5451 signal power loss

[dls1]

We are generating a signal from a file that is having different power levels at various points.

When we generate from 5451 at 70 MHz, the center signal is coming at exact power level of -10 dBm and the other frequency components power level is coming very low.

For eg. 72 MHz, Actual from file is -15 dBm; generated and observed in Scope is -50 dBm

68 Mhz, Actual from file is -15 dBm; generated and observed in Scope is -50 dBm

66 MHz, Actual is -20 dBm; Generated is -60 dBm; Same with 74 MHz.

What is the reason behind this?

Whatever data is given as Arbitrary Input to the AWG, through SW when FFT is calculated, the power levels are same as the one present in the file.

We need to generate exactly the same signal as present in the file, including power level. What is it that we have to do?

Regards,

Srikanth

[KyleTTU]

Hi Srikanth, 

Just to get some background info, what type of signals are being generated? What device are you using to measure these signals?  Are all of your impedances appropriately matched?  And finally would it be possible to attach the file used for waveform generation?  What I am mainly curious about is if you are trying to generate a single signal at 70MHz or if you are trying to generate at 70, 72, 68,and 66MHz at different power levels.

Regards,

Kyle S