Tektronix P7625, Quick Start User Manual, Page: 48 / 88

Basic Operation
Improving Measurement Accuracy
This section covers some of the features and characteristics of the probe that can affect the accuracy of your measurements, and
some steps that you can take to improve the performance of the probe.
Temperature Compensation
The P7600 Series probes employ temperature compensation to optimize measurement accuracy. Whenever a probe setting is
changed, such as Input Mode, Offset Voltage, or vertical scale factor, a temperature compensation update occurs. Continuous
temperature compensation is not done to avoid introducing noise into the probe ampli
fi ers.
When the probe is fi rst powered on from a cold start condition, you must allow the probe and oscilloscope a 20 minute warm-up
period. After the warm-up period, you should adjust or toggle a probe setting, such as the vertical scale factor, to trigger the
temperature compensation update. Otherwise, a cold temperature compensation value may be used, which would result in a
small gain error.
DSP Correction
The P7600 Series probes contain S-parameter characterization data for the probe, which is downloaded to the attached
oscilloscope when the probe is
fi rst connected. This probe-speci fi c data is used along with nominal probe adapter data to generate
DSP correction fi lters that are used for improved high frequency measurement accuracy. After the probe adapter is attached to the
probe, the adapter transfers identi fi cation data which is used as part of the generated fi lter process.
34 P7600 Series TriMode Probes Quick Start User Manual