Capacity exceeding 111,000 lb but not exceeding 200,000 lb:

206.045g

Compression..

(*)

206.045h

Capacity exceeding 200,000 lb but not exceeding 300,000 lb:
Compression.

(*)

206.045z

For special tests not covered by the above schedule, fees will be
charged dependent upon the nature of the tests---

206.211a

206.211b

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. Fee usually does not exceed $1,000.00. Work
to be charged at cost...

Controlled clearance piston gages. Determination of effective area,
jacket pressure for zero clearance and variation of effective area
with jacket 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. Fee usually does not
exceed $1,000.00. Work to be charged at cost _ _

Fee

206.211c

206.211d

206.211e

206.211z

Barometers, Fortin or similar types, range 28 to 31 in. Hg, tube
bore 0.5 in. or greater, calibration at room temperature (20 to 25 °C)
and atmospheric pressure. Fee usually does not exceed $1,000.00.
Work to be charged at cost-

Manometers, manually operated, with tube bore 0.5 in. or greater, in
which both mercury surfaces are observed. Range to 100 in. Hg,
calibration test at room temperature (20 to 25 °C) up to 10 test
points. Fee usually does not exceed $1,000.00. Work to be
charged at cost..

Manometers, with tube bore 0.5 in. or greater, in which both mercury
surfaces are observed and of design which permits calibration in
terms of length, temperature, etc. Calibration of scale and
thermometer, performance verified by comparison with pressure
standard. Fee usually does not exceed $1,000.00. Work to be
charged at cost.

For special tests not covered by the above schedule (for example, cali-
bration of pressure gages of high precision and stability), work
to be charged at cost.

Vacuum Measurements

206.221 Vacuum measurements.

Item

206.221a

206.221z

Description

Vacuum gages,
in range 1 to 1000 millitorr, of high stability such as
diaphragm and quartz Bourdon tube types.* Test at room tem-
peratures (20 to 25 °C). Fees will be charged on basis of cost. ---

For special tests not covered by the above schedule, fees will be
charged dependent upon the nature of the tests.

Fee

*McLeod gages are not accepted by NBS for calibration, because use of a McLeod gage as a reference instrument depends upon dimensional and volumetric measurements of the instrument made prior to assembly, and upon use of appropriate time-varying corrections, particularly capillary depression fluctuations, determined periodically during use. A calibration by comparison is thus considered to be of little value in use of this type of instrument as a reference standard.

Vibration Measurements

206.231 Vibration pickups.

(a) This applies to the calibration of displacement, velocity, and acceleration types of vibration pickups. A report of calibration is issued.

(b) Each piezoelectric acceleration pickup which is used with a 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.

784-291 065- 8

(c) Each piezoelectric acceleration pickup whose output is read directly with a highmpedance meter can be but need not be accompanied by the meter, but shall be accompanied y the output cable and suitable shielded connector.

(d) When instruments submitted are found to be unsuitable for test or unreliable, a charge vill be made to cover the cost of the work done.

Item

Description

Fee

06.231a

206.231b

206.231c

206.231d

Static calibration on a tilting support in the earth's gravitational
field for accelerations up to 1 g, the acceleration of gravity, with
an error not greater than 0.001 g. Calibration for 10 different
applied accelerations__

Static calibration on a centrifuge at four different applied accelera-
tions up to 80 g
for not more than two orientations with an esti-
mated error not greater than 0.2 percent of the applied accelera-
tion (eight calibration points). Acceleration will be determined
at radii measured to designated reference points on the pick up

case_

For additional tests or measurements required to determine location of seismic
mass, fees will be charged to cover the cost of work done.

Dynamic calibration of velocity pickups weighing up to 2 lb in the
frequency range from 10 to 2,000 Hz at double displacement
amplitudes up to 0.4 in. or accelerations up to 10 g, whichever is
less. The pickup is subjected to sinusoidal motion on an electro-
dynamic vibration standard previously calibrated by the reci-
procity method. The estimated errors of the applied accelera-
tions do not exceed 1 percent for frequencies up to 900 Hz and
2 percent above 900 Hz. The magnitude and phase angle of the
calibration factor are determined at up to 10 frequencies. The
magnitude of the calibration factor is determined for up to three
accelerations at each frequency (up to 30 calibration points)..

For each test frequency in excess of 10, an additional charge equal to one-tenth
of the fee is made.

Dynamic calibration of acceleration and displacement pickups weigh-
ing up to 2 lb in the frequency range of 10 to 2,000 Hz at double
displacement amplitudes up to 0.4 in. or accelerations up to 10 g,
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 percent for frequencies up to 900 Hz
and 2 percent above 900 Hz. The magnitude and phase angle
of the calibration factor are determined at up to 10 frequencies.
The magnitude of the calibration factor is determined for up to
three accelerations at each frequency (up to 30 calibration points) _ _

For each test frequency in excess of 10, an additional charge equal to one-tenth of
the fee is made.

See footnote at end of table.

(*)

(*)

(*)

(*)

206.231e

206.231z

Dynamic calibration of piezoelectric acceleration pickups weighing
up to 4 oz in the frequency range of 10 to 2,000 Hz at double dis-
placement amplitudes up to 0.4 in. or accelerations up to 10 g,
whichever is less, or if requested, up to 20 g at two unspecified
frequencies. The pickup is subjected to sinusoidal motion on an
electrodynamic vibration standard previously calibrated by the
reciprocity method. The estimated errors of the applied accelera-
tions do not exceed 1 percent for frequencies up to 900 Hz and 2
percent above 900 Hz- The magnitude of the calibration factor
is determined for up to three accelerations at up to 10 frequencies
within a specified range (up to 30 calibration points)___

For each test frequency in excess of 10, an additional charge equal to one-tenth of
the fee is made.

For special tests not covered by the above schedule, such as dynamic
calibrations of pickups weighing more than 2 lb, calibrations of
small lightweight piezoelectric ceramic pickups over an extended
frequency range up to 20,000 Hz, or calibrations at higher accelera-
tions, fees will be charged dependent on the nature of the test - -

*For current fees, see Appendix C.

(*)

Humidity Measurements

206.241 Humidity instruments.

(a) Instruments of high accuracy and stability suitable for use as laboratory or plant standards are accepted for calibration.

(b) Instruments ordinarily are calibrated with air of known moisture content.

(c) Calibrations can be furnished in terms of dewpoint temperature, mixing ratio, volume ratio, and relative humidity.

(d) Acceptance for test is based on consultation or correspondence 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 National Bureau of Standards 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.

Item

Description

Fee

Dewpoint hygrometers, automatic operation:

206.241a

Calibration at six test points in the dewpoint temperature range of
+25 to -15 °C.___.

(*)

206.241b

Calibration at nine test points in the dewpoint temperature range of
-15 to -70 °C...

(*)

See footnote at end of table.

Dewpoint hygrometers, manual operation:

06.241c

Calibration at six test points in the dewpoint temperature range of
+25 to -15 °C..

(*)

06.241d

Calibration at nine test points in the dewpoint temperature range of
-15 to -70 °C.....

(*)

Coulometric hygrometers:

06.241e

Calibration at six test points in the range 30,000 to 1,000 ppm (by
volume)..

(*)

06.241f

Calibration at nine test points in the range 1,000 to 40 ppm (by
volume)___

(*)

06.241g

Calibration at six test points in the range 30 to 2 ppm (by volume)__
Pneumatic bridge hygrometers:

(*)

06.241h

Calibration at five test points in the mixing ratio range 14 to 0.4 g
H2O/kg dry air.

(*)

Electric hygrometers:

06.241i

Calibration at test points from 24 to 98 percent relative humidity in
the ambient temperature range from 30 to 15 °C, for a set of approx-
imately 12 test points per temperature. The number of test points
will depend on the response time of the humidity sensor...

(*)

06.241j

06.241k

06.2411

Calibration at test points from 10 to 24 percent relative humidity in
the ambient temperature range from 30 to 15 °C, for a set of approx-
imately 5 test points per temperature. The number of test points
will depend on the response time of the humidity sensor__

Calibration at test points from 24 to 98 percent relative humidity in
the ambient temperature range from 15 to 0 °C, for a set of approx-
imately 9 test points per temperature. The number of test points
will depend on the response time of the humidity sensor..

Calibration at test points from 10 to 24 percent relative humidity in
the ambient temperature range from 15 to 0 °C, for a set of approxi-
imately 5 test points per temperature. The number of test points
will depend on the response time of the humidity sensor...

(*)

(*)

(*)

06.241z

For special tests not covered by the above schedule, fees will be
charged on a cost basis...

*For current fees, see Appendix C.