Agilent Technologies E4418B - Measurement Noise; Table 5-2 Noise Multiplier; Table 5-3 Power Sensor Specifications

5 Specifications
162 E4418B Power Meter User’s Guide
Measurement Noise
Power sensor dependent (refer to Table 5- 2 and Table 5- 3).
Averaging effects on measurement noise. Averaging over 1 to 1024
readings is available for reducing noise.
Table 5- 3 provides the
measurement noise for a particular power sensor with the number of
averages set to 16 for normal mode and 32 for x2 mode. Use the “Noise
Multiplier” for the appropriate mode (normal or x2) and number of
averages to determine the total measurement noise value.
For example, for an Agilent 8481D power sensor in normal mode with the
number of averages set to 4, the measurement noise is equal to:
(<45 pW x 2.75) = <124 pW
Tab l e 5 - 2 Noise Multiplier
Tab l e 5 - 3 Power Sensor Specifications±
Number of Averages 1 2 4 8 16 32 64 128 256 512 1024
Noise Multiplier
(Normal Mode)
5.5 3.89 2.75 1.94 1.0 0.85 0.61 0.49 0.34 0.24 0.17
Noise Multiplier
(x2 mode)
6.5 4.6 3.25 2.3 1.63 1.0 0.72 0.57 0.41 0.29 0.2
Power Sensor Zero Drift
1
Measurement Noise
2
Agilent 8481A
3
<±10 nW <110 nW
Agilent 8481B
3
<±10 mW <110 mW
Agilent 8481D
3
<±4 pW <45 pW
Agilent 8481H
3
<±1 mW <10 mW
Agilent 8482A
3
<±10 nW <110 nW
Agilent 8482B
3
<±10 mW <110 mW
Agilent 8482H
3
<±1 mW <10 mW
Agilent 8483A
3
<±10 nW <110 nW
Agilent 8485A
3
<±10 nW <110 nW
Agilent 8485D
3
<±4 pW <45 pW
Agilent R8486A
3
<±10 nW <110 nW