Operating instructions

GUIDE TO INSTALLATION AND OPERATION
FRS-1801 | 15
line, which corresponds to -31.76 μs. We can now determine that this switch will not be clean, because the
two sources are on opposite sides of the limit, and are therefore not in the same clean switch region.
Example 2: We have two SD (525) sources, one that indicates an offset of 50μs with respect to the reference
(A) and the other an offset of 40μs (B). We know that a clean switch region limit is present at + ½ line and
another one at ½ line plus one line. These correspond to 31.76μs and 95.28μs. We can now determine that
this switch will be clean, because the two sources are inside the same clean switch region.
Freeze tab
Freeze type: This is a pull-down menu with four
options – FIELD 1, FIELD 2, FRAME and BLACK. It
determines the manner in which the FRS-1801
responds to a manual freeze, a video input switch
(“hotswitch” as defined by SMPTE recommended
practice RP-168, revised January 2002), a loss of
input signal or other input errors. The four possible
options yield the following results:
Figure 3.5 Input panel – Freeze tab