User Manual    California Instruments 
CSW Series    179 
Number  Message String  Cause  Remedy 
22 
"Waveform harmonics 
limit" 
Harmonic contents of 
user defined wave 
shape is too high and 
could damage 
amplifier output 
stage. 
Reduce harmonic content or reduce 
fundamental frequency programmed. 
24 
“Output Relay must be 
closed” 
Attempt to change 
voltage range while 
output relay is closed. 
Open output relay first, then change 
range. 
25 
“Overvoltage 
Protection Trip” 
Over voltage trip limit 
exceeded. 
Check for inductive kickbacks or 
overshoot on eut. 
26 
“Peak Current 
Protection Trip” 
Peak current exceeds 
trip limit. 
Reduce load or increase trip level. 
29 
“DC component 
exceed limit” 
Waveform selected 
has too much DC 
content to be 
supported on AC 
coupled voltage 
range. 
Use AC waveform without DC offset 
only or select DC coupled voltage 
range. (Applies to MX with –HV 
models only). 
30  “Dc Bus Fault 
Amplifier DC bus 
lower than required to 
support the output 
load 
AC Line input too low.  
Table 9-1: Error Messages.