Hioki 8847 - Measuring Logic Signals

2.2 Connecting Cords
26
Before connecting a logic probe to the measurement object
Use to connect: Logic Probe
• 9320 Logic Probe
*
• 9320-01 Logic Probe
• MR9321 Logic Probe
*
• MR9321-01 Logic Probe
• 9327 Logic Probe
*: Use 9323 Conversion Cable for con-
nection.
LOGIC terminal
Measuring Logic Signals
Applicable Input Modules
• 8973 Logic Unit
LA to LD are supplied as standard equip-
ment with the unit.
To avoid electric shock and short circuit accidents or damage to the instru-
ment, pay attention to the following:
• The ground pin in the LOGIC connector (plug) of the Model 9320-01 and
9327 Logic Probes (and legacy Models 9306 and 9320) is not isolated
from this instrument’s ground (common ground).
Use grounding-type polarized power cords for the measurement object
and this instrument, and obtain power from the same mains circuit.
Connecting to different mains circuits or using a non-grounding power
cord may cause damage to the measurement object or this instrument
because of current flow through the logic probes resulting from potential
difference between the grounds of the different wiring systems.
To avoid these problems, we recommend the following connection pro-
cedure:
• Maximum logic probe input voltages are as follows. Do not measure if
the maximum voltage would be exceeded, as damage the instrument or
personal injury may result.
Model 9327 Logic Probe: +50 VDC
Model 9320-01 Logic Probe: +50 VDC
Model MR9321-01 Logic Probe: 250 Vrms (HIGH range), 150 Vrms (LOW
range)
Do not allow the metal tip of a logic probe to cause a short between conduc-
tors on the measurement object. Never touch the metal tip of a probe.
Measurement
Object
Memory
HiCorder
Logic probe
Logic probe
Functional Earth Terminals
GND
Connect this instrument to the same
outlet as the measurement object us-
ing the (supplied) grounding polar-
ized power cord.
Connect the measurement object’s
ground to the GND terminal of this in-
strument. (Always obtain power from
the same mains circuit.)
"GND Terminal (Functional Earth)"
(
 p.10)
Memory
HiCorder
Measurement
Object