Specifications

Data acquisition module

Configuration interface: Windows® graphical programming

Analog inputs: Up to 18 single-ended or up to 9 (each differential input occupies two single-ended inputs). User-settable range of ±20 mV, ±40 mV, ±80 mV, ±160 mV, ±320 mV, ±640 mV, ±1.25 V, ±2.5 V, and ±5 V

With built-in excitation voltage: 2 (5 V, 25 mA excitation)

With selectable current or voltage: 2 (User-settable range of ±2.5 µA, ±25 µA, and ±250 µA)

Resolution: 24 bit

SDI-12 inputs

Digital inputs/outputs: 4

Output: 5 V logic

Input: 5 V or 3.3 V logic

Switched voltage outputs: 3

Output voltage: 9 to 30 VDC

Output current: Up to 1 A, with current sensing

12V excitation voltage output: 1

Up to 200 mA @ 25 °C

Sampling rate: 1 measurement per second

Time Synchronization: Within 3 seconds of GPS clock in SmartFlux

Communications protocol: RS-485 input and output into SmartFlux for storage and processing with EddyPro

Power requirements: +9 to 30 VDC

Power consumption: 0.85 W (@9 V) to 1.3 W (@30 V)

Dimensions: 17 cm × 10.9 cm × 7 cm (W × H × D)

Weight: 0.52 kg

Data retention module

Communication protocol: RS-485 input and output into SmartFlux for storage and processing with EddyPro

Power outputs (DC-DC converter): 4 (12 VDC maximum)

Maximum per output: 2 Amps (24 watts) up to 5 amps total for all outputs

Total maximum power out: 5 amps (60 watts)

Protection: Self-resetting fuses; Near instantaneous reset with brief overcurrent, 1 minute delay after major short.

Power requirements: +9 to 32 VDC

Back-up Battery Charger: Recharges the backup battery when main power is on and switches to the backup if main power fails.

Data storage: 32 MB; Backup biomet data collection capacity generally depends on backup battery capacity. With a large enough battery, the Data Retention Module can store over one month of backup data.

Dimensions: 17 cm × 10.9 cm × 7 cm (W × H × D; not including battery)

Weight: 0.52 kg (not including battery)

Backup battery

Type: Lead Acid

Output: 12 VDC; 7.2 Amp Hour

Fuse: 10 Amp, quick acting

Weight: 2.5 kg

EddyFlux system enclosure

Dimensions: 39 cm × 45 cm × 21 cm (W × H × D)

Weight: 7.71 kg

Compatible wire gauges: 26 AWG to 14 AWG

Biomet package power requirements

The power requirements for each sensor package depend upon the components in use.

Basic Biomet Package: Normally 1.6 W; Maximum 3.9 W

Standard Biomet Package: Normally 1.6 W; Maximum 3.9 W

Advanced Biomet Package: Normally 2.3 W; Maximum 20 W

Biomet Package 1: Normally 1.6 W; Maximum 3.9 W

Biomet Package 2: Normally 1.6 W; Maximum 3.9 W; 20 W with CNF4

Biomet Package 3: Normally 2.3 W; Maximum 4.8W

Biomet Package 4: Normally 2.3 W; Maximum 4.8 W; 20 W with CNF4

Blueprint Utility software

OS System requirements: Windows 7 or newer, 64-bit architecture; macOS, 64-bit architecture.

RAM: 4 GB minimum; 8 GB recommended

Processor: Intel Core 2 - 2.0 GHz minimum; Intel i3 - 2.6 GHz or better recommended

Input specifications

Detailed specifications for DRM inputs are given below.

Single-ended voltage inputs

Table E‑1 gives the general specifications for the single-ended voltage inputs. The RMS noise statistics were obtained from a single DAqM at 25 °C and were based on n = 100 points sampled at 1 Hz with the input shorted to GND. The absolute accuracy specifications apply over the entire -40 to 50 °C operating range. The accuracy column specifies the error of the measurement as a percentage of the measurement reading plus an offset. The absolute gain accuracy was calculated by summing the absolute values of the maximum measured box-fitted temperature coefficient of five DAqMs over a -40 to 50 °C (-7.2 ppm/°C × 90 °C = 648 ppm) operating range plus the 50 ppm gain accuracy of the Agilent 34465A DMM used for voltage calibration plus a 100 ppm gain error tolerance from the gain calibration verification, |-648| + |100| + |50| ≈ 800 ppm (0.08%). Offsets were measured on all 18 single-ended voltage channels shorted with low thermal EMF silver clad solid copper wire to their matching GND of four DAqMs over a -40 to 50 °C operating range. The offsets were computed by summing the absolute value of the mean offset over temperature plus 6 standard deviations rounded up to the nearest µV.

Table E‑1. Single-ended voltage input specifications.
Range (5% Overhead) Gain Setting Resolution RMS Noise (−40 to 50 °C) Accuracy
±5,000 mV 1/2 0.64 µV 1.6 µV ±(0.08 % + 6 µV)
±2,500 mV 1 0.32 µV 0.79 µV ±(0.08 % + 4 µV)
±1,250 mV 2 0.16 µV 0.42 µV ±(0.08 % + 3 µV)
±640 mV 4 0.08 µV 0.23 µV ±(0.08 % + 2 µV)
±320 mV 8 0.04 µV 0.13 µV ±(0.08 % + 2 µV)
±160 mV 16 0.02 µV 0.09 µV ±(0.08 % + 2 µV)
±80 mV 32 0.01 µV 0.07 µV ±(0.08 % + 2 µV)
±40 mV 64 0.005 µV 0.08 µV ±(0.08 % + 2 µV)
±20 mV 128 0.0025 µV 0.07 µV ±(0.08 % + 2 µV)

Differential voltage inputs

Table E‑2 gives the general specifications for the differential voltage inputs. The offset, gain, and noise specifications and testing parameters are equivalent to those used for the single-ended voltage inputs.

Table E‑2. Differential voltage input specifications.
Range (5 % Overhead) Gain Setting Resolution RMS Noise     Accuracy (−40 to 50 °C)
±5,000 mV 1/2 0.64 µV 2.1 µV ±(0.08 % + 6 µV)
±2,500 mV 1 0.32 µV 1.0 µV ±(0.08 % + 4 µV)
±1,250 mV 2 0.16 µV 0.52 µV ±(0.08 % + 3 µV)
±640 mV 4 0.08 µV 0.24 µV ±(0.08 % + 2 µV)
±320 mV 8 0.04 µV 0.14 µV ±(0.08 % + 2 µV)
±160 mV 16 0.02 µV 0.12 µV ±(0.08 % + 2 µV)
±80 mV 32 0.01 µV 0.09 µV ±(0.08 % + 2 µV)
±40 mV 64 0.005 µV 0.08 µV ±(0.08 % + 2 µV)
±20 mV 128 0.0025 µV 0.08 µV ±(0.08 % + 2 µV)

Differential voltage inputs with 100 kΩ pull-down enabled

Table E‑3 gives the general specifications for the differential voltage inputs with the 100 kΩ pull-downs enabled. The offset, gain, and noise specifications and testing parameters are equivalent to those used for the differential voltage inputs with the exception that the differential voltage input pairs were shorted together but not shorted to GND.

Table E‑3. Differential voltage input with 100 kΩ pull-down enabled.
Range (5 % Overhead) Gain Setting Resolution RMS Noise Accuracy (−40 to 50 °C)
±5,000 mV 1/2 0.64 µV 2.0 µV ±(0.08 % + 7 µV)
±2,500 mV 1 0.32 µV 0.95 µV ±(0.08 % + 4 µV)
±1,250 mV 2 0.16 µV 0.58 µV ±(0.08 % + 3 µV)
±640 mV 4 0.08 µV 0.25 µV ±(0.08 % + 3 µV)
±320 mV 8 0.04 µV 0.15 µV ±(0.08 % + 3 µV)
±160 mV 16 0.02 µV 0.09 µV ±(0.08 % + 3 µV)
±80 mV 32 0.01 µV 0.08 µV ±(0.08 % + 3 µV)
±40 mV 64 0.005 µV 0.08 µV ±(0.08 % + 3 µV)
±20 mV 128 0.0025 µV 0.08 µV ±(0.08 % + 3 µV)

Thermistor input current

Table E‑4 gives the general specifications for the thermistor inputs. The RMS noise statistics were obtained from a single DAqM at 25 °C and were based on n = 100 points sampled at 1 Hz with the input floating and excited with 5 V. The absolute gain accuracy was calculated by summing the absolute values of the temperature coefficient over a -40 to 50 °C (25.9 ppm °C 90 °C = 2,331 ppm) operating range plus the 270 ppm gain accuracy of the Keithley 2400 SMU used for current calibration plus a 100 ppm gain error tolerance from the gain calibration verification, 2331 + 270 + 100 2,701 ppm 0.27 % . The offset current was computed as the RMS sum of the leakage current sources in the thermistor excitation circuit.

Table E‑4. Thermistor input current specifications.
Range (5 % Overhead) Gain Setting Resolution RMS Noise Accuracy (−40 to 50 °C)
0 – 180 µA 1/2 22.4 pA 100 pA ±(0.27 % + 6.2 nA)

Thermistor resistance measurement

Table E‑5 gives the general specifications for the thermistor resistance measurement. The RMS noise statistics were obtained from a single DAqM at 25 °C and were based on n = 300 points sampled at 1 Hz using finder-1.0.79 to graph and compute the standard deviation based on the test resistance that was measured. The thermistor resistance measurement accuracy specifications were derived from the worst-case thermistor input current specification in Table E‑4 and the single-ended voltage input specifications in Table E‑1.

Table E‑5. Thermistor resistance measurement specifications.
Measured Resistance RMS Noise Accuracy (−40 to 50 °C)
1 kΩ 0.008 Ω ±0.36 %
5 kΩ 0.011 Ω ±0.36 %
10 kΩ 0.038 Ω ±0.36 %
50 kΩ 0.057 Ω ±0.36 %
100 kΩ 0.220 Ω ±0.37 %
500 kΩ 3.10 Ω ±0.42 %
1,000 kΩ 12.5 Ω ±0.48 %

Light sensor current input

Table E‑6 gives the general specifications for the TIA inputs. The RMS noise statistics were obtained from four DAqMs at 25 °C and were based on n = 300 points times eight channels sampled at 1 Hz with the inputs floating using finder-1.0.77 to graph and compute the standard deviation. Each channel was independently analyzed and the maximum standard deviation was used. The absolute gain accuracy was calculated by summing the absolute values of the temperature coefficient over a -40 to 50 °C (25.9 ppm °C 90 °C = 2,331 ppm) operating range plus the 270 ppm gain accuracy of the Keithley 2400 SMU used for current calibration plus a 100 ppm gain error tolerance from the gain calibration verification, 2331 + 270 + 100 2,701 ppm 0.27 % . The offset current was computed as the RMS sum of the leakage current sources in the light sensor TIA circuit.

Table E‑6. Light sensor current input specifications.
Range (5 % Overhead) Gain Setting Resolution RMS Noise Accuracy (−40 to 50 °C)
±250 µA 10 kΩ 31.3 pA 220 pA ±(0.27 % + 3 nA)
±25 µA 100 kΩ 3.13 pA 22 pA ±(0.27 % + 3 nA)
±2.5 µA 1,000 kΩ 0.313 pA 2.5 pA ±(0.27 % + 3 nA)

Switched voltage output current-sense

Table E‑7 gives the general specifications for the switched voltage output current-sense channels. The RMS noise statistics were obtained from three switched voltage current-sense channels from a single DAqM at 25 °C and were based on n = 100 points sampled at 1 Hz with the outputs ON and the DAqM powered by 12 V. The offset current has both temperature and common-mode voltage dependent components.

Table E‑7. Switched voltage output current-sense specifications.
Range (5 % Overhead) Gain Setting Resolution RMS Noise Accuracy (−40 to 50 °C)
0 – 1.35 A1 1/2 0.25 µA 2.8 µA ±(0.40 % + 450 µA + 20 µA/V)2

VSYS inputs

Table E‑8 gives the general specifications for the VSYS voltage sensing. The VSYS voltage-sense has a DAqM input current dependence because the input protection circuitry adds ~0.13 Ω of input resistance.

Table E‑8. VSYS input specifications
Range (5 % Overhead) Gain Setting Resolution RMS Noise Accuracy (−40 to 50 °C)
0 – 48 V34 1 6 µV 20 µV ±(1.1 % + 10 mV + 130 mV/A)5

5V excitation

Table E‑9 gives the general specifications for the 5V excitation channels. The accuracy was calculated by RMS summing the temperature coefficient over a −40 to 50 °C (25.5 ppm/°C × 90 °C = 2,294 ppm) operating range plus the 500 ppm initial accuracy of the LTC6655C-2.5 reference plus the 1,000 ppm initial gain error of the 5V excitation circuit, = 2,552 ppm (0.26 %) and ±0.26 % × 5 V = ±13 mV of error.

Table E‑9. 5V excitation specifications.
Accuracy (-40 to 50 °C)
5 V ± 13 mV