Gossen MetraWatt METRACAL MC, Operating Instructions Manual

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GMC-I Messtechnik GmbH 19
Control Functions
4.1.3 Quick Measurements
Measurements performed using a suitable fixed measuring range
are executed more quickly than those which utilize automatic
range selection. Quick measurement is made possible with the
following two functions:
• Manual measuring range selection , i.e. selection of the measuring
range with the best resolution (see section 4.1.2)
or
• With the DATA function (see section 4.4). In this way, the
appropriate measuring range is selected automatically after the
first measurement, and the second measurement is executed
more quickly.
The selected measuring range remains active for the subsequent
series of measurements with these two functions.
4.2 Zero Offset / Relative Measurements
Zero balancing or a reference value for relative measurements can
be stored to memory depending upon deviation from the zero
point:
The relevant reference or correction value is deducted individually
for the respective measuring function as an offset from all future
measurements and remains in memory until deleted, or until the
multimeter is switched off.
Zero balancing and reference value adjustment can be used for
auto-ranging, as well as for manual measuring range selection.
Zero Balancing
Ð
Plug the measuring cables into the instrument and connect the
free ends to each other, except for capacitance measurement
in which case the ends of the cables are not connected to
each other.
Ð
Briefly press the ZERO / SEL | ESC key.
The instrument acknowledges zero balancing with an acoustic
signal, and the “D ZERO” symbol appears at the LCD. The
value measured at the moment the key is pressed serves as a
reference value.
Ð
Zero balancing can be cleared by once again pressing the
ZERO / SEL | ESC key.
Note

As a result of TRMS measurement, the multimeter displays a
residual value of 1 to 30 digits with short-circuited
measurement cables as the zero point for V AC/I AC
measurements (non-linearity of the TRMS converter). This
has no influence on specified accuracy above 2% of the
measuring range (or 3% in the mV range).
Deviation from zero point
– with short-circuited measurement cables for V,
Ω
, mA, RTD
– with open input for capacitance unit of measure F
Display
0 to 200 digits
Δ
ZERO
> 200 to 15000 digits
Δ