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Measurement issues
Issue
Measured values are
unstable.
Measured values differ
from expected values.
(A negative value is
shown.)
Items to check
Noise may be affecting measurement.
Measurement
Clip-type leads
leads
Wiring becomes two-
terminal wiring in middle.
Wide or thick
Measurement
target
Temperature is unstable (just
manufactured, just opened,
being held by hand, etc.).
Low heat capacity
Transformer, motor, choke
coil, solenoid
TC
ON
OFF
OVC
OFF
Using multiplexer unit to perform scan
measurement
Zero
ON
adjustment
OFF
Scaling
ON
function
Measurement leads
See "Measured values are unstable." (p. 1 2).
HIOKI RM3545E965-00
Possible causes
See: Instruction Manual "4.9 Switching to Pure
Resistance Mode (PR)"
See: Instruction Manual "14.7 Unstable Measured
Values" (3)
See: Instruction Manual "14.7 Unstable Measured
Values" (12)
See: Instruction Manual "14.7 Unstable Measured
Values" (4)
See: Instruction Manual "14.7 Unstable Measured
Values" (5)
See: Instruction Manual "14.7 Unstable Measured
Values" (6)
See: Instruction Manual "14.7 Unstable Measured
Values" (9) and (10)
Instruction Manual "14.9 Mitigating Noise" (1)
The temperature
sensor is not
appropriately
positioned.
The measurement
target's resistance
value is changing due
to the temperature, for
example because the
room temperature has
not stabilized.
The measurement is
affected by thermal
EMF.
Delay is inadequate.
Zero adjustment is not
accurate.
Values are being
affected by route
resistance or
thermoelectric power
due to two-terminal
measurement.
The offset setting is
incorrect.
The measurement
leads are not
connected properly.
12
Solutions
• Move the temperature sensor
closer to the measurement
target.
• Position the temperature
sensor so that it is not
exposed to wind.
• If the response to the
measurement target's
temperature change is
slower than the temperature
sensor's response, increase
the response time by
covering the temperature
sensor with something.
The temperature sensor's
response time is about
10 minutes (reference value).
Turn ON temperature
correction (TC).
Turn ON the OVC function.
Set the delay longer.
Perform zero adjustment
again.
Perform zero adjustment.
Turn scaling off, or
reconfigure the setting
properly.
Check the connections.
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