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Lecture_4 - (large range mA – pA A What does that mean...

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1 DMM, oscilloscope, function generator CHM6158C - Lecture 4 Jan 18 • diagnostic instrumentation (DMM, ammeter, oscilloscope), merits and advantages • delay generator (exact timing, triggers) • function generators (generate time-varying functions) • “troubleshooting” = diagnostic tools
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2 Digital multimeter Note maximum voltages (400 VDC) and currents (mA) that can be measured. If need to measure larger voltages need high-voltage probe. Highly versatile (voltmeter, ammeter, ohmmeter) + - Slow-changing voltages (update rate is sec), low sensitivity for currents (mA)
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3 Principles of measurements Variable resistor • Very low internal resistance (do not increase overall resistance of circuit) • In series with circuit (all current flows through ammeter) • High internal resistance • In parallel with circuit Why?
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4 Ammeter If can go down to picoAmps, also often referred to as picoammeters
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Unformatted text preview: (large range: mA – pA) A What does that mean? * Not covered in these labs Ground-referenced picoammeter 5 Oscilloscope • Very fast update (down to ns) ⇒ time-dependent information • Multiple channels (2 or 4) • Display on screen and can export to computer Probes to measure higher voltages (normally 10x divider) CAUTION: DO NOT EXCEED maximum input voltage Expensive >$5k + • Many parameters (triggering, voltage and time division) to adjust-6 Delay generator * Not covered in these labs Generate ttl (transistor-transistor logic) pulses to drive other pieces of equipment) e.g. trigger oscilloscope A B C D T0 7 Function generator Also known as arbitrary waveform generators Oscilloscope reading of sine wave square wave triangular wave 8 More complicated waveforms e.g. frequency sweeps Arbitrary waveforms are also possible (i.e., no function)...
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