76 Chapter 3
Making Measurements
Tuned RF Level Measurement
Notes on the PSA Settings
Accuracy
Default is
Normal. When Accuracy is set to Normal, the standard deviation for the
measurement is 0.027 dB for the SNR is >30 dB, or 0.1 dB, when the SNR is <30
dB.
When the setting is
High, the standard deviation for the measurement is 0.027 dB
regardless of the SNR value.
Range 3 Switch Delay (Early instruments only)
Applies only to instruments with Option Driver part number E444060253 and
firmware release less than A.11.00. Press
System, More, Show Hardware to view
the option driver part number.
When range 3 is used, several internal PSA settings are changed including
enabling the optional preamp and decreasing input attenuation. For optimum
accuracy, a delay of several minutes is initiated when this function is
ON. The
delay allows the PSA circuitry to stabilize. Assure the
Range 3 Switch Delay is On
for both the Ranging Calibration and the TRFL measurement process since you
may perform the Ranging Calibration as a separate routine. However, many users
will take advantage of the fact the Ranging Calibration will be triggered
automatically (if the Range Switching is set to AUTO) as part of the TRFL
measurement routine. See “PSA Range Calibration” on page 56.
IF BW
Default is 10 Hz. Setting
IF BW to 10 Hz allows you to measure lower signal
levels but it cannot tolerate poor FM from the source. Setting the
IF BW to 75 Hz
offers better tolerance to residual FM, but the measurement range is reduced by
8.75 dB. The 30 kHz and 200 kHz settings can be used for analog sources.
Range Switching
Default is auto mode. In
Manual mode, you have to press the TRFL Calibrate key
to perform a range calibration. In
Auto mode, the TRFL Calibrate key is grayed out
and the N5531S performs the Range Calibration automatically depending on the
SNR.
10 MHz Out
(Under System, Reference)
ON
Freq Ref
(Under System, Reference)
Int
Table 3-2 PSA Settings
Parameter Setting
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