31
4. Settings
4-3. Load cell 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:
Load
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 reports, 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.
A strain gauge transducer should have written test results with contents such as the following.
Rated Capacity: load, barometric pressure, etc. (with units of kN, Mpa, etc.)
Rated Output: voltage (unit: mV/V)
Linearity: %R.O.
Hysteresis: %R.O.
Safe excitation voltage (maximum): 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.
Sensor check before calibrating
After connecting a sensor and providing power, calibration
is not possible if the indicator value is unstable or an error
appears. If this occurs, enable static strain display 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
±3.2 mV/V will be shown as a value from 0 to ±6400.
NOTE
To show static strain, touch the buttons in the following order.
⚙
e
CALIB. & SYSTEM
e
SYSTEM
e
TEST & INFO
e
STATIC STRAIN DISP.
EXECUTE
Overview of zero balancing and digital
zero functions
1. Zero balancing value definition
This is the value for which zero balancing is conducted during
the sensor calibration procedures in this chapter.
2. Digital zero (D/Z) value definition
The Digital Zero (D/Z) function can be used to show zero sepa-
rately from the zero balancing value.
Depending on the setting, the zero value might not be retained
when the power is restarted.
Name When power restarted
Digital zero (D/Z)
value
The set zero value is reset, and the zero
balancing value is shown.
Zero balancing
value
The set zero value is retained.
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