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Fri Aug 29 18:24:48 2008
PMC: PZT Calibration
I calibrated the PMC PZT at DC by using 'trianglewave' to drive the DC offset slider
and reading back PMC_PZT and PMC_TRANSPD_F (both are DC coupled DAQ channels).
The attached PDF illustrates the method: look at the voltage required to span 1 FSR and then divide.
PMC_cal (m/V) = (1064 nm)/2 / V_FSR
calibration for our PZT is therefore 10.4 nm/V.
full scale (0-300 V) range is 3.1 microns.
From Jenne's elog entry we know that the series resistor to the PZT is 63.6 kOhms. The PZT is labeled as
having a capacitance of 279 nF. So the PMC drive's
pole frequency is 1/2/pi/63.6e3/279e-9 = 9 Hz +/- 0.5 Hz
The cable capacitance is ~20 pF/foot so its not significant for this.
The template file is Templates/PMC-PZTcal.xml.
Using the above calibrations, also plot the calibrated PMC ERR and PZT spectra.
Uploaded Fri Aug 29 19:34:52 2008