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Acquisition
TDS 620A, 640A, & 644A User Manual
Table 2-1: Sampling Mode Selection —
100 ns/Div to 50 ns/Div (When Fit to Screen is Off)
Instrument and
Number of Channels
100 ns/Div 50 ns/Div
TDS 544A & 540A,
any 1 channel
Real-time Real-time
TDS 544A & 540A,
any 2 channels
Real-time Equivalent-time or
interpolated real-time
TDS 544A & 540A,
3 or more channels
Equivalent-time or
interpolated real-time
Equivalent-time or
interpolated real-time
TDS 524A & 520A,
any 1 channel
Real-time Equivalent-time or
interpolated real-time
TDS 524A & 520A, any
2 channels
Equivalent-time or
interpolated real-time
Equivalent-time or
interpolated real-time
The digitizing oscilloscope supports five acquisition modes.
Sample
Peak Detect
Hi Res
Envelope
Average
Sample acquisition mode, which acquires in real time, is the mode most
commonly used. You can read about Sample and the other acquisition modes
in
Acquisition Modes,
beginning on page 3-3.
Bandwidth
refers to the range of frequencies that an oscilloscope can acquire
and display accurately (that is, with less than 3 dB attenuation).
You can set different bandwidths with the digitizing oscilloscope. Lower band-
width settings let you eliminate the higher frequency components of a signal.
The TDS 600A series offers Full (500 MHz), 100 MHz, and 20 MHz band-
width settings.
You can couple your input signal to the digitizing oscilloscope three ways. You
can choose between AC, DC, or Ground (GND). You can also set the input
impedance.
DC coupling shows both the AC and DC components of an input signal.
AC coupling shows only the alternating components of an input signal.
Acquisition Modes
Bandwidth
Coupling