October 2009
©2009 Fluke Corporation. All rights reserved.
All product names are trademarks of their respective companies.
FIBER OneShot™
Length Meter
Quick Reference Guide 
Safety Information
WWarning: Class 1 Laser*
To prevent possible damage to your eyes caused by 
hazardous radiation:
•
Do not look directly into optical connectors. Some optical 
equipment emits invisible radiation that can cause 
permanent damage to your eyes.
•
Do not turn on the meter unless a fiber is attached to the 
port.
•
Do not use a magnifying device to look at the optical 
outputs without the correct filter.
•
Use of controls, adjustments, or procedures that are not in 
this manual can cause exposure to hazardous radiation.
WCaution
To prevent damage to fiber connectors, to prevent data 
loss, and to make sure that your test results are as accurate 
as possible:
•
Do not connect APC connectors to the meter. An APC 
connector will cause damage to the fiber endface in the 
connector on the meter. 
•
Use only patch cords that comply with GR-326-CORE 
specifications. Other patch cords can cause unreliable 
measurements.
•
Use the correct procedures to clean all fiber connectors 
before each test. If you do not do this or if you use 
incorrect procedures, you can get unreliable test results 
and can cause permanent damage to the connectors. 
•
Put protective caps on all connectors when you do not use 
them.
•
Do not connect the meter to a network that is on. If you 
do, the meter can cause problems in the network.
•
If ACTIVE LINE blinks, immediately disconnect the meter 
from the fiber. Optical power levels more than +7 dBm can 
cause damage to the detector in the meter.
Battery Installation and Life
fjy03.eps
How to Install the Batteries
The meter can do approximately 1500 tests before you must replace 
the batteries.
Display Features
fjy01.eps
A
CheckActive™shows when the meter looks for an optical signal 
on the fiber. CheckActive™and ACTIVE LINE blink if there is an 
optical signal on the fiber. The meter will not do a test if there 
is an optical signal on the fiber.
B
When the low battery symbol shows, replace the batteries 
soon.
C
The digits show the fiber length in feet or meters. 
D
Shows when you look at the setting for the backlight timer. 
The setting is in seconds.
E
Shows an error number for error conditions.
F
Shows when the meter completes a length measurement. 
G
Shows as the meter measures length.
H
J: Shows when the length is more than the range of the 
meter. 
I: Can show for short fibers when the meter cannot measure 
the length accurately.
I
Settings for the meter. 
Settings
To change the settings on the meter:
1
Press M.
2
To select a setting to change, press V, then press M. 
3
Use UVto change the setting. See below for information on 
the settings.
4
Press Mor Tto save the setting.
•
APC/UPC: Angled Physical Contact/Ultra Physical Contact. If most 
cables you will do tests on have UPC connectors, set this to UPC. 
•
BACKLIGHT: Timer for the display backlight.
•
I.O.R.: Index of refraction.
•
ft/m: Unit for length measurements.
•
dB LIMIT: Sets the minimum size of a reflection that the meter 
shows as a break or the end of the fiber when the reflection is 
before the end of the fiber.
How to Clean the Connector on the Meter
1
Turn off the meter.
2
Remove the connector adapter to get access to the ferrule (see 
"The Connector Adapter".)
3
Touch the tip of an optical-grade solvent pen or swab soaked in 
solvent to a dry, optical-grade wiper.
4
Touch a new, dry swab to the solvent on the wiper. 
5
Twist the swab around against the fiber endface 3 to 5 times, 
then twist a dry swab around against the fiber endface 3 to 5 
times.
AA
IEC LR6
NEDA 15A
Note: Fluke Networks recommends alkaline batteries.