Kikusui tos6200, Operation Manual

Page: 69 / 157

TOS 6200/6210 4-33
C
hap
. 4
Basic
O
per
ation
4. 10 .4 O utput Voltage L imitation (V OLT LIMIT )
This p rot ec t ive f u nc t i o n limi t s t he out p ut v o l tag e . I f t he out p ut t e r min a l v o l tag e
exceeds 5. 6 V when t he me a s ur ed v a l u e is n ot j u d g ed F AI L d ur in g a t es t, t he out p ut
v o l tag e limi tat i o n f u nc t i o n is tr ipped a nd t he "VOLT L I M I T" indic at i o n is blinked
o n t he LCD .
Since n o t es t c a n be pe r f or med f or se tt in g s f or which t he p ro d u c t o f t he t es t c urr en t
a nd u ppe r r efe r ence v a l u e (incl u din g o ffse t v a l u e) exceeds 5. 4 V , t he out p ut t e r min a l
v o l tag e will g ene ra lly n ot exceed 5. 6 V a nd t he out p ut v o l tag e limi tat i o n f u nc t i o n is
rar ely tr ipped . H o weve r, f or me a s ur emen t s u sin g f our t e r min a ls t h at u se hi g h -r esis -
ta nce le a d wi r es , or f or t w o-t e r min a l me a s ur emen t s wi t h t he o ffse t c a ncelin g f u nc -
t i o n a c t iv at ed , t he out p ut t e r min a l v o l tag e m a y exceed 5. 6 V in s o me c a ses , tr ippin g
t his f u nc t i o n . This c au ses t he t es t e r to en t e r p rot ec t i o n s tatu s .
F or ex a mple , a ss u me t h at t he DUT wi t h 0.1 9 0
Ω
is t es t ed wi t h t he t es t c urr en t se t to
25 A a nd u ppe r r efe r ence v a l u e se t to 0.200
Ω
. I f t he le a ds c o nnec t ed to t he DUT
ar e l o n g a nd f our-t e r min a l me a s ur emen t s ar e m a de u sin g le a ds exceedin g 0.03 4
Ω
b ot h c o min g a nd go in g, t he c o mbined r esis ta nce f ro m t he pe r spec t ive o f t he out p ut
t e r min a ls bec o mes 0.22 4
Ω
or gr e at e r, tr ippin g t he out p ut v o l tag e limi t f u nc t i o n f or
5. 6 V a nd dis a blin g t he t es t.
I f t he p ro d u c t o f t he t es t c urr en t a nd a c o mbined r esis ta nce f ro m t he pe r spec t ive o f
t he out p ut t e r min a ls is cl o se r to 5. 6 V , u se le a ds wi t h l o we r r esis ta nce v a l u es .
Pr ess t he STO P swi t ch to c a ncel out p ut v o l tag e limi tat i o n .
4. 10 .5 Change in ENA B LE S ignal ( SI G NAL I / O )
I f t he level o f t he E NAB LE si g n a l o f t he S I G NA L I /O c o nnec tor 's pin 23 ch a n g es ,
t he si g n a l I /O is tr ipped a nd t he “S I G NA L I /O” indic at i o n blinked o n t he LCD .
T o cle ar t his p rot ec t i o n , p r ess t he STO P swi t ch .
CURRENT LOWER UPPER TIMER
25.0
A
0.200 60.0
s
MAIN MAIN
FREQ LOWER OFF OFFSET OFF TIMER ON 50Hz
UPPER
VOLT LIMIT
CURRENT LOWER UPPER TIMER
25.0
A
0.100 60.0
s
MAIN MAIN
FREQ LOWER OFF OFFSET OFF TIMER ON
50Hz
UPPER
SIGNAL I/O