Hioki RM3542-50, Instruction Manual

Page: 47 / 234

3.8 Confirming Faulty Measurements
41
3
Measurement Fault Detection Order
Out-of-Range Detection Function
Examples of Out-of-Range Faults
Current Monitor Function
The instrument supplies constant measurement current through the measuring object via the H
CUR
and L
CUR
probes. A current monitor fault occurs if constant current cannot be attained. If the contact check and voltage
level monitor results are normal, the out-of-range and comparator result displays indicate "Hi".
Example of Current Monitor Fault
• Broken DUT (open work)
• H
CUR
or L
CUR
probe contact fault
• H
CUR
or L
CUR
cable break
Measurement Fault Detection Display EXT.I/O
Measurement fault detection
proceeds in the order shown
at the left, ending with display
of the first detected error.
Corresponding measure-
ment fault signals are also
output at the EXT. I/O con-
nector.
Probe short-circuit
ERR: 021
PRB_SHORT output,
ERR output
Yes
Hi Wiring Contact Error
C.E. Hi
ERR output, CE_HI
output
Yes
Lo Wiring Contact Error
C.E. Lo
ERR output, CE_LO
output
Yes
Voltage Level Monitor Error
C.E. Volt
ERR output
Yes
Constant-Current Error
+OvrRng
HI output
Yes
Below Lower Limit
-OvrRng
LO output
Yes
Above Upper Limit
+OvrRng
HI output
Yes
No Measurement Data
- - - - - - - -
Yes
No
No
No
No
No
No
No
Out-of-Range Detection Measurement Example
The measurement value is outside
of the measurement range.
10 k
Ω
range is used to measure 13 k
Ω
.
The relative tolerance (%) display
of the measurement value exceeds
the display range (999.999%).
Measuring 500
Ω
(+2400%) with a reference value of 20
Ω
The zero-adjusted value is outside
of the display range. 1 In the 1
Ω
range with 0.5
Ω
zero-adjustment in effect, measuring 0.1
Ω
pro-
vides a zero-adjusted value of -0.4 Ω , which is outside of the display range.
While measuring, input voltage ex-
ceed the A/D converter input range.
Measuring a large resistance value in an electrically noisy environment