Hi

I'm working with an HP 8753C Network analyzer to continuously measure the peak frequency of a 5MHz Quartz crystal microbalance[QCm or TSM resonator].I'm using GPIB communication and labview for data collection.My data looks very quantised [discrete] for for small [>100Hz] frequency changes.I have tried changing my span ,number of points,resolution,reference points,also i have turned on averaging,smoothing and have IF BW at 300 Hz.Inspite of this I have not been able to get continous data.Is there some function that I need to activate to get continous data and also manage to detect small frequency changes?

I would be grateful if you can help me out

I'm working with an HP 8753C Network analyzer to continuously measure the peak frequency of a 5MHz Quartz crystal microbalance[QCm or TSM resonator].I'm using GPIB communication and labview for data collection.My data looks very quantised [discrete] for for small [>100Hz] frequency changes.I have tried changing my span ,number of points,resolution,reference points,also i have turned on averaging,smoothing and have IF BW at 300 Hz.Inspite of this I have not been able to get continous data.Is there some function that I need to activate to get continous data and also manage to detect small frequency changes?

I would be grateful if you can help me out

In addition, and this is a small effect, the underlying math functions in the 8753 have a limitaition in the resolution of the real and imaginary parts. The numbers are represented as Re+jIm, and the Re and Im parts share a common exponent, with an 16 bit mantissa, so the the real and imaginary parts have a maximum ration 2^15:1, which sets the minimum angle that can be represented to the atan(2^15). This causes a limit of about -90 dB residuals (you can sometimes see them in the time domain).