Tip:
Highlight text to annotate it
X
To ensure correct results a measurement setup needs to be calibrated.
This means the transducers characteristic curve is adapted to the
amplifier.
At least two reference points are required for calibration.
A linear characteristic curve between the reference points is assumed.
There are three ways of defining the reference points:
The first way is to measure the zero point and enter the sensitivity
specified in the transducers datasheet.
A second way
is to measure the zero point and enter a calibration value.
This calibration value is specified in the transducers calibration certificate.
In this case the sensitivity tolerance is replaced by the much smaller
tolerance of the calibration machine.
Here we want to present a third method for transducer adaptation,
it assumes that no calibration certificate is available.
In this case
the shunt signal that is integrated in all HBM torque flanges is used as a
second reference point.
You need the following components:
a transducer,
for example HBM's T40 digital torque ***, which is powered via the
right-hand connector.
T40 provides a frequency as an output signal via the left-hand connector.
A cable runs from the transducers frequency output to the amplifier.
The box in the center is part of the cable and enables the shunt signal and the
transducer to be activated or deactivated.
This cable has to be used when the amplifier does not have a shunt-release-
function.
QuantumX MX460 is utilized as an amplifier.
The module is specifically designed for precise and dynamic rotational speed and
torque measurement.
Last but not least, we need measurement software.
In our case catman®AP from HBM.
Amplifier and PC are connected to each other via standard ethernet.
We need to take some preparatory steps in catman®AP to enable to transducer
to be calibrated.
First, we create a measurement project in catman®AP.
Catman®AP automatically identifies the QuantumX MX460 amplifier
and the hardware configuration.
The green signal in channel one shows a connected transducer.
The transducer is assigned to the selected amplifier channel, here channel 1, by
selecting the transducer from the catman®AP sensor database.
In our case
the T40 torque transducer from HBM with 1 kilonewton meter nominal rated torque.
Hold the right mouse button down while dragging the selected transducer type to
the channel field.
The transducer name is displayed in channel 1 of the amplifier.
The measurement setup is now already capable of measuring.
We can demonstrate this, for example, by zero balancing or switching to
continuous measurement.
We will now measure the two reference points.
First, we measure the zero point:
We click "measure".
To measure the second value we activate the shunt signal
and click "measure".
The reference signal currently transmitted by the transducer is displayed
and we can enter the corresponding shunt value
which can be found on the transducers type plate,
where it is specified as the calibration signal.
Done. The measurement setup has been precisely calibrated in only a few steps.
The measurement data can now be visualized.
Reliably measuring torque with HBM.
Find more technical articles and information at www.hbm.com .