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IM 701210-05E
3.11 Connecting Logic Probes
CAUTION
• Applying a voltage exceeding the value indicated below may damage the logic
probe or the DL750/DL750P. If the frequency is above 1 kHz, damage may
occur even when the voltage is below this value.
Maximum input voltage (at a frequency of 1 kHz or less)
High-Speed Logic Probe (700986): 42 V (DC+ACpeak)
Isolated Logic Probe (700987):
250 Vrms (except ACpeak is less than or
equal to 350 V and DC is less than 250 V)
• On the high-speed logic probe, the 8 input lines on each POD have a common
earth. In addition, the earth for the instrument and the earth for each POD are
also common. Do not connect inputs which have different common voltages, as
doing so may cause damage to the DL750/DL750P, logic probe, or other
connected instruments.
• Each input terminal of the isolated logic probe is isolated from all other input
terminals and the isolated logic probe is isolated from the DL750/DL750P.
• Make sure to turn off the instrument before connecting or disconnecting the 26-
pin connector from the logic input connector.
• Do not stack the isolated logic probes during use. Also, allow enough space
around the probes to avoid a temperature increase inside the probes.
Logic Input Connector
Connect the logic probe (700986 or 700987) to either of the logic signal input connectors
(marked LOGIC A and LOGIC B).
About the Logic Probe
Types of Logic Probes
There are two types of probes available for connecting to the logic input connector of the
DL750/DL750P.
• High-Speed Logic Probe (700986)
• Isolated Logic Probe (700987)
Types of Measuring Leads That Can Be Used
Use the following leads to connect to the point of measurement.
• Types of Connecting Leads That Can Be Used on the High-Speed Logic Probe
(700986)
The following two types are available.
• Connecting lead (alligator clip, parts No. B9879PX)
This lead is mainly used for connecting contact circuits. The lead consists of 8
signal lines (red) and 8 earth lines (black).
• Connecting lead (IC clip, parts No. B9879KX)
This lead is mainly used for connecting electronic circuits. The lead consists of 8
signal lines (red) and 2 earth lines (black).