Hioki DM7275 Series, Instruction Manual

Page: 158 / 207

158
Functional Specifications
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 coefficient [ppm/°C]
T
0
: Reference temperature
Settings Temperature compensation: ON, OFF
Temperature coefficient: -1000 ppm/°C to +1000 ppm/°C
Reference temperature: -10.0°C to 60.0°C
Default settings Temperature compensation: OFF
Temperature coefficient: 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 coefficient
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 prefixes)
SI prefixes 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 prefix 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 fluctuations in the measurement
circuit. It cannot be disabled.
www. .com
information@itm.com 1.800.561.8187