Acquisition Modes
3–6
TDS 420A, TDS 430A, TDS 460A & TDS 510A User Manual
NOTE. In Hi Res mode the frequency of the external clock signal (TDS 460A,
TDS 430A, and TDS 420A only) must be less than or equal to the frequency set
in the external clock menu. If the frequency of the external clock signal is greater
than the frequency in the menu, the displayed waveform will have the wrong
amplitude.
This mode only works with real-time, non-interpolated sampling. If you set the
time base so fast that it requires real-time interpolation or equivalent-time
sampling, the mode automatically becomes Sample, although the menu selection
does not change.
A key advantage of Hi Res is its potential for increasing resolution regardless of
the input signal. Tables 3–1 and 3–2 illustrate how you can obtain up to
15 significant bits with Hi Res mode. Note that resolutions above 15 bits are not
allowed. The bits of resolution shown in the tables are theoretically achievable.
Actual resolution may vary as a function of the correlated noise sources in the
test environment.
Table 3–1: TDS 460A, TDS 430A, and TDS 420A Resolution
Bits
Time Base Speed Bits of Resolution
1 s and faster 8 bits
2 s to 5 s 9 bits
10 s to 20 s 10 bits
50 s to 100 s 11 bits
200 s to 500 s 12 bits
:
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ts
Time Base Speed Bits of Resolution
400 ns and faster 8 bits
1 s to 2 s 9 bits
5 s to 10 s 10 bits
20 s to 50 s 11 bits
50 s to 100 s 11 bits
100 s to 200 s 12 bits
500 s 13 bits
1 ms to 2 ms 14 bits
5 ms and slower 15 bits
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