Author Topic: NATIONAL MEASUREMENT STANDARDS  (Read 4755 times)

SeanB

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NATIONAL MEASUREMENT STANDARDS
« on: June 16, 2013, 12:15:30 PM »
Was looking through the big pile of paper Gazettes and found this one, that has a list of the primary standards in South Africa.  Gazette 36486 dated 31 May 2013.

Interesting are the electrical master standards, which are quite complex.

Electricity
 Electric potential: A 10 V Josephson Voltage Standard, No. ME-106/5.

Electric resistance: A series of eight Leeds and Northrup Type 4210 1R resistors,
 
Electric capacitance: A series of capacitors:
  Four Andeen Hagerling Type AH1100 capacitors with nominal values from 1
  pF to 100 pF.
  Four General Radio Type 1409 capacitors with nominal values from 1 nF to 1
  uF.
  Two sets of Agilent Type 16380 capacitors, each set containing four
  capacitors, with nominal values from 1 pF to 10 uF.

Electric inductance : A series of six type 1482 inductors with nominal values from
  100 uH to 10 H.

Electric AC voltage: A series of four thermal converters (AC to DC):
  Type MJTC 301.
  Type MJTC 312 with 900 0 series resistor.
  Type MJTC 308 with 10 kO series resistor.
  Type MJTC 311 with 100 kO series resistor.
  A Holt 12 low voltage thermal converter.

Electric AC current: A series of AC to DC thermal converters with current shunts:
 
Electric AC power: A Zera COM 3000 AC power comparator.


Radio-frequency power:
 50 R measuring head, No. 50/01;
 50 R, 0 dBm power sensor HP 8485A.
50 R, -30 dBm power sensor HP 8485D, No. 3318A02445;
75 R measuring head, No. 75/01;
75 R power sensor, HP 8483A.
50 R, 0 dBm power sensor R & S NRV-Z55.
50 R, 0 dBm power sensor Agilent 8487A.
 50 R, -30 dBm power sensor Agilent 8487D.

Radio-frequency attenuation:
  Attenuator model WBCO 310

Radio-frequency impedance:
 A group of 50 R coaxial air-dielectric transmission lines:
 Connector-type PC-7 mm.
 Connector-type PC-3,5 mm.
 Connector-type N-7 mm.
 Connector-type K-2,92 mm.
 Connector-type PC-2,4 mm.

And one I have traceable calibrations to.....

Mass
A cylinder of platinum-iridium, replica No. 56 of the international prototype of the kilogram
(IPK).

Plus a whole host of other standards, including for the time conscious the 4 Caesium beam atomic clocks, one HP, one Agilent and 2 Symmetricom units.

Mr Eastwood

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Re: NATIONAL MEASUREMENT STANDARDS
« Reply #1 on: June 17, 2013, 02:35:21 PM »
I once saw a nice set of Leeds and Northrup's for sale on Ebay in a wooden box - I think you have to fill them with oil at the correct temperature to get the stated values.

When I got my meter calibrated earlier this year,  the guy showed me some mechanical standard threads that were to go out to a customer, and he'd dipped them in this weird green stuff that seals them from the air until they are needed -  I think the poor chap was glad to get rid of me with all the questions I kept asking! ;-)
Hey! Frisbee! Far out!

NeverDontLoveU

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Re: NATIONAL MEASUREMENT STANDARDS
« Reply #2 on: September 05, 2014, 04:15:41 AM »
Hopefully forever. Thank you for everything, Art.  It is appreciated.

GNU_Ninja

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Re: NATIONAL MEASUREMENT STANDARDS
« Reply #3 on: October 15, 2014, 03:33:19 AM »
Apparently, the standard kilogram in the UK has been putting on weight/mass :-D

http://www.npl.co.uk/news/cleaning-the-kilogram-for-the-bbc

SeanB

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Re: NATIONAL MEASUREMENT STANDARDS
« Reply #4 on: October 15, 2014, 12:34:52 PM »
Thought it was only people that put on extra mass as they get older.......... ;)


Mr Eastwood

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Re: NATIONAL MEASUREMENT STANDARDS
« Reply #5 on: October 15, 2014, 06:40:45 PM »
Thought it was only people that put on extra mass as they get older.......... ;)

lol
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