Analogue & Digital
Data Acquisition is a process of acquiring analogue signals from one or more transducers and converting the sampled signals into digital numeric values which can be manipulated by a computer. Therefore, transducers sensing physical phenomena convert parameters to raw electrical signals, while signal conditioning circuitry improves the linearity of the raw signals so that they can be accurately converted to digital values. An Analogue-to-Digital converter (ADC) formats the sampled signals into digital values to enable computer reading, software analysis and network communications. The analogue-to-digital converter is considered as the key device of a Data Acquisition System (DAS or DAQ).
A Data Logger is a data acquisition system that doesn’t rely on a computer for the initial storage of data, and can range from 1 or 2 channels to complex multi-channel instruments.
|Products||Measuring ranges||A/D converter||Protection class||Measured value memory||Operating temperature|
|ALMEMO® 2450, Base model Measuring Instrument, Compact, 1 Input (4 channels)||35||Delta-sigma, 15 bit resolution||IP54||–||-10 to +60 ℃|
|ALMEMO® 2470 Universal Datalogger with Colour screen alarms for limit value monitoring, Compact||>=65||Delta-sigma, 24bit resolution, low power, 2,2.5, or 10 mops||IP54||Up to 100,000 internal or 30 million values with external SD card||-10 to +60 ℃|
|ALMEMO® 2490, Measuring Instrument, Compact, 1 or 2 inputs (up to 8 channels)||>=65*||Delta-sigma, 16 bit resolution||IP54||100 manually logged||-10 to +60 ℃|
|ALMEMO® 2590 Universal Datalogger, Compact, 2~4 inputs (up to 20 channels)||>=65||Delta-sigma, 16 bit resolution, 2.5 or 10 mops||IP54||12,000 and options to plug SD card||-10 to +60 ℃|
|ALMEMO® 2690, Multi-function Datalogger, handheld, 5 inputs (up to 24 channels)||>=65||Delta-sigma, 24 bit resolution, Low power, Up to 100 mops||IP54||Internal EEPROM for 200,000 values and options to plug SD card||-10 to +60 ℃|
|ALMEMO® 2890, Multi-function Datalogger, handheld, 9 inputs (up to 40 channels)||>=65||Delta-sigma, 24 bit resolution||–||EEPROM for 100,000 values||-10 to +60 ℃|
|ALMEMO® 5690, Universal DAQ with Plug-in boards, from 9 to 99 inputs (up to 99 channels)||>=65||Delta-sigma, 24 bit resolution||–||Internal 512-KB EEPROM 100,000 values||-10 to +60 ℃|
|ALMEMO® 5790, Industrial housing with IP 65, Universal datalogger, up to 29 inputs||>=65||Delta-sigma, 24 bit resolution||IP65||Internal 512-KB EEPROM 100,000 values||-10 to +60 ℃|
|ALMEMO® 8590/8690, Universal Data acquisition module, 9 inputs (up to 40 channels)||>=65||Delta-sigma, 24 bit resolution||–||None, optional Internal EEPROM for 100,000 values,or SD card||-10 to +60 ℃|
|ALMEMO® 6290, Data logger with Built-in printer and ring memory, 2 inputs (up to 8 channels)||>= 65||Multi-slope inegrating, 16 bit, prints 40 characters per line, 0.6 lines/s||–||Internal 100,000 values||-10 to +60 ℃|
|ALMEMO® 2790 Measuring instrument with integrated bluetooth, Compact, 1 input||>=65*||Delta-sigma, 16 bit resolution||IP54||–||-10 to +60 ℃|
|Measuring ranges||35 or ≧ 65|
|A/D converter||Delta-sigma, 15-24bit resolution, low power, 2-100 MOPS|
* some ranges have limited span
N.B. All but some 2450 and 2490’s have 2 outputs (supporting optional bluetooth, RS232, USB, Ethernet, RS485, Networking, analogue output, trigger inputs)
There are a few types of ADC and which one to choose depends on required speed resolution.
Delta-sigma (ΔΣ) modulation is a method for encoding analog signals into digital signals. The conversion is done via close loop error feedback, where the difference between the two signals is measured and used to improve the conversion. Both ADCs and DACs can employ delta-sigma modulation. A delta-sigma ADC first encodes an analog signal using delta-sigma modulation and then applies a digital filter to form a higher-resolution digital output.
ALMEMO® data acquisition systems are modular and can be individually configured for your specific measuring task. ALMEMO data loggers feature intelligent input connectors that can connect any sensors and store all specific probe characteristics. Once a sensor is connected, the ALMEMO measuring system automatically indicates the measuring range and the measured value. No resetting of data loggers is required when sensor is changed.Highlights:
- High resolution and accuracy;
- External memory connector and micro SD card;
- Sleep mode for long-term recording;
- Rechargeable battery changing via device itself (optional);
- High speed charging model for selection;
- Wall mounting available;
- Multi-lingual menus;
For more information, CONTACT US now with your application details.
Please complete the enquiry form below for specific information and advice on Analogue & Digital.
Fields marked with a '*' are mandatory and must be filled.