Introduction: Avometer is a kind of very practical testing instrument, it still is called answer with watch, multi-purpose watch, 3 with watch, numerous wait with the watch, it is the measurement with the indispensable branch such as electric power electron equipment, basically use at measuring voltage, electric current and resistor to wait. So can you use avometer? Let us learn together! The use of avometer (1) the meaning of each symbol on familiar dial and the main effect of each knob and select switch. (2) undertake mechanical zero. (3) the sort that the basis is measured and size, choose transfer switch block reach span, find out corresponding graduation mark. (4) the place that chooses to express a pen to insert aperture. (5) measure voltage: Measure voltage (or electric current) when should choose good span, if use small span to measure big voltage, can have the risk that burns a watch; If use big span to measure little tension, so deflexion of pressing with a finger is too small, cannot reading. The choice of span should make deflexion of pressing with a finger is controlled to the 2/3 of full scale as far as possible. If not be clear about beforehand,be measured when the size of voltage, answer to choose highest span to block first, reduce appropriate span gradually next. A, the measurement of alternating voltage: Make the park of a transfer switch of avometer, volts d.c. is blocked, on the appropriate span of alternating voltage of park of another transfer switch, avometer two watches pen and paralell connection of the circuit that be measured or load can. B, the measurement of volts d.c. : Make the park of a transfer switch of avometer, volts d.c. is blocked, on the appropriate span of volts d.c. of park of another transfer switch, and " + " watch pen (red watch pen) receive high potential part, "- " watch pen (black list pen) receive low potential part, let electric current namely from " + " watch pen is flowed into, from " - " watch pen is poured out of. If express a pen to receive,turn over, the finger that express a head can turn over directional deflexion, strike crooked finger easily. (6) measure electric current: When measuring dc electric current, the dc of park of a transfer switch of avometer electric current is blocked, 50uA of park of another transfer switch arrives on the appropriate span of 500mA, span choice of electric current and reading method and voltage are same. When measuring must first open circuit, next according to electric current from " + " arrive " - " direction, avometer series connection arrives to be measured in circuit, namely electric current is flowed into from red watch pen, from black list the pen is poured out of. If by accident avometer and laden paralell connection, criterion the internal resistance because of expressing a head is very little, can create appearance of short circuit burn down. Its reading method is as follows: Span of indicated value × of real value = / slant completely (7) measure resistance: When measuring resistance with avometer, answer to operate by following method: A, mechanical zero. Before use, should adjust first screw of fixed position of pressing with a finger makes electric current shows number for 0, avoid needless error. B, choose appropriate fold to block. The graduation mark that avometer ohm blocks is inhomogenous, the choice that so fold blocks should make pressing with a finger stays in graduation mark rarer part is advisable, and pressing with a finger is close to scale feet more among, reading is more accurate. Usually, should make pressing with a finger points to the 1/3~2/3 in scale feet. C, ohmic zero. Before measuring resistance, answer to express 2 pen weak point to receive, adjust at the same time " ohmic (electric) zero knob " , make pressing with a finger just points to the null in right of ohmic graduation mark. If pressing with a finger cannot move null, explain batteries voltage is not worth or appearance interior has a problem. And every change fold block, want to undertake ohmic zero again, measure in order to assure accurate. D, reading: The reading that expresses a head is multiplied with fold, what measure the resistance of resistor namely. Avometer uses skill 1. Judgement circuitry or the alternating voltage that parts of an apparatus takes avometer of not electrified number are blocked very acute, even if all round can have very little induction tension show. According to this one characteristic, can regard as test electrography is used. Usage is as follows: Hit avometer AC20V to block, black list pen is impending, hold red watch pen and place side course or parts of an apparatus to connect touch, at this moment avometer can have show, if show the number arrives in a few bend over between ten bend over (different avometer can have show differently) , show this circuitry or parts of an apparatus are electrified, if show,be 0 or very small, show this circuitry or parts of an apparatus are not electrified. 2. Line of divisional power supply is live wire still be 0 lines the first kind of method: Can try to judge with the method above: Indication number is larger is live wire, indication number is lesser is 0 lines. Need of this kind of method and measure circuitry or parts of an apparatus are contacted. The 2nd kind of method: Do not need the circuitry that measures with place or contact of parts of an apparatus. Hit avometer AC2V to block, black list pen is impending, hold red watch pen to make road of nib along the line slides gently, express at this moment if show,go up for a few bend over, demonstrating this line is live wire. If show zero hot season is only younger even. Explain this line is 0 lines. Such judgement method is not contacted directly with circuit. Not only safe and convenient quick. 3. The breakpoint that searchs cable should appear in cable when breakpoint, traditional method is to use avometer resistor to block a paragraph of breakpoint that a paragraph of ground searchs cable, such doing waste time not only, and can damage greatly the insulation of cable. The inductive character that uses digital avometer can search those who find cable to disconnect immediately dot. Holding back judgement to go out with report first is which cable core line happening opens circuit. On the receives AC220V directly power source of the core line that will produce open circuit next, hit avometer AC2V to block subsequently locally, black list pen is impending, hold red watch pen to make road of nib along the line slides gently, be like on the watch at this moment show have a few hot season or zero bend over (because of cable different and different) voltage, if move,the indication to the watch when some position is reduced suddenly a lot of, note next this one position: Usually. Breakpoint is in the place between the ahead 10~20cm of this one position. The open circuit that still can search the resistor silk such as blanket of breakdown electric heat with this kind of method is nodded. 4. The frequency that measures UPS power source to UPS power source. The stability of the voltage that its output end is important parameter, the frequency that its output is very important also. But cannot block with the frequency of digital avometer directly go measuring, because of its frequency is blocked can susceptive voltage is very low. Have a few hot season only. Can be in at this moment the output termination of UPS power source 6V of one 220V ／ or step-down transformer of 220V ／ 4V, reduce tension, and the frequency that does not change power source, block frequency the output with transformer to connect next, can measure the frequency that gives UPS power supply. Avometer uses a note (before 1) is 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. (2) is in use 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. (When 3) is 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. (When 4) avometer is being used, must the level is placed, lest cause an error. In the meantime, notice even avoid the effect of outside magnetic field to avometer. (5) avometer is used end, should alternating voltage of transfer switch park the biggest block. If be not used for a long time, still answer to take the battery of avometer interior, lest batteries corrodes parts of an apparatus of the other inside the watch. CNC MillingCNC Machining