DigiVisionPC measurement data acquisition software

• Torque measurement < 0.1 Nm
• Speed measurement up to 20000 1/min
• Includes built-in USB port
• High measurement cycle rates
• Visualization and data logging in one measurement step

Task

Das Reibmoment an gefetteten Kugellagern soll erfasst werden. The torque is applied using a variable-speed controlled asynchronous AC motor. Depending on the amount of grease in the ball bearing, the motor is run at different speed levels for various time intervals in order to obtain continuous measurements of the friction torque.

Specific Requirement

Protokollierung der Messdaten über die integrierte USB-Schnittstelle. 

Solution

Das Reibmoment wird im Dauerlauf kontinuierlich vom Drehmomentsensor Typ 8661 erfasst und via USB-Schnittstelle an die PC-Software DigiVision zur Visualisierung und Protokollierung übergeben. 

• Measurements transferred via RS232/RS485
• Min/Max value display
• Powerful software for recording and archiving measurement data

TASK

The requirement is to calibrate equipment in calibration laboratories under precisely defined environmental conditions. These rooms are air conditioned in order to ensure specific environmental conditions. Parameters such as temperature, air pressure and air humidity still need to be constantly monitored and logged, however. This is the job of a PC, which receives the relevant data via an RS232 interface.

SPECIFIC REQUIREMENT

Recording data on the PC from various sensors. Archiving measurement data for post-analysis.

SOLUTION

Digital indicators (model no. 9180) are used to record environmental readings at a total of 12 positions. The digital indicators transfer the recorded data to a converter via the built-in RS485 interface. The converter then converts the data into a form that can be read by the PC via its RS232 port. In the PC, the DigiVision software logs and visualizes this measurement data. DigiVision can process up to eight channels at once. To be able to capture 12 measurement points simultaneously requires the use of the controller communication tool.
This works as follows:
The user creates two device lists, each containing six devices. Then using the free TCP IP controller communication tool, the user creates a special macro. The tool loads the first of the two device lists and starts and stops the measurements. The tool then repeats this process with the second device list. The entire measurement routine can be repeated continuously under timer control.

• Plug&Measure software system with auto-scaling function
• Quick to put in operation
• Mathematical formula editor
• Numerical or graphical display of results
• Free driver package can be used for interfacing with LabVIEW or for integrating custom software
• Dual-range sensor

TASK

Miniature electric motors need to be intensively tested after final assembly in serial production to assess their electromechanical properties. This testing involves measuring torque and speed to assess subsequent mechanical power values. The test setup is required to provide high levels of precision, straightforward measurement-signal processing and overload protection. 

SPECIFIC REQUIREMENT

• Rugged design
• Strong overload protection
• High reproducibility
• Low moment of inertia
• Measurement data available in digital form
• Two separately calibrated measurement ranges

SOLUTION

The low torques in this application mean that the measurement range must be chosen to achieve the necessary accuracy and overload protection. 

The dual-range model of the 8661 torque sensor is permanently mounted between two full couplings: between sensor and drive and between sensor and transmission arm. These couplings are designed to correct vertical and angular misalignments and differences in length.
The torque and speed measurement signals are output via the built-in USB port for further processing. The DigiVision software, which is included with the sensor, can be used not only to capture, visualize and archive the measurement data but also to calculate the mechanical power.

• Integral angle measurement
• Linearity error as low as 0.05 % F.S.
• DigiVision Plug & Measure PC software supplied as standard
• LabVIEW interface or alternative driver package for integrating in-house software available at no extra cost
• Dual-range sensor

Task

Actuation torques of motor starters need to be recorded during serial production. The aim is to log consistent product quality over a prolonged period. This requires storing raw data in a file that can be accessed later for analysis. Anything blocking the toggle switch can result in inadmissible spikes in the torque.

Specific Requirement

• Continuous storage of measured values
• High measurement accuracy with low linearity error
• A faulty end product can cause overload

Solution

Precision torque sensor model 8661 is selected because of the  need for high measurement accuracy and a PC interface. The DigiVision PC software stores the measurement signals in their raw, unprocessed form, so that they can be accessed later by analysis software. The user is provided with both the torque signal and the angle signal. This association is important in helping to identify any faults in the product under test. An adjustable safety coupling is used to prevent damage to the torque sensor 8661 in the event of an overload caused by obstruction of the toggle switch. This coupling not only provides protection but is also able to correct any misalignments.

• Rugged design
• Torque/speed/power calculation
• High measurement accuracy
• High speed
• Instantaneous measurement of starting torque

TASK

The task is to test the motor performance of an industrial fan used for air purification and ventilation. Similar to testing an engine, this test setup is designed to measure the torque, speed and power.

SPECIFIC REQUIREMENT

• Stable performance in exposed mounting position
• High measurement accuracy
• Real-time acquisition of torque and speed
• PC-based analysis
• Zero-maintenance operation, ideal for inaccessible installation locations

SOLUTION

The 8661 torque sensor is permanently mounted between two couplings: between drive and rotor. These couplings are designed to correct vertical and angular misalignments and differences in length. The torque and speed measurement signals are available to the user for further processing. The optional USB interface can be used with the application-oriented DigiVision software for analysing the measurements. In addition to capturing, visualizing and archiving the measurement data, this software can also be used to calculate the mechanical power.

• Extremely fine 0.09° angular resolution
• Axial load
• Bidirectional torque measurement
• Rugged design
• Sampling rate up to 1 kHz

TASK

The task is to measure the static and dynamic torques in a test setup for a fan. An 8661 torque sensor, and specifically the dual-range model, was selected for the task, because not only can it measure the torque of the rotor drive in widely-spaced ranges at two speed levels but it can also provide extremely accurate readings.

SPECIFIC REQUIREMENT

• Static and dynamic torque measurements
• High angular resolution
• Rugged design using durable and low-friction sensor bearings
• High sampling rate because of the different operating states
• Precise measurement of clockwise and anticlockwise torque

SOLUTION

The 8661 torque sensor measures the rotating and static torque at two positions. A torque/speed/power calculation is performed for the rotating torque. The optional USB interface can be used with the application-oriented DigiVision software for analysing the measurements. 
The reactive torque and rotational angle are measured for the static torque. The dual-range model of the 8661 torque sensor is available with a choice of range factors (1:4, 1:5 and 1:10) or a custom factor. Dual-range sensors allow measurements in an additional measurement range which is narrower but has high measurement accuracy.