HP E1725C Getting Started Manual page 37

Chapter 2 Practice Using the TIA
TIA Tutorial
Parameters for:
This portion of the window lets you modify parameters that are
inherent in the measurement processing, such as the measurement
time, the number of measurement points during that time, window
types for FFT computations, etc.
Next to "Phase & Frequency Deviation," (or "Period, Frequency, TI,
& Phase" in the HP E1743A/44A) you will see that you can modify the
number of frequency measurements or points to be displayed, and the
time duration of the measurement. In general, the "gate time" for each
frequency measurement is the measurement time divided by the
number of samples. Note however, that the measurement gate is
synchronized to the input signal and the actual measurement time may
differ from the value entered here.
You can modify each of these parameters by either double-clicking on
the desired item, or clicking on the desired item and clicking the
Modify>> button. Other measurement types are available with their
own sets of parameters to configure.
Filter
You may select a filter type (low pass, high pass, band pass, or
smoothing function) to be applied to the measurement results. If either
the low pass, band pass, or high pass filters are selected, you can also
enter the cut-off frequencies.
Clock/Carrier Frequency
Deviation measurements (phase deviation, frequency deviation, time
deviation, etc.) require a reference carrier or clock to compute the
relative measurement. This portion of this window lets you enter the
frequency of the reference clock directly, or have the
HP E1742A/43A/44A/46A/48A estimate the reference frequency for
you based upon the acquired data. Various carrier estimation
algorithms are also available, depending on the type of signal and
modulation you want to measure.
Getting Started Guide 2-11