Clamp multimeter use method - Database & Sql Blog Articles
The measuring current portion of the clamp multimeter is composed of a current transformer and a current measuring part of the multimeter. The core of the transformer has a movable part and is connected to the handle. When in use, the handle is pushed to open the movable iron core. Place the wire of the current to be measured into the jaws and loosen the handle to close the core. At this time, the wire passing through the current is equivalent to the primary winding of the transformer, and the secondary winding will have an induced current, the size of which is determined by the operating current of the wire and the number of winding turns. The ammeter is connected across the secondary winding so that the current it indicates is the current in the secondary winding, which is proportional to the current in operation. Therefore, the scale that is normalized is used to reflect the amount of current on the primary side. When a current flows through the wire, the current meter pointer connected to the secondary winding is deflected proportionally to indicate the value of the current to be measured.
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When in use, turn the range switch to the appropriate current position. Hold the watch body and press the switch with your thumb to open the jaws and introduce the wire under test into the center of the core. Then, when the switch is released, the iron core is automatically closed, and the current of the wire to be tested generates an alternating magnetic field line in the iron core, and the current value is reflected on the meter, which can be directly read.
1. Read the instruction manual carefully before using the digital multimeter to familiarize yourself with the power switch function and the limit switch, input jack, socket, and various function keys, knobs, and accessories. In addition, you should also understand the limit parameters of the multimeter, the characteristics of overload display, polarity display, low voltage display and other indicator display and alarm, and grasp the change rule of the decimal point position. Before the measurement, the test pen should be carefully checked for cracks, the insulation of the lead wire is damaged, and the position of the test pen is inserted to ensure the safety of the operator.
2. Before each measurement, check whether the measurement item and the limit switch are dialed, and whether the input jack (or dedicated jack) is selected.
3. When the meter is just measuring, the meter will show the number of hops. Wait for the displayed value to stabilize before reading.
4. Although the digital multimeter has a relatively complete protection circuit inside, it is still necessary to avoid operational malfunctions, such as using a current block to measure the voltage, using an electrical block to measure the voltage or current, and using a capacitive block to measure the charged Capacitors, etc., to avoid damage to the meter.
5. If only the highest digit displays the number "1", the other bits are blanked to prove that the meter has been overloaded, and a higher limit should be selected.
6. It is forbidden to toggle the limit switch when measuring voltage above 10OV or current above 0.5A to avoid arcing and burn the contacts of the transfer switch.
7. Mark the number of the hazard symbol next to the input jack, which represents the limit value of the input voltage or current. Once it is exceeded, it may damage the instrument and even endanger the safety of the operator.
8. The clamp-type multimeter must not measure the current of the high-voltage line. The voltage of the tested line should not exceed the voltage level specified by the clamp meter (generally but over 500 volts) to prevent insulation breakdown and personal electric shock.
9. The measurement should estimate the magnitude of the measured current, select the appropriate range, and do not use the small range gear to measure the large current. 10. Before the measurement, pay attention to turn the range switch to the corresponding AC current position. Do not use the voltage file and resistor. File to measure the current, remember! Do not use the resistance gear and current file to measure the voltage, otherwise, if you are not careful, it will burn the meter.
11. Only one wire can be clamped per measurement. The measurement should be placed in the center of the jaws to improve the accuracy of the measurement. It is best to flatten the body with your hand to prevent the wires from leaning against the jaws and the body.
12. After the measurement is completed, the range switch must be turned to the maximum voltage range position, and then the power switch is turned off. To ensure the next safe use.
