6
2.2 Errors and Extraordinary Strains
If suspected that the instrument is no longer operating safely, do not use. Send
the instrument in for repair; see paragraph 8.4.
Instrument will not operate safely if:
• measurement cables are damaged,
• the instrument demonstrates visible damage,
• the pointer no longer responds,
• one of the LEDs is defective,
• the instrument no longer functions,
• after lengthy periods of storage under unfavorable conditions.
Observe the following safety precautions:
• Operate Instrument with batteries or storage batteries. Do not use AC Line
connected power supplies as they are life endangering.
• Watch carefully for unexpected voltages at devices under test. (For example,
capacitors can be dangerously charged.)
• Make certain that measurement cables are in flawless condition, e.g. no dam-
age to insulation, no creases, no interruptions etc.
High Voltage!
Do not touch the test probes or the device under test, (DUT), during voltage testing!
High-voltage of up to 5 kV can be present!
Accumulation of Moisture
Avoid any accumulation of moisture on the tester, on the measurement cables or
on the unit, because leakage currents may be caused by high-voltages at ex-
posed surfaces. Even isolated components may carry high-voltages.
NOTE: Overvoltage Influence
If the reversible fuse (PTC thermistor) responds to an overvoltage or an extrane-
ous voltage, do not resume measurement until a cool-down period of approxi-
mately 2 minutes is
observed.
2.3 Safety Symbols
Safety symbols are shown and explained on inside front cover of this manual.
3. APPLICATIONS
The MODEL 505 Insulation Tester complies with regulation IEC 61557/EN 61557
“Measuring and Monitoring Equipment for the Testing of Electrical Safety in Sys-
tems with Nominal Voltages of up to AC 1000 V and DC 1500 V”.
Part 2, insulation resistance testers.
It is suited to measure insulation resistance for devices and systems in a voltage-
free condition with nominal voltages of up to 1000 V. It is also suited for measuring
insulation resistance of up to 1 T
with open-circuit voltages of up to 5000 V.
!
w ww . . co m
information@itm.com1.800.561.8187
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