HT 400 Series User Manual

400 Series
EN - 4
1. SAFETY PRECAUTIONS AND PROCEDURES
The models of 400 Series (ISO410, SPEED418S, COMBI419S, COMBI420S and
COMBI421) were designed in compliance with the following Directives IEC/EN61557 and
IEC/EN61010, relative to electronic. Before and while measuring, carefully follow the
instructions below:
 Do not perform voltage or current measurements in humid environments.
 Do not perform measurements near explosive gas or material and fuels or in dusty
environments.
 Avoid contact with the circuit tested if no measurement is being performed.
 Avoid contact with exposed metal parts, test terminals not in use, circuits, etc.
 Do not perform any measurement if instrument anomalies are detected, such as
deformations, breaks, leakage of substances, no display reading, etc.
 Pay special attention when measuring voltages above 25V in special environments
(building yards, swimming pools...) and above 50V in ordinary environments, as there is a
risk of electric shock.
 Only use original HT accessories.
In this manual, following symbols are used:
CAUTION: Follow the instructions given in this manual; improper use may
damage the instrument, its components or create dangerous situations for the
operator.
DC or AC voltage or current.
Unidirectional pulsating voltage or current.
1.1. PRELIMINARY INSTRUCTIONS
 This instrument has been designed for use in the environmental conditions specified in
§ 11.2.1 and § 11.4.1. Do not use in different environmental conditions.
 The instrument may be used for measuring and verifying the safety of electrical
systems. Do not use on systems exceeding the limit values specified in § 11.2.1.
 We recommend following the ordinary safety rules aimed at: your protection against
dangerous currents, the instrument’s protection against improper use.
 Only the accessories provided with the instrument guarantee compliance with safety
standards. They must be in good conditions and must be replaced, if necessary, with
identical models.
 Check that batteries are correctly inserted.
 Before connecting the test leads to the circuit being tested, check that the desired
function has been selected.
1.2. DURING USE
We recommend carefully reading the following recommendations and instructions:
CAUTION
Failure to comply with the CAUTIONs and/or instructions may damage the
instrument and/or its components or cause dangers for the operator.
 Before changing function, disconnect the test leads from the circuit tested.
 When the instrument is connected to the circuit tested, never touch any lead, even if
not in use

HT 400 Series Specifications

General

Type	Digital Multimeter
Diode Test	Yes
Auto Ranging	Yes
Data Hold	Yes
Operating Temperature	0°C to 40°C
DC Current Range	400μA to 10A
AC Current Range	400μA to 10A
Resistance Range	400Ω to 40MΩ
Continuity Test	Yes
Display	LCD, 4000 counts
Measurement Range	As per individual functions