Tektronix MDO4000C Series, User Manual

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Auto-magnify
As you adjust the horizontal scale control to faster time/division settings, the
MDO4000C Series automatically increases the sample rate to keep acquiring the
same record length in the shorter period of time. Eventually though, the
oscilloscope hits the maximum sample rate. Once the instrument is at its fastest
sample rate, further changes to faster timebase settings cause the oscilloscope to
operate in Auto-magnify mode, where the oscilloscope shows the faster desired
time/division setting and continues to acquire the desired record length. The
result is that the oscilloscope cannot show all of the acquired points within the
desired time/division setting.
Instead, the oscilloscope shows you only a portion of the entire record in the
time-domain graticule. This feature provides you with a way to magnify a portion
of the record without having to use the smaller zoom screen display. This feature
gives you the maximum benefit of the sample rate / record length combination in
your oscilloscope. With Auto-magnify, you have access to the full record length
at the maximum sample rate.
NOTE.
Auto-magnify only comes on when the zoom feature is turned off.
1. The entire acquisition is indicated by the horizontal bar in the upper display.
2. The portion of the acquisition shown in the time domain graticule is shown
within the part of the upper display defined by the brackets.
NOTE.
If you are using the frequency domain and auto-magnify features at the
same time, and if you move the spectrum time outside of the portion of the
acquisition shown in the graticule, then the orange bar in the time-domain
display showing the spectrum time will disappear, as will any activity in the
frequency domain display.
Analyze waveform or trace data
100 MDO4000C Series Oscilloscope User Manual
Preliminary