Electrical test

DC resistance

DC resistance is the resistance of the component when DC is applied, that is, the inherent and static resistance of the component.

Ppms-9 physical performance measurement system, after different configuration, can carry out physical performance measurement for different purposes, including electrical properties, magnetic properties, thermal properties, etc.

Measurable: 1. DC resistance, 2. AC resistance, 3. Hall effect, 4. I-V characteristics, 5. Critical current, 6. DC magnetization, 7. Ac susceptibility, 8. Torque magnetization measurement, 9. Specific heat, 10. Thermal conductivity, 11. Thermal potential, 12. Figure of merit, 13. Ultra-low field is relatively positive. The above measurement can be carried out with variable temperature and variable magnetic field and operated continuously at low temperature.

Main specifications and technical indicators

1. Provide 1.9k-400k measuring temperature and 0 ~ ± 9tesla magnetic field.

2. VSM sensitivity: 2 × 10-7 EMU to 3 EMU.

3. ACMS sensitivity: 2 × 10-5emu to 5emu; DC magnetization: 2.5 × 10-5emu to 5emu.

4. Specific heat measurement: resolution: 10nJ / k @ 2K.

5. Electronic transport property measurement: current 10 μ a to 2a, voltage range ± 5V, noise range: 5nv / Hz @ 1kHz

6. Thermal conductivity: 0.5 ~ 1000 W / m * k temperature range 1.9 ~ 400k

The requirements for samples vary greatly from measurement to measurement. In general, the requirements are as follows:

The sample must be dry solid or powder with certain chemical and physical stability. It will not volatilize in vacuum, without radioactivity and corrosiveness. The sample volume should not be too large. Please indicate what elements the sample contains.

Magnetic measurement: the sample shape is not required for solid powder; conductivity thermal conductivity: 3 × 3 × 20mm or Φ 6mm × 2mm

AC resistance

Alternating current resistance is the resistance of the component when it is connected with alternating current.

Thermal potential

Two kinds of material conductors with different components form a closed circuit. When there is a temperature gradient at both ends, there will be current passing through the circuit. At this time, there will be electromotive force thermoelectric EMF between the two ends, which is called Seebeck effect. The thermocouple uses this principle to measure temperature.

Hysteresis loop

Under the action of strong alternating electric field, the polarization intensity P of ferroelectrics changes nonlinearly with the external electric field, and in a certain temperature range, P shows the double value function of electric field E, showing the hysteresis phenomenon. This P-E (or D-E) loop is called hysteresis loop.

Resistance measurement

Performance parameters:

1. Output voltage: NC 1V ～ 1000VDC

2. Basic accuracy: < 10g: 3% ≥ 10g: 5% ≥ 100g: 10%

3. Test range: 10k-1t Ω (104 ~ 1012 Ω)

4. Reading: 9999

5. Range: automatic and manual

6. Test speed: 55 times / s, 15 times / s, 3 times / S

7. Correction: full range open circuit clearing

8. Comparator: 30 records, Gd / ng response: Gd, ng, off settings

9. Interface: RS-232C, handler interface

Function purpose:

1. it can measure the resistivity of semiconductors and insulating materials. It is used for field test or timing test and destructive test.

2. test the insulation resistance and leakage current of switchgear, relay, motor, generator and cable.

3. Insulation resistance measurement of electronic components and equipment such as capacitors.

4. Measurement of insulation resistance of dielectric materials, wires and cables, etc.

5. The best solution of capacitor separator.

Performance parameters:

1. Fast and very low noise, 15nvp-p noise @ 1s response time, 40-50nv P-P noise @ 60s response time

2. Delta mode measurement, low resistance test with reverse polarity of program-controlled current source, up to 24Hz and 30nv P-P noise

3. With the power supply synchronization technology, 110dB series mode rejection (nmrr) can be provided to minimize the impact of AC common mode current

4. Dual channel input, which can measure voltage, temperature or the ratio of unknown resistance to reference resistance

5. Built in thermocouple linearization and cold end compensation function

Function purpose:

1. Low resistance measurement of materials, LRC measurement of electronic components and equipment such as capacitor inductor impedance.

2. Measurement of dielectric parameters of dielectric materials.

Test sample delivery requirements:

Sample 2 × 2 × 30mm or Φ 3mm × 30mm

Magnetoimpedance test of amorphous materials

Performance parameters:

1. System control host: 1 constant current source 0.3ma-50ma; 2 4 1 / 2 digital voltmeters; 1 USB interface 24bit data acquisition card; power consumption: < 50W.

2. Automatic scanning power supply: 0 ~ ± 5a, magnetic field scanning rate: 0.01a/s ~ 1.0a/s.

3. Helmholtz coil: 0 ~ ± 150gs; diameter: Φ 260mm; uniform area: 30x30mm.

4. Technical parameters of probe circuit: dynamic range of input signal: ± 30 dB; sensitivity of output level: 30 mV / db; output current: 8 Ma; conversion rate: 25 V / μ s; phase measurement range: 0-180 °; conversion rate at phase output: 30 MHz; response time: 40 ns-500 NS; measurement collet interval: 10 mm.

5. Computer: PC compatible computer, Windows XP, Windows 7 operating system.

6. Data collection software: running environment: Windows XP, Windows 7 operating system.

Function purpose:

The magnetic impedance characteristics of amorphous materials can be measured: Z / Θ, R / X random magnetic field changes, frequency range 1MHz-40MHz.

Test sample delivery requirements:

The length of filament sample is more than 10 mm