Keysight U8903B User Manual page 208

4 Audio Analyzer Measurement Functions
Table 4-13 Analog/Digital/Bluetooth Analyzer > Functions > THD Level menu description (continued)
Menu Description
Press the Format softkey to select the format of the returned measurement reading.
– Off
Selecting Off will return the measurement reading without any formatting (raw value).
– Logarithmic
Selecting Logarithmic will return the measurement result by using the following formula:
20
Format
The result is returned in unit dBr.
– Linear
Selecting Linear will return the measurement result by dividing the measured level by the reference level. The result is
returned in unit x.
– Delta
Selecting Delta will return the meausrement result by deducting the reference level from the measured level. The result
is returned in unit ΔV. This is only available for the analog analyzer.
This is only available for the analog analyzer.
Set to 0dB
Press the Set to 0dB softkey to store the measured level as the reference level, and set the measurement reading format to
Logarithmic.
Set resul t as ref. from Press the Set resul t as ref. from softkey to store the measurement result from the selected channel as the reference level.
Ref. Level Press the Ref. Level softkey to set the reference level value. There is only one reference level for each channel.
This is only available for the analog analyzer.
Ref. Imp
Press the Ref. Imp softkey to set the reference impedance value. This setting is only available if the unit is set to W and
dBm.
This is only available for the digital analyzer.
Vol t/FS
Press the Vol t/FS softkey to set the volts/FS reference value.
Cal SPL Press the Cal SPL softkey to set the calibrator level value. This setting is only available when the unit is set to dBSPL.
Press the Even Harmonic softkey to select the even harmonics.
– ALL
– 2
Even Harmonic
– 4
– 6
– 8
Press the Odd Harmonic softkey to select the odd harmonics.
– ALL
– 3
Odd Harmonic
– 5
– 7
– 9
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Measured rms voltage
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log 10
⎝ ⎠
Reference level
Keysight U8903B User's Guide