EXFO PM-1600 High-Speed Power Meter - Manual (Page 21)

Getting Started with Your High-Speed Power Meter
High-Speed Power Meter 11
Nulling Electrical Offsets
Note: The PM-1600 will beep whenever the unit does not allow an operation.
Note: In this manual, the single-channel power meter is referred to as the
PM-1610 and the dual-channel power meter as the PM-1620.
Nulling Electrical Offsets
The Offset Nulling function provides a zero power measurement, thus
eliminating the effects of electronic dark current. For best results and
accuracy, ensure that offsets are nulled before each test session, each time
the unit is turned on, or whenever environmental conditions change while
the power meter is operating (temperature and humidity variations affect
the performance of optical detectors).
To perform a nulling,
1. Place the protective cap over the detector port on which a nulling has
to be performed.
I
MPORTANT
Light must not reach the detector when nulling offsets.
When the PM-1600 is turned on after a cold start, allow the unit to
warm up for about 20 minutes (30 minutes for PM-1600W) until the
electronics stabilize and can meet announced optical specifications.
1 AUTO
λ
1310.00 nm
- - - - - - -
dBm
2 LR4 CF
1550.00 nm
1.26
W/W
SH
λ
Getting Started with Your High-Speed Power Meter
High-Speed Power Meter 11
Nulling Electrical Offsets
Note: The PM-1600 will beep whenever the unit does not allow an operation.
Note: In this manual, the single-channel power meter is referred to as the
PM-1610 and the dual-channel power meter as the PM-1620.
Nulling Electrical Offsets
The Offset Nulling function provides a zero power measurement, thus
eliminating the effects of electronic dark current. For best results and
accuracy, ensure that offsets are nulled before each test session, each time
the unit is turned on, or whenever environmental conditions change while
the power meter is operating (temperature and humidity variations affect
the performance of optical detectors).
To perform a nulling,
1. Place the protective cap over the detector port on which a nulling has
to be performed.
I
MPORTANT
Light must not reach the detector when nulling offsets.
When the PM-1600 is turned on after a cold start, allow the unit to
warm up for about 20 minutes (30 minutes for PM-1600W) until the
electronics stabilize and can meet announced optical specifications.
1 AUTO
λ
1310.00 nm
- - - - - - -
dBm
2 LR4 CF
1550.00 nm
1.26
W/W
SH
λ