SIGLENT SSA5083A, Руководство пользователя, Страница: 144 / 260

114
User Manual
Return
Float
，
unitdB
Example :DISPlay:WINDow:TRACe:Y:PDIVision 10 dB
4.4.5 Unit
The unit can be dBm, dBmV, dBuV, Volts and Watts. The default unit is dBm.
The conversion between units is as follows:
dBm = 10lg⁡ (
Volts
2
R
×
1
1mW
)
dBμV = 20lg⁡ (
Volts
1μV
)
dBmV = 20lg⁡ (
Volts
1mV
)
Watts =
Volts
2
R
Where R represents the input impedance, the default is 50 ohms.
The impedance selection here only represents the numerical calculation, and does not represent
the switching of the actual impedance. After switching the input impedance, the display of the
power class units will not change, and the amplitude and energy class units will change
accordingly.
Command format :UNIT:POWer DBM|DBMV|DBUV|V|W
:UNIT:POWer?
Instructions Sets/gets the display unit of magnitude
Parameter type Enumeration
Parameter Range DBM|DBMV|DBUV|DBUA|V|W
Return Enumeration
：
DBM|DBMV|DBUV|V|W
Example :UNIT:POWer DBMV