인덱스티엠_센서응용 Data Logger 전문회사

NEW: LTT24 - measurement system including measuring amplifier - One for all! - Distinguished with the MessTec&Sensor Masters Award 2013

LTT24

As with a good orchestra, the innovative concept of the LTT24 is based on optimising every single component, such as preamplifier and A/D converter, but also mains adapter, sensor supply, sensor cable and more, as well as their harmonic interaction within the overall system.

The LTT24 is so well thought through that there is no room for measuring errors!

Slow, fast and very fast channels can be combined in one modular unit.

With all error sources consistently minimized, the full precision of the LTT24 preamplifier can be exploited. Distortion and noise together are close to -100 dB and allow an ENOB (effective number of bits) of true 16 bit across a wide range of frequencies and amplitudes.

The LTT24 mains adapters work highly synchronously at half the ADC clock speed and thus remain invisible over the total bandwidth from DC to 2 MHz. The common mode rejection of the differential amplifiers - crucial for the suppression of external, typically high-frequency stray pick-up from the sensor cables - allows adjustment from DC to more than 1 MHz bandwidth at the touch of a button, and this better than -100 dB. All measurement channels (such as voltage, current, resistance, ICP, LVDT, strain gauge, charge) are galvanic isolated and provide stable sensor supply up to the MHz range – in fact, more precisely than the measurement resolution of
-117 dB.

Modular cabinets:

4, 8, 12, 16 or 32 slots
Extendable at any time

Modular options:

1 - 64 analogue outputs
1 - 256 digital IOs
1 - 4 internal SSD hard disks and battery for "stand-alone" or "time-delayed view" -
Don't ever miss an important moment again! Just rewind!

Modular channels:

Ultra-performance: 24 bit with 4 MSample/s per channel
Unmatched accuracy on the market: amazing 16 ENOB!
Unmatched ﬂat bandwidth on the market: amazing DC - 1.7 MHz
Best common-mode rejection ratio (CMRR) on the market
Best galvanic isolation: No-Noise DC/DC supply with 2 MHz clock
Adequate sensor supply: Voltage, current, carrier frequency
Inputs for: Voltage, charge, ICP, strain gauge, current, LVDT, resistance …

Slow channels: 24 bit with 2 kSample/s
4 channels per slot
For temperature, pressure, etc.

Digital channels
CAN Bus, SPI, Clock, Pulse
for measurement on cars
for measurement of rotational fluctuations in the nanosecond range.

Connectivity:

Synchronisation interface for external hardware
SyncE and IEEE 1588: Nanosecond synchronisation via Gigabit Ethernet
USB3.0 and Dual Gigabit Ethernet connection to PC.

LTT24 front panel with inputs for:

Strain gauge, ICP, charge, voltage, current
CAN bus
Thermo

LTT24 rear panel with:

Analogue outputs
Dual Gigabit Ethernet
Digital IOs
Synchronisation
USB3.0

Software:

LTTpro: Control and Visualisation Software
LTT2API: Library for integration in customer applications
LTTxxx: Compatible with LabView, DasyLab, Matlab, etc.

Brochure and specifications for download:

LTT24Engl3-2015-W, 598 KB

Manual and Pin layout DIN connector:

LTT24-Manual, 5015 KB

LTT24 Inputs for measuring sensors

Strain Gauges

The LTT24 provides optional inputs for strain gauges.

1/4, 1/2 and full bridges are supported.

Adjustable sensor supply: 1, 2, 5, 10V (maximum 1W per channel.)

Internal extra resistors: 120 and 350 Ohm.

Sense line

ICP Sensors

The LTT24 provides optional inputs for ICP sensors.

Accelerometers, pressure sensors, measurement microphones and many others can be connected.

Constant current can be selected between 0.5mA and 10mA in 0.5mA steps.

Charge Sensors

The LTT24 provides optional inputs for charge sensors.

Pressure sensors, hydrophones and many others can be connected.

Measuring range: +/- 5nC

Sensitivity: 1mV/pC

High-pass 150mHz, 1,5Hz and 15Hz

Automatic and manual discharging of the capacity.

Voltage and Current Inputs

The LTT24 offers voltage and current inputs.

Measuring ranges +/-250mV, 5V, 50V and optionally 200V.
Plus +/-50mA

24bit A/D converter.

Sample frequency: up to 4MSample/s per channel

Bandwidth: DC - 1,7MHz

Very low noise: -100dB to FSR at 1MHz

16bit ENOB (Effective number of bits)

More information: r_435

Pulse Input

The LTT24 provides optional inputs for pulse signals.

Each Pulse Module has up to 3 inputs (A, B, Z) that are sampled with 1.024GHz.

Input range -30…+80V with digitally adjustable trigger threshold.

A: Pulse input (sinusoidal or TTL)

B: Direction of rotation (for example cosine)

Z: 0° identification. One pulse per revolution.

Internal calculation of φ angle and its time derivatives φ' und φ''.

Plus ∆φ and ∆φ' and ∆φ'' for a virtual uniformly rotating system.

Analogue output of one mathematical result per Pulse Module.

Output amplitude circa ±5V Possible applications:

Tip Timing on turbines

Rotational vibration analysis

The analogue outputs can for example be used to connect a FFT Analyser and to analyse the ∆φ signal.

LTT24 Stand-Alone Recorder

The LTT24 measurement system with integrated SSD

As an option, the LTT24 measurement system is also available with a built-in 64GB SSD. (Other SSD sizes on request.)

The system allows uninterrupted recording of measured data with more than 256MByte/s onto the internal SSD.

The 24bit A/D converters generate a data flow of 4Byte per sample with up to 4MSample/s per channel.

This results in a maximum overall sampling rate of 64MSample/s per LTT24 unit.

Using the maximum sampling rate of 4MSample/s (bandwidth DC-1.6MHz), you can record 16 channels for 4 minutes onto the internal 64GByte SSD.

Recording length on 64GByte SSD
Channels	Sampling rate [MHz]	Bandwidth [DC - kHz]	Recording length [min]
16	4	1600	4
16	2	800	8
16	1	400	17
16	0,5	200	34
16	0,25	100	68
16	0,125	50	136

16 channels with 1MSample/s per channel (or less) can be stored directly and without interruptions on a computer hard disk using a USB 3.0 interface.

This requires a computer and an internal hard disk (SSD) with sufficient performance!