Sensors & Transducers e-Digest, Vol. 103, Issue 4, April 2009: Product News
General-Purpose Measuring Amplifier LTT500 for dynamic and static sensor signals featuring 8 galvanic isolated DMS strain gauge, Volt, charge, ICP, current and resistance inputs that can be set up separately using dedicated software. There is no need for exchanging modules for different applications as all channels are fully equipped.
Any channel accepts Volt signals, strain gauge configurations (full, ˝ and Ľ bridges), charge sensors, ICP accelerometers, ICP microphones and even resistors. The differential inputs handle voltages from ±1 µV to ±150 V. Integrated current measurements using shunt resistor round off the variety of measurement options.
Bandwidth per channel. Distortion-free from DC to 1 MHz: The LTT500 reaches the 1 MHz mark with an incredible frequency response of ‑0.02 dB (>99.7 %), providing a phenomenally low noise level down to -100dB.
Splash-proof according to IP65. The completely sealed aluminium housing is milled from the solid and IP65 sealed against water and dust. It is very sturdy and usable in crash objects for crash testing.
Possible application areas include the full range of tasks where high signal quality in dynamic and static processes matters, even in harsh environments!
PC interfacing options. To set up the LTT500, the amplifier is connected to a computer via Ethernet or USB interface. The provided software allows for individual setup of each channel. Setup changes are performed within split seconds. The last settings can be optionally stored in the amplifier to allow further operation without computer.
Input channel monitoring: Errors are detected. Sensor or cable defects and signal errors are detected. All channels are monitored for overload, short-circuit, cable break and high thermic load of the sensor supply voltage. Several LEDs per channel provide status information.
Sensor supply with constant current or voltage. The ultra low-noise and high-precision sensor supply can be set individually per channel. There is a choice between constant current and constant voltage. Each channel has its own, galvanic isolated power supply with a maximum load of 2W from the sensor.
AutoZero function. If required, the built-in AutoZero function compensates zero point errors in the connected signal up to +/- 200 % of the selected measuring range.
Charge sensors for high temperatures. Should your measurement task become a hot affair you can just replace the existing sensors with heat-resistant charge sensors. The LTT500 will also amplify these signals with high precision and resolution over a broadband range (0.1 Hz ‑ 1 MHz) Optionally, the LTT500 can tame drifting sensor signals using a range of high-pass filters and apply automatic or time controlled zero corrections.
Quick change from one measuring setup to another. Fully equipped channels featuring all signal conditioning functions eliminate the need for exchanging different input modules and allow connecting any sensor to any input. The time from one setup to another is reduced considerably.
TEDS simplifies commissioning. TEDS technology is today widely accepted for ICP-based sensors. The LTT500 amplifier reads out sensor data from the TEDS chip, thus facilitating the selection of the adequate measuring range. The LTT500 also supports this technology with all other sensor types such as strain gauge bridges.
LTT – Labortechnik Tasler GmbH stands for sophisticated PC measurement technology that is continually improved to provide special solutions for the need of our customers. LTT holds patents worldwide, such as for the method of extremely fast real-time data transfer.
The new LTT500 Measuring Amplifier not only complements the well-established LTT‑product series Transient Recorder LTT184/186 and SensorCorder LTT180/182 with additional signal conditioning features, but also any A/D converter card and front-end already used by the customer.
Minimising the risk of commissioning problems. Every now and then test benches and other measurement systems will reach their technical limits. Enhancements are expensive and time-consuming. Extensive software customisation often involves risks that are identified too late.New software packages mean staff training and start-up issues. With the LTT500, the user will benefit from the wide range of new features without having to customise existing measurement concepts and software packages. The LTT500 can be set up separately and works even without a PC. This will bring down costs and risks to an acceptable level.
Measurement concepts implemented with LTT18x systems. When LTT18x measurement systems and the LTT500 are used together Labview‑drivers or DASYLab10 software offer a comfortable and fast option for integrating measured LTT data into complex test bench programs. Graphical programming using function blocks allows fast creating of test sequences. Furthermore, these systems are eminently well-suited for mobile operation due to sample rates up to 20 MHz per channel and 16-bit precision.
For high channel count systems distributed on many computers, the Gigabit‑Ethernet‑based software LTTproNet sets the benchmark. It offers secure online archiving of LTT data from hundreds of channels together with concurrent visualisation and calculations on numerous PCs and screens. With a press of a button the recorded data can be played back on the network at any time, allowing for post-processing of the original data.
Patented data transfer allows for online visualisation and online storing of measured data in real-time. The recorded data are saved online in commercial file formats such as DIAdem, Famos and NI TDM, ready for post-processing. No tedious data export/import is required. Of course file exports to Matlab, DASYLab and Excel are supported as well. Optionally, the instruments are available with integrated hard disk for stand-alone operation if you want to perform measurements without PC connection.
The integrated online arithmetic of the LTT18x systems allows pre-analysing the measured data already during the measurement. Thus, important decisions on the further procedure can be taken directly. µRemus software from Dr. Sibaei & Hastrich supports the LTT hardware and enables signal analysis, modal analysis, balancing and even an acoustic camera.
LTT Transient Recorders and Sensor Corders are used by well-known customers in the fields of motor development, airbag development, machine and plant engineering, material research at technical universities, military material testing, marine water sound applications, drive train development, component tests, crash tests, turbine power plants, wind power industry etc.
LTT Labortechnik Tasler GmbH
1999 - 2009 Copyright ©, International Frequency Sensor Association (IFSA). All Rights Reserved.