I.C.E Supertester 680 R Operator's Manual And Repair Manual page 14

R'l+ R2= 1600rL
0,96"4_a
0,576a 5,76Q s7,6a
57612
Simplified
0hmme.
tric
0C CircIit.
O.C. RESISTANCE MEASUREMEI{TS
Ft,R VERY
t()W
RESISTANCES
(Tenths of ()hm
ts
30
0hms)
0n
our
SUPERTESTER
680
R, very low
resistances,
e.g. tenths
of
0hm,
can be read
to
a
good
accuracy.
To be able
to
carry
out very low 0hms measurements
proceed as follows:
first' with a
bridge
supplied
with
the
iit,
short-circuit
the two
sockets
f)
and
Ox1;
Then.
with.
the
rheostat set
the'needle on the erid
of the
scale and nreasure
the
low resistance through
the two probes
which nrust be inserted
in the
sockets marked: LOW O.
I
SJx10
S)
r
100
Sl
r
1C00
ln ihe model
680
R
the
reading
can be made directly
in the
scale
on the
black
arch located
imr.aiateti
above
the dB
scaie.
Where
a very
a.ccurate
reading
is
required,
then the
very
iow resistance
of the probe wire should be tak6n
intg
account
iy
shuniing the.probes.before
insertins
the
resistance
under examination.
The probe resistance should
be
subtracted
from
thi
total
reading obtained
after
measuring
the resistance under
examination.
As
it
is
shown
in
the scale,
the
0
Ohm
does not correspond
to
the absolute zero
of
the
instiuruni
beiause also
the very low resistance
of the tester internal
circuit
has been taken
into
acccunt
for a higher
accuracy.
+
Diagram showing how
to
measurs
resistaIces
wlth
the
Supertester
680
R.