Capacity exceeding 10,000 pounds but not exceeding 112,000 pounds: 213.045g Tension and compression. Capacity exceeding 112,000 pounds but not exceeding 300,000 pounds: Compression. 213.045h Tension. 213.045i Tension and compression. 213.045j Capacity exceeding 300,000 pounds but not exceeding 1,000,000 pounds: Compression. 213.045k Tension. 213.045& Tension and compression. 213.045z Special measurements not covered by this schedule. 213.210 General. (a) Direct inquiries to, and mark shipments for the attention Pressure Measurements Section, MET A153, National andards, Washington, DC 20234. Telephone: 301-921-2177. Bureau of (b) Fees for the services described in this schedule have not en fixed and charges will be made for actual costs incurred which usually 11 not exceed $1,000. 3.211a Deadweight piston gages other than controlled clearance gages (also called deadweight gage testers and pressure balances). Determination of effective area of the piston by comparison with a pressure standard, up to five test points at room temperature, 20 to 25 °C. Pressure fluid may be air, up to 600 psi, petroleum oil up to 60,000 psi, or synthetic lubricant (dioctyl sebacate) up to 120,000 psi. Determination of effective area requires previous weighing of piston assembly and the use of calibrated weights. If the Bureau has weights to fit, the gage may be calibrated using NBS weights. 3.211b 3.211c 3.211d 3.211e Controlled clearance piston gages. Determination of effective area, jacket pressure for zero clearance, and variation of effective area with jecket pressure. Test is made on an assembly of piston, cylinder, and jacket, not to be disassembled later. Determination of effective area requires previous weighing of piston assembly and the use of calibrated weights. If the Bureau has weights to fit, the gage may be calibrated using NBS weights. Inquiry should be made as to the parts to be submitted. Barometers, Fortin or similar types, range 28 to 31 in. Hg, tube Manometers, manually operated, with tube bore 0.5 in. or greater, Manometers, with tube bore 0.5 in. 3.211z Special measurements not covered by this schedule (for example, calibration of pressure gages of high precision and stability). 213.220 General. Direct inquiries to, and mark shipments for the attention of: Vacuum Measurements Section, MET - A153, National Bureau of Standards, Washington, DC 20234. Telephone: 301-921-2196. 213.221a 213.221z Vacuum gages, in range 1 to 1,000 millitorr, of high stability such as diaphragm and quartz Bourdon tube types. * Test at room temperature (20 to 25 °C). Special measurements not covered by this schedule. Vibration Measurements 213.230 General. Direct inquiries to, and mark shipments for the attention of: Vibration Measurements Section, EM - 103, National Bureau of Standards, Washington, DC 20234. Telephone: 301-921-2533. 213.231 Vibration pickups. (a) This applies to the calibration of velocity and acceleration types of vibration pickups. A Report of Calibration will be issued. a (b) Each piezoelectric acceleration pickup which is used with cathode-follower or amplifier shall be accompanied by the cathode-follower or amplifier, the power supply if other than batteries, and the output and connecting cables. (c) When instruments submitted are found to be unsuitable for test or unreliable, a charge will be made to cover the cost of the work done. For each test frequency in excess of 10, an additional charge equal to one-tenth of the fee will be made. *McLeod gages are not accepted by NBS for calibration because use of a McLeod gage as a reference instrument depends on dimensional and volumetric measurements of the instrument made prior to assembly and on use of appropriate corrections, particularly capillary depression fluctuations, determined periodically during use. Thus, a calibration by comparison is considered to be of little value in the use of this type of instrument as a reference standard. 13.231a 13.231b Dynamic calibration of acceleration pickups weighing up to 4 Determination of three acceler Dynamic calibration of piezoelectric acceleration pickups weighing up to 4 ounces in the frequency range of 10 Hz to 2,000 Hz at double displacement amplitudes up to 0.4 inch or accelerations up to 10g, whichever is less. The pickup is subjected to sinusoidal motion on an electrodynamic vibration standard previously calibrated by the reciprocity method. The estimated errors of the applied accelerations do not exceed 1% for frequencies up to 900 Hz and 2% above 900 Hz. Determination of the magnitude of the calibration factor up to three acceleration levels is performed at two of these frequencies. 13.231z Special measurements not covered by this schedule, such as dynamic calibrations of pickups weighing more than the weights given above, calibrations of small light-weight piezoelectric ceramic pickups over an extended frequency range up to 20,000 Hz, calibrations at higher accelerations, or calibrations of velocity pickups. Humidity Measurements 213.240 General. Direct inquiries to, and mark shipments for the attention of: umidity Measurements Section, META153, National Bureau of Standards, ashington, DC 20234. Telephone: 301-921-2794. 213.241 Humidity instruments. (a) Instruments of high accuracy and stability suitable for use laboratory or plant standards are accepted for calibration. (b) Ordinarily instruments are calibrated with air of known isture content. (c) Calibrations can be furnished in terms of mperature, mixing ratio, volume ratio, and relative humidity. dewpoint spondence regarding the exact nature of the user's requirements. Requests for calibration should be accompanied with technical information on the type of instrument, manufacturer, operating range(s), and number of test points required. Instruments should not be forwarded to the Bureau until all arrangements for test have been completed. (e) When instruments submitted are found to be unsuitable for test or unreliable, a test may be discontinued and a charge will be made to cover the cost of the work done. 213.241a 213.241b 213.241c 213.241d 213.241e - 213.241f 213.241g 213.241h Dewpoint hygrometers, automatic operation: Calibration at six test points in the dewpoint temperature range of +25 to -15 °C. Calibration at nine test points in the dewpoint temperature range of 15 to -70 °C. Dewpoint hygrometers, manual operation: Calibration at six test points in the dewpoint temperature range of +25 to -15 °C. Calibration at nine test points in the dewpoint temperature range of -15 to -70 °C. Coulometric hygrometers: Calibration at six test points in the range 30,000 to 1,000 ppm (by volume). Calibration at nine test points in the range 1,000 to 40 ppm (by volume). Calibration at six test points in the range 30 to 2 ppm (by volume). Pneumatic bridge hygrometers: Calibration at five test points in mixing ratio range 14 to 0.4g the H20/kg dry air. 2 213.241z Electric hygrometers and special measurements not covered by this schedule. Fluid Meters for Liquids and Gases 213.310 General. Direct inquiries to, and mark shipments for the attention of: Fluid Mechanics Branch, Hydraulics - 201, National Bureau of Standards, Washington, DC 20234. Telephone: 202-EM 2-4040-7241. |