Hioki BT4560 - Page 135

A5
Cautions When Making Your Own Measurement Probe
• For the shape and position of the measurement probe, give attention to the points in the Figure shown below.
Eddy currents from adjacent metal bodies or exogenous inductive noise may cause errors and variations in
the measurement value and worsen the repetitive accuracy. (The following measures can be used to reduce
these effects.)
SOURCE-H SOURCE-LSENSE-LSENSE-H
Connect the SOURCE-H
shield and the
SOURCE-L shield
• Make the loop area between the SOURCE shield and the measurement battery as small as possible.
• Set the loop shape and the wiring position (a distance to the metal part of the surrounding inspection
device) in the normal condition.
Measuring object battery
+
terminal
-
terminal
Shield You must not place the metal part close to the following
parts (device frame).
• The periphery of the probe pin
• The periphery of the cable that is not covered with
the shield
Keep the contact position of SENSE as far away
from the SOURCE line as possible.
• The wiring cable should be of minimum length. (less than 4 m) A longer wiring cable is easily affected by
exogenous inductive noise. The return wiring resistance and the contact resistance must be less than the
allowable values respectively.
• Perform zero adjustment before measurement. Perform zero adjustment using the zero adjustment board that
corresponds to the terminal spacing.
• You must not use a metal plate (short bar) as the zero adjustment jig. If a metal plate is used, the correct zero
adjustment cannot be performed and then a large error will occur in the measurement. For details, refer to “Zero
Adjustment” (p. A8).
Set the following to the same conditions as those when measuring.
• Loop area
• Loop shape
• Probe spacing
• Wiring position (distance to the surrounding metal part of a device)
10
9
8
7
6
5
4
3
2
1
Appx. Ind.