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1、Main technical indicators
1) Measurement channel: single channel, (jfd-2c with two independent channels can be purchased if necessary).
2) The capacitance ranges from 6pF to 250 μ F.
3) Detection sensitivity: 0.01pc.
4) Sampling accuracy: 12bit; sampling rate: 20m / s.
5) Show how it works
(1) Display method: ellipse sine line
(2) Trigger synchronization mode: divided into internal and external trigger mode, internal trigger is synchronous trigger of instrument power supply, 50 Hz; external trigger is synchronous test power supply working frequency, any frequency within 50 ~ 400 Hz.
(3) External trigger synchronous signal input voltage: 10 ~ 200V, input power < 1va.
(4) Signal phase determination: ellipse display is polar coordinate mode, sine wave mode is sine wave mode, the starting point of display graph is the zero point of test power supply, and the length of display figure is one cycle of test power supply. Under external trigger synchronous mode, the system can truly and accurately display the period and phase of test power supply.
6) Time window: the phase size can be arbitrarily selected, and the time window can be dynamically enlarged and displayed. The two time windows can be opened separately or simultaneously.
7) Filtering frequency band: the frequency fl of 3dB low frequency end is divided into 10, 20 and 40 kHz, and the frequency FH of 3dB high frequency end is divided into 80, 200 and 300 kHz. FL and FH can flexibly form various filter passbands.
8) Signal amplifier:
(1) Fine adjustment gain (20dB), coarse adjustment gain > 1dB.
(2) The asymmetry of positive and negative polarity response of amplifier: < 1dB.
9) Partial discharge signal measurement: it can measure partial discharge signal in continuous and magnifying display mode with an error of ± 5% (in full scale).
10) It has the functions of data storage, playback, printing and generating standard test report.
11) Working environment temperature: - 10 ~ 45 ℃, relative humidity: ≤ 95%.
12) The power supply is AC220 V, the frequency is 50 Hz, and the power is 30 W.
2、Description of product features
Full digital partial discharge measurement, synchronous sampling, processing and display;
The internal and external synchronization can be selected at will, and has the function of Zero standard indication and phase resolution;
Display mode: freely select three display modes of ellipse, straight line and sine;
Analysis of single discharge pulse waveform to determine the discharge properties;
The test data and waveform can be saved at any time, and the test records saved in the past can be displayed and analyzed again;
Gain range: each channel can be adjusted independently, and the waveform display can be adjusted smoothly at any time without affecting the measurement results;
It can capture and capture special or random waveforms and analyze them in detail;
Anti static interference function can remove the interference signal with fixed phase;
The anti-interference function of correlation filtering technology can effectively remove the random interference which is not synchronized with the power supply;
The band-pass filter adopts analog and digital hybrid filtering technology, and the bandwidth can be arbitrarily combined to effectively suppress all kinds of interference;
Open windows in any phase, single window or double window, and freely open windows within 360 degrees;
It can monitor the test voltage while detecting partial discharge;
Discharge measurement, discharge time and waveform analysis of partial discharge pulse;
2-D and 3-D partial discharge pattern display;
It can store and print partial discharge graph and data arbitrarily, and generate test report automatically.
