STEMLab is available in two versions which both offer the same functions and features, the difference is in the technical specification of high-frequency inputs and outputs, RAM capacity and some other differences (find more info in the comparison table below). They are addressed to target different groups and / or needs. Where STEMLab 125-14 has 14bit input / output channels for highly accurate measurement results in professional environments, STEMLab 125-10 has 10bit input / output channels and is perfect for universities, students and makers.
| Basic | STEMLAB 125-10 | STEMLAB 125-14 | |
| Processor | Processor DUAL CORE ARM CORTEX A9 DUAL CORE ARM CORTEX A9 | Processor DUAL CORE ARM CORTEX A9 DUAL CORE ARM CORTEX A9 | |
| FPGA | FPGA Xilinx Zynq 7010 SOC Xilinx Zynq 7010 SOC | FPGA Xilinx Zynq 7010 SOC Xilinx Zynq 7010 SOC | |
| RAM | 256MB (2Gb) | 512MB (4Gb) | |
| System memory | Micro SD up to 32GB | Micro SD up to 32GB | |
| Console connection | USB to serial converter required | micro USB | |
| Power connector | Micro USB | Micro USB | |
| Power consumption | 1,5A | 1,5A |
| Connectivity | STEMLAB 125-10 | STEMLAB 125-14 | |
| Ethernet | 1Gbit | 1Gbit | |
| USB | USB 2.0 | USB 2.0 | |
| WIFI | requires WIFI dongle | requires WIFI dongle | |
| Synchronisation | - | Daisy chain connector (up to 500 Mbps) |
| RF inputs | STEMLAB 125-10 | STEMLAB 125-14 | |
| RF input channels | 2 | 2 | |
| Sample rate | 125 MS/s | 125 MS/s | |
| ADC resolution | 10 bit | 14 bit | |
| Input impedance | 1MOhm/10pF | 1MOhm/10pF | |
| Full scale voltage range | +-20 V | +-20 V | |
| Absolute max. Input voltage range | 30V | 30V | |
| Input ESD protection | Yes | Yes | |
| Overload protection | Protection diodes | Protection diodes |
| RF outputs | STEMLAB 125-10 | STEMLAB 125-14 | |
| RF output channels | 2 | 2 | |
| Sample rate | 125 MS/s | 125 MS/s | |
| DAC resolution | 10 bit | 14 bit | |
| Load impedance | 50 Ohm | 50 Ohm | |
| Voltage range | +-1V | +-1V | |
| Ouput slew rate | 200V/us | 200V/us | |
| Short circut protection | Yes | Yes | |
| Connector type | SMA | SMA |
| Extension connector | STEMLAB 125-10 | STEMLAB 125-14 | |
| Digital IOs | 16 | 16 | |
| Analog inputs | 4 | 4 | |
| Analog inputs voltage range | 3,5V | 3,5V | |
| Sample rate | 100kS/s | 100kS/s | |
| Resolution | 12bit | 12bit | |
| Analog outputs | 4 | 4 | |
| Analog outputs voltage range | 0-1,8V-0-1.8V | 0-1,8V-0-1.8V | |
| Communication interfaces | I2C, SPI, UART | I2C, SPI, UART | |
| Available voltages | +5V,+3,3V,-4V | +5V,+3.3V,-4V |
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