Dear Sir,

Can you tell me what is the SI unit of amplitude modulation?

Also the frequency and phase modulation as well?

I wish to know how to put them in the S.I units?

I know all the units are in Hz..hertz over Hertz cancels off leaving a relative value, true?

For the calculation of amplitude,phase and freq modulation using the 8902S system,

it is stated in the specs that the bmc is as 3% + 1 digit (what is the digit here- is it the noise floor,resolution or what?)

Appreciate the help.

Also when i state my bmc for the tuned rf level for a certain range..

say for an example my bmc for a tuned rf level measurement from the range 0dB to 10 dB is 0.03 dB,

what does this mean?

Does it mean 0.03dB of the range or the reading?

Rgds

Ruben

Can you tell me what is the SI unit of amplitude modulation?

Also the frequency and phase modulation as well?

I wish to know how to put them in the S.I units?

I know all the units are in Hz..hertz over Hertz cancels off leaving a relative value, true?

For the calculation of amplitude,phase and freq modulation using the 8902S system,

it is stated in the specs that the bmc is as 3% + 1 digit (what is the digit here- is it the noise floor,resolution or what?)

Appreciate the help.

Also when i state my bmc for the tuned rf level for a certain range..

say for an example my bmc for a tuned rf level measurement from the range 0dB to 10 dB is 0.03 dB,

what does this mean?

Does it mean 0.03dB of the range or the reading?

Rgds

Ruben

I'm not sure I understand your question. Modulation index is a ratio, so as you say, the units cancel out. AM index is about amplitude variations, so the units that cancel aren't always Hz.

You can think about units if that helps, dBm/dBm or Hz/Hz, but you see that since it is a ratio, then converting it into some other units won't have any effect.

I don't have a copy of the 8902S data sheet, as I'm sure you know it is no longer in its support life. I never supported it and I don't know it well, but I expect the +1 digit refers to resolution, it is one increment of the least significant digit on the display.