Hioki RM3542-50, Instruction Manual

Page: 46 / 234

3.8 Confirming Faulty Measurements
40
When a measurement is not performed correctly, a measurement fault indicator appears and a
measurement fault signal is output at the ERR pin of the EXT. I/O connector (except for out-of-range
detection).
The instrument detects measurement faults by the following four methods.
3.8 Confirming Faulty Measurements
Appears when the measurement value is outside of the measurement or display range.
Check for a broken sample component.
The comparator result is Hi when +OvrRng is displayed, and Lo when -OvrRng is displayed.
No external measurement fault signal (ERR) is output.
Measurement out of range
The resistance between the H
POT
and H
CUR
probe contacts, and between the L
POT
and L
CUR
probe contacts, are measured and compared with specified contact fault values.
An error message appears when the measurement value reaches or exceeds the specified contact
fault values.
If this error persists, probe wear or cable failure may be the cause.
If the error is not cleared by shorting the tips of a known-good measurement probe, the instrument
requires repair.
Contact Check Fault
This method monitors the stability of the voltage between H
POT
and L
POT
probe contacts.
An error message appears when voltage instability is detected due to chattering of the probe con-
tacts.
If this error is displayed frequently, the probes may be degraded due to wear.
C.E. Volt may also be displayed when external noise is strong.
Voltage Monitor fault
See: "Out-of-Range Detection Function" (p. 41)
See: "4.5 Checking for Poor or Improper Contact
(Contact Check Function)" (p. 50)
See: "4.7 Detecting Measurement Voltage Faults
(Voltage Level Monitor Function)" (p. 55)
This display appears after changing measurement settings and before the next measurement is
performed. - - - - - - -
Display Examples: Display Measurement State and Appearance with Open-Circuit Probe
Display Measurement State
Current Monitor Results
Normal (PASS) Fault (FAIL)
Contact Check Results
Voltage Level Monitor
Results
Normal
(PASS)
Display: Measurement Value
COMP indicator: According to the
measurement value Display: +OvrRng/ -OvrRng
COMP indicator: Hi/ Lo
(when connection to the measuring
object is broken)
Fault
(FAIL)
Display: C.E. Hi/ C.E. Lo/ C.E. Volt
COMP indicator: No judgment
EXT.I/O: ERR signal output
Display: C.E. Hi/ C.E. Lo/ C.E. Volt
COMP indicator: No judgment
EXT.I/O: ERR signal output
+OvrRng
-OvrRng
C.E. Hi
C.E. Lo
C.E. Volt
Display
Display
Display
This method monitors the regulated measurement current for normal flow through the measuring object.
An error is detected mainly when a measurement fault occurs due to an open measuring object or poor contact be-
tween the H
CUR
and L
CUR
probes.
The error display depends on the contact check and voltage level monitor states (refer to the table below).
Current Monitor Fault
See: "Current Monitor Function" (p. 41)
The measurement fault display differs according to detection order and settings.