YOKOGAWA DL850E User Manual page 17

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 DL850E/DL850EV.
• 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.
• Avoid continuous connection under an environment in which the surge voltage may occur.
Precautions to Be Taken When Using the Probes
• To measure high voltage with the 701250 (HS10M12), 701251 (HS1M16), 720210 (HS100M12),
720211 (HS100M12), or 720254 (4CH 1M16), use the isolated probes (700929, 701947),
passive probes 702902, 1:1 safety cables (combination of 701901 and 701954), or differential
probes (700924, 700925, 701926).
• Be sure to connect the ground lead of the differential probe (700924, 700925, 701926) to
the functional grounding terminal on the right side panel of the DL850E/DL850EV before
connecting to the measurement target. Not doing so may cause high voltage to appear in
the BNC connector of the differential probe.
• 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 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.
Install or Use the Instrument in Appropriate Locations
• Do not install or use the instrument outdoors or in locations subject to rain or water.
• Install the instrument so that you can immediately remove the power cord if an abnormal or
dangerous condition occurs.
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.
IM DL850E-03EN
CAUTION
Safety Precautions
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