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IM DL850-03EN
Precautions to Be Taken When Using the Modules
• Do not apply input voltage exceeding the maximum input voltage, withstand voltage, or
allowable surge voltage.
• To prevent the possibility of electric shock, be sure to furnish protective earth grounding of
the DL850/DL850V.
• To prevent the possibility of electric shock, be sure to fasten the module screws. Otherwise,
the electrical protection function and the mechanical protection function will not be
activated.
• Do not leave the instrument connected to devices in an environment that may be subject to
voltage surges.
Precautions to Be Taken When Using the Probes
• When measuring high voltages using the 701250 (HS10M12) or 701251 (HS1M16), use an
isolated probe (the 700929 or 701947), 1:1 safety cable (a combination of the 701901 and
701954), or differential probe (700924).
• Be sure to connect the GND lead of the differential probe (the 700924) to the functional
ground terminal of the DL850/DL850V. High voltage may appear at the BNC connector of
the differential probe. Also, be sure to connect the GND lead to the DL850/DL850V before
you connect to the device under measurement.
• When using the 701255 (NONISO_10M12), be sure to fasten the module screws.
Fastening the module screws activates the protection function and the non-isolation
function. It is extremely dangerous if you do not fasten the screws. Also, when you measure
high voltages above 42 V, be sure to use the passive probe (the 701940).
• The BNC portion of the passive probe (701940) is metal, so if you use it with isolated input
(the 701250 (HS10M12), 701251 (HS1M16), etc.), for safety, be sure to only use it with
voltages at or below 42 V.(Do not connect voltage above 42 V to both the High and Low
sides.)
For non-isolated inputs (701255 (NONISO_10M12), etc.), fasten the module screws as
described before.
• When you apply high voltages to the 701267 (HV (with RMS)), use a measurement lead
758933 and alligator clip 701954.
• The measurement category of the 701267 (HV (with RMS)) is 400V-CAT II on the low side
and 700V-CAT II on the high side. Use caution because the overvoltage tolerance differs
between the low and high sides.
Measurement Category
The measurement category of this instrument’s signal input terminals varies depending on the
modules that are installed. Use the instrument within the scope of the measurement category
that corresponds to the module specifications. Do not use the instrument outside the scope of
the measurement category that corresponds to the module specifications.
Installation Location
• This instrument is designed to be used indoors. Do not install or use it outdoors.
• Install the instrument so that you can immediately remove the power cord if an abnormal or
dangerous condition occurs.
CAUTION
Operating Environment Limitations
This product is a Class A (for industrial environments) product. Operation of this product in a
residential area may cause radio interference in which case the user will be required to correct
the interference.
Safety Precautions