HT 400 Series, Руководство пользователя

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400 Series
EN - 6
2. GENERAL DESCRIPTION
2.1. INTRODUCTION
This user manual is referred to the following models
ISO410, SPEED418S, COMBI419S,
COMBI420S
and
COMBI421
. Unless otherwise specified, the “instrument” is referred to
COMBI421 model. The following Table 1 shows the possible measuring functions:
Funzione ISO410 SPEED418S COMBI419S COMBI420S COMBI421
AUTO (Ra + RCD + M

)   
LOW

   
M
    
RCD e    
Ra    
LOOP    
123    
AUX  
LEAKAGE   
POWER
 
Table 1: Characteristics of models
2.2. INSTRUMENT OPERATION
The instrument can perform following tests (compatibly with the characteristics described
in the table above):

AUTO
Test which automatically performs the following test sequence: total
earth resistance through socket, tripping time of the differential switch,
insulation resistance between phase and earth.

LOW

Continuity test of earth conductors, protective conductors and equipotential
conductors with test current higher than 200mA and open circuit voltage
between 4V and 24V.

M

Insulation resistance measurement with a direct test voltage of 50V, 100V,
250V, 500V or 1000V.

RCD
Measurement of following parameters on A-type ( ) and AC-type ( )
general and/or selective differential switches with nominal current up to 1A:
tripping time, tripping current, contact voltage (Ut), total earth resistance (RA).

LOOP
Measurement of line impedance and fault loop impedance with
calculation of the assumed fault current.

Ra
Measurement of total earth resistance with 15mA without causing the
differential protections’ tripping.

123
Indication of the phase sequence.

AUX
Measurement of the environmental parameters (temperature, humidity, air
speed and lighting) by means of optional probes.

LEAKAGE
Function for measuring leakage current in real time by means of an
(optional) HT96U clamp.

POWER
Real-time displaying the values of the electrical quantities in a single-
phase system and the harmonic analysis of voltage and current up to
the 49
th
harmonic with THD% calculation.