786
QPSK EVM Measurement
AMPTD Y Scale
Internal Preamp
Accesses a menu of functions that enable you to control the internal preamplifiers.
See “Internal Preamp” on page 883 for more information.This is only available when the selected input is RF.
Ref Position
Positions the Y-axis scale reference level at the top, center or bottom of the display. Changing the reference position does not change the reference level value. This function can be used for all three QPSK EVM measurement results graphs.
Couplings When the Auto Scaling is On, this value is automatically determined by the
measurement result.
When the user sets a value manually, Auto Scaling automatically changes to
Off.
Preset 0.5
State Saved Saved in instrument state.
Min 0.1
Max 50
Instrument S/W Revision Prior to A.02.00
Key Path AMPTD Y Scale
Initial S/W Revision Prior to A.02.00
Remote Command :DISPlay:EVMQpsk:VIEW2:WINDow[1]|2|3:TRACe:Y[:SCALe] :RP
OSition TOP|CENTer|BOTTom
:DISPlay:EVMQpsk:VIEW2:WINDow[1]|2|3:TRACe:Y[:SCALe]:RP
OSition?
Example DISP:EVMQ:VIEW2:WIND3:TRAC:Y:RPOS TOP
DISP:EVMQ:VIEW2:WIND3:TRAC:Y:RPOS?
Key Path AMPTD Y Scale
Mode WCDMA, C2K, 1xEVDO
Notes Subop codes denote:
1: Mag error graph
2: Phase error graph
3: EVM error graph
Couplings When Auto Scaling is On and this parameter is changed, Ref Value will
change to adjust the trace to one that is most suitable for the window.