At first view rises avometer is very complex, actually it is by ammeter (common says to express a head) , the composition such as pen of select switch of dial, span, watch, if pursue,1 is shown. When using when if point to span select switch,dc sheds limits, ammeter M receives resistor of a few billabong to realize enlarge the purpose of a large number of Cheng (Rg is) of the resistor that express a head, make it becomes to have a few volume the ammeter of different span. Measure a result to want to see scale of electric current of the dc on dial come reading. Normally scale of electric current of the 2nd behavior, if pursue,2 are shown. Same, if span select switch points to volts d.c. limits when, watch head is strung together receive additionally a few resistor (like R2, R3, divide the principle that press with series connection resistor, the volmeter that makes it becomes a many Cheng to measure sees a picture 3. Reading should see scale of the volts d.c. on dial. Most avometer voltage and electric current are operable one scale. If a commutator is received in the circuit that measures volts d.c. , can measure alternating voltage. The principle that measures resistance and measure volts d.c. similar, a group of cell still must be increased when just checking. When select switch points to resistor limits, the first resistor searchs on dial special scale reading can.

The model of avometer is very much, but it is identical that its use a method basically. It is with MF30 avometer now exemple, introduce its use method.

The note that avometer uses:
(Before 1) uses avometer, must be familiar with the action of span select switch. What should measure clearly? How to go measuring? Dial span select switch the place that checks file in need next. Must not get archives wrong. For example: When measuring voltage, dial select switch by accident when electric current or resistor archives, burn out watch head easily.

(2) before using avometer, should undertake first " mechanical zero " , was not being measured namely when n, make avometer finger points to in 0 voltage or of 0 electric current locally.

(3) in using avometer process, cannot contact the metallic part that expresses a pen with the hand, what can assure to measure on one hand so is accurate, also can make sure person is safe on the other hand.

(4) when measuring some n, cannot measuring while shift gear, when measuring tall voltage or big electric current especially, should notice more. Otherwise, can make avometer is destroyed. If need shift gears, should disconnect first watch pen, shift gears hind is measured again.
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