Megohmmeter
Model 24508
Page 11
Technical data
General informa
-
tion
Pr
eparations for
use
Contr
ols and con
-
nections
Manual operation
of the unit
Contr
olling the
unit r
emotely
Maintenance and customer service
General informa
-
tion
1.1 Use
This equipment, given its specification, can be used for all common applica
-
tions. It is particularly suitable for resistance measurements across insulators
such as cable insulation, films, textiles, floor coverings, insulating oils etc.
With test voltages of 45 V, 100 V, 250 V and 500 V, the unit complies with most
test regulations such asDIN 51953, DIN 53482, DIN 54345.
The guard circuit can be used to measure individual resistances in a delta con-
nection e.g. a twin-core cable with common screening, or measuring insulators
in a guard ring measuring cell.
The measuring range can be selected manually or automatically. Fast serial
measurements can be performed using the integral threshold switch. If the
reading lies below an adjustable limit, the threshold monitor trips and enables
an isolated relay output. The megohmmeter is suitable for both laboratory and
industrial use.
1.2 Description
The digital megohmmeter type 24508 is a microprocessor-controlled instru-
ment for measuring insulation resistances. The unit has a clear layout and is
housed in a rugged metal case. The individual components are easily acces-
sible, providing ideal servicing conditions.
The measuring range extends from 50 k
Ω
to 10 T
Ω
or 5 pA to 10 mA for test
voltages of 45 V, 100 V, 250 V and 500 V.
The two-line LCD display and compact menu-driven operation helps the user
to set up the unit easily. Of course all settings can also be made via the RS232
interface. The connector for the isolated threshold output and the external
test-start/stop is located on the rear panel.
1. General information
