30
5. Calibration
Connecting the unit with a strain gauge transducer and
setting how the indicator values will be shown is called "cali-
bration". The following three calibration methods can be used
with the unit.
1. Equivalent input calibration
This calibration method does not depend on actual loads. It
only requires the input of the strain gauge transducer rated
output (mV/V) and the rated capacity (value you want shown).
Use this to calibrate easily when an actual load cannot be
applied.
Examples:
Weight
100kN rated capacity, 2.001mV/V rated output
Pressure
10.00MPa rated capacity, 2.002mV/V rated output
Torque
15.00N·m rated capacity, 2.502mV/V rated output
In this manner, by recording values from test results tables, the
gain can be determined automatically and shown.
2. Actual Load Calibration
This calibration method measures the values of actual loads on
the strain gauge transducer.
By applying an actual load that is as close as possible to
the maximum measured value, calibration with less error is
possible.
3. TEDS calibration
This calibration method uses the strain gauge transducer rated
output (mV/V) and rated capacity that are recorded in TEDS
memory.
Note, however that equipment with TEDS memory includes
both 1kbit and 4kbit devices, but the unit only supports 4kbit.
Sensor check before calibrating
After connecting a sensor and turning the unit on, calibration
is not possible if the indicator value is unstable or an error
appears. If this occurs, press and hold the STRAIN button to
enable static strain mode, and check the indicator value. In this
mode, the sensor output itself is shown as a strain amount unit
(μst), so input between 0 and ±5.0 mV/V will be shown as a
value from 0 to ±10000.
A strain gauge transducer should have written test results with contents such as the following.
Rated capacities: weight, pressure, etc. (unit: kN, MPa, etc.)
Rated output: voltage (unit: mV/V)
Nonlinearity: %R.O.
Hysteresis: %R.O.
Maximum excitation voltage: V (bridge voltage)
Input terminal resistance: Ω
Output terminal resistance: Ω
Zero balance: %R.O.
o
The data necessary for equivalent input calibration are rated capacity and rated output.
o
Some of this data is written to the internal memory of the TEDS sensor.
Содержание TD-01 Portable
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Страница 64: ...64 14 External drawings 140 68 35 85 Dimensions in millimeters mm ...
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