Resistance Measurement Procedure - Datron 1061A User Handbook Manual

Resistance
measurement procedure
1
Select '2-wire'
or
required
(1061 A:
6
V
2
digits)
(1071
:
7
V
2
digits)
2-wire
measurements
1*
For
the
majority
of applications, the
simple 2-wire
arrangement will
be adequate.
However, the value
displayed
will
include
the resistance
of
the
connecting
leads.
Use
a
screened twisted pair cable to
reduce induced
voltages, particularly
where
Rx
is
high.
4-wire
measurements
1+
With
a
4-wire
connection the
lead
resistances
have negligible effect
and only the
value
ot
Rx
is
displayed.
The
4-wire connection, as
shown above
using
two
screened
twisted pair
cables,
is
also
suitable for
measuring
high resistances
with
long
cables since the effects
of leakage
and capacitance
between
leads
is
eliminated.
When making
very
high
resistance
measurements
the' fl
Guard' terminal
should also
be connected to
a guard screen
wrapped
around
the
resistor,
or the case
it
is
mounted
in,
to
reduce
any errors
due
to noise.
2-7