To use. Select the mode that works best for your application.
Horizontal mode
Automatic. Use this mode to set the Scale and Sample Rate; the
record length is a dependent variable. If the current time-per-division
scale has a record length equal to the record length limit, changing
the time-per-division to a larger value will decrease the sample rate
to the next available setting. If the current record length is less than
the record length limit, the record length can exceed the record
length limit by one record length setting. If the sampling mode is real
time, and the sample rate is at the real-time limit, attempting to
increase the sample rate has no effect.
To set the Record Length Limit, click the Advanced button and enter
the limit in the Set Record Length Limit dialog box. You can use the
buttons or keypad. The instrument will keep the set record length
near this limit to produce the best sequence of reduction in sample
rate, as the time-per-division is increased.
Record length limiting takes place when you change the time-per-
division setting. You can use the Sample Rate control to temporarily
exceed the record length limit by any amount. The default maximum
limit depends on the instrument model and record length option you
purchased.
TIP. You can use the front panel Horizontal Resolution knob to
change the sample rate in Automatic mode.
NOTE. The instrument supports Mask testing in Automatic mode
only.
Constant Sample Rate. Use this mode to set the Sample Rate and
Scale; the record length is a dependent variable. For ≥4 GHz
instrument models, the default sample rate supports bandwidth filter
operation. The maximum record length for your instrument depends
on instrument model and record length option.
TIP. You can use the front panel Horizontal Resolution knob to
change the sample rate in Constant Sample Mode.
Manual. Use this mode to set the Sample Rate and Record Length;
the horizontal scale is a dependent variable calculated from the
sample rate and record length.
TIP. You can use the front panel Horizontal Scale knob to change
the record length in Manual mode.
Oscilloscope reference
818 DPO70000SX, MSO/DPO70000DX, MSO/DPO70000C, DPO7000C, and MSO/DPO5000B Series
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