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Mass Spectrometry System Test Specification

SYSTEM TEST CASES

00001: Ensure complete emptying of air

 

Step Step description Expected result
precondition system is off  
Switch On the system turn on the pump 95% vacuum
Having a leak Possibility of air leakage in places: welding-flanges-anode-cathode-plates-tungsten-windows-detector . Seal the leakage places
Switch Off the system turn Off the pump the pump stops pulling out the air
Silicon use Put silicon in places where air leaks Stop leakage and get 95% vacuum when we restart the pump.
Postcondition System is off  

 

00002: Power supply (P4)

 

Step Step description Expected result
Precondition System is Off  
Switch On the system turn on the power supply (P4) Get continuous power (17 V)
Switch Off the system turn Off the power supply (P4) Continuous power stops
Postcondition System is Off  

 

00003: First plate positively charged

 

Step Step description Expected result
Precondition System is Off  
Switch On the system turn on the power supply (P9) Get continuous power ( 17 v)
Switch Off the system turn Off the power supply (P9) Continuous power stops
Postcondition System is Off  

 

00004: Second plate positively charged

 

Step Step description Expected result
Precondition System is Off  
Switch On the system turn on the power supply (P8) Get continuous power (.... v)
Switch Off the system turn Off the power supply (P8) Continuous power stops
postcondition  system is off  

 

00005: Get electrons

 

Step Step description Expected Result

Precondition

System is Off  

Switch On the valve (V1)

turn On the valve (V1) the valve (V1) is open
Switch On the pump turn On the pump 95 % vacuum
Switch On the power supply (P4) turn On the power supply (P4) Get continuous power (17 V)
Switch On the power supply (P9) turn On the power supply (P9) Get continuous power (17 V)
Burning the Tungsten  Burn the Tungsten by supplying it with 17 V power (P9)

Get electrons around the Tungsten (the lamp will light)

electron trap the power supply (P9) is connected to the first plate

The first plate positively charged attracts the electrons towards it (electrons in motion )

Switch Off the power supply (P9) turn Off the power supply (P9)

electrons are not in motion

Switch Off the power supply (P4) turn Off the power supply (P4) the lamp will turn Off
Switch Off the pump turn Off the pump the pump stops pulling out the air
Switch Off the valve (V1) turn Off the valve (V1) the valve (V1) is close
Postcondition System is Off

 

 

00006: Detector

 

Step Step description Expected result
Precondition System is Off  
Switch On the system Turn On the detector the detector gives a signal when it receives ions
Switch Off the system Turn Off the detector detector is not running
Postcondition System is Off  

 

 

00007: Ionization 

 

Step Step description Expected Result
Precondition System is Off  
Switch On the valve (V1) turn On the valve (V1) the valve (V1) is open
Switch On the pump turn On the pump 95% vacuum
Switch On the power supply (P4) turn On the power supply (P4) Get continuous power (17 V)
Switch On the power supply (P9) turn On the power supply (P9) Get continuous power (17 V)
Burning the Tungsten Burn the Tungsten by supplying it with 17 V power (P9) Get electrons around the Tungsten (the lamp will light)
electron trap the power supply (P9) is connected to the first plate The first plate positively charged attracts the electrons towards it (electrons in motion )
Switch Off the pump turn Off the pump  the pump stops pulling out the air
Switch Off the valve (V1) turn Off the valve (V1) the valve (V1) is close
Switch On the detector turn On the detector detector is running
Switch On the valve (V2) turn On the valve (V2), enter the vapor simple, after a few minutes turn Off the valve (V2) the electrons will collide with the atoms of the vapor sample (Get ions have a charge (+1))
switch On the power supply (P8) turn On the power supply (P8) Get continuous power (.... V)
ion repeller the power supply (P8) is connected to the second plate  the detector gives a signal (this indicates that the second plate positively charged repulsed the ions out of the ionization chamber, and the ions entered the tube)
Switch Off the detector turn Off the detector detector is not running
Switch Off the power supply (P8) turn Off the power supply (P8) The second plate is no longer charged
Switch Off the power supply (P9) turn  Off the power supply (P9) The first plate is no longer charged
Switch Off the power supply (P4) turn Off the power supply (P4) the lamp will turn Off
Postcondition System is Off  

 

00008:Power supply (P5)

 

Step Step description Expected result
Precondition System is Off  
Switch On the system turn on the power supply (P5) Get continuous power (300 V)
Switch Off the system turn Off the power supply (P5) Continuous power stops
Postcondition System is Off  

 

00009: Helmholtz Coil

 

Step Step description Expected Result
Precondition System is Off  
Switch On the system Turn On the Helmholtz Coil by providing it with an power supply (P6)  Get magnetic field ( B= 0.2 T)
Switch Off the system Turn Off the Helmholtz Coil  Magnetic field stops
Postcondition System is Off  

 

 

 

000010: Acceleration and Deflection

 

Step Step description Expected Result
Precondition System is Off  
Switch On the valve (V1) turn On the valve (V1) the valve (V1) is open
Switch On the pump turn On the pump

95% vacuum

Switch On the power supply (P4) turn On the power supply (P4)

Get continuous power (17 V)

Switch On the power supply (P9) turn On the power supply (P9)

Get continuous power (17 V)

Burning the Tungsten Burn the Tungsten by supplying it with 17 V power (P9)

Get electrons around the Tungsten (the lamp will light)

electron trap the power supply (P9) is connected to the first plate

The first plate positively charged attracts the electrons towards it (electrons in motion )

Switch Off the pump turn Off the pump 

the pump stops pulling out the air

Switch Off the valve (V1) turn Off the valve (V1)

the valve (V1) is close

Switch On the detector turn On the detector detector is running
Switch On the valve (V2) turn On the valve (V2), enter the vapor simple, after a few minutes turn Off the valve (V2) the electrons will collide with the atoms of the vapor sample (Get ions have a charge (+1))
Switch On the power supply (P8) turn On the power supply (P8) Get continuous power (.... V)
Switch On the power supply (P5) turn On the power supply (P5) Get continuous power (300 V)
Switch On the Helmholtz Coil turn On the Helmholtz Coil on the curved tube Get magnetic field (B=0.2 T)
ion repeller the power supply (P8) is connected to the second plate  the second plate positively charged repulses the ions out of the ionization chamber, and the ions enters the tube
Ions acceleration Connecting the power supply (P5) to the three plates at the beginning of the tube the ions that entered the tube will be accelerated
Ions deflection Ions will subjected to a magnetic field of B= 0.2 T when they pass through the curve.   the detector gives a signal (this indicates that the ions left the ionization chamber, entered the tube, accelerated by the plates, deflected by the magnetic field and were detected)
Switch Off the power supply (P5) turn Off the power supply (P5) ions acceleration stops, no signal will appear
Switch Off the detector turn Off the detector detector is not running
Switch Off the Helmholtz Coil turn Off the Helmholtz Coil Magnetic field stops
Switch Off the power supply (P8) turn  Off the power supply (P8) The second plate is no longer charged
Switch Off the power supply (P9) turn Off the power supply (P9) The first plate is no longer charged
Switch Off the power supply (P4) turn Off the power supply (P4) The lamp will turn Off
Postcondition System is Off  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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