LeCroy DDA 7 Zi series, Operator'S Manual

Page: 236 / 544

WavePro 7Zi
235
WP700Zi-OM-E-RevA
Autosetup
When channels are turned on, you can run Autosetup on those channels. If no channels are turned on, all
channels are affected. When more than one channel is turned on, the first channel in numerical order with a
signal applied to it is automatically set up for edge triggering.
You can perform an autosetup of all these functions together by simply pressing Auto Setup on the front
panel, or by touching Auto Setup in the Vertical , Timebase , or Trigger drop-down
menu.
Real Time (SMART) Memory
LeCroy's Real Time (SMART) Memory feature ensures the highest time resolution for the time window displayed,
without aliasing. Real Time Memory provides these advantages:
x
Acquisition memory is automatically allocated as needed.
x
Memory size optimization: Set Maximum Memory optimizes memory to obtain highest sampling rate,
reducing the risk of aliasing. You can set a maximum memory up to 256 Mpts.
x
Fixed Sample Rate allows setting of a specific sample rate, with the scope calculating the amount of
memory needed for a timebase setting.
x
The entire acquisition is displayed on the screen.
x
High-speed compaction shows all significant features of your waveform.
You can set a maximum memory up to 256 Mpts.
Setting Up Real Time (SMART) Memory
1. Touch Timebase Horizontal Setup .
2. Under Real Time Memory , touch the Set Maximum Memory button and touch inside the Maximum
Sample Point field to enter a value using the scroll bar at the bottom of the window.
OR
Touch the Fixed Sample Rate button and touch inside the Sampling Rate field to enter a value using the
scroll bar at the bottom of the window.
3. Touch inside the Time/Division data entry field and set a time per division.
Note : If you are currently acquiring waveforms, you will notice a change in sampling rate as you select different
modes.
4. If you selected Sequence mode, touch inside the Num Segments data entry field and enter a value using
the pop-up numeric keypad. If you want to use a timeout period, touch the Enable Timeout checkbox; then
touch inside the Timeout data entry field and enter a value.
External Timebase vs. External Clock
An external timebase reference is used to synchronize the scope's internal timebase to an external frequency
source. This allows multiple instruments to lock their timebases to a common source. The external timebase
reference frequencies are model dependent. The WavePro 700Zi series uses an external timebase reference of
10 MHz ±0.01% with an amplitude of 650 mV
pk-pk
or 0.0 dBm ±30%.
An external sampling clock, applied via the auxiliary input, replaces the scope's internal timebase as the sampling
clock. This means that the external sampling clock controls when the scope's digitizers sample the input
waveforms. Since the external sampling clock uses the auxiliary input, an external trigger cannot be used when
the external sampling clock is in use.
Note : The WavePro 700Zi series has a timebase of 10 MHz ±0.01 and a clock of DC 100 MHz .