Agilent Technologies E3633A Operating Manual page 44

Chapter 3 Front-Panel Operation
Programming Overvoltage Protection
Over
Voltage
3 C l e a r t h e o v e r v o l t a g e c o n d i t i o n a n d e x i t t h i s m e n u .
N o w , w h e n y o u p r e s s
s e c o n d a n d t h e
t o m e t e r m o d e .
• A d j u s t O V P t r i p l e v e l
Over
Voltage
1 R a i s e t h e O V P t r i p l e v e l .
P r e s s
Over
Voltage
2 M o v e t o t h e O V P C L E A R m o d e .
OVP CLEAR
P r e s s
a p p e a r s o n t h e d i s p l a y . T u r n t h e k n o b t o t h e r i g h t u n t i l t h e a b o v e m e s s a g e
a p p e a r s o n t h e d i s p l a y .
Over
Voltage
3 C l e a r t h e o v e r v o l t a g e c o n d i t i o n a n d e x i t t h i s m e n u .
N o w , w h e n y o u p r e s s
a s e c o n d a n d t h e
r e t u r n t o t h e m e t e r m o d e .
• R e m o t e i n t e r f a c e o p e r a t i o n :
VOLT:PROT {<voltage>|MIN|MAX}
VOLT:PROT:STAT {OFF|ON)
VOLT:PROT:CLE
N o t e The power supply's OVP circuit contains a crowbar SCR, which effectively shorts the
output of the power supply whenever the overvoltage condition occurs. If external
voltage source such as a battery is connected across the output, and the overvoltage
condition inadvertently occurs, the SCR will continuously sink a large current from
the source; possibly damaging the power supply. To avoid this a diode must be
connected in series with the output as shown in Figure 3-1 on next page.
32
Over
k e y a g a i n , t h e " D O N E " m e s s a g e i s d i s p l a y e d f o r a
Voltage
OVP
a n n u n c i a t o r w i l l n o t b l i n k a n y m o r e . T h e o u t p u t w i l l r e t u r n
Over
k e y a n d t u r n t h e k n o b t o r a i s e t h e O V P t r i p l e v e l .
Voltage
Over
k e y t o m o v e t o t h e O V P C L E A R m o d e . T h e " O V P O N " m e s s a g e
Voltage
Over
k e y a g a i n , t h e " D O N E ' ' m e s s a g e i s d i s p l a y e d f o r
Voltage
OVP
a n n u n c i a t o r w i l l n o t b l i n k a n y m o r e . T h e o u t p u t w i l l
Set the OVP level
Disable or enable the OVP circuit
Clear the tripped OVP circuit