JanasCard
Data acquisition modules
AD24USB/AD24ETH
is a data acquisition module with high resolution up to 26 bits (sampling rate 3 samples/s) and galvanic isolation from PC. AD24USB uses USB, AD24ETH uses Ethernet 100/10 Mbit for simple connection over LAN. The module offers an additional unique feature: AC modulation of input or excitation voltage or current. This feature eliminates parasitic thermoelectric voltages and input offset and dramatically reduces input noise. Input noise with activated AC modulation is only 15 nVpp for measurement speed of 1 sample/sec. It is comparable with good nanovoltmeters but with fast input multiplexing due to digital implementation of modulation and fast digital filter at fraction of the cost of nanovoltmeter. AC modulation of the excitation voltage or current is another unique feature which eliminates also parasitic thermoelectric voltages in input wires from sensors. AC modulation gives temperature resolution 0.0001 deg.C with Pt100. Details about AC modulation can be found here. Connection options for various sensors like thermocouples, strain gauges, Pt100 are described here.
Version of this module called USB2AD respectively ETH2AD for measurements with Hall sensors was made for AREPOC and this version is also still available.
Specification:
AD section - an integrating AD converter with resolution from 22 to 26 bits with galvanic isolation from USB, sampling rate from 80 to 3 samples/s, 8 differential or 16 SE inputs, input range 10 V/ +-5 V, programmable gain 1 to 128 (1 to 512 for differential version), noise without AC modulation 210nVpp, noise with AC modulation 15 nVpp for 1 sample/sec, expanders for thermocouples, strain gauges, Pt100, Pt1000 or RTDs.
DA section - optional - resolution 16 bits, range 0-5 V(10 V) or current 0-20 mA (100 mA),.
Digital I/O - 2 dig. inputs/4 dig. outputs.
Software - driver for Win XP-Win10 and DLL library for development in Delphi, Visual Basic, C++, Matlab, LabView etc. AD24USB/AD24ETH comes also with software AD24control - simple but powerful program which offers data capture, graphs, printing and export to other programs like EXCEL, Matlab etc.
Price from 370 Euro
Ultra pure oscillator
Oscillator with typicall THD bellow 150 dB at 1 kHz, 10 Vpp with adjustable output amplitude. Different frequency is available upon request. Various versions are available - from an unpopulated set of PCBs for DYI to a boxed version. Detailed description can be found here.
Price from 23 Euro for an unpopulated set of PCBs