HT instruments SPEED418 - Manual (Page 7)

400 Series
EN - 6
2. GENERAL DESCRIPTION
2.1. INTRODUCTION
The instrument you purchased, if used in compliance with the instructions given in this manual,
will guarantee accurate and reliable measures. This manual covers following products:
ISO410, SPEED418, COMBI419, COMBI420. The differences in model characteristics are
described in the following table:
Function ISO410 SPEED418 COMBI419 COMBI420
AUTO  
LOW    
M    
RCD and   
Ra 15mA   
LOOP   
123   
AUX 
LEAKAGE  
POWER 
Tab. 1: Characteristics of 400 Series 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: 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 15mA 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, lighting and noise level) 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.