26
Circuit 2:
Extending the measuring range
Setup information
Install the resistor and then the jumper as shown in
Fig. 2.2.
Connect the moving-coil instrument. Check the
placement on the board again and only then connect the battery.
Components required:
1 x 10 k
Ω
resistor,
1 x moving-coil instrument,
1 x breadboard, 1 x 9V bat-
tery with clip connector
Fig. 2.2:
Extending the measur-
ing range
Experiment
Once the battery is connected, the moving-coil instrument will deflect. What is the scale of the deflection? If
everything is working properly; the needle will move and stop roughly in the middle of the scale. Again, this
is a voltage measurement.
The resistor uses more or less half of the battery voltage. Circuit 1 has two resistors in parallel. Thus, the
current flow was twice as much using only half as much voltage.
You could use a greater resistor connected in series with the moving-coil instrument, for example, to
increase the voltage measurement range.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.2.
Summary of Contents for ELECTRONICS EXPERIMENTS BOX
Page 4: ......
Page 265: ...267 Fig 3 56 Cir cuit 56 Audio limiter Fig 3 57 Circuit 57 Amplifier for a storm detector...
Page 269: ...271 Fig 3 64 Circuit 64 Stabilizer for 1 9 V Fig 3 65 Circuit 65 Stabilizer for 2 5 V...
Page 275: ...277 Fig 3 80 Circuit 80 Quiztimer 30 seconds Fig 3 81 Circuit 81 Handy diode tester...
Page 315: ...317 Fig 3 179 Circuit 179 HF generator 150 kHz Fig 3 180 Circuit 180 HF generator 420 kHz...
