PC36C DC Resistance Measuring Instrument

Product Introduction:

PC36C DC Resistance Measuring InstrumentIt is a specialized instrument for measuring the DC resistance of wire and cable conductors. The technical performance of the instrument should fully meet the technical requirements of GB/T3048.4 Test Methods for Electrical Performance of Wire and Cable Conductors DC Resistance Test for measuring equipment. The measurement should be fast, accurate, stable in reading, and easy to use. It is an updated product of QJ57 and QJ36 electric bridges. Compared with similar digital micro ohmmeters, this instrument has the following characteristics:

1. High measurement sensitivity and resolution. PC36A and PC36C are set to a range of 200 μ Ω, with a maximum resolution of 0.01 μ Ω (10-8 Ω), which is 10 times higher than the maximum resolution of existing digital micro ohmmeters. This instrument adopts a high-sensitivity and low-noise nanovolt amplifier developed with new technology, with a voltage sensitivity of 100nV (0.1 μ V), which has reached the technical level of a 6 1/2-digit digital voltmeter. The instrument has * measurement sensitivity and resolution in the "high-resolution" measurement state (low measurement current, high sensitivity). When measuring a 1-meter copper wire with a cross-section of 100mm2 using 10A current, there are 5 valid readings. When measuring a 1-meter copper wire with a cross-section of 1000mm2, there are also 4 valid readings, which is an order of magnitude higher than existing digital low resistance meters. It is particularly suitable for measuring ultra large cross-section wires and ultra small cross-section micro wires.

2. Multi current measurement function. The various ranges of this instrument are set with different measurement currents to choose from, which are indicated on the instrument panel. This performance overcomes the current limitation of digital resistance instruments and some bridges (such as QJ57) that cannot adjust the measured current, and the problem of excessive current in certain gears causing the measured conductor to heat up.

3. Rate current measurement function. In order to facilitate the implementation of the method in GB/T 3048.4, Article 5.6, which uses two measuring currents with a ratio of l: 1.41 to test the resistance value of the sample separately and determine whether the temperature rise exceeds the standard, this instrument is equipped with three levels of current with a ratio of 0.707:1.00: 1.41 for switching, avoiding the loss of measurement accuracy and resolution caused by changing the range gear to reduce the measuring current.

4. External thermoelectric balance function. In order to reduce the influence of external contact potential and thermoelectric potential at the potential end on the measurement results, this instrument is equipped with an external potential balance adjustment device. This method is one of the recommended methods in GB/T 3048.2 Test Methods for Electrical Properties of Wires and Cables - Metal Conductor Material Resistance Test, Section 6.5.3.

5. Reverse current measurement function. According to Article 5.5 of GB/T 3048.5, when the resistance of the sample is less than 0.1 Ω, the current should be measured again in reverse and the arithmetic mean should be taken. In the bridge method, this function is achieved by switching the external commutation switch, while digital micro ohmmeters usually do not allow current reversal and cannot achieve the standard operation requirements. This instrument adopts a specially designed bidirectional current protection circuit, which allows for reverse current measurement, and a high-power commutation relay is installed inside the instrument. The current commutation operation is implemented through a panel switch, which is simple to operate and easy to use.

6. Temperature correction function for copper and aluminum wires.PC36C DC Resistance Measuring InstrumentWhen the test environment temperature is within the range of 1525 ℃, by setting the temperature correction switch of PC36C or PC36D, the instrument will automatically convert the resistance value of the tested copper or aluminum wire to the resistance value of the wire at the reference temperature of 20 ℃ according to the recommended formula in GB/T3048.4.

7. This series of products adopts high-quality aluminum alloy boxes, which are sturdy and beautiful. The instrument adopts imported integrated circuits and is carefully selected internally. The standard resistor is made of precision manganese copper material and undergoes special aging process, with a relatively low temperature coefficient, which can ensure measurement accuracy and long-term stability. It is an ideal choice for high-resolution and precise measurement of various low value resistors.