Download - ppt of mdas
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Introduction
• It is PC based instrument designed using industry standard PIC18F4550 from microchip corp.
• It has idyllic GUI designed using visual C# .net 2005.
• It has 6 different modules.
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Modules• Electronic counter.
• Programmable function generator.
• Digital carrier modulation
• Digital Multi-meter.
• Weather station.
• Digital storage oscilloscope. (DSO)
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Electronic counterDigital frequency counter
Digital time period measurement
Digital pulse width measurement
Digital duty cycle measurement
Digital phase angle measurement
Digital ratio measurement
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Digital frequency counter
Timer
At t = 0sec
Counter Counter
Timer
At t = 1sec
Synchronized SynchronizedCounter & timer start at t = 0sec.
Counter & timer stop at t = 1sec.
timer = 1 sec.
count = frequency
count = 0
timer = 0 sec.
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Digital time period measurement
Capture timer
Timer = X
Capture timer
Timer = Y
Time period = Y-X
Time period
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Digital pulse width measurement
Capture timer
Timer = X
Capture timer
Timer = Y
Time period = Y-X
Pulse width
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Digital phase angle measurement
+
_
+
_
X-OR gateCOMPARATOR
PHA
SE D
IFFR
AN
CE
INPUT WAVE
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Digital Multi-meter
• Digital voltmeter • Digital ohmmeter • Digital Capacitance meter
• Digital Inductance meter
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Digital voltmeter
A/D converterAnalog voltage Digital voltage
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Digital Capacitance meter
+
_
R
c
ΔV=0.693VCC
E=VCC
Q=0 at t=0sec.
COMPARATOR
Putting values in Eq. below
ΔV=E(1-e-t/RC)
Timer start Timer stop
R= constant
C= variable
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Digital ohmmeter
+
_
R
c
ΔV=0.693VCC
E=VCC
Q=0 at t=0sec.
COMPARATOR
Timer start Timer stop
C= constant
R= variable
Putting values in Eq. below
ΔV=E(1-e-t/RC)
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Weather station
•Temperature measurement
•Humidity measurement
•Atmospheric pressure measurement
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Temperature measurement
IC used: SHT11
Range: -40 to 123.8°C
Humidity measurement
IC used: SHT11
Range: 0 to 100%RH
Atmospheric pressure measurement
IC used: MPAX6115A
Range: 15 to 115kPa
Components used and ranges
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Digital carrier modulation
Binary Frequency shift keying generator (BFSK)
Binary Phase shift keying generator (BPSK)
Binary amplitude shift keying generator (BASK)
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Binary Frequency shift keying generator (BFSK)
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Binary Phase shift keying generator (BPSK)
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Binary amplitude shift keying generator (BASK)
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ΣPHASE-TO-AMPLITUDE
CONVERSION D/A CONVERSION
PHASE REGISTER
TUNING WORD
PHASE
ACCUMULATOR
24 TO 48 BITS
14 TO 16 BITS
Programmable function generatorProgrammable function generator
SYSTEM CLOCK
fc
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Working of Programmable function generator
Frequency is determined by the eq.
fOUT = output frequency of the DDSM = binary tuning wordfC = internal reference clock frequency (system clock= 20 MHz)n = length of the phase accumulator, in bits
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Amplitude control in Programmable function generator
+
_Rf
R1
R2
Digital potentiometer
By varying input control word we can control output voltage
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Digital storage oscilloscope (DSO)
• Single channel digital storage oscilloscope.
• Voltage range: 40V peak-to-peak
• Five User selectable time base.
• Nine user selectable voltage base.
• On screen rise time and total time display.
• On screen peak amplitude display.• Waveform storage capability.
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Thank you!