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Question about HP3586B and measuring Power.
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One of the inputs on the 3596B is a 75ohm, another is a 10k ohm//50pf.
?I can understand with a Voltage across a 75 ohm resistor how? to get a power reading. What happens when you switch the unit to 10k ohms. Does it start measuring Voltage across a 10k, and do that calculation. ?The question arose when as? practice for OpenOffice I thought I'd calculate how the power reading misbehaves, if I terminate the input with 50 ohms and measure a fixed voltage from 1MHz to 32MHz. ?The 50pf throws a changing impedance in the mix. In OpenOffice I combined 50ohms, 10k ohms and the 50pf cap impedance to get a total impedance over the frequency span. Then when I went to calculate power, I didn't know where the machine would be referenced. ?Please note, my concern is not really to do the measurement this way is is just an exercise to practice OpenOffice and draw a graph of the error. |
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Tom Miller
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The 3596 was used to measure carrier levels in a multiplexed
system at 75 ohms. The 75 ohm input would be used to terminate a 75 ohm output
directly. The 10k input would have been used to bridge a terminated output to
make the same measurement. One place this would be done would be in a analog
multichannel SSB microwave baseband system.
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