Hioki RM3545, Instruction Manual, Page: 65 / 364

3.5 Checking Measured Values
57
3
*1 Over-range Detection Function
Examples of Over-range Faults
*2 Current Fault Detection Function
Example of Current Fault
•
SOURCE A or SOURCE B probe open
•
Broken measurement target (open work)
•
SOURCE A or SOURCE B cable break, poor connection
SOURCE wiring resistance in excess of the following values may cause a current fault,
making measurement impossible. When using measurement current 1 A ranges, keep the
wiring resistance as well as the contact resistance between the measurement target and
measurement lead low.
Over-range Detection Measurement Example
The measured value is outside of
the measurement range. Attempting to measure 13 k
Ω
with the 10 k
Ω
range selected
The relative tolerance (%) display
of the measured value exceeds
the display range (999.999%).
Measuring 500
Ω
(+2400%) with a reference value of 20
Ω
The zero-adjusted value is out-
side of the display range. Performing zero-adjustment after connecting 0.5
Ω
with the 1
Ω
range
→
Measuring 0.1
Ω
yields a -0.4
Ω
reading, exceeding the display
range.
While measuring, input voltage
exceed the A/D converter input
range.
Measuring a large resistance value in an electrically noisy environment
Current did not flow normally to
the measurement target.
(When the current fault mode set-
ting is set to “Over-range output”
only) When the measurement target yields an open FAIL result
When either the SOURCE A or SOURCE B terminal suffers from poor
contact.
*To display “
- - - - - - - ” when a current fault occurs, set the current fault
mode setting to “Current fault.”(p.59)