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6.4
Making Voltage Measurements
Having selected Vdc or Vac, voltage measurements are made using the red
INPUT HI
socket
and the black
INPUT LO
socket within the yellow area of the panel. Five measurement ranges
(auto or manual) are available from 100mV to 1000V (dc) or 750V (ac).
The meter will show a minus sign
{-}
(on dc measurements) when the voltage applied to the
INPUT HI
socket is more negative than that applied to the
INPUT LO
socket.
The maximum voltage that can be applied between
INPUT HI
and
LO
is 1000V DC or 750V
AC; damage to the instrument may result if this limit is exceeded.
WARNING!
The maximum input voltage to ground must not exceed 1000V peak. Safety will be
impaired if these ratings are exceeded, see Safety section at the beginning of the manual.
6.5
Making Current Measurements
Having selected Idc or Iac, current measurements up to 1.2A (1200.00mA) are made using the
white
mA
socket and the black
INPUT LO
socket; current measurements up to 10A are made
using the
10A
and
LO
sockets. The meter will show a minus sign
{-}
(on dc measurements)
when the polarity of the current is such that it flows out of the
mA
or
10A
sockets rather than
into it.
Using the
mA
socket three measurement ranges (auto or manual) are available from 10mA to
1000mA. Measurements up to 10A can be made using the
10A
socket having manually ranged
to 10A with
[
ଢ଼@
.
The 10mA, 100mA and 1000mA ranges, using the
mA
socket, are protected by a 1.6A (F) HRC
fuse. The 10A range, using the
10A
socket, is protected by a 10A (F) HRC fuse. Both fuses are
accessed via a panel on the base of the instrument.
The input test leads and AC power lead must be disconnected before opening the fuse
access panel.
Note:
After measuring high currents (i.e. above half scale) using the 1A or 10A ranges, thermal
voltages are generated that may create errors when making measurements on the most
sensitive dc voltage, current or Ohms ranges immediately afterwards. To ensure that the
specified accuracy is maintained, allow 10 minutes for the thermal effects to reduce before
making sensitive measurements.
6.6
Making Resistance Measurements
Pressing
[
:
:
2/4]
selects resistance measurement in either 2 wire or 4 wire mode. Successive
presses alternate between the modes as indicated by
{2W
:`
or {4W
:`
appearing briefly in the
secondary display. Six measurement ranges (auto or manual) are available from 100
:
to
10M
:
.
6.6.1 Two Wire Measurements
Normal (2 wire) resistance measurements are made using the
INPUT HI
and
LO
sockets within
the yellow area of the panel. This measurement mode is appropriate for higher resistance
measurements, and for lower resistance measurements where high precision is not required.
The effects of test lead resistance can be removed using
:
Null if required – see
section 7.3
.
