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Fiber Optic Test Meters • Operation 7
Ref/Set Button
The Ref/Set button,
Ref
, provides two functions:
• Press and hold to store the power level values for a set of reference cables, (Set),
• Press and release to display previously stored references, (Ref).
Test Mode: To Set a Reference
1. Refer to the sections describing connection of reference cables (see “Testing Fiber
Optic Links” on page 12).
2. Set the FPM 101 to the desired measurement mode (dBm or uW) (see “dB/dBm/μW
Button” in the previous section).
3. To store the currently measured level or multiple levels (in dual WAVE ID mode) as the
new reference level, press and hold the Ref/Set button until HELD SET is displayed.
4. Once the new reference is set, the FPM 101 switches to insertion loss (dB) mode.
NOTE: When setting references from dual WAVE ID sources, additional time is
required for the power meter to identify and measure both wavelengths. Allow
several seconds before pressing the Ref/Set button in step 3.
Test Mode: To View the Reference
1. Press the Ref/Set button to display the stored reference wavelength and power level
for the currently selected wavelength or detected WAVE ID wavelengths. The reference
indicator (
a
, below) lights, and the reference values are displayed briefly (several
seconds) as follows:
WAVE ID
nm
µW
Hz
nm
dB dBm
µW
dB dBm
WAVE ID
nm
µW
nm
dB dBm
µW
dB dBm
Single WAVE mode, or
Tri WAVE mode - second page
Single and Dual WAVE ID mode
REF
REF
C
D
dBm
nm
nm
dBm
dBm
nm
D
E
C
Continuous Wave (CW) mode — The reference wavelength and power level are
displayed at
b
Single WAVE ID mode — The reference wavelength and power level are displayed
at
b
Dual WAVE ID mode — The first reference wavelength and power level are displayed
at
b
,and the second at
c
.
Splash and Auto-Off Screen
Splash (Version) Screen — During power up, the FPM 101
software version is shown on the top line, (
d
). The FPM 101
type and detector type are shown on the next line (
e
). The
splash screen is replaced by the normal display after about
two seconds.
Auto-off Screen — When the unit is about to power down
due to inactivity, the display shows OFF for a brief time on
line
e
, then counts down the number of seconds until power
is shut off.
WAVE ID
nm
µW
Hz
nm
dB dBm
µW
dB dBm
REF
G
F