User Manual    California Instruments 
16  CSW Series 
Function Specification 
External Gain Control, RPV  0 to +7.07 VDC for 0 to programmed output. 0 to full-scale output for CSW. 
(±2% of full scale output 
External Input Impedance  40K for each of the three inputs.  
XLOAD  The CSW5550 is guaranteed to be stable for power factors from 0 leading to 0 
lagging.  The most difficult load for most amplifiers is driving large capacitive 
loads (10-10,000F).Though stable with its normal loop compensation, the 
CSW can provide additional phase/gain margin with these unusual loads by 
selecting XLOAD On.  This significantly improves the transient response of the 
amplifier. 
X-Load should only be used for reactive loads, and with programmed 
frequencies of less than 1000 Hz. 
 
 
Output current for which specifications apply is de-rated for frequencies above 400Hz as a function of 
voltage, and for maximum power of 1850 VA per phase, as shown in Figure 2-1 and Figure 2-2.