General – Atec Agilent-E9300A User Manual

Page 10

The chart in figure 1 shows the typi-
cal uncertainty in making a relative
power measurement, using the same
power meter channel and the same
power sensor to obtain the reference
and the measured values. Example A
illustrates a relative gain (amplifier
measurement). Example B illustrates
a relative loss (insertion loss mea-
surement). This chart assumes negli-
gible change in frequency and mis-
match occur when transitioning
from the power level used as the
reference to the power level being
measured.

Example A:
P = 10(P)/10 x 1 mW
P = 10 6/10 x 1 mW
P = 3.98 mW
3% x 3.98 mW = 119.4 µW
(where P = power in Watts,
and (P) = power in dBm)

Example B:
P = 10 (P)/10 x1 mW
P = 10 -35/10 x 1 mW
P = 316 nW
3% x 316 nW = 9.48 nW

General

Dimensions:

E4412A:
130 mm L x 38 mm W x 30 mm H
(5.1 in x 1.5 in x 1.2 in)
E4413A:
102 mm L x 38 mm W x 30 mm H
(4 in x 1.5 in x 1.2 in)

Weight:

E4412A: 0.18 kg (0.4 lb).
E4413A: 0.18 kg (0.4 lb).

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 cor-
rects 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. For power lev-
els greater than 0 dBm, add 0.5%/dB
to the calibration factor uncertainty
specification.

Reflection coefficient (Rho) relates
to the SWR according to the follow-
ing formula: SWR = 1 + Rho/1 - Rho

Maximum uncertainties of the CF
data are listed in table 8a, for the
E4412A power sensor, and table 8b
for the E4413A power sensor. The
uncertainty analysis for the calibra-
tion of the sensors was done in
accordance with the ISO/TAG4
Guide. The uncertainty data report-
ed on the calibration certificate is
the expanded uncertainty with a
95% confidence level and a coverage
factor of 2.

Table 8a. E4412A calibration factor uncertainty
at 1 mW (0 dBm)

Frequency Uncertainty

(%)

10 MHz

1.8

30 MHz

1.8

50 MHz

Reference

100 MHz

1.8

1.0 GHz

1.8

2.0 GHz

2.4

4.0 GHz

2.4

6.0 GHz

2.4

8.0 GHz

2.4

10.0 GHz

2.4

11.0 GHz

2.4

12.0 GHz

2.4

14.0 GHz

2.4

16.0 GHz

2.6

18.0 GHz

2.6

Table 8b. E4413A calibration factor uncertainty
at 1 mW (0 dBm)