67
Power Measurement
How to Measure Power
P
input
is the input signal level , and
CAL
is the calibration offset.
To set the calibration offset to 40.000 dB:
1
Move to the Power Meter channel and press the [Details]
softkey.
2
Move to the [C
AL
] parameter and press E
NTER
.
3
Enter 40.000 and press E
NTER
.
How to Set the Reference Level
How to Input a Reference Level
dB results are shown relative to a reference level. The Ref
parameter sets the reference level. Setting, or changing, the
reference only affects results that are displayed in dB.
The reference level is displayed in units of dBm or Watts.
Depending on which is selected the following equations are used to
calculate the power level in dB:
P
display
(dB) = P
measured
(dBm)
−
REF(dBm)
or
Where,
P
display
is the displayed relative power,
P
measured
is the absolute power level (see “How to Set the
Calibration Offset” on page 66), and
REF
is the reference level.
You can choose the units for the reference using the Power Unit
softkey. If you choose dB, the power value changes to dB and the
displayed reference level changes to dBm.
P
display
dB
(
)
10
P
measured
W
( )
REF W
( )
-----------------------------------
log
=
Содержание 8163A Series
Страница 1: ...HP 8163A Lightwave Multimeter HP 8164A Lightwave Measurement System User s Guide ...
Страница 3: ...HP 8163A Lightwave Multimeter HP 8164A Lightwave Measurement System User s Guide ...
Страница 13: ...13 Safety Summary ...
Страница 25: ...1 1 Getting Started ...
Страница 40: ...40 Getting Started A Description of the User Interface Figure 1 13 The HP 8163A System Configuration Menu ...
Страница 49: ...2 2 Additional Features ...
Страница 61: ...3 3 Power Measurement ...
Страница 76: ...76 Power Measurement How to Measure Power Figure 3 8 Manual Range Mode Within Range ...
Страница 87: ...4 4 Laser Sources ...
Страница 94: ...94 Using Laser Source Modules How to Use Laser Source Modules ...
Страница 95: ...5 5 Tunable Lasers ...
Страница 99: ...99 Tunable Laser Sources How to Set the Power Figure 5 1 Setting High Power parameters ...
Страница 103: ...103 Tunable Laser Sources How to Set the Power Figure 5 3 Setting Attenuation ...
Страница 113: ...113 Tunable Laser Sources How to Perform a Wavelength Sweep Figure 5 10 Executing a Stepped Sweep ...
Страница 130: ...130 Tunable Laser Sources How to Use Auxiliary Functions ...
Страница 131: ...A A Installation and Maintenance ...
Страница 159: ...B B Accessories ...
Страница 167: ...C C Specifications ...
Страница 175: ...D D Performance Tests ...
Страница 188: ...188 Performance Tests Test Record ...
Страница 192: ...192 Performance Tests Test Record ...
Страница 193: ...E E Cleaning Procedures ...
Страница 199: ...F F Firmware Updates ...
Страница 204: ...204 F Firmware Updates Firmware Update Process ...