SDA Operator’s Manual
Edge-to-Edge Basic Setup
The ASDA-J option adds a second measurement mode defined as edge-to-edge. In this mode, all
jitter measurements are made between adjacent edges of the data pattern and no reference clock
is used. Only jitter measurements are available in this mode, so the mask test, bit error rate, and
summary buttons are inactive when the Edge-Edge mode is selected.
1. Touch inside the Data Source field and select a data source.
2. The “Crossing Level(s)” section in this dialog allows you to set the voltage level at which the
signal timing is measured. It can be set to either absolute or percent. The absolute crossing
level — in volts (or watts for an optical signal) — can be set directly or can be automatically
found by touching the Find Data Level button. This level is determined by locating the
midpoint between the highest and lowest signal levels in the current acquisition. The percent
level is automatically set to the selected percentage on each acquisition.
3. If you selected absolute, touch inside the Abs level field and enter a voltage value.
Alternatively, you can touch the Find Data Level or Find Clock Level button. If you selected
Percent, touch inside the Percent level field and enter a percentage value, using the pop-up
keypad. The level is automatically set to the selected percentage on each acquisition.
Note: The absolute level setting should be used for jitter measurements over several acquisitions because the relative
setting can potentially remove jitter by tracking slowly, thereby varying level shifts that could occur between acquisitions.
4. Touch inside the Signal Type field and select a standard signal type from the pop-up menu.
The signal type defines the bit rates for the selected standard.
5. If you selected Custom from the Signal Type menu, touch inside the Bit Rate field and enter
a bit rate, using the pop-up keypad. By touching the Find Bit Rate button, you can have the
bit rate determined automatically. This button is also available when a standard data type is
selected.
SDA-OM-E Rev H 341
To Next Page
Loading...
Need help?
General