s the digital multimeter (DMM) to measure the resistance of one of the resistors

Question

s the digital multimeter (DMM) to measure the resistance of one of the resistors. Experiment with the on the instrument, and record the reading for each range setting Pay particular attention to the nuinber of significant digits displayed for each range. Record all your readings in the space below. Repeat using the analog multimeter (Simpson meter), Note Tun the meter to +DC Volts to measure resistance. First, connect the clips to each other (short circuit), and zero the meter. Then connect the clips to the resistor to measure resistance. Again, play with the range settings and record your readings inthe space below. NOTE you must re-serthe meter every mneyou chonge the runge setting, 3. 4. Tun the Simpson meter off when you are done- we do not want to drain the battery Use the DMM to measure the capacitance of the provided capacitor. Again experiment with the range setting on the instrument, and record cach reading in the space below Use the DMM to measure the voltage of the DC power supply. Adjust the DC voltage to about 10 V. Again experiment with the range setting on the instrument, and record each reading S. 6. If your power supply has a voltage display, record it here. Power supply voltage Does the DMM measurement agree with the power supply display? Yes No Our power supply does not have a voltage display Connect the function generator to the analog ascillescope. Make sure the channel is set to DC, not AC or ground. Vary the frequency of the output wave, the DC offiet, and the amplitude. Note: On some function generatons, the DC offset knob must he pulled out or pushed in to become effective 1. 2. Watch the waveforms on the escilloscope as the frequency, amplitude, and DC offiset of the function generator are adjosted. Tum the various knobs on the oscilloscope to become familiar with the time scale, trigger, and voltage scale adjustments on the oscilloscope. Switch between sine wave, rectangular wave, and triangular wave the oscilloscope should correctly display the generated waveform. When inished "play ing" with the knobs, make sure the VAR Sweep dial and the red VAR knob extension on the Volt Div knob are hoth turned all the way clockwise, otherwise, incorrect readings will result. 3. Set up a standard case with the function generator-a sine wave of 100 Hz, with peak-to-peak voltage ahout 6 V, and with nearly zero DC offhet. Recond the frequency displayed by the function generator Displayed frequency Hz 4. Measure the period of the wave from the oscilloscope display (by counting divisions on the screen, and take the loverse to calculate the firequency of the signal in Hz). Show your calculations below. The frequency ssul agrec sonably well with that displayod hy the function generator, if not seek help Measured period Calculated frequency Hz

Explanation / Answer

1) First let us take a standard valued resistance of 1K for illustration purpose.

Two probes are connected to two of the ports in multimeter on the front. Com stands for common and it always connected to the ground of the circuit. The other two ports may be 10A port and mAV port. The 10A port is used to calculate the large currents and the mAV port is used to calculate the currents in the range of milli amperes, voltages and resistance in ohms.

Put the one side of black probe and red probe into com and mAV ports respectively and the other sides of the probes onto the resistor terminals.

The displayed values for different scales are

Scale()                   value

20K                                 0.97

200K                              00.9

2M                                 0(means to lower the value)

2K .981

200 1 or OL

Remember many resistors have 5% tolerance. For 1K ohm resistors the values may be varied from 0.95K to 1.05K.

2) The first step in using the analog ohm meter is to zero the meter.

This is accomplished by touching/holding the tips of the red and black meter leads together. Then you use the zero ohm adjust knob to adjust the needle if needed to read zero ohms.

In the analog multimeter , the ohm meter readings and current reading are overlapped. The ohm readings are given as X1, X10, X1K, X10K .

For the 1.5 valued resistor the readings are

Scale()                      meter indication               actual measurement(meter indication X scale)

X1                                   1.5                                                         1.5

X10                                 15                                                           150

X1K 150                                                         150K

X10K                              15                                                           150K

4) The capacitance can be calculated by connecting the probes to µAmA and V ports on the multimeter. The capacitance scale will be 2n,20n,2µ and 100µ etc.

Then discharge the capacitor by touching/holding the two terminal together. Connect the two terminals to the two probes.

For 1µF capacitor the meter readings will be

Scale                                      meter display

2n                                           1 or OL

20n                                         1 or OL

2µ                                           1.045µF

100µ 1µF

5) Put the black probe into com probe and the red probe into the mAV or V port depending on the type of multimeter. Connect the black probe to the power supply negative terminal or ground and red probe to the positive supply (10V).

Put the DC voltage range in the multimeter range selection.

Scale                                      meter display

200mV 1 or OL

2V                                           1 or OL

20V 10.00

200V 10.0

600V 10

Related Questions

Navigate

• Browse (All)
• Browse S
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.