Datasheet NP72 series Specification

MOVING-COIL MEASURING

INSTRUMENTS

Application: Moving-coil measuring instruments serve to measure direct current and direct voltage. For

Meters:

Moving-coil measuring instruments are manufactured according to DIN EN 60 051 as well as

Design:

Accuracy: According to DIN EN 60 051 class 1,5, in special design

System of protection: According to DIN EN 60 529
Front side IP 52, in special design IP 54
Terminals shock-proof, IP 10

the extension of the measuring range shunts, protective resistors or voltage dividers will be
applied. The own consumption of moving-coil measuring instruments is very low; thus they
are suitable for being connected to shunts, impulse transmitters, thermoelectric elements,
measuring transducers and the like.

Moving-coil measuring instruments with rectifier serve to measure alternating current and
alternating voltage. They measure the arithmetic mean value however are designed so that
in case of sinusoidal quantities they will indicate the effective value. In case of non­sinusoidal quantities an effective value rectifier will be provided for by which peak factors of
max. 8 still can be well processed. Hereby the maximum error will amount to less than 1 %.

- Core magnet measuring system

- Spring-loaded toe bearing in sapphire stones

- Independent on interfering fields

- High damping

- Linear course of scale

to the further VDE and DIN directions concerned. The precision amounts to 1,5 % referred to
the final value of the measuring range. The own consumption is situated between 5 µW and
50 µW. The measuring ranges as small as pollible amount to 25 µA and 10 mV. A measuring
amplifier will be provided for in case of falling short of these values.

When equalizing moving-coil measuring instruments for the connection to shunts on
principle a feed resistor of 0,06 Ohm will be considered; this corresponds to a feed line of 1,3
m, 2 x 0,75 mm². Moving-coil measuring instruments can be overcharged 1,2-fold
permanently, ammeters up to 10-fold for a short period and voltmeters up to twofold. As for
the rest DIN 60 051 will be applicable.

The connection will be effected by screws M 4 for voltmeters and ammeters up to 15 A,
screws M 5 up to 60 A.

class 1

MÜLLER + ZIEGLER GmbH & Co. KG, Industriestr. 23, D-91710 Gunzenhausen

Tel. [phone] Fax [phone]

http://www.mueller-ziegler.de ,e-mail: [e-mail]