Keysight Truevolt Serie Mode D'emploi page 104

Math - Scaling
This topic describes dB/dBm Scaling for the 34465A/70A. Scaling features are dif-
ferent for the 34460A/61A and are described in the
Press the Scaling softkey to open the default dB scaling menu:
Press the Function softkey to select a scaling function:
Scaling is set to OFF when you change measurement functions (for example, changing from DCV
to ACV). You must re-enable scaling after changing measurement functions.
dB Scaling
Each dB measurement is the difference between the input signal and a stored reference value, with both
values converted to dBm:
dB = reading in dBm – reference value in dBm
The relative value must be from -200 to +200 dBm (default 0). You can either measure this value by press-
ing Measure Ref Value, or you can use the dB Ref Value softkey to specify a value.
dB scaling applies to ACV and DCV measurements only.
Keysight Truevolt Series Operating and Service Guide
Features and Functions
dB dBm Scaling Menus topic.
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