Hioki DM7275 Series - Page 83

80
Correcting Measured Values
Compensating the effects of temperature (temperature compensation
function)
This function converts the voltage measured value to the voltage at a specic temperature (the
reference temperature) using a user-dened temperature coefcient and displays the result. The
temperature dependency of voltage varies greatly with the measurement target. Before using this
function, measure the measurement target’s temperature characteristics.
The voltage values
V
T
and
V
T0
can be expressed as the voltage values of a measurement target at
T
°C and
T
0
°C (where the temperature coefcient at
T
0
°C is
α
T0
):
( )
( )
996004.3
2030101001
4
1
6
0T0
T
T0
=
−××+
=
−+
=
−
TT
V
V
α
V
T
: Observed voltage value [
Ω
]
T
: Current ambient temperature [°C]
V
T0
: Voltage value after correction [
Ω
]
T
0
: Reference temperature [°C]
α
T0
: Temperature coefcient at
T
0
[1/°C]
V
T
V
T0
T
0
T
Compensation
Reference
temperature
Current
temperature
Example:
Under the following conditions, the voltage value at 20°C is calculated as shown below:
• Current temperature: 30°C
• Current battery voltage value (at 30°C): 4 V
• Temperature coefcient at 20°C: 100 ppm/°C
( )
( )
996004.3
2030101001
4
1
6
0T0
T
T0
=
−××+
=
−+
=
−
TT
V
V
α
• The temperature sensor only detects the ambient temperature. It cannot measure the
measurement target’s surface temperature.
• Allow the instrument to warm up adequately prior to measurement. Position the temperature
sensor close to the measurement target and allow the temperature sensor and measurement
target to adjust adequately to the ambient temperature before use.
(Measurement screen)
MENU > MATH > TC
1
ConnecttheZ2001TemperatureSensor
to the TEMP.SENSOR connector on the
rear of the instrument (p. 27).
2
Enable the temperature compensation
function.
(Default setting: OFF)
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