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Transmission measurement accuracy

Transmission loss or gain measurements are made

relative to a 0 dB reference point established at

calibration.

Transmission measurement uncertainty =

dynamic power accuracy + mismatch uncertainty

Dynamic power accuracy is the measurement uncer-

tainty due to the change in power level between cali-

bration and the measurement. Mismatch uncertainty

is the uncertainty due to reflections in the measure-

ment setup. The frequency response errors of the

source, detectors, bridge, and power splitter are

removed via calibration.

Transmission measurement uncertainty examples

Assumptions:

• Measurement frequency = 10 GHz

• DUT input/output SWR = 1.5

• Ratio measurement

Change in power after calibration

<30 dB (+0 to –30 dBm range)

85037B 85025E

Uncertainty component precision detector detector

Dynamic accuracy (±dB) 0.11 0.40

Mismatch (±dB) 0.45 0.33

Total (±dB) 0.56 0.73

Change in power after calibration

60 dB (+6 to –55 dBm range)

85037B 85025E

Uncertainty component precision detector detector

Dynamic accuracy (±dB) 0.96 2.00

Mismatch (±dB) 0.45 0.33

Total (±dB) 1.41 2.33

Absolute power measurement accuracy

This specification is useful for determining the

accuracy of power measurements in dBm when

using the Agilent 85037 series precision detectors

or the 85025 series detectors in DC mode.

Absolute power uncertainty =

absolute power accuracy at 50 MHz + frequency

response + mismatch uncertainty

Absolute power measurement uncertainty examples

Assumptions:

• Measurement frequency = 10 GHz

• DUT input/output SWR = 1.5

Power = +10 dBm

85037B 85025E

Uncertainty component precision detector detector

Absolute power accuracy

at 50 MHz (±dB) 0.11 0.50

Frequency response (±dB) 0.18 0.50

Mismatch (±dB) 0.18 0.10

Total (±dB) 0.47 1.10

Power = 0 dBm

85037B 85025E

Uncertainty component precision detector detector

Absolute power accuracy

at 50 MHz (±dB) 0.11 0.40

Frequency response (±dB) 0.18 0.50

Mismatch (±dB) 0.18 0.10

Total (±dB) 0.47 1.00

Power = 50 dBm

85037B 85025E

Uncertainty component precision detector detector

Absolute power accuracy

at 50 MHz (±dB) 0.85 1.30

Frequency response (±dB) 0.18 0.50

Mismatch (±dB) 0.18 0.10

Total (±dB) 1.21 1.90

System accuracy

1 2 3 4 5 6 7 8 9 10 11 12 13 14

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