3.7 Displaying Measurement Results
32
3.7.1 Measurement Fault Detection
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
connector.
See Section 5.2.4 ERR Output (Page 73).
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 Ω with the 300 mΩ range
selected.
• If any of the following is open, or has a bad connection: SOURCE-
H, SOURCE-L, SENSE-H, SENSE-L
• When the resistance between SOURCE-H and SOURCE-L is 50 Ω
or more in the 300 mΩ range (or 500 Ω or more in the 3 Ω range)
• When the resistance between SENSE-H and SENSE-L is greater
than about 20 Ω. (However, if the capacitance of the test leads is 1
nF or higher, the measurement fault may not be detected.)
• When a bad contact results from damage, excessive wear or
impurities on the test leads.
• If the circuit protection fuse is blown
See Section 9.1 Troubleshooting (Page 163).
3.7.2 Overflow Display
Overflow is indicated by “OF” or “-OF” on the display, caused by one of
the following:
Display Condition
OF
• The measured value exceeds the limit of the current
measurement range
• When the result of relative value calculation is larger
than +99.999%.
-OF
• The measured value is below the limit of the current
measurement range
• When the result of relative value calculation is smaller
than -99.999%.
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