Atec Agilent-8703A - Manual (Page 12)

Measurement uncertainty
Transmission test (S21) 36
Reflection test (S11) 37
Microwave measurement accuracy for the 8703A analyzer
is presented in the following graphs and tables. All data is
taken after an 8703A accuracy enhancement using the
calibration type shown. This analysis accounts for the
following errors
33 :
• Residual systematic errors (Table 7)
• System dynamic accuracy (dB from reference)
34
• 3.5 mm connector repeatability
• Switch repeatability
35
• Noise
A 10 Hz IF bandwidth, a 16 averaging factor and a
23 ±3°C temperature range are used in all cases.
Microwave transmission
and reflection
Measurement setup
Calibration type: full 2-port & isolation
Calibration Standards: Agilent 85052D RF calibration kit
Connectors and cables: 3.5 mm RF connectors
85131E RF cable
The following table shows 8703A residual systematic errors
after accuracy enhancement using the same calibration and
setup as for the microwave measurements below.
Table 7. Residual
microwave
measurement
systematic errors.
Frequency range (GHz)
0.13 to 0.5 0.5 to 2 2 to 8 8 to 20
Directivity 40 dB 40 dB 38 dB 36 dB
Source port return loss 38 30 dB 30 dB 30 dB 29 dB
Receiver port return loss 38 35 dB 35 dB 30 dB 30 dB
Reflection tracking 39 ±0.10 dB ±0.10 dB ±0.10 dB ±0.20 dB
Transmission tracking 39 ±0.10 dB 40 ±0.10 dB 40 ±0.12 dB ±0.15 dB
Magnitude Phase
Magnitude Phase
33 Additional technical information about microwave measurement
error analysis and calibration is available upon request from an
Agilent Technologies representative.
34 Crosstalk effects are included in dynamic range and dynamic
accuracy specification.
35 Cable stability and system drift are not included.
36 The graphs for transmission measurements assume a well-matched
device (S11 = S22 = 0).
37 The graphs shown for reflection measurement uncertainty apply to
a one-port device.
38 Before calibration accuracy enhancement the source match is 10 dB
return loss and the receiver is 12 dB return loss.
39 Tracking includes switch repeatability, temperature stability and
frequency response.
40 Reverse transmission tracking (S12) is ±0.25 dB from 0.13 to
0.5 GHz, and ±0.15 dB from 0.5 to 2.0 GHz.
12
Microwave measurement
accuracy summary