2-7
IM DL350-03EN
Making Preparations for Measurements
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App
Index
2.4 Installing Input Modules
WARNING
• To prevent electric shock and damage to the instrument, be sure to turn the power off
before you install or remove input modules.
• 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 panel on the slots that are not being used.
Using the instrument without the cover panel 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).
• There are protrusions in the slot. Do not put your hand in the slot. If you put your hand in
the slot, the protrusions may cut your hand.
• Use the accessories of this product within the rated range of each accessory (see page ix).
When using several accessories together, use them within the specification range of the
accessory with the lowest rating.
Precautions to Be Taken When Using the Modules
• Do not apply input voltage exceeding the maximum input voltage or maximum rated voltage
to ground.
• Because the 720211, 720268, 720254, 720250, and 720281 have unbalanced inputs,
parasitic capacitance is present between the L input of the BNC connector or the L
input of the plug-in terminal and the instrument ground. Therefore, when a signal with a
large amplitude is applied to the L input, the maximum rated voltage to ground is limited
depending on the number of input channels and the signal frequency. Be sure not to
exceed the maximum rated voltage to ground for the L input as shown in the graphs in
sections 2.10 and 2.12.
• Establish a functional ground, if necessary, according to section 2.3.
• To prevent the possibility of electric shock, be sure to fasten the module screws. Failing to
do so is extremely dangerous because the electrical and mechanical protection functions
will not be activated.
• Avoid continuous connection under an environment in which the surge voltage may occur.
• To measure high voltage with the 720211 (HS100M12), 720250 (HS10M12), or 720254 (4CH
1M16), use the safety probes (700929, 701947, 702902) or 1:1 safety cables (combination
of 701901 and 701954).
• To measure high voltage with the 720268 (HV (AAF, RMS)), use the combination of
measurement lead 758933 and alligator clip 701954 or the combination of 1:1 safety
adapter lead 701904 and alligator clip 701954.
• To measure high voltage with the 720281 (FREQ), use an safety probe (700929, 701947,
702902).
• Be sure to only use one of the recommended YOKOGAWA logic probes (700986, 700987,
702911, or 702912) with the 720230 (LOGIC).