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5.
Precautions.
5.1.
E and L terminals.
If one point of the circuit to be measured is connected to ground, connect that part of the circuit to the E side measuremnet lead. This
is a safety measure. In general however, either terminal of the tester may be used for the ground side connection.
5.2.
Using the Guard terminal.
The ‘G’ terminal on the insulation tester is a guard terminal and used to eliminate the effect of surface leakage on measured values.
For example, when measuring the insulation resistance of a cable, a bare wire can be wrapped around the insulating layer (Fig. 1)
and connected to the guard terminal, causing the leakage current to flow into the meters terminal, eliminating this cause of error and
leaving only the true resistance value to be measured displayed.
6.
LO BAT alarm.
The LO BAT, battery alarm may light when measuring very low values of resistance (below
6.1
500KΩ). This due to the large amount of power consumed when measuring such small
resistances. When subsequent resistance measurements of high values result in the
LO BAT LED disapearing, the meter batteries should be assumed to be normal.
WARNING! When the 500V ON LED is on, 500V are present between E and L terminals.
p
Use caution when handling the instrument in this condition.
7.
MAINTENANCE
WARNING! Before attempting to open the case, ensure that test leads have been disconnected
p
from measurement circuits to avoid electric shock hazard.
7.1.
To change the batteries remove the rear cover by unscrewing the centrally located case
mounted screw and insert four new AA batteries observing the correct polarity.
6.
DECLARATION OF CONFORMITY
Declaration of Conformity We, the sole UK importer, declare that the product listed below is in conformity with the following standards and directives.
INSULATION TESTER ACCESSORY
Model: MM.404.261
73/23/EEC Low Voltage Directive
89/336/EEC EMC Directive
93/68/EEC CE Marking Directive
NOTE: It is our policy to continually improve products and as such we reserve the right to alter data, specifications and component parts without prior notice.
IMPORTANT: No liability is accepted for incorrect use of this equipment.
WARRANTY: Guarantee is 12 months from purchase date, proof of which will be required for any claim.
INFORMATION: For a copy of our latest catalogue and promotions call us on 01284 757525 and leave your full name and address, including postcode.
Fig. 1
Sole UK Distributor
Sealey Group,
Bury St. Edmunds, Suffolk.
The construction file for this product is held by the Manufacturer and may be inspected,
by a national authority, upon request to Jack Sealey Ltd.
Signed by Mark Sweetman
For Jack Sealey Ltd. Sole UK importer of Sealey Professional Tools.
01284 757500
01284 703534
1st September 2004
www.sealey.co.uk
Web
sales@sealey.co.uk
email
MM404.261 - 1 - 070105
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