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For power levels greater than 0 dBm, add 0�5%/dB to the calibration factor uncertainty specification
E-Series CW Power Sensor Specifications (Continued)
Calibration factor (CF) and
reflection coefficient (Rho)
Calibration factor and reflection
coefficient data are provided at 1 GHz
increments on a data sheet included with
the power sensor� This data is unique
to each sensor� If you have more than
one sensor, match the serial number on
the data sheet with the serial number
on the power sensor you are using� The
CF corrects for the frequency response
of the sensor� The EPM power meter
automatically reads the CF data stored
in the sensor and uses it to make the
corrections�
Reflection coefficient (Rho) relates to the
SWR according to the following formula:
SWR = 1 + Rho/1 – Rho�
Maximum uncertainties of the CF data are
listed in Table 5a, for the E4412A power
sensor, and Table 5b for the E4413A power
sensor� The uncertainty analysis for the
calibration of the sensors was done in
accordance with the ISO/TAG4 Guide�
The uncertainty data reported on the
calibration certificate is the expanded
uncertainty with a 95% confidence level
and a coverage factor of 2�
Table 5a. E4412A calibration factor uncertainty at calibrated powers.
Frequency
Uncertainty
1
(%)
50 MHz
Reference
10 to < 30 MHz
1.8
30 MHz to < 2 GHz
1.8
2 to < 16 GHz
2.4
16 to 18 GHz
2.6
Table 5b. E4413A calibration factor uncertainty at calibrated powers.
Frequency
Uncertainty
1
(%)
50 MHz
Reference
100 MHz to < 2 GHz
1.8
2 to < 10 GHz
2.4
10 to < 12 GHz
2.6
12 to < 20 GHz
2.8
20 to 26.5 GHz
3.0
1� For power levels greater than 0 dBm, add 0�5%/dB to the calibration factor uncertainty specification
