Dranetz DranTech Xtra, User Manual

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26
DranTech X
TRA
User’s Guide
V/Hz,
Ω
, Temperature, and A/Hz Measurements
5 Measurements
5.1 Voltage Measurement
Notes Regarding Voltage Measurement
• The multimeter may only be operated with installed batteries
or rechargeable batteries. 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 permissible voltage between the connector sockets, (9
and 10) and ground (8) is 1000 V for measuring category III, and
600 V for measuring category IV.
• 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 elec-
trical circuits. Dangerous pulsating voltages may be present.
• Be aware of the fact that dangerous voltage spikes are not dis-
played during measurement with the low-pass filter. We recom-
mend 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 Func-
tions and Measuring Ranges” in the “Overload Capacity” column.
Scope of Functions, Voltage Measurement
1)
A 1 kHz low-pass filter can be used in this case, in order to filter out high fre-
quency pulses of greater than 1 kHz, for example when performing measure-
ments at pulsed motor drives.
2)
Input resistance of approx. 1 M
Ω
. Erroneous displays resulting from capaci-
tive coupling during voltage measurement in power supply systems are re-
duced to a minimum in this way.
Function DranTech X
TRA
V AC / Hz TRMS
(Ri
≥
9 M
Ω
)
•
V AC / LP filter 1 kHz
1)
(Ri = 1 M
Ω 2)
) TRMS
•
V AC+DC TRMS
(Ri
≥
9 M
Ω
)
•
V DC (Ri
≥
9 M
Ω
)
•
MHz at 5 V AC
•
Keying ratio as %
•
Freq. response, V AC 20 kHz