Manual Gossen Metrawatt METRAHIT X-TRA (page 19 of 71) (English)

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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 chapter 4.1.2).

•With the DATA function (see chapter 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

Depending upon deviation from the zero point, zero balancing or

a reference value for relative measurements can be stored to

memory:

The applicable reference or correction value is deducted

individually for the respective measuring function as an offset from

all subsequent 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 measurement 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 | ESC key.

The instrument acknowledges zero balancing with an acoustic

signal, and the “ZERO ΔREL” 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 | ESC key.

Note

As a result of TRMS measurement, the multimeter dis-

plays a residual value of 1 to 30 digits with short-circuited

measurement cables as the zero point for V AC / I AC or

V(AC+DC) / I (AC+DC) 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).

Setting the Reference Value

Ð Plug the measuring cables into the instrument and measure a

reference value (max. 5000 digits).

Deviation from zero

– With short-circuited measurement cables for V, Ω, A

– With open input for capacitance unit of measure F

Display

0 to 200 digits ZERO ΔREL

> 200 to 5000 digits ΔREL

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