Refresher Course: Experimental Physics
Refresher Course: Experimental Physics
Refresher Course: Experimental Physics
IN
Experimental physics
INDAIN ACADEMY OF SCIENCE
ExpEYES
is a product from the PHOENIX project (Physics with Home made Equipment & Innovative Experiments), started in 2004 under the leadership of Dr. B.P. Ajith Kumar by IUAC
Inter University Accelerator Centre (An Autonomous Research Facility of UGC)
http://expeyes.in
ExpEYES supports a wide range of experiments suitable for higher secondary, B.Sc and the first year electrical and electronics engineering degree courses.
EXPEYES
Hardware Features
Micro-controller based design
Analog Input /Output with 12 bit resolution Digital Input / Output Oscilloscope Frequency Counters Waveform Generators Programmable Current Source 3 Inv. Amplifiers and one Non-Inv. Amplifier Digitizing sound using microphone
Accessories
Architecture of ExpEYES
3 4 23
Software can read the logic voltage level applied to them. Any voltage less than 0.8volts is treated as 0(LOW) anda nything higher than 2volts is treated as1(HIGH). Digital Output Voltage at these terminals 0 or 5 volts. OD0 and OD0 is transistor buffered and can drive up to 100mA current. OD1 OD1 can only drive up to 5mA. Sensor Input(SEN) For connecting any sensor resistance of which varies with the measured parameter.
Frequency Counters
15
The terminal 15 can measure the frequency of a bipolar signal (that goes to both negative and positive values).
Common ground for signals
5,11, 16,27
GND
32
6
7 8 9 10
SQR2
Fixed frequency sine wave generator, frequency is around 100Hz. Can generate a square wave, swings from 0 to 5 volts. Frequency is programmable from 15Hz to 1MHz. Can generate a square wave, swinging from 0 to 5 volts. Frequency can be set any where between 0.7Hz and 90kHz. The oscillator requires an external variable resistor, 22k, between 8 and 9. Output frequency is 488 Hz. Duty cycle can be programmed from 0 to 100% in 255 steps.
For voltage measurement. Can measure voltage within the 5 volts range. Input must be within the 0 to 5 volts range.
26 25 24
Bipolar voltage output (BPV). Can be programmed to any value between -5V to +5V. Unipolar voltage output. Can be programmed between 0 and +5V. This is just the output at BPV coming out through a 1k resistor Programmable to any value from 0.05 to 2.0 milliAmpere
30 31
29 28
BPV UPV
IV Constant Current Source(CS) Inverting Amplifiers 1513 1412 1718
15 13 14 12 17 18
There are 3 Inv. Amplifiers. Amplifier A: Input to at terminal 15 and output at 13. Default Gain = 50. The gain can be reduced by feeding the input through a series resistor . Amplifier B: Input at terminal 14 and output at 12. Amplifier C: Input at 17 and output at 18. Default Gain=100. The gain can be reduced by feeding the input through a series resistor.
The input is at 21 and output at 22. The gain is
Non-Inverting Amplifier 21
RC circuit
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