Hioki ST5520-01 - Influence Of Cable Length; Appx

Appx.6
Inuence of Cable Length
Appx. 5 Inuence of Cable Length
When the instrument is incorporated in a production line or automated machine, the
measurement cable may be extended. When the measurement cable is extended,
measured values can be affected by coupling capacitance between cables or line
noise. The level of inuence on measured values when the measurement cable is
extended is shown below.
For the inuence of a capacitive load, refer to “Appx. 4 Inuence of Capacitive Load”
(p. Appx.4). For the inuence of line noise, refer to “Appx. 6 Inuence of Noise” (p. Appx.7).
Cable: UL1032 AWG18
Twisted wires 75 wires ×
f
0.12 mm (extended optional L2200)
Instrument settings
Test voltage: 1000 V
Resistance range: 4000 M
Ω
range
Load: 3600 M
Ω
+ cable coupling capacitance (approx. 250 pF)
Cable length
Measurement
speed
0.7 m 2 m 3 m 4 m
FAST ±0.1% ±0.4% ±0.7% ±0.9%
SLOW ±0.1% ±0.4% ±0.6% ±0.8%
The values above indicate the repeat accuracy.
Cautions for measurement cable wiring
• When the measurement cable is laid on a metal ground, the inuence of noise can be reduced.
• When the measurement cable is extended, the inuence of power line noise becomes more
signicant. Position the measurement cable away from the power line.
• Position the measurement cable away from any noise sources (motor, welder, inverter, etc.).