The electron measures the introduction of the instrument, classification and operation way

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(2) , cannot measure high-power. Normally upper limit is + 20dBm, floor level is - 60dBm left and right sides. (3) , the average power that can measure all sorts of modulation signal, peak value power, sudden power. Through type powermeter, it is to use device of some kind of coupling, wait to give one part power by certain scale coupling from inside transmission power like directional coupler, coupling loop, bougie, send powermeter magnanimity, transmission general power is equal to powermeter indicated value to multiply with coefficient of proportionality. The pioneer inside the course of study of through type powermeter is Bird, the old person of radio frequency microwave should know. The main characteristic; of through type powermeter (1) through type powermeter has high-power to measure ability. Theoretic for, want the power that transmission line can carry only, through type powermeter can be measured. The power of kilowatt goes up at every turn on wide report so, be measured by through type powermeter. (2) through type powermeter accomplishs a broadband very hard, this is the limitation as a result of the directional coupler inside. (3) exist as a result of the coupling factor of directional coupler, through type powermeter cannot be used at too little power to measure. This is mixed each has his strong point of as it happens of terminal type powermeter. 2, mix according to sensitivity measure limits to classify radio frequency or microwave powermeter to be mixed by sensitivity measure limits classification, can divide heat up powermeter of type powermeter, crystal detecting type to measure thermal resistance powermeter, thermocouple powermeter, volume. Measure thermal resistance powermeter to use heat to change resistor acting rate infects feeling cell. Heat changes the temperature coefficient of resistance is bigger. The power of the signal that be measured is changed by heat quantity of heat of the generation after resistor is absorbed, make its oneself temperature elevatory, resistance happening changes significantly, use resistor bridge to measure the change of resistance, indication power is worth. The heat in thermocouple powermeter thermocouple powermeter writtens guarantee occasionally draw power of high frequency signal directly, node temperature is elevatory, generation electrometric temperature difference, the volume direct ratio of electromotive force is worth at absorption high frequency power. The measurement of this kind of powermeter precision is taller, use at comparing accurate power to measure commonly. The quantity heats up the fuel factor powermeter of type powermeter model, use adiabatic load to draw power of high frequency signal, make laden temperature elevatory, recycle thermocouple component measures laden temperature change volume, calculate high frequency power to be worth according to the calorimeter of generation. This basically sees not more inside our lab, multi-purpose the power at calibration class is fiducial test. Radiodetector of diode of crystal of powermeter of crystal detecting type is commutation of high frequency signal low frequency or dc signal. Choose the job to nod appropriately, the extent direct ratio that makes radiodetector outputs signal the power at high frequency signal. Because powermeter of transistor detecting type measures speed the characteristic such as moderate of fast, precision, it is all the time in the measurement of radio frequency microwave wide to use. 3, classify by the signal that be measured according to the different classification radio frequency of the signal that be measured or microwave powermeter: Successive wave powermeter and powermeter of pulse peak value. Powermeter technology index is the typical technology index of radio frequency powermeter below: 1, power limits assures those who measure precision to be able to measure power maximum and scope of the least value. The power limits of powermeter decides at power probe. 2, the biggest allow power probe value of not damaged the biggest power input, point to average power normally. When measuring signal of high-power peak value, notice peak value voltage cannot exceed fair value, cause voltage breakdown otherwise. Use power times to cannot be measured absolutely be more than the signal that allows power value, can cause power probe burn down otherwise. 3, the frequency limits of the signal be measuringed that frequency limits can assure to measure precision and function index. 4, the precision after measuring precision to show power probe calibration is amended. Do not include those who test a system to break compound an error. 5, the stability of stability powermeter depends on of the stability of power probe and indicator 0 float reach noise interference. 6, the time that answers time to also say power infects feeling cell is invariable. 64% when show power indicator rises to stable value normally needed time. 7, when the model of probe, impedance chooses powermeter probe, limits of the use frequency of power probe, power must agree with the signal that be measured, the structure of probe transmission line and impedance should match each other with the transmission line that be measured. The operation way that the electron measures an instrument one, the security that handles personnel 1, danger getting an electric shock----The importance of ground connection 2, environmental element (explode combustibly, easily) think 3, the examination after carrying 4, potential other risk 5, the measure that ensures person safety 1, rigid regulations system 2, the operation measure of the standard 3, rigorous operation is normative 4, , the instrument does not want excessive pile: Especially weight is greater. Can cause an instrument otherwise exterior be out of shape, decline the accident circumstance such as attaint. Use special apparatus to wear when necessary. Special appearance is changeful when encountering collision, extruding form attaint, need special attention. (2) , put the position to cannot affect an instrument to come loose heat comes loose when heat ensures the instrument works good it is the main demand that the instrument works for a long time normally. General attention is the following at 2 o'clock: All round A, instrument with other object, for example other instrument / metope, assure the distance of 10cm above. Have the side that installs fan especially, ensure airiness. B, want those who notice an instrument to come loose hot passageway is not formed string stream (give wind gap to air inlet) , otherwise downstream machine is met because of overheat cannot work to cause trouble even normally. (2) , power supply is safe (it is 1) , OK to affirm an instrument use 220V alternating current source has some of instrument, import an instrument especially, electrical outlet of power source input can have the many grade such as 100V~120V and 220V~240V. Should affirm first before use instrument whether be 220V archives on. If archives dial a fault to become 110V, burn insurance gently, weigh a power source of burn down instrument module of other even function. A, all instrument and wait for measure content must reliable ground connection. B, major instrument has special earthing terminal. Ground wire must be received go up in earthing terminal. Instrument of C, part does not have special earthing terminal, ground wire must be received go up in housing, originally closely with screw. Cannot circle in the fluky place such as fan guard. If instrument not ground connection or ground line contact are undesirable, can cause equipment port electrified. The circuit of spark attaint interior that is linked together possibly in port and other equipment, this is mixed to electronic instrument wait for measuring a target is deadly. Even discharges to human body, cause person safety accident. Instrument ground connection, it is to pass the ground connection end of electrical outlet of outlet of 3 core power source and ground to be linked together at present. But the power source electrical outlet that uses actually off quality or contact are undesirable, do not have a law to assure ground connection, the requirement is so all instrument equipment must additional ground wire, be linked together with earth mat (2 ground connection, strengthen ground connection) . Special remind: The instrument is moved between different use spot when moving, want special attention, the ability after receiving ground wire is used. Input of high-power instrument AC uses air switch please. (3) , carriage safety (A of move of 1) , close quarters, attention takes put down gently gently, avoid to shake, knock against. B, when adjusting front or shift, should raise an instrument, do not want direct push-pull, avoid to cause irregular spring because of attrition and cause in-house machinery damage. C, the instrument should be used when carrying an instrument special vehicle, avoid to shake. (A of 2) , line-haul, best use former plant to carry the box that pack and in-house fill data. When pile of instrument of B, much platform is carried, want a code to put tight, close together, smooth. C, when using its to pack box to carry, the fluctuation that should notice an instrument, left and right sides and around all put apart the space of 10 centimeter above, use bubble board or rigid sponge to wait for fill of packet of feed a machine, make sure the instrument is firm, entire case is close-grained without become loose feeling; D, when necessary of custom-built liner hard sponge ligneous and special carriage box. (4) , the safety that store (A of 1) , short-term memory, OK save in the lab, but must notice to have clear label, and place in get not easily the other influence, position that also won't affect other to work, prevent needless shift. B, deposit an environment to want dry, ventilated, satisfy basic storage requirement. (The instrument that seals up for keeping 2) , for a long time A, long-term should deposit appropriative to store space (instrument storehouse) , each establishment accords with storehouse the requirement of safety of national concerned storage and environment. The instrument that seals up for keeping B, for a long time should add report to switch on the mobile phone regularly examination, some instruments still need to undertake other and relevant maintaining. The safety of C, operation. (1) , above all, understand an instrument. Before use instrument, should read use manual carefully or coach by relevant personnel, groom, with understanding its standard of main function, operation reachs use note. This is the premise of safe operation. (It is 2) , good to do electrostatic defend the job endangers electrostaticly: Human body was not being done effective antistatic below the circumstance of measure, 1000V often is taken to arrive on the body and dress of 5000V electrostatic. Want to make access only, those who accumulate is electrostatic can release. Because much energy is released inside cutty time, often bring about circuit element to damage. Electronic instrument (especially the circuit of large scale integration in the instrument) right electrostatic and special sensitive, a lot of high speed exceed dimensions integrated circuit to come up against only of a few bend over or lower electrostatic can be damaged. Installation is in printed circuit board because the parts of an apparatus that go up is electrostatic the dangerous sex that causes damage is bigger, because each presswork,line or lead are join access of a few component, to this line discharge establishs the parts of an apparatus that can affect a few above. Be based on above reason, electronic test instrument must adopt severe electrostatic preventive measure (output port to the input of the instrument especially) . 5, avoid heat to insert unplug the electron is measured do not support heat to insert commonly unplug, inserting unplug want to shut the instrument the reentry after cutting off the power to go first before fittings. Additional, need special attention the instrument switchs on the mobile phone ordinal: Insert first on AC power supply cord - > open instrument switch again; Involve engine order: Shut instrument switch first - > unplug again power supply cord issueing AC. 6, special: Certain instrument has bare wiring terminal, ask appropriate to undertake Fu is protected wrapping, get an electric shock in order to prevent or contact short circuit. CNC Milling CNC Machining