■ The BAM-2260 is a four-channel USB measurement bridge DAQ unit with instrumentation amplifier and analog-to-digital converter. To enable precise measurements a sigma-delta converter is used and the analog part isolated from the digital part.
- 4(+1) analog input channels
- Ratiometric Measurements
- Windows 10/11, Linux, 32/64 bit
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- 4 bridge channels
- RTD channel for temparature compensation
- DAQ section isolated from USB
- USB Connector with high retention force
Applications
- Pressure measurement
- Strain gage transducers
- Weigh Scales
- Flow Meters
- MQTT publisher
Overview
The BAM-2260 is a four channel measurement bridge amplifier and data acquisition unit. It uses an isolated, ratiometric sigma-delta converter for precise measurements.
The software application on the computer can be developed in Python, LabView, C, C++, or any other compatible programming language supporting standard libraries.
The LabDash brower-based interface is available for interactive setup, operation and observation.
BAM Architecture
The BAM-2260 multiplexes 4 differential bridge channels (B1-4) and a RTD channel (R5) onto a sigma-delta analog-to-digital converter. In order to reduce noise, this analog part is galvanically isolated from the digital part, which consists of a controller with USB-2.0 interface.
Compatible Sensors
Due to a 3.3V bridge supply nearmost any resistive bridge sensor may be connected to the BAM-2260 without exceeding the sensor specifications. Passive bridge sensors specified for a 5V supply also work with the 3.3 V bridge supply.
Bridge Channel Connections
In ratiometric measurements, the noise effects of the bridge supply voltage P are removed by using the ratio of B/U for the measurement.
RTD Channel Connection
In resistive temperature measurements, the noise effects of the excitation current flowing through the E terminals is removed by using the ratio of the voltage drops from the Sense and Reference resistors for the measurement.
LabDash Browser-Based Interface
Measurement Uncertainty
The accuracy specifications for the device are expressed in the form: (% of reading + % of range) which match the dominate sources of error, gain and offset. The reading error term is from inaccuracies such as amplifier gains, divider ratios or internal reference voltages. The range error term is from inaccuracies such as amplifier offsets, leakage current effects and thermocouple effects. Total measurement error is the sum of the readings and range errors.
Spezifications
Analog Data
Bridge Supply Voltage: 3.3 V DC (5V compatible)
Bridge Reference Voltage: max. ± 3.3 V
Bridge Input Voltage: max. ± Reference
Isolation (USB to Analog)
Creepage distance (PCB design): ≥ 3.2 mm
Bleeder Resistor: 2.2 MΩ, 0.5 W, 1 kV
Isolation Voltage (Optocouplers): 2.5kV rms AC, 60 seconds
Connectors
USB Interface: USB 2.0 Type-B
Analog Signals: D-SUB-25S (Socket) UNC-4/40
Environmental and Physical
Size (excluding connectors): 111 mm L x 76 mm W x 29 mm H
Weight: 160 g
Operating ambient temperature: 0 … 50°C
Storage temperature: -20 … 80°C
Relative humidity: 5 … 95%, noncondensing
USB connector: Extraction force ≥ 15N, Mating force ≤ 35N
Ordering Information
BAM-2260 - Instrument, USB cable (1m), Software Download Card