Gossen Metrawatt Metrahit Iso Insulation measuring device, CAT III 600 V Metrahit Iso Benutzerhandbuch

26

GMC-I Gossen-Metrawatt GmbH

Measurements: V/Hz, 

Ω,  , Temp (°C/°F), 

, M

Ω

@UISO

, A/Hz

5

Measurements

5.1

Voltage Measurement

Notes Regarding Voltage Measurement

• The multimeter may only be operated with installed batteries. 

Dangerous voltages are otherwise not indicated, and the instrument 
may be damaged.

• The multimeter may only be operated by persons who are ca-

pable of recognizing contact hazards and taking the appropriate 
safety precautions. Contact hazards exist anywhere, where 
voltages of greater than 33 V RMS may occur.
The test probes may only be only gripped up to the finger 
guard. Do not touch the metallic test probes under any 
circumstances.

• Avoid working alone when taking measurements which involve 

contact hazards. Be certain that a second person is present.

• Maximum allowable voltage between terminals 9 or 10 and 

ground (8) is 1000 V for measuring category II, and 600 V for 
measuring category III.

• Be prepared for the occurrence of unexpected voltages at 

devices under test (e.g. defective devices).  For example, 
capacitors may be dangerously charged.

• No measurements may be made with this instrument in 

electrical circuits with corona discharge (high-voltage).

• Special care is required when measurements are made in HF 

electrical circuits. Dangerous pulsating voltages may be 
present.

• Be aware of the fact that dangerous voltage spikes are not displayed 

during measurement with the low-pass filter.
We recommend measuring voltage without the low-pass filter first, in 
order to be able to detect any dangerous voltages.

• Be absolutely certain that the measuring ranges are not 

overloaded beyond their allowable capacities. Limit values are 
included in chapter 8, “Technical Data”, in the table entitled 
“Measuring Functions and Measuring Ranges” in the “Over-
load Capacity” column.