Advanced Features
The advanced features of this multimeter are all accessed using the keys in the top two rows of
the keyboard. Broadly, they divide into First Level Modifiers which are accessed via dedicated
keys (dB, Hold and Null) and Second Level Modifiers which are all accessed from a menu using
the FUNCTION modifier key.
All modifiers are post-processors of some sort which act on the basic measurement to produce a
modified result. Most modifiers make use of the secondary display to show either the modified
results with the actual reading in the main display, or vice-versa; consequently Dual Measurement
Mode is not allowed when running any of the modifiers. Selecting any modifier cancels Dual
Measurement Mode.
First Level Modifiers
The following modifiers are selected directly using a dedicated key.
Hold
Pressing Hold freezes the main display and shows the HOLD annunciator. The normal, updated,
reading will be shown in the secondary display if the meter is not in dual measurement mode,
except for capacitance. Hold does not operate on the secondary display.
Hold can be used with dB and Null. Hold is cancelled by pressing Hold again or by changing
range or function.
T Hold
T Hold is selected by pressing Shift then T-Hold (the shifted function of Hold); T-HOLD shows in
the display. In this mode the meter will hold a reading until a new non-zero measurement has
been detected; this allows the user to touch-probe the measurement point, remove the probes
and read the meter afterwards. Note, however, that care should be taken when using T-Hold with
the most sensitive voltage ranges; when the probes are lifted from the circuit being measured,
their high impedance means that stray pick-up might generate another ‘valid’ reading and the true
T-Hold reading may be lost.
T-Hold operates in both manual and autorange modes; it is cancelled by pressing Hold again or
by changing function.
Null
Null is selected by pressing the Null key. Pressing Null locks the meter in the selected range,
shows NULL and MAN in the display, stores the current reading and subtracts it from all following
readings. The normal, un-nulled, reading will be shown in the secondary display if the meter is not
in dual measurement mode, except for capacitance.
Null can be used with Hold. Null is cancelled by pressing Null again or by changing range or
function.
dB
dB (deciBel) can be selected only when Vac is already in the main display. Pressing dB shows
the dB value of the Vac measurement (referred to the current impedance setting) and displays the
dB annunciator. dBs are shown in a fixed format with 0.1dB resolution, whatever range the Vac
measurement is being made on. If no secondary function is selected the normal reading will be
shown in the secondary display.
The value displayed is in dBm and is calculated from the formula:
dB = 10 log
10
(1000 x V
2
/R)
Where R is the selected reference impedance.
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