Manual Gossen Metrawatt METRAOHM 413 (page 22 of 48) (English, German, French)

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4.3 Zero balancing

The METRAOHM 413 must be calibrated together

with the entire measurement line before each

measurement test series (see measurement setup

4.2). To take temperature changes into account, zero

balancing is also necessary if the same measurment

line is used again after a period of time.

Balancing occurs automatically for all measuring

ranges of 1μA ... 200 mA.

For balancing the device has to be switched o.

Contact the test electrode of the METRAOHM

413 to the reference earth and ensure safe

contact.

Press button

and then the button

at the

same time. The zero balance will be performed.

The display shows “CAL“. After expiration of

time the value “0.00 ... 0.04 Ω“ is indicated on

the display.

Attention!

Maintain contact as long as “CAL“ is displayed

and the time expires.

If the message “Err“ appears, zero balancing has

failed and must be repeated. This error occurs if the

test probe slips during balancing or if the measure-

ment line is too high-resistive (>3.5 Ω).

 For test purposes we recommend that the rst

measurement always be made directly at the

reference earth (see section 4.4). The result

should be < 0.04 Ω for both polaritys.

Note: Long coiled measuring lines may cause faulty

measurments by their inductance. Resistance of the

measurement line remains in storage until a new

zero balance is performed. This value also remains in

storage if the measuring instrument is switched o,

or if the battery is replaced.

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Gossen Metrawatt METRAOHM 413 Manual

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