LTT24 real time measuring system
LTT24 – The high performance measuring device
Measuring system and measuring amplifier
Application example: the future of battery-driven electric motors
Test standards, such as DIN IEC 60034-2-3, define the test requirements for determining the efficiency of such inverter-fed drives.
The underlying chopped square wave voltage and the associated current must lead to correct phases and amplitudes and a performance statement with a maximum error tolerance of 0.3%. In order to achieve this accuracy of 0.3%, the theoretical frequency consideration of a square wave voltage means that all frequencies up to the 19th Harmonic of the switching frequency of the inverter must be taken into consideration. At a switching frequency of 10-20 kHz this is a signal bandwidth of 0-380 kHz in which the signal fidelity of all components must be better than 0.3%. This requires a measurement technology with a continuous sampling rate of 2-4MHz without distorting filters.
Particularly in high-performance automotive electric motors, increasingly high battery voltages with currently up to 800 V are used. At a bandwidth of 380 kHz, a pulsed 800 V signal shape becomes a real challenge. The challenge is to build the high-voltage divider in such a way that its total measurement error is guaranteed to remain below 0.3% over the entire frequency, voltage and temperature ranges despite the fact the non-linearities of all electronic components already have a massive impact here. At the same time, the pulsating current of this 800 V pulsating inverter voltage must be measured. That is a real challenge for the galvanic isolation of the current input.
The LTT24 is the only device worldwide that successfully combines the required bandwidth and accuracy. No other power meter can meet the signal accuracies required by the standards in terms of voltage AND frequency. Other devices fail to achieve either the required accuracy or the required bandwidth. The LTT24 is the only solution you can rely on to support your test bench design. The sky is the limit!
- Housing size: 4, 8, 16
- also suitable for 19" installations
- Number of channels from 1 to 16 and more
- Expandable at any time
- configurable functionality
- Ultra performance: 24 bits technology with 4 M sample/s per channel
- Best accuracy on the market: 16 ENOB
- Best flat bandwidth on the market: DC – 1.7 MHz
- Best interference suppression (CMRR) on the market
- Best galvanic isolation: No-Noise DC/DC supply with 2 MHz clock pulse
- Suitable sensor supply: Voltage, current, carrier frequency
- Signal inputs for: volt, current, charge, ICP®, strain gage, current, LVDT,
- resistance etc. with corresponding sensor supply
- Slow channels: 24 bits with 2 k sample/s for e.g. temperature, pressures, etc.
- Analog outputs up to 2 MHz and 16 bits resolution
- Digital channels: SPI, pulse etc.
- 1 - 32 analog outputs
- 1 - 256 digital IOs
- Internal Recording: internal SSD hard disk (500 GB)
- Don't ever miss anything important again, just rewind!
- Digital I/O and Syc.-Interface for external hardware
- SyncE and IEEE1588: Nano-second synchronization via Gigabit Ethernet
- USB 3.0 and Dual Gigabit Ethernet connection to PC
Data transfer rate
- SSD 256 Mbytes
- PC via USB 170 Mbytes
- PC via Gigabit interface 127 Mbytes
Request your offer
SL-automation GmbH & Co. KG
Telephone: +49 (0) 731 98588-790
At full speed with highest precision
- 24 Bit AD-conversion at up to 4 MHz sampling rate
- Modular housing concept 4, 8, 12, 16 channel inserts
- Digital measurements accurate to nanoseconds
- Best signal quality (16 ENOB – Effective Number of Bits)
- Flat bandwidth: DC - 1 MHz or 1.7 MHz
- Pulse/counter inputs: 832 MHz ⩠ 1.20 ns resolution
- 20 Bit analog outputs up to 2 MHz
- Digital I/O und Sync.-Interface
- Recording with a PC or an internal SSD (500 GB)
Standard connection with the inputs for volts and current
- Measuring ranges ± 250 mV, ± 5 V, ± 50 V
- optionally ± 200 V as well as ± 50 mA
- 24 bits AD-converter
- Sampling frequency: up to 4 M sample/s per channel
- Bandwidth: DC - 1.7 MHz
- Very low noise: -100 dB to FSR at 1 MHz
- 16 bits ENOB (effective number of bits)