Operating Precautions
17
When using the temperature sensor
• To obtain the guaranteed measurement accuracy, allow at least 60 minutes
warm-up.
• When measuring devices such as power supply transformers with high
inductance or open-type solenoid coils, measured value may be unstable.
In such cases, connect a film capacitor of about 1 F between SOURCE A
and SOURCE B.
• Carefully insulate all SOURCE A, SENSE A, SENSE B, and SOURCE B
wiring. Proper 4-terminal measurements cannot be performed and an error
will occur if core and shield wires touch.
• The SOURCE terminal is protected by a fuse. If the fuse is tripped, the
instrument will display “
Blown Fuse.” and you will not be able to measure
resistance values. If the fuse is tripped, replace the fuse.
See: "14.2 Replacing the Measurement Circuit’s Protective Fuse" (p. 300)
• Since the instrument uses DC current for measurement, it may be affected
by thermal EMF, resulting in a measurement error. If so, use the Offset Volt-
age Compensation function (OVC).
See: "4.8 Compensating for Thermal EMF Offset (Offset Voltage Compensation -
OVC)" (p. 82)
See: "Appendix 9 Effect of Thermal EMF" (p. A23)
The temperature sensor is not waterproof. Do not submerse it in water or
other liquid.
• Allow the measurement target for which temperature correction is being
performed and the temperature sensor to adjust to the ambient temperature
prior to measurement. Failure to do so will result in a large error compo-
nent.
• Handling of the temperature sensor with bare hands may cause the sensor
to pick up inductive noise, resulting in unstable measured values.
• The temperature sensor is designed for use in applications in which ambi-
ent temperature is measured. It is not possible to accurately measure the
temperature of the measurement target itself by placing the sensor in con-
tact with the surface of the target. Use of an infrared thermometer to per-
form correction is appropriate when there is a large temperature difference
between the ambient environment and the measurement target.
• Connect the temperature sensor by inserting the plug all the way into the
TEMP.SENSOR jack. A loose connection may cause a large error compo-
nent in measured values.
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