Hioki RM3542-50, Instruction Manual

Page: 212 / 234

Appendix 3 Unstable Measurement Values
A
6
(6) The Sample Becomes Warm
The maximum applied power to a measuring object by this instrument is determined as follows.
The resistance of samples with small thermal capacity can change due to heating. In such cases, set the low-
power resistance measurement to ON.
(7) Ingress of External Noise
Measurement should be conducted as far as possible from
devices emitting electric or magnetic fields such as power
cords, fluorescent lights, solenoid valves and PC displays. If
electrical noise ingress is a problem, prepare the measure-
ment leads as shown in Fig. 9.
(8) Measuring Transformers and Motors
If noise enters an unconnected terminal of a transformer or if motor rotor moves, measurements may be
unstable due to induced voltage on the measured winding. Pay attention to the treatment of unconnected ter-
minals on transformers or to motor vibration.
Range
Measurement
current
The maximum applied power
(Measuring object resistance) x (Measurement current)
2
VOLTAGE LIMIT: OFF VOLTAGE LIMIT: ON
100 m
Ω
100 mA 1.2 mW 1.2 mW
1000 m
Ω
100 mA 12 mW 12 mW
3
Ω
33.3 mA 4 mW 4 mW
10
Ω
10 mA 1.2 mW 1.2 mW
100
Ω
10 mA 12 mW 12 mW
300
Ω
3.33 mA 4 mW 4 mW
1000
Ω
1 mA 1.2 mW 1.2 mW
10 k
Ω
1 mA 12 mW 12 mW
30 k
Ω
333 µA 4 mW 1.7 mW
100 k
Ω
100 µA 1.2 mW 0.5 mW
300 k
Ω
33.3 µA 400 µW 170 µW
1000 k
Ω
10 µA 120 µW 50 µW
3 m
Ω
3.33 µA 40 µW 17 µW
10 m
Ω
1 µA 12 µW 5 µW
30 m
Ω
333 nA 4 µW 1.7 µW
100 m
Ω
100 nA 1.2 µW 0.5 µW
LP 1000 m
Ω
10 mA 120 µW 120 µW
LP 3
Ω
3.33 mA 40 µW 40 µW
LP 10
Ω
1 mA 12 µW 12 µW
LP 100
Ω
1 mA 120 µW 120 µW
LP 300
Ω
333 µA 40 µW 40 µW
LP 1000
Ω
100 µA 12 µW 12 µW
Figure 9. Wiring to Minimize Noise Ingress
Twisted
Metal
Cover
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