Expt 2 Klystron Power Supply 3s2766
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1 Microwave Engineering
EXPERIMENT NO. 2 Aim : To Study about Klystron Power Supply. Apparatus :
Klystron Power Supply Klystron Mount Isolator Frequency Meter Variable Attenuator Detector Mount Oscilloscope BNC Connector Cooling Fan
Theory :
Klystron Power Supply, is a state-of-the-art solid-state, regulated power supply for operating low power Klystrons. Klystron Power Supply For the klystron based microwave bench. Klystron power supply generates required beam and repeller voltage for the X-Band klystron tube like 2K25. It is very stable and contains the short circuit protection circuit. Also it has amplitude and frequency modulation circuits for the generation of 1 KHz square wave and the saw tooth wave. • • • • • • • • • •
Specifications Model SKPS-610 Beam Supply: Voltage Range: 200-450 V continuously Variable Current: 50mA Max Regulation: Better than 0.5% for 10% variation in the mains supply voltage Ripple: Less than 5 mV rms Repler supply Voltage Range: 10V to 270 V DC Continuously variable with respect to klystron cathode Regulation: 0.25% for 10% variation in the mains supply voltage Heater Supply: 6.3 V DC (Regulated) Modulation: Square Wave: Max. Amplitude: + 110 V peak to peak Freq.: 500 Hz-2000Hz Amplitude and frequency continuously variable Sawtooth: Amplitude: -60 V max. peak to peak Freq.: 50 Hz-150 Hz Amplitude and frequency continuously variable Operating Voltage: 230V 10%, 50 Hz, A.C.
Vishwakarma Govt. Engg. College,EC Department
Page 1
2 Microwave Engineering
Block Diagram :
Klystron Power Supply SK PS-610
2K 25 Klystron Mount XM-251
Isolator XI-621
Frequency meter XF-455
Variable Attenuator XA-520
Detector Mount XD-451
Oscilloscope
Procedure :
1. Set the work bench as per block diagram. 2. When power supply is off from mains : Beam fully anticlockwise. Repeller fully clockwise. 3. HT ‘OFF’. 4. Mod : AM 5. Meta switch :V (volts) 6. Switch ON power supply from mains. 7. Slowly increase beam voltage up to 300 volts. 8. Keep meta switch on ‘Repel’ & observe square wave on CRO. Measure voltage on it. 9. Keep meta switch on ‘c’ & measure current(mA). 10. Take readings for different ‘Repel’ voltages & note down readings. 11. Calculate output power for corresponding volt & current. 12. Plot graph of o/p power versus repeller volt.
Vishwakarma Govt. Engg. College,EC Department
Page 2
3 Microwave Engineering
Observation Table : Repeller Voltage
Vout
Vishwakarma Govt. Engg. College,EC Department
Iout(mA)
Page 3
Pout
4 Microwave Engineering
Calculation :
Conclusion :
Vishwakarma Govt. Engg. College,EC Department
Page 4
EXPERIMENT NO. 2 Aim : To Study about Klystron Power Supply. Apparatus :
Klystron Power Supply Klystron Mount Isolator Frequency Meter Variable Attenuator Detector Mount Oscilloscope BNC Connector Cooling Fan
Theory :
Klystron Power Supply, is a state-of-the-art solid-state, regulated power supply for operating low power Klystrons. Klystron Power Supply For the klystron based microwave bench. Klystron power supply generates required beam and repeller voltage for the X-Band klystron tube like 2K25. It is very stable and contains the short circuit protection circuit. Also it has amplitude and frequency modulation circuits for the generation of 1 KHz square wave and the saw tooth wave. • • • • • • • • • •
Specifications Model SKPS-610 Beam Supply: Voltage Range: 200-450 V continuously Variable Current: 50mA Max Regulation: Better than 0.5% for 10% variation in the mains supply voltage Ripple: Less than 5 mV rms Repler supply Voltage Range: 10V to 270 V DC Continuously variable with respect to klystron cathode Regulation: 0.25% for 10% variation in the mains supply voltage Heater Supply: 6.3 V DC (Regulated) Modulation: Square Wave: Max. Amplitude: + 110 V peak to peak Freq.: 500 Hz-2000Hz Amplitude and frequency continuously variable Sawtooth: Amplitude: -60 V max. peak to peak Freq.: 50 Hz-150 Hz Amplitude and frequency continuously variable Operating Voltage: 230V 10%, 50 Hz, A.C.
Vishwakarma Govt. Engg. College,EC Department
Page 1
2 Microwave Engineering
Block Diagram :
Klystron Power Supply SK PS-610
2K 25 Klystron Mount XM-251
Isolator XI-621
Frequency meter XF-455
Variable Attenuator XA-520
Detector Mount XD-451
Oscilloscope
Procedure :
1. Set the work bench as per block diagram. 2. When power supply is off from mains : Beam fully anticlockwise. Repeller fully clockwise. 3. HT ‘OFF’. 4. Mod : AM 5. Meta switch :V (volts) 6. Switch ON power supply from mains. 7. Slowly increase beam voltage up to 300 volts. 8. Keep meta switch on ‘Repel’ & observe square wave on CRO. Measure voltage on it. 9. Keep meta switch on ‘c’ & measure current(mA). 10. Take readings for different ‘Repel’ voltages & note down readings. 11. Calculate output power for corresponding volt & current. 12. Plot graph of o/p power versus repeller volt.
Vishwakarma Govt. Engg. College,EC Department
Page 2
3 Microwave Engineering
Observation Table : Repeller Voltage
Vout
Vishwakarma Govt. Engg. College,EC Department
Iout(mA)
Page 3
Pout
4 Microwave Engineering
Calculation :
Conclusion :
Vishwakarma Govt. Engg. College,EC Department
Page 4
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