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3-5
IM 701210-05E
Making Preparations for Measurements
3
3.3
Installing Input Modules
WARNING
• To prevent electric shock and damage to the instrument, make sure to turn OFF
the power before installing or removing the input module.
• Check that the input cable is not connected to the input terminals before
installing or removing the input module.
• To prevent electric shock and to satisfy the specifications, make sure to put the
accessory cover plate on the slots that are not being used.
Using the instrument without the cover plate allows the dust to enter the instrument
and may cause malfunction due to the rise in temperature inside the instrument.
• If the input module happens to come out of the slot while it is in use, it may
cause electric shock or cause damage to the instrument as well as the input
module. Make sure to screw the input module in place at the two locations (top
and bottom).
• Do not put your hand inside the slot, because there are protrusions along the
module guide that may injure your fingers.
• In 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 DL750/DL750P.
• 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 allowable
surge voltage may occur.
• When using the 701250 (HS10M12) or the 701251 (HS1M16) to measure
high voltage, use the isolated probe (700929), 1:1 safety cable (combination
of 701901 and 701954), or the differential probe (700924).
• Be sure to connect the GND lead of the differential probe (700924) to the functional
ground terminal of the DL750/DL750P. High voltage may appear at the BNC
connector of the differential probe. Be sure to connect the GND lead to the DL750/
DL750P before connecting the probe to the parameter to be measured.
• 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. In addition, when measuring high voltage above 42 V, be sure to use
the Passive Probe for the DL750/DL750P (701940)
• The BNC part of the Passive Probe for the DL750/DL750P (701940) is made
of metal. Therefore, use the probe at 42 V or less for isolated inputs (701250
(HS10M12), 701251 (HS1M16), 701260 (HV (with RMS)), 701275 (ACCL/
VOLT), 701280 (FREQ), etc.) for safety reasons. (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 applying high voltage using the 701260 (HV (with RMS)), 1:1 safety
cable (combination of 701901 and 701954) or the isolated probe (700929).
• The measurement category of the 701260 (HV (with RMS)) is 400V-CATII on
the low side and 700V-CATII on the high side. Use caution because the
overvoltage tolerance differs between the low and high sides.
• When applying high voltage to the 701280 (FREQ), use the isolated probe
(700929).