Digital Ground Resistance Tester Model 3640 and 4610
3
CHAPTER 1
INTRODUCTION
WARNING
“It should be impressed on all personnel that a lethal potential can exist between
the station ground and a remote ground if a system fault involving the station
ground occurs while tests are being made. Since one of the objects of tests on
a station ground is the establishment of the location of an effectively remote
point for both current and potential electrodes, the leads to the electrodes
must be treated as though a possible potential could exist between these test
leads and any point on the station ground grid.”
- excerpted from IEEE Std. 81-1962
Thesesafetywarningsareprovided toensurethesafetyofpersonnel
andproperoperationoftheinstrument.
• The instrument must not be operated beyond its specied operating
range.
• Safetyistheresponsibilityoftheoperator.
• Allmetalobjectsorwiresconnectedtotheelectricalsystemshouldbe
assumedtobelethaluntiltested.Groundingsystemsarenoexception.
• Use extreme caution when using the instrument around energized
electricalequipment.
• Neverattempttousetheinstrumenttotwistorprythegroundelectrode
orgroundwireawayfromtheequipmentbeinggrounded.
• The use of rubber gloves is an excellent safety practice even if the
equipmentisproperlyoperatedandcorrectlygrounded.
• Always inspect the instrument and leads prior to use. Replace any
defectivepartsimmediately.
1.1 International Electrical Symbols
This symbol signifies that the instrument is protected by double or reinforced
insulation.
This symbol on the instrument indicates a WARNING and that the operator must refer
to the user manual for instructions before operating the instrument. In this manual,
the symbol preceding instructions indicates that if the instructions are not followed,
bodily injury, installation/sample and product damage may result.
Risk of electric shock. The voltage at the parts marked with this symbol may be
dangerous.
In conformity with WEEE 2002/96/EC
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