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H? `x0?9o@6p6@@0o@@ 6߇kZ`  x@6hZ ?kڿ@%@? ?????`0?????`0?????<T?8??????&?)?}/?Hy??`pom?H$dojp <R zH| >ojH$<No}?pd GINF -} iGINF[Z BlackGINFZ BlackGINF SHD1PW2W2W2vPTMainTBDYRULERATTR dCHRSElectronic Servicing yr.1 pt.1ATTR dCHRS ATTR hdCHRS ATTR hdCHRS ATTR dCHRSLecture: 014.P ATTR hdCHRS ATTR hdCHRS ATTR hdCHRS ATTR hdCHRSMonday - 25th - November -ATTR hdCHRS1996RULEATTR hdCHRSRULEATTR hxCHRSSignal GeneratorRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEzATTRz hdCHRSzThis is a device which generates sine or square waves, at a certain selected frequency. The type of waveform is selected by a slide switch which could be set on a sine waveform, or a square waveform. The DIAL of the signal generator is used to set the frequency in the range of the scale. Hence between 10 to 100 Hz. As one can see the scale is a non linear (logarithmic) scale.RULEATTR hdCHRSRULEXATTR hdCHRS 10 - 20 Hz :ATTR 9dCHRS ATTR hdCHRS10 divisions of 1 Hertz eachATTR YdCHRS ATTR hdCHRS ATTR hdCHRS4ATTR hdCHRS 0 - 50 Hz :ATTR dCHRS ATTR dCHRS4ATTR dCHRS divisions of 2.5 Hertz eachRULEVATTR hdCHRS 20 - 30 Hz :ATTR 9dCHRS ATTR dCHRS5 divisions of 2 Hertz eachATTR hdCHRS ATTR wdCHRS ATTR hdCHRS ATTR hdCHRS 50 - 60 Hz :ATTR dCHRS ATTR dCHRS2 divisions of 5 Hertz eachRULE[ATTR dCHRS 30 - 40 Hz :ATTR 9dCHRS ATTR 9dCHRS5 divisions of 2 Hertz eachATTR dCHRS ATTR hdCHRS ATTR. hdCHRS.60-70, 70-80, 80-90, 90-100Hz : same as aboveRULEATTR dCHRSRULEATTR dCHRSRULEATTR dCHRSThe pointer is fitted to a knob to which is attached a slow motion drive with a reduction ratio of 2.5 to 0.5 turn, i.e. 5 : 1 turns. This knob sets the frequency fine adjustmentRULEATTR dCHRSRULEATTR dCHRSRULE4ATTR4 dCHRS4The frequency rough (coarse) adjustment is set by the rotary switch called frequency range. The ranges are x1 (as in the dial scale), x10, x100, x1000 (1k), x10,000 (10k). The frequency scale of the signal generator is multiplied by the above magnitude to give the frequency which the generator id emitting.RULEATTR dCHRSRULEATTR dCHRSRULEbATTRb dCHRSbEg: Fine freq. set at 50, Rough freq. set at x10, frequency of wave is thus 50 x 10 = 500HertzRULE`ATTR` hdCHRS` Fine freq set at 100, Rough freq set at x10k, frequency of wave is 100 x 10 x 1000(kilo)RULE(ATTR hdCHRS ATTR hdCHRS ATTR hdCHRS ATTR hdCHRS ATTR hdCHRS ATTR hdCHRS ATTR hdCHRS ATTR hdCHRS ATTR hdCHRS ATTR hdCHRS ATTR hdCHRS ATTR hdCHRS= ATTR hdCHRS1,000,000 = 1 MHertzRULEATTR hdCHRSRULEQATTRQ hdCHRSQThe complete range of frequence that the generator produces is from 10Hz to 1MHz.RULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEiATTRi hdCHRSiA wave is a 2 dimensional graph. The horizontal axis of the wave is the periodic time from which the frequency can be found. The vertical axis represents the amplitude or peak of the wave. The peak of the positive to the peak of the negative part of the wave is called as peak to peak. One cycle or wave is 1 complete sequence of events, thus A, B, C, D and E.RULEATTR hdCHRSRULEATTR hdCHRSThe periodic TIME is the time taken for one complete cycle. This can be easily converted to frequency, which is the numbers of cycles per one second, by taking the reciprocal of the time.RULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULETATTR hdCHRSTime = 1ATTR  dCHRS ATTR dCHRS = seconds (s)ATTR jdCHRS ATTR hdCHRS ATTR hdCHRS ATTR( hdCHRS(Frequency = 1 = Hertz (Hz)RULE1ATTR hdCHRS frequencyATTR dCHRS ATTR hdCHRS ATTR hdCHRS ATTR hdCHRS ATTR IdCHRS ATTR hdCHRS ATTR hdCHRS ATTR IdCHRS ATTR hdCHRS timeRULEATTR hdCHRSRULE;BATTR hdCHRS Example 1:ATTR dCHRS ATTR0 dCHRS0Find the periodic time whose frequency is 50 Hz.RULE,ATTR hdCHRS ATTR hdCHRS RULE;nATTR hdCHRS ATTR hdCHRS ATTR hdCHRStime = 1 / frequencyATTR ;dCHRS ATTR$ mdCHRS$= 1 / 50 = 0.02 seconds = 20 msRULEATTR mdCHRSRULEWBATTR mdCHRS Example 2:ATTR dCHRS ATTRL dCHRSLWhat is the frequency of a wave whose one cycle takes a periodic time of 2msRULE^BATTR hdCHRS ATTR hdCHRS ATTR\ hdCHRS\time = 1 / frequency, frequency = 1 / time = 1 / 2ms = 1 / 0.002s = 500Hertz. RULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRULEATTR hdCHRSRMSTRULEATTR dCHRSLMSTRULEATTR dCHRS