Hioki RM3545, Инструкция по эксплуатации, Страница: 74 / 364

4.2 Switching Measurement Currents (100 m
Ω
to 100
Ω
)
66
Power equivalent to the resistance value × (measurement current)
2
will be applied to the
measurement target. If there are any of the following concerns, depending on the level of
the measurement current, set the measurement current to low.
•
The measurement target may melt (such as a fuse or inflator).
•
The measurement target may heat up, causing a change in resistance.
•
The measurement target may be magnetized, causing a change in inductance.
See: "3.1 Checking the Measurement Target" (p.48)
Because the detection voltage decreases when the measurement current is Low, measure-
ment is more susceptible to external noise. If measured values fail to stabilize, take steps to
address the noise, referring to "Appendix 7 Unstable Measured Values" (p. A12). The fol-
lowing four steps are particularly effective in this situation:
•
Shield the measurement cable (connect the shielding to the instrument’s GUARD termi-
nal).
•
Twist the measurement cables together.
•
Shield the measurement target (connect the shielding to the instrument’s GUARD termi-
nal).
•
Decrease the measurement speed or use the averaging function.
4.2 Switching Measurement Currents
(100 m
Ω
to 100
Ω
)
Range
High Low
Measurement
current
Maximum power
in measurement
range
Measurement
current
Maximum power
in measurement
range
10 m
Ω
1 A 12 mW
−
100 m
Ω
1 A 120 mW 100 mA 1.2 mW
1000 m
Ω
100 mA 12 mW 10 mA 120
μ
W
10
Ω
10 mA 1.2 mW 1 mA 12
μ
W
100
Ω
10 mA 12 mW 1 mA 120
μ
W
1000
Ω
1 mA 1.2 mW
−
10 k
Ω
1 mA 12 mW
−
100 k
Ω
100
μ
A 1.2 mW
−
1000 k
Ω
10
μ
A 120
μ
W
−
10 M
Ω
1
μ
A 12
μ
W
−
100 M
Ω
(high-
precision mode:
ON)
100 nA 1.2
μ
W
−
100 M
Ω
, 1000 M
Ω
(high-
precision mode:
OFF)
1
μ
A or less 1.3
μ
W
−