Precautions for the use of digital voltmeters - Solutions - Huaqiang Electronic Network

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

TP-IP4220CZ6 5V 0.35PF breakdown voltage 6V SOT

Shunuo varistor / ESD varistor / product complete / Sunlord first-class agent

24V, 17pF, surface mount CAN bus ESD protection diode

SMD aluminum electrolytic capacitor

(1) Perform a visual inspection before use to see if there is any damage or missing parts. If any of the above, it should be excluded first.

(2) The AC input voltage is divided into 220 volts and 110 volts.

(3) The use environment of the digital voltmeter, especially the temperature and humidity conditions must be strictly observed, otherwise the error will be very large.

(4) For the voltmeter with the standard electric meter attached, it is strictly prohibited to tilt at a large angle. Invert, if necessary, the standard battery can be removed to prevent damage.

(5) The type of digital voltmeter input signal (DC voltage, AC voltage, etc.) must correspond to the measurement dimension of the meter. It is best not to over-range input when using. It is strictly prohibited to exceed the maximum input voltage specified by the meter.

(6) Pay attention to the shielding and grounding of the signal source and input lead of the æ³…0 to reduce the influence of string and common mode interference.

(7) Pay attention to the error of the instrument in the actual use state, that is, within a range, the measured voltage value is different, and the error is also different, which can be calculated according to the error formula.

(8) Due to the zero current of the meter and the limited input impedance, pay attention to the error caused by the internal resistance of the signal source under test.