MODIFICATION
66 -- Data Acquisition System - Technical Questions and Answers
- Notice Date
- 3/31/2003
- Notice Type
- Modification
- Contracting Office
- ACA, Yuma Proving Ground, Directorate of Contracting, Buidling 2100, Ocotillo Street, Yuma, AZ 85365-9106
- ZIP Code
- 85365-9106
- Solicitation Number
- DABJ49-03-R-0014
- Response Due
- 4/10/2003
- Archive Date
- 6/9/2003
- Point of Contact
- Laura St. John, 928-328-6124
- E-Mail Address
-
Email your questions to ACA, Yuma Proving Ground
(laura.stjohn@yuma.army.mil)
- Small Business Set-Aside
- Total Small Business
- Description
- NA The following questions and answers are issued in response to technical questions received in response to solicitation DABJ49-03-R-0014. Q1) Under Specifications/Salient Characteristics reference is made to 64 or 128 channels. Under Operating Capability, reference is made to 154 channels, and under Sensors, it says 48 channels. Please clarify the number of channels required. / This line s pecifies a minimum 64 differential channels with 128 desired, 7(d) and (e) refer to 154 channels, 10 (a) identifies 80 channels for accelerometers, 10(b) identifies 32 channels for strain, 10 (c) and (d) each identify 8 channels, 13 specifies minimum syste m requirements of 48 combined strain and accelerometer channels. Could you clarify the channel requirements? A1) Minimum is 48. There is no maximum. Q1a) The requirement for 64 to 128 synchronous sampling channels which including extra required channels could equal up to 154 channels would not allow for multiplexing. This is because for the highest resolution, 16 bits at a 50K/second rate will require a pre-amplifier or a signal conditioner, and Analog to Digital conversion for each channel. In spite of the fact that we could customize and economize on space, these requirements would still require a large, potentially awkward, massive modular unit. M ight you consider some limited multiplexing? A2a) No. Per number 13 of the specification, only 48 channels are required as a minimum. Q2) The specifications in several places make mention of computational event marker channels or, remote event markers. Are these digital inputs to the data acquisition system? Please define the nature of these markers and their characteristics; A2) Computational implies that an Arithmetic (+,-,x,/) equation (entered by user) or Boolean (for digital inputs) may be applied to the numerical value that is being read by the system on a particular (or multiple is acceptable) channel. Event refers to t he condition when the system detects that a digital input has occurred or a particular (or multiple) analog channel has reached a user entered value. Q3) Thermocouple Channels; The specification makes no reference to cold junction compensation for these channels. Will the user provide this? A3) No, the system shall. Q4) Regarding strain gage measurements, is a 4-wire input satisfactory or, is something more required e.g., 6-wire or 8-wire configuration? A4) Strain gage inputs only require 2-wire inputs. Q5) For the temperatures, does this need to be a thermocouple input? If yes, does it need to support a range of thermocouple types? If a thermocouple is not required, can the vendor offer to support semiconductor based temperature sensors (for example: D allas DS1822 or DS1921 H/Z)? What is the range and resolution required? A5) Yes a type T or K (both needed) thermocouple input. The ranges for type T and K are industry standards (for K -270 to 1372 degrees Celsius and for T -270 to 400 degrees Celsius). Resolution should be one microvolt. Q6) For strain gage channels, does the unit need to have internal bridge completion for ? bridge sensors? A6) Yes Q7) Are sensors to be included with the delivered system? If so, in what quantities? / Is the contractor to provide the sensors, or just make provision for them in the DAS? A7) No, sensors are not to be included with the delivered system. Q8) Shock specifications for hard disk drives typically use a 2 ms shock duration. Can the 11 ms duration identified in item 8a be relaxed to 2 ms? A8) No, that would not meet our requirements. Q9) Vibration specifications for hard disk drives are typically given in peak g for a given frequency range. Can the (0.7) g*2/Hz specification be instead expressed in peak g? A9) No, that would not meet our requriements. Q10) Items 8c and 8d specify that the system must record all types of data without error. Would it be more reasonable to specify that error rates for thes e condit ions shall not exceed a certain percentage (e.g. 0.01%) and/or that the system shall continue to operate as in non-stressed conditions? A10) No, that would not meet our requirements. Q11) Can you clarify what optional, if environmentally compatible means in item 7f? A11) Data Storage modules are not mandatory. Q12) Are both GPS time bases and IRIG-B timebases required or is either acceptable - see item 7k? A12) Either is acceptable. Q13) Does item 7l mean that 8 remote event marker channels are required or just one channel that can record up to 8 events? A13) One channel that can record up to 8 events. Q14) Does the government have a preference for Lemo connector model(s) and is there a required pinout to match GFI sensors? A14) Lemo B series would be preferred. No required pinout. Q15) Is the bidder required to provide any mating connectors? A15) No Q16) LEMO connectors are not used for thermocouples (for obvious reasons). If the government is supplying the thermocouples, can interface information be provided, preferably manufacturer make and model? A16) Type K or T thermocouple wire will be used. Vendor supplies connection method. Q17) Are BOTH DC and AC power provided? A17) Yes Q18) Do you require access to the system controls and status screen while operating under the dust/rain conditions listed (i.e., waterproof keyboard, display, etc.) or is it sufficient that the system be able to record data in this environment? A18) Just record Q19) Do you require onboard storage of data and streaming to Ethernet and FireWire all at the same time or onboard storage and the option to stream data to either Ethernet or FireWire A19) Storage and streaming via (ethernet or firewire) Q20) Is the remote start stop capability implemented by Ethernet or by a hard wired switch or equivalent? A20) Switch or equivalent Q21) Do you require the option of file conversion to any of the three formats or one of the three? A21) To one. ASCII is preferred. Q22) What are the maximum allowable dimensions of the system?/ Environmental Specs - what size restrictions on total package? A22) Must be usable on a HMMWV. Q23) Are there any requirements for EMI? Are there requirements for weight or dimensions? How is the DAS to be physically mounted to the vehicle? A23) Not specified. Must be usable on a HMMWV. We will handle the mounting. Q24) Is Simultaneous Data Sampling necessary for the 1 Hz sampled channels, what is the maximum skew time? A24) Yes. Skew rate not specified. Q25) Operation with vehicle power? Please Clarify A25) Battery Q26) What are the maximum allowable power consumption of the system? A26) Not specified Q27) What series of LEMO connector does the system need to have? A27) B would be preferred Q28) What is the maximum isolation voltage and minimum isolation resistance necessary for the isolated channels ? A28) Not specified Q29) How are the data rates to be selected, by the operator on the DAS control front panel, or by hard coding in the software? A29) Either Q30) Please define selectable or variable Anti-Aliasing By variable do you desire various filters for each data rate, or a single filter for each of the various data rates? Does selectable mean the ability to turn the anti-aliasing completely off and have un-filtered data. A30) Single. Yes Q31) Selectable or variable Anti-Aliasing please clarify? A31) Either one Q32) How are the filters to be selected on the DAS control front panel, by hard coding in the software, or circuit board swap? A32) Vendor choice Q33) Are the signals to be filtered before storage? A33) Vendor choice Q34) For ?Isolated Temperature? is a differential input with ground desired? A34) Yes Q35) By ?real time viewing? is it desired to view the data externally as it is being collected by the DAS? What is the maximum distance required to the exte rnal device . Is a wireless connection to the external device envisioned? A35) Yes. Whatever ethernet or firewire will allow. Yes. Q36) Power supply to the Signal Conditioning unit? Please clarify. A36) No external supply for any signal conditioning is required. Q37) Number of Signal Conditioning - Please Clarify A37) This is not a specification included in the solicitation. Q38) Bandwidth - what is the highest bandwidth and oversampling. A38) No maximum. As high as the vendor is able to provide. Q39) Would the Army like us to provide an alternate quotation for the minimum 48 channel system as well? A30)Yes, please provide quote(s) on any systems that meet the specifications in the solicitation. Q40)Is there an incumbent for this project ? The specifications seem to be tailored for a particular product. Or are you looking for a custom Data Acquisition System ? A40) There is no incumbent. We are looking for a system that meets the specifications listed in the solicitation. Q41) Have you previously procured this item from anyone / If so, whom and for what cost? A41) No, we have not previously procured this specific item.
- Place of Performance
- Address: ACA, Yuma Proving Ground Directorate of Contracting, Buidling 2100, Ocotillo Street Yuma AZ
- Zip Code: 85365-9106
- Country: US
- Zip Code: 85365-9106
- Record
- SN00291741-W 20030402/030331213455 (fbodaily.com)
- Source
-
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