RIGOL
2-138
DG900 Programming Guide
[:SOURce[<n>]]:VOLTage:UNIT
Syntax
[:SOURce[<n>]]:VOLTage:UNIT {VPP|VRMS|DBM}
[:SOURce[<n>]]:VOLTage:UNIT?
Description
Sets the amplitude unit of the specified channel to Vpp (VPP), Vrms (VRMS), or dBm (DBM).
Queries the amplitude unit of the specified channel.
Parameter
Name
Type
Range
Default
[<n>]
Discrete
1|2
1
{VPP|VRMS|DBM}
Discrete
VPP|VRMS|DBM
VPP
Remarks
When [:SOURce[<n>]] or [<n>] is omitted, the system sets the related parameters of CH1 by default.
Vpp is the unit for signal peak-peak value; Vrms is the unit for root-mean-square value; and dBm is the
unit of the absolute power value of the signal. For different waveforms, the relation between Vpp and
Vrms is different.
Take Sine as an example. The conversion relations between
Vpp
and
Vrms
fulfills the equation
Vrms
Vpp
2
2
=
.
dBm
and
Vrms
fulfills the equation
)
001
.
0
1
lg(
10
2
W
R
Vrms
dBm
×
=
.
Wherein,
R
represents the channel output impedance value and it must be a specific value, so the
unit dBm is not available when the output impedance is "HighZ".
Return Format
The query returns VPP, VRMS, or DBM.
Example
:SOUR1:VOLT:UNIT VPP /*Sets the amplitude unit of CH1 to Vpp.*/
:SOUR1:VOLT:UNIT? /*Queries the amplitude unit of CH1 and the query returns VPP.*/
Summary of Contents for DG952
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