Hioki DM7275-01 - Page 158

158
Functional Specications
Temperature
compensation
Calculation formulas
V
T0
= V
M
/ (1 + α (T-T
0
))
V
T0
: Measured value after temperature compensation
V
M
: Voltage measured value after NULL calculation
T
: Temperature
α
: Temperature coefcient [ppm/°C]
T
0
: Reference temperature
Settings Temperature compensation: ON, OFF
Temperature coefcient: -1000 ppm/°C to +1000 ppm/°C
Reference temperature: -10.0°C to 60.0°C
Default settings Temperature compensation: OFF
Temperature coefcient: 0 [ppm/°C]
Reference temperature: 20°C
Scaling Calculation formulas
V
S
= A × V
T0
+ B
V
S
: Value after scaling
V
T0
: Value after NULL calculation and temperature
compensation
A
: Gain coefcient
B
: Offset
Settings Scaling: ON, OFF
A
: 0 to ±1.000 000 × 10
9
B
: 0 to ±1.000 000 × 10
9
Unit: V, none, 3 characters as desired (not including SI prexes)
SI prexes are automatically adjusted so that the integer
portion of (
A
× maximum display before scaling
+ |B|
) is from
2 to 4 digits long.
Example: For 10 V range,
A
= 1.5 × 10
5
,
B
= -0.5 × 10
3
,
1.5 × 10
5
× 12 + 0.5 × 10
3
= 1800 500
After adjustment so that the integer portion is from
2 to 4 digits long: 1800.500k → SI prex is “k.”
Default settings Scaling: OFF
A
: 1
B
: 0
Unit: V
Over range indication An over range is indicated under the following conditions:
• When the measurement range is exceeded
• When A/D converter input during measurement exceeds the input range
• When the temperature compensation, NULL calculation or scaling results exceed
the display range
Contactcheck
Operation • When the capacitance between HIGH and LOW terminals
is less than the threshold, no detection is made, and no
measured value is displayed.
• On the contact check settings screen, the capacitance
between the HIGH and LOW terminals can be monitored
(monitor range: 0 nF to 60 nF [reference values]).
• This function cannot be used in the 100 V or 1000 V range.
Detection signal 10 mV rms (reference value)
Settings Contact check: ON, OFF
Threshold: 0.5 nF to 50 nF (reference values)
Contact check integration time: 1 ms to 100 ms
Default settings Contact check: OFF
Threshold: 1 nF
Contact check integration time: 10 ms
Self-calibration Operation Self-calibration corrects for uctuations in the measurement
circuit. It cannot be disabled.
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