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5.5 Impedance and admittance

If the circuit in Fig. 3 is powered by a sinusoidal

AC voltage source instead of a DC source, us-

ing the definitions for impedance Z = V/I and

admittance Y = I/V means that AC measure-

ments can also be measured in a variety of

ranges in a similar way to the DC quantities in

5.4.

The Escola 10 is particularly useful in this re-

spect because it allows for measurements to be

made not only at 50 Hz, but right across the low-

frequency range.

5.6 Measurements with the zero point of the

needle centred

This kind of measurement can only be made in

DC ranges.

To make a measurement with the zero point

•

in the centre, push the mode switch to

Before measuring the external quantity,

•

calibrate the zero point using the trimmer to

set the point in the direct centre of the scale.

The full extent of the measuring remains avail-

able so there is no separate labelling for the

range selector switch.

For a range 0 V ... 10 V, for example, the limits

now become -5 V ... 0 V ... +5 V absolute or 0 V

... ±5 V. Positive values of voltage at the V

socket or current at the A socket cause the nee-

dle to move to the right while negative values

cause it to move to the left. The scales are la-

belled accordingly (smaller auxiliary numbering).

5.7 Calibrating zero-point

Turn on the multimeter, set the maximum

•

voltage range of 600 V and connect the

ground socket to the voltage socket using a

short lead.

Set up the multimeter in a horizontal position

•

and correct the zero-point of the dial with the

help of the adjustment knob.

5.8 Switching off

Always set the measuring mode to

•

completion of measurements to avoid un-

necessary use of the battery.

6.1 Changing the battery

All measuring leads must be discon-

nected from the multimeter before the

casing is opened.

From time to time, check the state of the

•

battery (see 5. Operation).

Remove discharged or corroded batter-

ies from the multimeter.

During prolonged periods of disuse,

also remove the battery from the mul-

timeter.

Unscrew the back of the casing.

•

Replace flat batteries with 1.5-V alkaline

•

batteries of size AA IEC LR6.

Place the negative pole of the battery on the

•

spring.

The polarity is also marked on the board with

plus and minus symbols. Additionally, a me-

chanical clip on the positive side prevents bat-

tery contact when polarity is reversed.

Close casing again.

•

Fig. 4 Changing the battery

after

Do not dispose of the

•

battery

household refuse. Fol-

low the local regula-

tions

(In

BattG;

2006/66/EG).

6. Maintenance

regular

Germany:

EU: