Hioki BT3564, Instruction Manual, Page: 42 / 210

3.7 Displaying Measurement Results
36
If a measurement does not execute properly, a measurement fault
“
- - - - - ” is indicated on the display.
In addition, a measurement fault signal (ERR) is output at the EXT I/O connec-
tor.
See " ERR Output" (

p.79).
A measurement fault is displayed in the following cases.
• When a test lead is not connected to the test object
• When the resistance of the measured object is over-range
Example: Attempting to measure 30 W with the 300 mW range selected.
• When there is a break in a probe wire
• When the contact resistance is high due to probe wear, dirt, or other factors,
or when the wiring resistance is high (see chart below)
• If the circuit protection fuse is blown
See "10.1 Troubleshooting" (

p.173).
Levels at which a measurement fault is detected
A measurement result is detected as a fault when the resistance values (contact
resi wiring resi test object resistance) between the source H
and L or the sense H and L leads is greater than or equal to the values in the fol-
lowing table:
*Large contact resistance and/or wiring resistance values may increase the error
component in measured values. (Accuracy is not guaranteed when the sum of
contact resistance and wiring resistance is greater than or equal to 20

[for the
3 m

and 30 m

ranges, 2

].)
*The instrument may be unable to detect measurement faults when the mea-
surement lead capacitance is greater than or equal to 1 nF.
Measurement Fault Detection
Range SOURCE H-L SENSE H-L
3 m

3

3

30 m

3

3

300 m

20

20

3

200

20

30

2 k

200

300

6 k

2 k

3000

6 k

20 k

HIOKI BT3564A961-02