in anti-interference measures to ensure accurate measurement under external electric field interference. Control panel: printer, keyboard, display, and communication relay. Variable frequency power supply: uses SPWM switching circuit to produce high-power sine wave regulated output.
Step-up transformer: boosts the variable frequency power supply output to the measurement voltage, with a maximum reactive power output of 2KVA/1 minute.
Standard capacitor: internal Cn, measurement reference.
Cn current detection: used to detect the current of the internal standard capacitor, 10μA～1A. Input resistance <2Ω.
Cx positive wiring current detection: only for positive wiring measurement, 10μA～1A. Input resistance <2Ω. Cx reverse wiring current detection: only for reverse wiring measurement, 10μA～1A. Input resistance <2Ω.
Reverse wiring digital isolation communication: uses precision MPPM digital modulation demodulator to transmit the reverse wiring current signal
to the low-voltage side. Isolation voltage 20KV.

Technical Parameters:
1. High voltage output:
0.5～10kV, each step increases by 500V, a total of ten steps, capacity: 1000VA
2. Accuracy:
tgδ: ± (reading * 1.0% + 0.08%)
Cx: ± (reading * 1.5% + 5PF)
3. Resolution: tgδ: 0.01% Cx: 1pF
4. Measurement range: 0.1% < tgδ < 50%
3PF < Cx < 60000PF
At 10KV, Cx≤30000PF
At 5KV, Cx≤60000PF
5. Power supply: AC 220V ±10% 50 ±1Hz 
6. Power harmonic adaptability: ≤3%
7. Operating conditions: -15℃－50℃ relative humidity <80% 
8. Dimensions: 460 (L) ×335 (W) ×340 (H)
9. Weight: 30 kg

Working Principle:
Under the action of AC voltage, the dielectric consumes part of the electrical energy, which is converted into heat energy and causes loss. This energy loss is called dielectric loss. When AC voltage is applied to the dielectric, there is a phase angle difference Ψ between the voltage and current in the dielectric, and the complementary angle δ of Ψ is called the dielectric loss angle,
The tangent tgδ of δ is called the dielectric loss tangent. The tgδ value is a parameter used to measure dielectric loss. The instrument measurement circuit includes a standard circuit (Cn) and a test circuit (Cx),
as shown in Figure 1. The standard circuit consists of a built-in high-stability standard capacitor and the measurement circuit, and the test circuit consists of the test object and the measurement circuit. The measurement circuit consists of a sampling resistor, a preamplifier, and an A/D converter. Through the measurement circuit, the amplitude and phase of the standard circuit current and the test circuit current are measured respectively, and then the microcontroller uses digital real-time acquisition methods and vector operations to obtain the capacitance value and dielectric loss tangent of the test object.

Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.