Measurement Commands 
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  OFF: Update every time. 
  ON: Update when a new maximum value displays   
Command syntax: 
MEASure[:SCALar]:CURRent:AMPLitude:HOLD <bool> 
Parameter: 
0|1|OFF|ON 
Reset value: 
OFF 
Query Syntax: 
MEASure[:SCALar]:CURRent:AMPLitude:HOLD? 
Returned value: 
0|1 
MEASure:HARMonic? 
This command is used to read all the harmonic data. 
The order of returned data is the absolute value of total harmonic, the total 
harmonic component, the fundamental frequency, and each range is as follows: 
  The absolute value of 0-50 times voltage harmonic. 
  0-50 times voltage harmonic component 
  0-50 times harmonic phase angle 
Command syntax: 
MEASure:HARMonic? 
Parameter: 
None   
Returned value: 
<NR3>,<NR3>………..<NR3> 
MEASure:VOLTage:HARMonic? 
This command is used to read the harmonic amplitude. 
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