Making Basic Measurements
This section describes how basic measurements are made, i.e. single measurement mode only
and no post-processing of the results.
Scale Length
The scale length is ±12000 for all measurements except capacitance (full scale 1200) and the
20MΩ resistance range (full scale 2400).
Function Selection
All functions are directly selected by pressing the appropriate function key (Vdc, Ω, Hz, etc.).
Changing function always cancels any modifiers already running and sets autorange; providing
the appropriate function has been selected (e.g. Ω for resistance measurement) and the
parameter to be measured is within the range of the meter, a valid reading should always be
shown. The exception is 10A current measurement which requires manual range selection, see
next section.
The units and function are shown in the display (e.g. mV dc) together with AUTO to indicate
autorange.
When a function is selected in this way the smaller secondary display will show the operating
range with units, except for capacitance. If this is not required the secondary display can be
turned off by pressing Select 2nd followed by Cancel; the range will be displayed again when the
function is next changed, or by pressing Select 2nd twice.
The Continuity/Diode check test key selects continuity test with the first press and then alternates
between the modes with further presses. The appropriate annunciator indicates the current
selection. Continuity sets the meter to the 1000.0Ω range and buzzes for values below
approximately 10Ω.
Vdc+Vac or Idc+Iac measurements are made by pressing both Voltage range or both current
range keys together. The reading displayed is the RMS sum √(dc
2
+ ac
2
) and ac+dc is shown
beside it. Both ac and dc measurements are made on the same range: the instrument will
autorange to a range which gives an in-range reading for both the ac and dc component of the
parameter. However, if the result exceeds the range maximum the meter will autorange up to
permit the result to be shown as an in-range reading.
Range Selection
Selecting a new function always sets autorange to ensure an in-range reading is made with
maximum resolution whenever possible; the meter ranges up at 12000 counts and ranges down
at 1000 counts.
There are, however, situations when it is desirable to lock the range; for example, to stop the
meter autoranging to the 20MΩ range and back between successive resistance measurements of
lower resistance values, or to set a lower resolution range when an unstable parameter is being
monitored. To lock the range, change from auto to manual ranging, see below.
Manual range changing is selected either by alternate presses of the Auto/Man key, which locks
the meter in its present range, or by using the Range Up/Range Down keys which both change
the range and lock the meter in that new range. The MAN annunciator is displayed to indicate
manual ranging. Overrange is indicated by flashing the display at 12000 counts. Autoranging can
be restored by pressing the Auto/Man key again.
As explained later in the appropriate sections, secondary functions in dual measurement mode
are autoranging only; the exception is 10A range selection which is manual only, for both main
and secondary displays, at all times.
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