Operation Manual

26 GMC-I Messtechnik GmbH
Measurements: V/Hz – Ω – – Temp – – m – A/Hz
5 Measurements
5.1 Voltage Measurement
Notes Regarding Voltage Measurement
• The multimeter may only be operated with the batteries installed.
Dangerous voltages are otherwise not indicated, and the instrument
may be damaged.
• The multimeter may only be operated by persons who are
capable 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 600 V for measuring category II, and 300 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 pres-
ent.
• 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 9, “Technical Data”, in the table entitled
“Measuring Functions and Measuring Ranges” in the “Over-
load Capacity” column.