DC resistance test of transformer winding is a transformer in the handover, overhaul and change the tap switch, test items essential. Under normal circumstances, using the traditional method (bridge method and the pressure drop method) DC resistance measurement of transformer winding inductance and high power devices is a time-consuming work. In order to change this situation, to shorten the measurement time and reduce test work burden, rapid testing of the company development of DC resistance. It has the characteristics of small volume, high measuring rapidly, convenient use, accuracy of measurement. Self checking and automatic calibration function reduces the instrument use and maintenance difficulty, the instrument can select automatic or manual operation, is ideal equipment for the measurement of transformer winding and high-power inductance equipment of DC resistance.
The products meet the national standard GB6587-86 "electronic measuring instruments of environmental test" and "general principles of GB6593-86 electronic instrument quality verification rules" requirements. Using four wire measurement method of typical. In order to improve the measuring resistance (especially the accuracy of low resistance). Program controlled constant current source, program-controlled preamplifier, A/D converter constitute the main measuring circuit. The central control unit through the control of constant current source to be tested to the external load by applying a constant current, high accuracy, and then, the obtained data (including test current test voltage, current etc.) for processing, to get the real value of resistance.
The instrument can store 255 test data, and all print the test data storage. The storage instrument reset, power down when the data are not lost.
The main technical parameters
Project technical indexes and parameters of preparing injection
Measuring range 1 ohm to 20K ohm
The test current 0.02 Omega 0.2 Omega 2 and Omega 20 Omega 200 Omega Omega 2K 20K.
10A 10A 1A 100mA 10mA 1mA 0.1mA
The measurement accuracy of + 0.2% (Man Liangcheng)
Display mode: 128 * 64 dot matrix display display for resistance
4 1/2
Mode of operation manual and automatic switching range
The maximum resolution of 1 ohm to 0.02 ohm
Calibration method for automatic calibration
The power of AC 220V + 22V, 50Hz + 2 Hz insurance tube 5A
Maximum power 200W test current of 10A
Work environment temperature: -10 degrees to +40 degrees
Relative humidity: less than or equal to 80%
Dimensions and weight
Volume: 350*310*230 (mm)
Weight: 7kg (accessories)