4.3.2 Experimental instruments
Oscilloscope;low-frequency signal generator.
1)YB4324 dual trace oscilloscope
The panel of the YB4324 dual trace oscilloscope is shown in Figure 4.3.1 and the name and functions of its knobs are as follows.
(1)Input Channels:
CH1(X)and CH2(Y):Two input channels for tested signals.
External input channel(EXT INPUT):The input channel for the external trigger signal as long as external trigger is selected.
Figure 4.3.1 Panel diagram of YB4324 dual trace oscilloscope
(2)Vertical channel area(divided into CH1 and CH2 channels):
Coupling mode(AC-GND-DC):The coupling mode selection switch for the measured signal input to the vertical channel.
Press“GND”to ground the input terminal to determine the position of the light trace where the input terminal is at zero potential,and to add a signal at raises;“DC”coupling is suitable for observing signals containing DC components;“AC”coupling is suitable for observing the AC component of the signal.
VOLTS/DIV:Vertical deflection sensitivity dial switch(V/div)and fine-tuning knob.
When the fine-tuning knob is turned fully clockwise(to the correction position),the nominal value of the position where the dial switch locates is the vertical deflection sensitivity which is used to measure the amplitude parameter.
“CH1”displays the waveform from CH1 channel.“CH2”displays the waveform from CH2 channel.If“CH1”and“CH2”are pressed at the same time,it displays the signal of both waveforms.If simultaneously lifting these two buttons,it displays the superimposed waveforms.“Alternate(ALT)”is suitable for observing high frequency double trace waveforms.“Intermittent”(CHOP)is suitable for observing low frequency double trace waveforms.When“CH2 inversion”is pressed,the signal of CH2 is inverted,and the signal is normal at raises.
For earlier models,the single-track display corresponds to pressing“CH1”or“CH2”and the double-track display corresponds to pressing“ALT”or“CHOP”.
×5 Multification:vertical deflection sensitivity expansion switch.
Press this key,the measured waveform expands 5 times in Y-axis direction.
POSITION:Adjusting knob for vertical displacement of light trace.
2)YB1638 function wave generator
The panel of the YB1638 function wave generator is shown in Figure 4.3.2.The name of each knob on the function generator panel:
Figure 4.3.2 YB1638 function wave generator(https://www.daowen.com)
①POWER:Power supply switch.
②FREQUENCY:Frequency adjustment knob.
③LED display:display the frequency of the output signal.
④DUTY:duty cycle control switch.
⑤DUTY:duty cycle selection switch.
⑥SYM:Symmetry ratio adjustment knobs.
⑦I NVFRT:Wave phase inversion switch.
⑧Frequency range selection switch.
⑨WAVEFORM:Waveform mode selection switch.
⑩ATTENUATOR:Voltage output attenuation switch.
○1 PWR,OUT:power output switch.
○12 Power output terminal.
○13 LEVEL:Level control switch.
○14 LEVEL:Level adjustment knob.
○15 AMPLITUDE:waveform amplitude adjustment.
○16 VOLTAGE,OUT:Voltage output plug.
○17 TTL,OUT:TTL square wave output plug.
○18 VUF:External voltage input.
○19 EXT,COUNTER:External test frequency input.
○20 COUNTER:Internal and external switch for frequency measurement.
YB1638 model function wave generator,the frequency range is:0.3 Hz～3 MHz,and the lowest frequency can reach 0.06 Hz.The output waveforms include square wave,triangle wave,sine wave,ramp wave,pulse wave,TTL square wave and DC level.Symmetry adjustment has little effect on signal frequency.Duty cycle adjustment and inverting switch can change square wave pulse width and ramp slope.Six-digit LED frequency display can be used as a 10 MHz frequency counter to measure the frequency of external signals.The instrument is equipped with voltage output and frequency output ports.Its voltage output falls within 20 Vp-p(no load)and 10 Vp-p(50 Ω)while frequency output range falls within 0.3 Hz～30 kHz.And it equips overload short circuit protection and instructions.
