Model 2351 OCXO Calibrator  * OCXO set point programming is done with a fully
isolatedandfloatingcurrentsource.Thecurrentsource
range is 0 to 1 mA in 0.3 uA steps. *To calibrate,attach the 2 wires of the isolated current
source to the OCXO's oven control
circuit. *The user can program the calibration sweep current range and stepsize.  * Up to 16 calibration positions. Add
calibration positions in increments of 4
positions.The basic configuration is 4
DUT test positions for calibration.Up-
grade is permitted in the field.  * All of the 16 positions are always
available for aging measurements.  *  Personality cards from the Model  2201 and Model 2350 System are
used on the Model 2351.  * A mixture of products can be cali-
brated on the system and devices can
be started and finish testing independently.  * DUT power supplies are the same as used on the Model 2201and Model  2350 System  *System can measure OCXOs made with AT and SC cut crystals  *  Data reduction software plots the
oven control resistance versus fre-
quency function. The data is fit to a
mathematical polynomial. The resistance at the maxima or minima is solved for and placed on the data or plot printout  System Features  NOTE:  PRA  Inc.  reserves  the  right  to  make
changes to the product contained in this data
sheet in order to improve the design or perfor-
mance and to supply the best possible product.
PRA Inc. reserves the right to make these changes
without notice.  Revised 9/1/02  Model 2351 Ovenized Crystal Oscillator  Oven  Set point Calibration and Aging System        Up to 16 each OCXOs mounted on Personality Cards are
automatically measured. Frequency versus oven temperature set  point and Frequency versus time.  CALIBRATION:            User programs the current range of an isolated DAC, the system sweeps the
current range which programs the oven set point and logs the resistance versus
frequency function of an uncalibrated OCXO. The data reduction program finds
the oven "turn over point".  AGING:  All aging capabilities of a Model 2350 System can be done in positions  not being used for OCXO oven calibration