Sets or returns the DCW reference value in uA or 
mA. The test must first be in DCW mode before 
this command can be used. 
The DCW reference value shares the identical limit 
of HI SET value, which is 11mA at the maximum. 
For instance, when HI SET value is set 5mA, the 
reference value can therefore be set up to 6mA. 
Note: An “Err” message will be shown on display 
if the DCW Voltage X (HI SET value + REF) is > 50 
watts for GPT-12XXX or the DCW Voltage X HI 
SET value + REF is > 100 watts for GPT-15XXX or 
the DCW Voltage X HI SET value + REF is > 120 
watts for GPT-15012. An “DC Over 50W” or “DC 
Over 100W” or “DC Over 120W” message will be 
returned after using the query command 
“SYSTem:ERRor ?” in remote control. 
Sets or returns the DCW percentage of initial 
voltage. The test must first be in DCW mode 
before this command can be used.