Anritsu AWGN MU368060A - Manual (Page 24)

Section 3 Operation Overview
3-6.
3.2 Power Accuracy for the Calculated Bandwidth
From Formula (1) in Section 3.1, accuracy for the power within the calcu-
lated bandwidth varies depending on the accuracy for the RF output level
and the power calculation level. When the user does not perform calibra-
tion, accuracy is the added value of these two error elements.
Accuracy of the power within the calculated bandwidth
= RF output level error + Calculated level error .................(2)
= (Level accuracy at CW ± 3.0 dB) + (± 0.6 dB or ± 2.0 dB)* ....(3)
*: ±0.6 dB when the setting value for noise bandwidth
is ≤8 MHz.
±2.0 dB when the setting value for noise bandwidth
is >8 MHz.
• RF output level accuracy
The standard for the RF output level accuracy is ±3 dB level accuracy at
CW. However, it is relatively easy to calibrate it by using the power
meter. When calibrated, the error for the RF output level can be
reduced to the measurement accuracy of the power meter.
• Calculated level accuracy
The calculated level displayed is figured out under ideal conditions and
with the frequency characteristic for the analogue circuit flat. On the
other hand, the actual RF output signal may not be flat according to the
frequency characteristic for the analogue circuit. The distortion of
frequency characteristic results in an error in the calculated level.
Spectrum for MU368060A
Setting value for the noise bandwidth
Carrier frequency
Setting value for the
calculated bandwidth
Level range