3-16
Making Time Domain Measurements
Time Domain Low Pass Mode
Minimum Allowable Stop Frequencies
The lowest analyzer measurement frequency is 30 kHz (300 kHz for the 8753ET), therefore for each value of
n there is a minimum allowable stop frequency that can be used. That is, the minimum stop frequency = n
30 kHz.
Tabl e 3-2 lists the minimum frequency range that can be used for each value of n for low pass time
domain measurements.
Reflection Measurements in Time Domain Low Pass
Figure 3-12 shows the time domain response of an unterminated cable in both the low-pass step and
low-pass impulse modes.
Figure 3-12 Time Domain Low Pass Measurements of an Unterminated Cable
Interpreting the Low Pass Response Horizontal Axis
The low pass measurement horizontal axis is the two-way travel time to the discontinuity (as in the
bandpass mode). The marker displays both the two-way time and the electrical length along the trace. To
determine the actual physical length, enter the appropriate velocity factor as described in
"Time Domain
Bandpass Mode" on page 3-12.
Tab le 3-2 Minimum Frequency Ranges for Time Domain Low Pass
Number of Points Minimum Frequency Range Number of Points Minimum Frequency Range
3 30 kHz to 0.09 MHz 201 30 kHz to 6.03 MHz
11 30 kHz to 0.33 MHz 401 30 kHz to 12.03 MHz
26 30 kHz to 0.78 MHz 801 30 kHz to 24.03 MHz
51 30 kHz to 1.53 MHz 1601 30 kHz to 48.03 MHz
101 30 kHz to 3.03 MHz
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