Atec Agilent-N5171B - Manual (Page 8)

8
0 20 40 60 80 100 120
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
Elapsed time (minutes)
Delta from initial (dB)
Measured amplitude repeatablity +5 dBm ALC on
850 MHz
1900 MHz
2200 MHz
3500 MHz
5800 MHz
Relative level accuracy measures the accuracy of a step
change from any power level to any other power level. This is
useful for large changes (such as 5 dB steps).
Repeatability measures the ability of the instrument to return
to a given power setting after a random excursion to any other
frequency and power setting. It should not be confused with
absolute level accuracy.
Measured relative level accuracy
at 850 MHz initial power +10 dBm
Final power (dBm)
Power error (dB)
0 –20 –40 -60 –80 –100 –120 –140
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
Upper std dev (1 σ)
Mean
Lower std dev (1 σ)
Measured ALC linearity
1900 MHz, CW, relative to 0 dBm
Amplitude (dB)
–20 –15 –10 –5 0 5 10
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
Error (dB)
Upper std dev (1 σ)
Mean
Lower std dev (1 σ )
Measured ALC linearity
850 MHz, CW, relative to 0 dBm
Amplitude (dB)
–20 –15 –10 –5 0 5 10
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
Error (dB)
Upper std dev (1 σ)
Mean
Lower std dev (1 σ)