Yokogawa Button Operated MV2000 - Manual (Page 13)

2-3
Troubleshooting
SM MV1000-01E
1
2
3
4
5
6
7
2.1 Failure Analysis Flow Chart
Is the input wiring correct?
Is a constant ambient
temperature maintained?
Have appropriate measures
against noise been taken?
Are the range, span, and other
input settings appropriate?
Does the input meet the
input specifications?
Problems related to measurement
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
Ensure that the input
specifications are met.
Set them correctly.
• Enter range, span, and other
input settings that are
appropriate.
• When using the calibration
correction function, check the
settings for the calibration
correction.
• Keep input wires and cables
away from noise sources.
• Be sure to ground the recorder.
• Ground the measured object
properly.
• For thermocouple measurement,
insulate points of contact
between the measured object and
thermocouple.
• Use shielded cables for input
wiring.
• Change the integral time setting
of the A/D converter.
• Use moving average on the input.
• Attach input terminal covers.
• To avoid temperature changes in
the vicinity of input terminals,
keep fan ventilation holes clear,
and keep hot objects away.
• Ensure correct polarity when
wiring.
• Check that terminal wires are
securely connected.
• Do not ground RTDs.
• Replace broken thermocouples.
• Do not connect other instruments
with thermocouples in parallel.
If you must connect it in parallel,
consider using a double element
thermocouple, refraining from
using burnout detection, or
implementing other measures.
• Use one earth connection when
connecting the MV to another
instrument.
Are the RJC
settings and TC, RTD type
settings correct?
See No. 6 of the checklist
in section 2.2.
YES
NO
Are other instruments
connected in parallel?
NO
YES