HP 84811A Operating And Service Manual page 7

HP 84811A
Page 5
RETURN LOSS PERFORMANCE TEST (cont'd)
MICROWAVE AMPLIFIER POWER
Figure 1. Return Loss Performance Test Setup
NOTES
Use the appropriate microwave amplifier depending on the frequency of
interest.
■
type N coaxial open is required only for measurements above ■
.
10 GHz.
1. Set the coaxial step attenuator to 11 dB of attenuation. Connect the equipment as
shown in Figure 1. Allow at least one half hour for the equipment to warm up. Then
before doing the performance test, be sure the test port output of the coupler is less than
100 mW.
2. Set the sweep oscillator to CW, and set to the frequency of interest. Make sure that
the microwave amplifier is compatible with the frequency of the sweep oscillator.
Frequency of interest __
3. Using the 10 dB coaxial attenuator connected to the test port of the dual directional
coupler, measure the power output with power meter #2. Adjust the sweep oscillator
and/or the microwave amplifier for+10 dBm at the attenuator output Read and record
me power level of power meter #1. This value is the incident wave reference level.
Remove the attenuator and connect power meter #2 to the reflected port of the dual
directional coupler.
Power Meter #1 (Incident Wave Reference Level) __
4. Terminate the test port of the dual directional coupler with a type N open con¬
structed from the parts listed in the equipment list. It is not necessary to use this