Operation Manual

Chapter II

Portable digital multimeters 19

1.4. Protection devices

This instrument is fitted with various protection devices :

∗ Varistor protection for limiting transients of over 1100 V at the VΩ terminal,

particularly 6 kV pulse streams as defined in French standard IEEE 587.

∗ A PTC (positive temperature coefficient) resistor protects against permanent

overvoltages of up to 600 V during resistance, capacitance, continuity and

diode test measurements. This protection is reset automatically after overload.

∗ 2 HBC fuses provide protection up to 600V during measurements of intensity

type (except MX 23).

∗ An IP protection rating of 40.

1.5. Instructions

∗ Before opening the instrument, always disconnect from all sources of electric

current and make sure not to be loaded with static electricity, which may

destroy internal components.

∗ Fuses must be replaced (except MX 23) with fuses of the same rating and

type.

∗ When the instrument is open, remember that some internal capacitors can

retain a dangerous potential even after the instrument is powered down.

∗ It is recommended to remove the battery from the instrument if not used.

1.6. Warranty

This equipment is warranted against any defects of manufacture or materials

according to the general conditions of sale.

During the warranty period (3 years), defective parts will be replaced, the

manufacturer reserving the right to repair or replace the product. In the event of the

equipment being returned to the distributor or to a local agency, carriage to the

centre shall be payable by the customer. The warranty does not cover the following:

1. Repairs necessitated by misuse of the equipment or use in association with

incompatible equipment.

2. Modification of the equipment or any related software without the explicit

authorization of the manufacturer.

3. Repairs necessitated by attempts to repair or maintain the product made by a

person not approved by the manufacturer.

4. Adaptation to a specific application not provided for in the specifications of the

equipment or the user manual.

5. Damage after a drop, a shock or flooding.