21
Calibration shown in this document is the process of adjusting
parameters to determine a reading to be displayed on the
TD-260T when a strain gage sensor is connected. The following
three calibration methods are available in the TD-260T.
1. Equivalent input calibration
It is a simple calibration method that requires not the use
of an actual load, but only the key entry of the rated output
(mV/V) and rated capacity (value you want to display) of a
strain gage sensor. With this method, you can easily perform
a calibration if an actual load cannot be applied.
Examples:
In case of load, enter:
100 kN for the rated capacity and 2.001 mV/V for the
rated output
In case of pressure, enter:
10.00 MPa for the rated capacity and 2.002 mV/V for the
rated output
In case of torque, enter:
15.00 N · m for the rated capacity and 2.502 mV/V for the
rated output.
As shown above, enter values specified on a test report so
that the TD-260T automatically determines and displays a
gain.
2. Actual load calibration
It is a calibration method that requires you apply an actual
load to a strain gage sensor and then measure it.
For accurate calibration, which minimizes errors, you need
to apply a load that is close to the sensor's maximum
measurable value.
3. TEDS calibration
It is a calibration method that uses data on the rated output
(mV/V) and rated capacity of a strain gage sensor both
stored in the TEDS memory.
The TEDS memory is available in 1-kilobit and 4-kilobit sizes.
Note that the TD-260T supports the 4-kilobit memory only.
6. Calibration
Checking a sensor before calibration
Calibration cannot be done if the TD-260T displays an
unstable reading or error when you connect a sensor to
the TD-260T and then turn it on. In that case, set the TD-
260T to the static strain mode by performing Static Strain
Mode (F3-7), and then check a reading on the display again.
In this mode, the output from the sensor is displayed in
microstrains; the displayed output is 0 to ±6400.0 for the
input of 0 to ±3.2 mV/V.
CAUTION
The terminals (1 and 2) on the signal input/output terminal
block can be used as either remote sense terminals or
the TEDS sensor data terminals. Before connecting a
sensor, you need to change the setting for Remote Sense/
TEDS (F2-6) to match the function you are going to use.
The initial setting is 0.Aut: TEDS auto-calibration (disable
remote sense). For detailed information, see the section 6-1-
2. “Remote Sense/TEDS.”
The test report included with a strain gage sensor provides the following information.
Rated Capacity: load, atomospheric 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: x10-6 strain (microstrain)
<
Data required for equivalent input calibration are rated capacity and rated output.
<
TEDS sensor has the above data saved in its internal memory.