Response Resolution; Range Resolution - HP 8753E User Manual

While increasing the frequency span increases the response resolution, keep the following
points in mind:
noise floor. Because of this, if the frequency domain data points are taken at or below the
measurement noise floor, the time domain measurement noise floor is degraded.
the measurement. If the frequency domain data is measured out-of-band, the time domain
measurement is also the out-of-band response.
You may (with these limitations in mind) choose to use a frequency span that is wider than the
test device bandwidth to achieve better resolution.
Range resolution. Time domain range resolution is defined as the ability to locate a single
response in time. If only one response is present, range resolution is a measure of how closely
you can pinpoint the peak of that response. The range resolution is equal to the digital
resolution of the display, which is the time domain span divided by the number of points on the
display. lb get the maximum range resolution, center the response on the display and reduce
the time domain span. The range resolution is always much liner than the response resolution
(see Figure 6-74).
Figure 6-74. Range Resolution of a Single Discontinuity
Figure 6-73. Response Resolution
1 . 3 2 1 ns
I I I I
S T O P 2 . 5 0 5 ns
1: 7 . 4 2 1 5 mU
1.321
I
I
I I
S T O P I.505 ns