AUTOTEST λ RESTRICTION
KI23400/KI27400 UM-2
-
36 -
Autotest
λ
Restriction
Once you are familiar with these instruments, particularly if the
instrument has more than two
λ
, you might want to restrict the number
of active
λ
in a test, for a few reasons:
•
With restricted
λ
, pass / fail can be more meaningful.
•
Pre-set instruments off-site, for lower skill operation on-site.
•
Faster test time. For example, if testing SM fiber on a SM/MM
capable instrument, there is no point in the instrument cycling
through the MM
λ
. (use Method 1)
•
For example, an instrument that can test 1310 / 1550 / 1625 nm,
but you only want to test at 1310 / 1550 nm (use Method 2)
•
You want to test at just one
λ
, e.g. 850 nm (use Method 2)
There are two different ways
λ
restriction can be achieved. Method 1
is easier and usually suited to choosing between multimode / single
mode. Method 2 selects λ in more detail.
Method 1
(easy, for instrument with 2 light source ports only)
•
This selects from an upper bank (e.g. single mode) or lower bank
(e.g. multimode) groups on a SM & MM capable unit.
For example, on a Quad
λ
instrument, select between a 1310 /
1550 nm SM group, or 850 / 1300 nm MM group.
•
To test with the lower bank / MM group only: Press + and [Auto]
(
F4
) together.
•
To test with the upper bank / SM group only: Press - and [Auto]
(
F4
) together.
Method 2 (more control)
•
This selects any individual test
λ
.
Put the instrument into [Source] mode, then:
•
To check if a
λ
is selected for limited
λ
Autotest, press & hold
F4
while source is on.
Either “in” (on) or “out” (off) is displayed.
•
To toggle selection of
λ
for limited
λ
Autotest, while continuing
to hold down
F4
, press
Toggle Centre
to change between “in”
or “out”
.
For example, on a Quad
λ
instrument, select to test at just 850
nm:
•
So,
in the example Quad instrument, 850 nm would be “in” and
1300, 1310, 1550 nm would be selected as
“out”.
•
To start limited
λ
Autotest, press and hold
Toggle Centre
,
while pressing button below [AUTO] (
F4
).
