Conventional methods for fault detection of voltage meters
Release time：2017-04-07
Author：admin
Clicks：1823
Voltage meter is a kind of common voltage measuring surface, which has certain applications in industry, electronics, power, machinery, gold and other fields. What happens when users have shortcomings in the process of using voltmeters?
The following is a brief introduction to the voltage meter's shortcomings, and I hope it can help us.
Introduction of voltage meters
There are also three terminals in the voltmeter, one of which is negative and the other two are positive. The voltmeter used by students usually has two terminals of 3V and 15V. When the measuring range is "15V" according to the voltage, each large grid on the dial is marked with 5V, and each small grid with 0.5V (that is, the minimum scale value is 0.5V); when the measuring range is "3V", each large grid on the dial is marked with lV, and each small grid with 0.lV (that is, the minimum scale value is 0.5V). That is, the minimum value is 0.l V).
Voltage meter defect view method:
(1) check carefully whether some of the heads are normal.
(2) In the case that the voltmeter pointer can not be shaken and the meter head is normal, if the voltage divider resistance or temperature compensation resistance is open circuit, or the connection line is open circuit formed, then to replace resistance or from scratch welding open circuit point (if compensation resistance is wire-wound can be welded, and welding compensation resistance is necessary to do a good job of insulation after welding compensation resistance Handling operations).
(3) The zero point is normal, the measurement range is not accurate to check the value of the divider resistance, if the value of resistance changes, then to replace or in series (parallel) a resistance to achieve the size of the original divider resistance (adjustable resistance can be adjusted).
(4) The operation is normal at low temperature or just after initial operation, but after a certain period of time, the initial surface defects (especially the measurement errors of noon and sooner or later in hot summer) are mostly caused by a lack of resistance power. Repair methods can be referred to ammeter repair some.
(5) With the use of time added, measurement errors gradually increase the reasons for this shortcoming and repair methods refer to the ammeter repair some.
The following is a brief introduction to the voltage meter's shortcomings, and I hope it can help us.
Introduction of voltage meters
There are also three terminals in the voltmeter, one of which is negative and the other two are positive. The voltmeter used by students usually has two terminals of 3V and 15V. When the measuring range is "15V" according to the voltage, each large grid on the dial is marked with 5V, and each small grid with 0.5V (that is, the minimum scale value is 0.5V); when the measuring range is "3V", each large grid on the dial is marked with lV, and each small grid with 0.lV (that is, the minimum scale value is 0.5V). That is, the minimum value is 0.l V).
Voltage meter defect view method:
(1) check carefully whether some of the heads are normal.
(2) In the case that the voltmeter pointer can not be shaken and the meter head is normal, if the voltage divider resistance or temperature compensation resistance is open circuit, or the connection line is open circuit formed, then to replace resistance or from scratch welding open circuit point (if compensation resistance is wire-wound can be welded, and welding compensation resistance is necessary to do a good job of insulation after welding compensation resistance Handling operations).
(3) The zero point is normal, the measurement range is not accurate to check the value of the divider resistance, if the value of resistance changes, then to replace or in series (parallel) a resistance to achieve the size of the original divider resistance (adjustable resistance can be adjusted).
(4) The operation is normal at low temperature or just after initial operation, but after a certain period of time, the initial surface defects (especially the measurement errors of noon and sooner or later in hot summer) are mostly caused by a lack of resistance power. Repair methods can be referred to ammeter repair some.
(5) With the use of time added, measurement errors gradually increase the reasons for this shortcoming and repair methods refer to the ammeter repair some.