After replacement of a scale or other repair it is necessary to check the accuracy of indications or to otgraduirovat a voltmeter scale. Such check can be made in several simple ways. Depending on the necessary accuracy and available devices, use one of the ways described below.
It is required to you
- the power supply with the built-in voltmeter, the power supply of 12 Volts, the variable wire resistor on 1 kOhm, a bulb on 12 Volts, the reference voltmeter, connecting wires, the measuring device for food of chains of variable and constant currents of UI300.1 type.
Instruction
1. Connect the checked voltmeter to the power supply with the built-in voltmeter. Establish by the regulator of output voltage of the block the output voltage of 1 Volt. Note situation on which stopped his shooter on a scale of the checked voltmeter. Consistently carrying out this operation with a step to 1 Volt, mark all scale of the second device. After that dump tension from the power supply to a minimum and disconnect it. Then mark intermediate values of a scale of the voltmeter. If scaleto it turns out nonlinear, a marking of intermediate values you cause in proportion arrangements of the main marking. This way gives a marking with a low accuracy of graduation which is limited to the accuracy of indications of the voltmeter on the power supply.
2. The second way in which the reference voltmeter is used gives the big accuracy of graduation. Connect consistently variable resistor and a bulb on 12 Volts. In parallel connect the reference and checked voltmeters to a bulb. Connect a free conclusion of the resistor and the second wire from a bulb to the power supply. Turning the resistor handle, read out indications of tension from the reference voltmeter and being guided by them, you apply a marking on a scale of the marked device with a step to 1 Volt. If the checked device is calculated on bigger tension, use the power supply, the reference voltmeter and a bulb on respectively bigger tension.
3. Use for graduation of the measuring device for food of chains of variable and constant currents of UI300.1 type will give high precision of a marking of the checked voltmeter. Connect the voltmeter to this device and having used indications of the maintenance instruction on UI300.1, its otgraduiruyta.