b.
Rng:
This option selects the demi-arc to be traced by specifying the DGD range.
Two DGD values are shown on this line. The first DGD value listed is the
endpoint on the DGD axis. Use the left and right arrow keys to select the
digit to be changed, and the up and down arrow keys to increment the
active digit. The range for this value is 0.00 to 91.04 ps for a 90-ps
PMDPro and 0.36 to 182.4 ps for a 180-ps PMDPro. As the DGD axis
endpoint is changed, the other endpoint is adjusted accordingly. Note that
the second endpoint is not on the DGD axis; while only its DGD value is
displayed on this screen, it does have a nonzero SOPMD. Use the ENTER
key to select the displayed DGD range.
c.
STEP DIRECTION:
This option determines the beginning point and direction of the scan.
UP: scan begins at the lower DGD endpoint and proceeds in the
direction of increasing DGD
DN: scan begins at the higher DGD endpoint and proceeds in the
direction of decreasing DGD.
Use the up and down arrows to toggle the direction and the ENTER key to
select the displayed setting.
d.
CYCLES:
This option sets the number of times to run the scan. The cycle number
range is 1-9999. Use the left and right arrows to move between digits and
the up and down arrows to increment the selected digit. The ENTER key
sets the number of cycles to the displayed value.
e.
MODE:
This option determines whether one cycle is defined as a single direction
or round-trip scan.
BI-Direc:
Round-trip scan. The scan begins at the beginning point
specified in option c), proceeds to the endpoint, then scans
back to the beginning point.
UNI-Direc: Single-trip scan. The scan begins at the beginning point
specified in option c), scans to the endpoint, and stops. The
PMDPro then jumps back to the beginning point to begin
the next cycle.
Use the up and down arrows to toggle between unidirectional and
bidirectional, and the ENTER key to select the displayed setting
f.
CON RATE:
Set the DGD variation rate, in ps/s, for the scan. Use the left and right
arrows to move between digits and the up and down arrows to increment
the selected digit. The variation rate range is 0.1 to 100 ps/s. The ENTER
key selects the displayed value.
Document #: GP-UM-PMD-1000-21
Page 23 of 122
