All
the ranges in bold
faced type
are obtained by
pressing
the button
AVx2
which
switches
the
sensitivity of the
instruments
without changing the
value
of the resistance
shunted on
the circuit
in consideration,
with consequent higher
accuracy in
the
reading.
Furtherm0re,
the above ranges
of the
SUPERTESTER
680 R can be
extended with
the
aid of
accessories are
specifically
designed f0r
this
purpose
by l.C.E.
The
principal
accessories
arer
Electronic
range extender Mod.
30
Direct Voltage 5/25/100 mY
-
2,5/10
V with 10 MOhm1V.
Direct
Current
0,111,/10
$A.
Temperature
indicator
-
100/+ 100/250/1000'C.
Watt-meter
Mod.
34 ranges
100/500
/25A0
W.
Electronic
Volt.
ohmeter Model
660 l.C.E.
Transistor and diode
tester
Transtest Mod.
662 l.C.E.
Signal Injector Model
63
-
l.C.E.
Pincel
ammeter Amperclamp
for low
and high ammetric measurements
in
alternaterJ current
without
interrupting
the circuits
to be tested
(from
250 mA
to 500 Amperes).
Transformer
for high
ammetric measurements
in
alternated current Modet
616 l.C.E.
(trom
25 to 100
Amperes).
Additional
shunts Model
32
l.c.E. for high
current measurements
in direct
current
frunr
25-50
to 100 Amperes
D.C.
High Voltage-pr0be
M0d.
18 l.C.E.
for high
vottage tests
(25,000
V
-
D.C.).
Temperatule
probe
for instantane0us
temperature
tests m0d.3E
l.C.E., two scalcs
from
-
50 to
*
40.C and from
f
30 to
+
200.C.
light meter
Model 24
l.C.E.
two scales: from
2 lo 2OO Lux
and from 2,000 io 20,000
Lux.
Sequencescope
Model 28
l.C.E.
as a
phase
cyclic
indicator.
Resistance
multiplier Mod.
25.
tluxmeter
Model 27
l.C.E. for magnetic
field measurement.
4
The
characteristics
of
all
the
above
mentioned
accessories
are briefly described
from
page
57
to 63.
(Furiher
details will be
sent on
request).
IMPSRTANT:
To
ensure
the long
life of
the SUPERIESTER l.C.E.
Model
680
R, carefully
fottow
all
the maintenance instructi0ns
0n Page 36.
ACSURACY
OF THE READINE
The
accuracy or better the class of
our Supertester
680 R
is 1%
in D.C.
and 2% in A.C.
According
to the international rules in
force the accuracy of
an indicating instrument
(the
to
called
"class
of the instrument") is
given
as an abs0lute
percentage
and therefore the
maximums
permissible
reading
error is always referred
to the
accuracy
percentage guaranieed
by
the Producer referred t0
the full scale value.
For
instance:
let us
examine
an
instrument
guaranteed
by the
producer
as a
"class
2 instrument"
for the
range
250
Volt full
scale
value; in this case the maximum
permissible
error
+
Zok
is to be referred
to the full
scale
value that, in the
case of the range 250 V
corresponds t0 an
absolute value of 5 Volts.
According
to the international rules
and
what
previously
said, the
instrument can be
considered belonging to the
class
2
instrument, only if
the
error
is not
higher than
i-
5
volts
in any
point
of the
scale.
That
is, the instrument belongs
to such an accuracy class
(2%)
if it
for
instance,
indicates
255
or 245 instead of 250, 105
or 95 instead
of
10C; 15
or
25
instead of 20.
From this
it
can be seen that the
error, as a
relative
percentage
is increasing
m0re
and more in the
initial
part
of the
scale;
as a consequence,
in 0rder to have the
most accurate readings
it
is
always advisable to choose, while us!ng
a Tester, the most
convenient range
so that
the reading is
carried out
rnost
preferentially
in
the end scale area.
According
to
the
main international
rules, the control
0f the accuracy is to be
carried out
with the instrument lying orizontally,
at a 20.C temperature
and, in the
case of measurement
in A.C.,
with sinusoidal
current.
lf the above mentioned
c0nditi0ns change, for the
accurate c0ntrol 0f
class accuracy, the
!nterferences due to
such variations will have to be taken
into account.
5
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