Measurements

• Hot wire ammeter and thermocouple meters can measure average power through its heating effect
• RF power is normally measured by a diode probe of adequate bandwidth and a d.c. voltmeter calibrated to measure as watts the voltage across a fixed (50Ω) resistor load;  some may be connected inline
• P_out = V²÷R
• Average power is over a period of time;  PEP is instantaneous;  meters (which also measure VSWR) are available with time constants and calibration to measure both
• An oscilloscope which shows the envelope of an RF signal may also be used with a calibration scale

Course Guide Topics

1. Making Measurements
2. D.C. & A.C.
3. Voltage and Current (1)
4. Voltage and Current (2)
5. Loading effect of meter
6. Voltage and Current (3)
7. Resistance
8. Making Measurements – Voltage (V)
9. Making Measurements – Current (I)
10. Making Measurements – Resistance (R)
11. Power (1)
12. Power (2)
13. VSWR (1)
14. VSWR (2)
15. HF Station
16. HF Station showing SWR meter
17. RF Envelope
18. Frequency
19. Grid Dip Oscillator (GDO) (1)
20. Grid Dip Oscillator (GDO) (2)
21. Multirange Meter
22. Multimeter Use Summary
23. RF Power Meter
24. SWR Meter
25. Signal Generator
26. Frequency Counter
27. Oscilloscope (1)
28. Oscilloscope (2)
29. Spectrum Analyser
30. Other Instruments
31. Dummy Load