Oscilloscope Reference Horizontal modes
Horizontal mo de
Automatic. Use this mode to set the Scale and Sample
Rate; the reco
rd 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 val
ue 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, attemp ting to increase the sample rate has no effect.
To set the Re
cord 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 t
he set record length near this limit to produce
the best sequence of reduction in sample rate, as the
time-per-division is increased.
Record len
gth limiting takes place when you change the
time-per-division setting. You can use the Sample R ate
control to temporarily exceed the record length limit by
any amoun
t. 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 ch
ange 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 an
d Scale; the record length is a dependent variable.
For ≥4 GHz instrument models, the default sample rate
supports bandwidth fi lter 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 t
o change the sample rate in Constant Sample Mode.
Manu
al. 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 k nob to
change the record length in Manual mode.
xxx
Behavior
Sample rate, scale, and record length are interactive in all modes. If you increase the scale, the sample rate
must decrease if either the maximum record length or the record length limit you set is reached.
902 DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series
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