Atec Agilent-E9320 Series - Manual (Page 9)

9
Peak flatness
The peak flatness is the flatness of a peak-to-average ratio
measurement for various tone-separations for an equal
magnitude two-tone RF input. Figures 6, 7 and 8 refer to
the relative error in peak-to-average measurement as the
tone separation is varied. The measurements were per-
formed at –10 dBm average power using an E9288A sensor
cable (1.5 m).
Calibration Factor (CF) and
Reflection Coefficient (Rho)
Calibration Factor and Reflection Coefficient data are pro-
vided at frequency intervals 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 of the power sensor
you are using. The CF corrects for the frequency response
of the sensor. The EPM-P series power meter automatically
reads the CF data stored in the sensor and uses it to make
corrections.
For power levels greater than 0 dBm, add to the calibra-
tion factor uncertainty specification:
±0.1%/dB (for E9321A and E9325A sensors),
±0.15%/dB (for E9322A and E9326A sensors) and
±0.2%/dB (for E9323A and E9327A sensors).
Reflection Coefficient (Rho) relates to the SWR according
to the formula:
SWR = (1 + Rho) / (1 – Rho)
Maximum uncertainties of the CF data are listed in Table 7.
The uncertainty analysis for the calibration of the sensors
was done in accordance with the ISO Guide. The uncer-
tainty data, reported on the calibration certificate, is the
expanded uncertainty with a 95% confidence level and a
coverage factor of 2. Figure 6. E9321A and E9325A Error in peak-to-average measurements for a
two-tone input (high, medium, low and off filters).
Figure 7. E9322A and E9326A error in peak-to-average measurements for a
two-tone input (high, medium, low and off filters).
Figure 8. E9323A and E9327A error in peak-to-average measurements for a
two-tone input (high, medium, low and off filters).
Table 7. Calibration factor uncertainty at 0.1 mW (-10 dBm).
Frequency
50 MHz
100 MHz
300 MHz
500 MHz
800 MHz
1.0 GHz
1.2 GHz
1.5 GHz
2.0 GHz
3.0 GHz
4.0 GHz
5.0 GHz
6.0 GHz
7.0 GHz
8.0 GHz
9.0 GHz
10.0 GHz
11.0 GHz
12.0 GHz
12.4 GHz
13.0 GHz
14.0 GHz
15.0 GHz
16.0 GHz
17.0 GHz
18.0 GHz
Uncertainty (%)
(25 ±10°C)
Reference
±1.8
±1.8
±1.8
±1.8
±2.1
±2.1
±2.1
±2.1
±2.1
±2.1
±2.1
±2.1
±2.3
±2.3
±2.3
±2.3
±2.3
±2.3
±2.3
±2.3
±2.5
±2.5
±2.5
±2.5
±2.5
Uncertainty (%)
(0 to 55°C)
Reference
±2.0
±2.0
±2.0
±2.0
±2.3
±2.3
±2.3
±2.3
±2.3
±2.3
±2.3
±2.3
±2.5
±2.5
±2.5
±2.5
±2.5
±2.5
±2.5
±2.5
±2.8
±2.8
±2.8
±2.8
±2.8