TestingSpecs2023_pcb_1.xlsx
XLSX spreadsheet 34 KB Posted
- Attached to
- Seismic Equipment IDIQ Federal contract opportunity
- Solicitation number
- 140G0324R0002
About this file
This document contains technical specifications for a strong-motion accelerometer for use in seismic equipment. The specifications include requirements for the number and orientation of sensor components, clip level and noise floor parameters, output signal format and accuracy, sensitivity and non-linearity tolerances, documentation, and cross-axis coupling. Temperature effects on sensor output and calibration are also specified.
The related federal contract opportunity is a indefinite-delivery/indefinite-quantity seismic equipment contract to be awarded by the Department of the Interior's U.S. Geological Survey Office of Acquisitions and Grants. The solicitation number is 140G0324R0002 and the opportunity type is listed as a pre-solicitation notice. The contract will support the agency's seismic monitoring needs.
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Strong-Motion
| Table 1 | ||||||
| Item | Performance Metric | Accelerometer | Vendor's Certification of Compliance | |||
| (Mark One ×) | Vendor's Comments | |||||
| Yes | Partially | No | ||||
| 1 | Number of components (mutually orthogonal system only) | Three orthogonal components: with output of one vertical and two horizontal. Case must indicate direction of sensitive axis | ||||
| 2 | Clip-level (peak) | Required: ±4 g with option for operation in ±2 g |
Desired: option for operation in ±1 g and ±1/4 g modes 3 Incoherent Sensor Noise Required -100 dB relative to (1 m/s^2)/Hz^.5 from 0.1 Hz to 80 Hz Desired: as low of noise as possible
| 4 | Corner frequencies | |
| (at –3 dB points) | Required: 0Hz (DC) with an upper corner ≥50 Hz |
Desired: ≥100 Hz upper corner
| 5 | Output seismic signal | ||
| (shall be differential) | ±20 V output at peak acceleration | ||
| 6 | Amplitude Accuracy | Upon correction of both the sensitivity and response of the sensor the output signals should reflect true ground motion to within 1% when between 0.01g and the clip level | |
| 7 | Sensitivity accuracy at 20 °C | Required: ≤1% for 10 Hz to 0 Hz (DC) |
Desired: ≤1% for 100Hz to 0 Hz (DC)
| 8 | Non-linear distortion | Sum of the ratio of power of fundamental mode to the sum of the power of the observed harmonics ≤-50 dB in acceleration | |
| 9 | Documentation | Documention for operating the instrument as well as response and sensitivity information will be provided | |
| 10 | Cross-axis coupling | ||
| (translation-translation) | Required: ≤–40 dB |
Desired: ≤–60 dB; for total cross-axis, including that due to misalignment of active axis relative to case reference
| 11 | True axis orientation | |
| relative to case axis | Less than one degree of module misorientation | |
| 12 | Temperature-induced | |
| output offsets and sensitivity errors | Offset <2% full-scale over –20 to +40 °C. |
Offset <1% full-scale over 0 to +40 °C
| 13 | Temperature range over which sensor remains operational (even if not within Performance Metrics) | –30 to +60 °C | |
| 14 | RFI susceptibility | Sensor must not record or detect Radio Frequency Interference (RFI) signals at 20 m from a 1-kW transmitter. | |
| 15 | Clip recovery to within | ||
| offset limits in Item 12 | <1 s | ||
| 16 | Expected lifetimes | Sensor should be fully operational in a field deployment for a minimum of 10 Years | |
| 17 | Calibration input | Required: Some means should be provided of verifying basic operability of the sensors and of reporting this operability to the DAU either as a digital signal or data. |
Desired: a calibration-enable input that be active high (+5V), and which shall remain "off" if not connected, and calibrator input sensitivity will be sufficient to drive the accelerometer output to at least 50% of full scale at 0.1 Hz with a current of 0.4 mA at 5 V or less. The calibration coil response must have no frequency dependence.
Broadband
| Table 2 | ||||||
| Item | Performance Metric | Broadband | Vendor's Certification of Compliance | |||
| (Mark One please distinguish between A+, A, and B) | Vendor's Demonstration of Compliance and Comments | |||||
| Yes | Partially | No | ||||
| 1 | Sensitive Axes | Three orthogonal components: with output of one vertical and two horizontal. Case must indicate direction of sensitive axis. Galperin sensors are acceptable as long as they are capable of outputting two horizontal and one vertical component of motion | ||||
| 2 | Clip-level (peak) | ≥±0.01 m/s midband for a sensitivity of 1500 Vs/m; |
similar pairings acceptable 3 Maximum Incoherent Noise A+: ≥3 dB below NLNM over 0.01 – 10 Hz;
A: below NLNM over 0.01 – 10 Hz;
A-: ≤3 dB above NLNM over 0.01 – 10 Hz B: ≤3 dB above NLNM over 0.05 – 10 Hz
| 4 | Corner frequencies | ||
| (at –3 dB points) | Lower corner ≤0.0083 Hz; upper corner ≥20 Hz | ||
| 5 | Amplitude Accuracy | Required: Upon correction of both the nominal sensitivity and response of the sensor the output signals should reflect true ground motion to within ≤1% over 0.005 – 1 Hz; ≤1.5% over 1 – 10 Hz; ≤1 5% >10 Hz @ 20°C |
Desired: 1% across the full-range with sensor-specific responses acceptable
| 6 | Phase Accuracy | Nominal response should reflect true phase to ≤ 1° over 0.01–10 Hz , ≤ 3° over 10 - 20 Hz, ≤ 10° > 20 Hz |
| 7 | Output seismic signal (shall be differential) | ±20 V output at peak velocity |
| 8 | Sensitivity at output | 750 – 20,000 V/m/s at 1 Hz |
| 9 | Non-linear distortion | Sum of the ratio of power of fundamental mode to the sum of the power of the observed harmonics ≤-50 dB in velocity |
| 10 | Documentation | Documention for operating the instrument as well as response and sensitivity information will be provided |
| 11 | Cross-axis coupling (translation-translation) | Required: ≤–40 dB |
Desired: ≤–60 dB; for total cross-axis, including that due to misalignment of active axis relative to case reference
| 12 | True axis orientation | ||
| relative to case axis | Less than one degree of module misorientation | ||
| 13 | Temperature-induced output offsets and sensitivity errors | Sensitivity of less than 50 mm/s^2/C RMS over 24-hour period temperature changes | |
| 14 | Temperature range over which sensor remains operational (even if not within Performance Metrics) | –30 to +60 °C | |
| 15 | RFI susceptibility | Sensor must not record or detect Radio Frequency Interference (RFI) signals at 20 m from a 1-kW transmitter. | |
| 16 | Clip recovery | < 10 minutes | |
| 17 | Expected lifetimes | Sensor should be fully operational in a field deployment for a minimum of 10 Years | |
| 18 | Control lines and mass position signals | Sensor shall have analog (communicatable from most modern seismic digitizers) control lines. These shall be configured as active-high. The sensors mass positions should have an analog output along with a known sensitivity so that it is possible to convert to percentage of full-scale | |
| 19 | Calibration input | Some means should be provided of verifying basic operability of the sensors and of reporting this operability to the DAU either as a digital signal or data. This shall also include a calibration-enable input that is active high (+5V), and which shall remain "off" if not connected. Calibrator input sensitivity will be sufficient to drive the seismometer output to at least 25% of full scale at 0.1 Hz with a current of 0.4 mA at 5 V or less. The calibration coil response must have no frequency dependence. |
DAU
| Table 3 | |||||
| Item | Performance Metric | Class 1 | Class 2 | Vendor's Certification of Compliance | |
| (Mark One please distinguish between Class 1, 2, or 3) | Vendor's Demonstration of Compliance |
and Comments
| Yes | Partially | No | |||||
| 1 | Number of high-resolution channels | Six or more | Six or more | ||||
| 2 | Mass position channels | One per high-resolution channel, ≥0.1 samples per second and ≥10 bits resolution | |||||
| 3 | Auxiliary input channels | DAU to support at least 4 differential or 8 signal-ended user-configurable auxiliary input channels, each of ≥1 samples per second and ≥10 bits | |||||
| 4 | Sampling rates | 0.1, 1, 20, 40, 100, and 200 sps; 3 or more simultaneous streams | 1, 20, 40, 100, and 200 sps; 2 or more simultaneous streams | ||||
| 5 | Sampling simultaneity | Samples taken simultaneously on all channels within ±1 ms of the mean sampling time | |||||
| 6 | Resolution (Effective Bits) | ≥21 bits (128.1 dB), | |||||
| 0.00278 – 50 Hz, and: | ≥20 bits (122.1 dB) |
over 0.0083 – 50 Hz, and:
| 23 bits (140.2 dB), 0.01 – 15 Hz | 21 bits (128.1 dB), 0.01 – 15 Hz | |||
| 22 bits (133.9 dB), 15 – 30 Hz | 20 bits (122.1 dB), 15 – 30 Hz | |||
| 7 | User-selectable | |||
| preamplifier gains | 1× and at least one additional pre-amp gain beween x10 and x40 | |||
| 8 | Filters | DAU shall provide anti-aliasing filtering (such as brick-wall digital anti-aliasing) to remove energy (more than -90dB reduction) at and above the Nyquist frequency. Pass-band ripple (DC to 80% Nyquist frequency) shall be less than 3%. | ||
| 9 | Non-linear distortion | ≤–70 dB in precision-sinusoid excitation at ADC-system input at unity gain | ||
| 10 | Gain and offset stability and accuracy over temperature | The nominal gain must be accurate using a DC input at 10 to 30 °C to ≤0.25%. Additionally the nominal gain must be stable with temperature changes to ≤0.50% over 0 to 40 °C and ≤1% over full operating temperature range. DC Offset is less than 0.5% full-scale from 0 to 40 °C. | ||
| 11 | Ground currents, supply- and | |||
| reference-voltage stability | No part of the analog system, including amplifiers and ADC, shall suffer noise, offset, sensitivity disturbance, or channel crosstalk above the system's 50-Ω terminated noise floor at any time due to GPS, or telemetry power up, or any other system activity. | |||
| 12 | Worst timing error | ≤1 ms | ||
| 13 | Disciplined internal time reference accuracy | 0.1 ppm/°C and 0.1 ppm/day | ||
| 14 | Short term storage | Required: Complete and continuous; storage of ≥12 hours at 200Hz sample rate with data compression enabled for real-time telemetry; |
Desired: Complete and continuous; storage of ≥24 days at 200Hz sample rate with data compression enabled for real-time telemetry, option to not overwrite when out of communication with server 15 DAU recording Required: Complete and continuous recording into a non-volatile storage shall be provided and should be user-accessible both remotely and at the instrument. No portion of this storage should ever be erased or overwritten except by more recent data added to the storage. Users must be able to extract arbitrary data segments from this storage. This storage must be capable of storing 200Hz sample rate compression enabled data on all channels for at least 6 months.
Desired: This storage must be capable of storing 200Hz sample rate compression enabled data on all channels for at least 12 months.
16 Triggered-event memory for high-rate store-and-forward Required: ≥60-s pre- and ≥90-s post-event; save largest; triggered-event storage buffer ≥2 GBytes; no event deleted until successfully recovered by users or being overwritten by a larger event Desired: ≥120-s pre- and ≥180-s post-event; save largest; triggered-event storage buffer ≥4 GBytes; no event deleted until successfully recovered by users 17 Trigger Algorithms for High-Rate Store-and-Forward Required: All parameters user selectable. Methods to include: STA/LTA or equivalent with thresholds from ≤0.0008 to ≥1.0 g or comparable in small steps, over full system bandwidth, and timed triggers.
Desired: User-configurable trigger bands.
| 18 | Data formats and | ||
| file-naming conventions | Waveform format: miniSEED including blockette 1001 with timing quality; all other commands and messages should be in a common open format (e.g. XML). Files and messages with remote software should include DAU identification information (e.g. serial number) and should be easily understood and sorted | ||
| 19 | Data compression | Data to be compressed for storage and/or transmission by any lossless compression algorithm which is compatible with modern non-gain ranged miniSEED compression format | |
| 20 | Telemetry packet |
size and latency (including overhead) Required: ≤512 bytes. In no case shall latency exceed 30 s nor packets exceed 1200 samples per channel.
Desired: Packet size user adjustable for latency <1 s.
| 21 | Telemetry | In all cases, both continuous and event-triggered data shall be available for local storage and via telemetry simultaneously. Users must be able to select sample rates independently for each of these data streams. IP is Required; TCP/IP is desired. If UDP is used, the target address must be sent small packets at intervals of <5 s in order to maintain path information in the active memory of routers. Common open formats of communication will be used (e.g. seedlink) or vendor open-source provided formats. All interruptions in the telemetry connection and all other events, within the limits of available DAU storage memory, shall not cause any break in the time series as recorded in the DAU buffer nor as ultimately received by software communication. That is, the DAU telemetry shall support automatic backfilling and shall do so without increasing real-time latency. The DAU must provide a method for reporting internet-facing IP changes to our servers, the ideal format for this is the Q330 POC. |
| 22 | Firmware upgrades/updates | The DAU and remote software interact to accomplish safe downloads to the DAU and recoverable implementations of new versions of DAU firmware. That is, if the upgrade fails to work properly, the DAU should automatically revert to the last viable firmware version. |
| 23 | External reset | Capable of a hard system restart externally and remotely |
| 24 | Expected lifetime | DAU should be fully operational in a field deployment for a minimum of 10 Years |
| 25 | DAU sensor input | ±20 V on all high-resolution data inputs |
| 26 | Temperature Range | Meeting Performance Specifications: –20 to +40 °C; Operational Range: –40 to +60 °C |
| 27 | Documentation | Vendors shall provide complete documentation for operating the DAU as well as communicating with it both in the field and remotely |
| 28 | Control signals | Required: Lock/unlock, mass center and calibration control lines. Calibration signals of sine, step and random binary calibration at user selectable signal levels and frequencies. The calibration input signals should be recorded seperately and time-stamped for comparision with the sensor output. |
Desired: white noise calibration with user selectable frequency content.
| 29 | State-of-health | |
| (SOH) messaging | Required: SOH messages shall be generated and forwarded to the data acquisition server automatically at regular intervals (including under user control at least the intervals of one hour or less to at least one day). These SOH messages shall contain at a minimum some indication of system operability, the current battery voltage as seen by the DAU, and reporting timing accuracy. |
Desired: Additional information indicating amount of storage left on the system as well as indications of potential non-standard operation. In addition system voltage, internal clock errors, as well as DAU internal temperature should be recorded. SNMP reporting of SOH information in addition to miniSEED is highly desired.
30 Log Files Configuration messages should be transmitted upon boot, reboot, all configuration changes, and at least once per week. It may be but need not be separate from the SOH messaging system. It should include the serial number(s) of this DAU and preferably of the sensor(s). Use best practises to eliminate end user confusion or overly complicated schemes
Power and Package
| Table 4 | ||||||
| Item | Performance Metric | Instrument Package | Vendor's Certification of Compliance | |||
| (Mark One ×) | Vendor's Demonstration of Compliance and Comments | |||||
| Yes | Partially | No | ||||
| 1 | Power type and | |||||
| average consumption | The DAU shall draw an average total of ≤0.5 W per active input channel inclusive of telemetry and GPS. The sensors shall draw an average of not more than 1 W quiescent and 1.5 W peak per active component. | |||||
| 2 | DAU to sensor | DAU shall supply 10.8 to 16.0 VDC single sided power to sensor, with not more |
than 1 mV ripple. Sensor shall be able to operate at full capability using this power.
| 3 | Connectors | All external connectors must be IP67 compliant. Additionally, Post-hole, direct burial, and borehole connectors must meet IP68 requirements and be able to withstand submersion up to 10m depth. | |
| 4 | Sensor Connector PinOut for DAU | The sensor connector on the DAU must use the connector and pin-out of the "Standard Seismic Connector" (see below for details). If the DAU hardware itself doesn't contain this connector, a short (less than 70cm) adapter cable must be provided with each DAU purchase for each set of 3 channels. For each DAU to Sensor cable that the vendor offers, they must also offer that cable with the "Standard Seismic Connector" (a short, less than 70cm, adapter cable can be offered to meet this requirement). | |
| 5 | Environmental | ||
| considerations | All DAU and sensors should be able to handle common field conditions (e.g. IP67 compliant). Additionally, Post-hole, direct burial, and borehole sensors must meet IP68 requirements and be able to withstand submersion up to 10 m depth. | ||
| 6 | Leveling and anchoring | All sensors shall be supplied with mechanism for leveling. All strong-motion components shall be supplied with tie-down devices and internal bracing to prevent movement of the sensor, DAU, and other external units as well as shifting of internal parts up to ±3.5 g. Unless Post-hole, direct burial, or borehole, a bubble level must be included on the sensor's case. If a bubble level is provided, it must be accurate and functional. | |
| 7 | Mass | DAU (less external power supply): ≤10 kg; External three-axis sensor vault or direct bury: ≤15 kg; External borehole sensor: ≤35 kg | |
| 8 | Sensor orientations | Z,Y,X at sensor connector and in DAU logical channel |
ordering (in use, Z,Y,X are generally oriented for positive ground motions and sensor outputs up, North, and East) 9 Sensor Installation The units must be capable of being leveled and oriented with standard field tools (e.g. bubble level and orienting rod). If additional tools are required they will be provided with the instrument as well as documentation on using the orientation and leveling equipment. Borehole and posthole sensors must be equipped with a lifting bail for raising and lowering the sensor and will have a minimum working load limit of 5,000 kg (50,000 kg minimum breaking load)
| Standard Sensor Connector on the DAU |
| 16-26S Circular Connector (PT02E-16-26S or KPSE02E16-26S or equivalent) |
| Pin | Description |
| A | CH1+ |
| B | CH1- |
| C | CH2+ |
| D | CH2- |
| E | CH3+ |
| F | CH3- |
| G | PGP chassis/shield gnd |
| H | 12V |
| J | PwrRtn |
| K | Mpos1 |
| L | Mpos2 |
| M | Mpos3 |
| N | Analog gnd |
| P | CalSignal |
| R | Lock ctrl |
| S | Unlock ctrl |
| T | Center ctrl |
| U | CalEN |
| V | Digital gnd |
| W | misc control1 and/or RX for digital sensor comms |
| X | misc control2 and/or TX for digital sensor comms |
| Y | misc1 (not specified) |
| Z | misc2 (not specified) |
| a | misc3 (not specified) |
| b | misc4 (not specified) |
| c | misc5 (not specified) |
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