2-17
IM DLM3054-03EN
Measurement Preparation
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6
App
Index
2.6 Connecting Logic Probes
WARNING
• When connecting a device under measurement to the instrument, be sure to turn off the
device.
• Do not apply voltage exceeding the maximum input voltage.
• To avoid electric shock, be sure to ground the instrument. Furthermore, connect the ground
of the probes or input connectors to the ground potential of the device under measurement.
The ground of each signal input terminal (input connector) of this instrument is common
with the instrument’s protective ground (see the block diagram in appendix 3). Do not apply
floating potential signals to the input connector ground. This is extremely dangerous as
doing so will cause a short to the ground potential.
CAUTION
• The maximum input voltage for the 701989 logic probe is ±40 V (DC + ACpeak) or 28
Vrms, and the maximum input voltage for the 701988 logic probe is ±42 V (DC + ACpeak)
or 29 Vrms. Applying a voltage greater than either of these limits may damage the logic
probe or the instrument. If the frequency is high, damage may occur even if the voltage is
below the values specified above. For information about derating based on frequency, see
the user's manual of the logic probe that you are using.
• The eight input lines on the logic port have a common ground. In addition, the ground for
the instrument and the ground for the logic port is also a common ground. Do not apply
signals with different common voltages. Doing so may damage the instrument, connected
logic probes, and connected devices.
• For information about how to handle a logic probe, refer to the user's manual that came
with the logic probe.
