The Government of The Hong Kong Special Administrative Region
Contents
1. 3 8 4 Calibration charges Fee in HK 3 8 4 1 3 8 4 2 Calibration of an oscilloscope with 2 input channels for frequency range extending to 1 100 MHz 2970 Gi 500 MHz 3960 G 1 GHz 4950 Calibration for each additional input 840 channel of the same unit 3 9 Oscilloscope Calibrators 3 9 1 The Laboratory can provide calibrations for oscilloscope calibrators The calibration normally includes checks on amplitude output in the range 40 uV to 100 V and time mark output in the range 0 5 ns to 5 s 3 9 2 Calibration charges Fee in HK 3 9 2 1 3 9 2 2 2025 Calibration of an oscilloscope calibrator 4500 for amplitude and time mark outputs Calibration of an oscilloscope calibrator 2990 for amplitude output only Calibration of an oscilloscope calibrator 2990 for time mark output only 3 10 Fixed and Step Attenuators 3 10 1 The Laboratory offers calibration service for coaxial fixed and step attenuators The frequency range covers 300 kHz to 18 GHz and attenuation range of 0 to 70 dB 3 10 2 Calibration charges Fee in HK 3 10 2 1 Calibration of fixed attenuator at 6 1970 frequencies 3 10 2 2 Calibration of step attenuator for a 1970 combination of 6 frequency attenuation test points 3 10 2 3 Calibration at each additional 250 frequency attenuation combination 3 11 3 12 29 Electronic Timer 3 11 1 The Laboratory offers calibration service for electronic timers with time2. In general measurements will be made in air at nominal ambient temperature of 23 C and relative humidity of 45 Customers may specify their required test voltage between 100 V and 1 kV Measurement uncertainties will vary with test voltages and resistance Calibration charges 1 3 3 1 1 3 3 2 1 3 3 3 1 3 3 4 Measurement of resistance of a high value standard resistor in the range 100 MQA to 1 TO at one test voltage Measurement of resistance of the same resistor at each additional test voltage Measurement of resistance for all settings of the first decade of a high value decade resistance box Measurement of resistance for all settings of each additional decade of the same resistance box Current Carrying Resistors Current Shunts 1 4 1 1 4 2 1 4 3 1 4 4 Fee in HK 2850 970 8130 2710 Four terminal current carrying standard resistors in the range 0 1 mQ to 1 Q can be calibrated The maximum test current is 100 A at 0 1 mQ but becomes smaller at higher resistance values At 1 it is limited to 1 A Resistors suitable for oil immersion will normally be measured in a constant temperature oil bath at 23 C Air cooled resistors will be measured in air at an ambient temperature of 23 C Resistors are usually measured at 50 of their rated currents If other current levels are required customers should specify their particular requirements Calibration charges 1 4 4 1
3. 1 4 4 2 Measurement of resistance for a current carrying resistor at one test current Measurement of resistance for the same current carrying resistor at each additional test current Fee in HK 2410 1000 1 5 1 6 1 7 DC Volt Ratio Boxes 1 5 1 1 5 2 Volt ratio boxes rated up to 1000 V are usually calibrated at rated voltage against the Laboratory s standard Calibration charges Fee in HK 1 5 2 1 Measurement of the first ratio 1920 1 5 2 2 Measurement of each additional ratio on the 450 same box DC Voltage Calibrators 1 6 1 1 6 2 DC voltage calibrators with ranges from 10 mV to 1000 V can be calibrated The basic measurements will include measurement of output voltage at full range settings for each range and linearity check at 5 voltage levels for one range Linearity check for other ranges can be offered at extra charge Calibration charges Fee in HK 1 6 2 1 Calibration of a DC voltage calibrator with 3800 not more than 5 ranges 1 6 2 2 Measurement at full range setting for each 430 additional range for calibrators with more than 5 ranges 1 6 2 3 Each additional linearity check 1180 DC Potentiometers 1 7 1 1 7 2 1 7 3 If the potentiometer under test has its own internal voltage reference and power supply these will be used unless they are found to be unstable Generally the calibration procedure recommended in the manufacturer s service manual will be
4. e an extra fee may be payable for such adjustments and re calibration after adjustments The Government including its officers employees contractors and agents shall not be liable for any loss destruction or damage including without limitation consequential loss destruction or damage however arising from or in respect of the use or non issue of any certificate and or report referred to in para 2 any loading unloading carriage transportation assembling packing unpacking evaluation testing calibration use non use or misuse of the equipment referred to in para 1 6 in any period while the equipment is in the applicant s or the Government s or the Government s contractors custody possession or control including any period of loading unloading carriage and transportation on any route to from or at any laboratory premises or property used for or in connection with the calibration of the equipment or the provision of any calibration service other than caused by the fraud or malicious act of the Government its officers employees contractors or agents The applicant is advised and acknowledges that advice to take out adequate insurance including but not limited to goods in transit insurance to cover the risks of any loss destruction or damage excluded by this condition The Government shall not be regarded as a common carrier or bailee for reward or otherwise in respect of the provision of the calibration service
5. including any loading unloading carriage or transportation of the equipment Certificate of Calibration 2 1 2 2 2 3 A Certificate of Calibration will normally be issued to the customer upon completion of the calibration The results given in the Certificate only relate to the values measured at the time of the calibration and in the environmental conditions at the time Any quoted measurement uncertainties will not include allowance for the equipment long term drift variations with environmental changes vibration and shock during transportation or the capability of any other laboratory to repeat the measurement The Government of the Hong Kong Special Administrative Region owns the copyright of the Certificate of Calibration Such certificate shall only be reproduced in full unless prior written approval is obtained from the Head of SCL Procedure for Requesting Calibration Service 3 1 3 2 3 3 3 4 3 5 A prospective customer wishing to use the calibration service should contact SCL either by phone e mail fax or letter stating their requirements SCL will then send an official quotation together with an Application for Calibration form The conditions of service are set out on page 2 of the form If the customer wishes to proceed with the calibration he should contact SCL to arrange a date for the delivery of the equipment A crossed cheque made payable to the The Government of the Hong Kong Special Ad
6. 5930 7420 7420 4 5 4 4 4 Thermocouples 4 5 1 4 5 2 4 5 3 4 5 4 4 5 5 4 5 6 33 Calibration charges 4 4 4 1 4 4 4 2 4 4 4 3 4 4 4 4 Calibration at one temperature Calibration at each additional temperature Additional charge if any of the above test temperatures exceed 230 C Calibration for an additional probe for each temperature temperature same as per 4 4 4 1 and 4 4 4 2 Fee in HK 2240 540 980 200 Thermocouples will be calibrated by comparison with Laboratory standards in constant temperature baths or furnaces The reference junction will be kept at 0 C The inhomogeneity of the thermocouple wire will normally be evaluated to assess its effect on the calibration uncertainty The thermal emfs of the thermocouple at the measuring temperatures will be determined and fitted to a polynomial The coefficients of the polynomial will be reported For thermocouples bearing serial numbers or markings for identification certificates of calibration will be issued Otherwise calibration reports will be issued instead Thermocouples submitted should be no less than 1 m in overall length Calibration charges 4 5 6 1 4 5 6 2 4 5 6 3 Calibration at one temperature Calibration at each additional temperature Additional charge if any of the above temperatures exceed 230 C Fee in HK 2420 570 980 34 4 6 Temperature Logge
7. Calibration charges Fee in HK 2 6 4 1 Calibration of single range on AC ammeter 1430 at one frequency 2 6 4 2 Calibration of each additional range at full 160 range on the same AC ammeter at one frequency 2 6 4 3 Additional linearity check at one frequency 700 per range 2 6 4 4 Calibration at each additional frequency i First range 5 test currents 700 Gi Each additional range at full range 160 AC Current Calibrators 2 7 1 The Laboratory offers calibrations for AC current calibrators or transconductance amplifiers with output in the range 100 uA to 20 A and 20 Hz to 20 kHz At power frequencies 45 Hz to 60 Hz the measuring range can be extended to 100 A However the calibrator under test must be capable of driving inductive loads as precision current transformers will be used for the measurements in this extended range 2 7 2 Calibration charges Fee in HK 2 7 2 1 o Calibration for the first current value i atone frequency 3090 ii at each additional frequency 520 2 7 2 2 Calibration for each additional current value i at one frequency 680 ii at each additional frequency 520 Wattmeters 2 8 1 The Laboratory offers calibration for single phase wattmeters at fixed frequencies of 50 Hz 60 Hz or 400 Hz and in the power factor range of unity to 0 5 leading or lagging 2 8 2 Wattmeters will be calibrated by direct comparison method against the Laboratory standard wattmeter with p
8. Where the calibration service cannot be provided or completed for whatever reason a full or partial refund of the fee paid may or may not be made to the applicant depending on the time and effort if any expended in providing the calibration service including any loading unloading carriage or transportation of the equipment as the Head of SCL may in his discretion determine The term calibration refers to the set of operations which establish under specified conditions the relationship between values indicated by a measuring instrument or measuring system or values represented by a material measure and the corresponding known values of the measurement standards maintained by SCL Unless otherwise stated the fees quoted by SCL for the calibration of an equipment will not include adjustment of the equipment In certain circumstances and at the discretion of SCL minor adjustments to the equipment may be made to improve its performance or to bring it within specification However this will only be done upon special request by the applicant and on the following conditions a the adjustment procedure is relatively straight forward b the procedure is clearly documented in the submitted service manual c the procedure will not result in a significant increase in the time required to complete the calibration 1 10 d the equipment is accompanied by all the necessary accessories required to perform the adjustment and
9. test Bearing pad test 2380 Variable voltage test 1020 48 Calibration charges 6 2 2 For force measuring instruments in measuring range above 60 KN up to 3 MN 6 2 2 1 Tension test including overloading test 6 2 2 2 Compression test including overloading test 6 2 2 3 Bearing pad test 6 2 2 4 Variable voltage test Fee in HK 4760 4760 3060 1360 49 7 HUMIDITY LABORATORY Enquiry Telephone 2829 4842 7 1 General Humidity is a measure of the water vapour present in the air or in other gases Because of the very wide interest in humidity it is expressed in many different but inter related ways Those interested in very low concentrations for instance would probably express their measurements in parts per million others concerned with higher levels of humidity are more likely to specify dew point or partial pressure of water vapour and those interested in the effect of water vapour on materials usually prefer measurements in relative humidity The Laboratory maintains the official reference standards of humidity measurements for Hong Kong The Laboratory provides calibration services for the following types of instruments a Dew point instruments Range 60 C to 65 C b Psychrometers c Electronic relative humidity instruments d Thermohygrographs Temperature and humidity recorders For b c and d the temperature and humidity ranges are interrelated The
10. 2 3 4 3 Fee in HK 3560 4760 5930 480 The Laboratory can provide calibrations for RF millivoltmeters in the range 2 2 uV to 2 2 V for frequency from 100 Hz to 1 GHz The calibration will normally include a Measurement at one frequency for selected levels normally at 20 dB step and b Measurement at one voltage level normally 1 V for a specified number of different frequencies determine the calibration fee Calibration charges 3 4 3 1 3 4 3 2 Calibration of RF millivoltmeter i 6 test frequencies ii 12 test frequencies G 18 test frequencies Calibration at each additional frequency voltage level combination The number of frequencies tested will Fee in HK 2970 3950 4950 400 26 3 44 RF voltmeter with frequency limit beyond 1 GHz will be charged as RF power meters in Section 3 3 3 5 Oo Signal Generators 3 5 1 The basic calibration of a RF signal generator normally includes tests on output level accuracy level flatness and frequency accuracy 3 5 2 Internal modulation AM and FM check and time base calibration can be provided at extra charge 3 5 3 Calibration charges Fee in HK 3 5 3 1 Calibration of a signal generator with frequency range extending to i 2 GHz 3320 ii 4 GHz 4410 G 8 GHz 5510 iv 12 GHz 6590 v 18 GHz 7730 3 5 3 2 Additional time base calibration on the 1110 same unit 3 5 3 3 Additional inter
11. and pressure transmitters The Laboratory can also provide gas pressure calibration services in both absolute and gauge modes from 20 kPa 0 2 bar to 7 MPa 70 bar 5 6 5 5 3 5 5 4 5 5 5 5 5 6 5 5 7 5 5 8 Torque 5 6 1 5 6 2 44 The submitted instrument should be in a clean condition For gas pressure calibration the pressure medium will be nitrogen Calibration is generally performed by applying pressures of known values to the unit under test in sufficient number of steps normally about 7 distributed throughout its usable range from lower test values to maximum calibration value and then decreased backwards to initial test value Electronic barometer can also be calibrated by this Laboratory provided that the electronic barometer has a connection for input pressure Calibration is performed at five points from 800 hPa to 1100 hPa under both rising pressure and falling pressure conditions The pressure connections of the submitted instruments should be as follows N P T B S P A P I Metric 1 8 in 1 8 in 1 8 in M12 x 1 5 1 4 in 1 4 in 1 4 in M20 x 1 5 3 8 in 3 8 in 3 8 in 1 2 in 1 2 in 1 2 in Calibration charges Fee in HK 5 5 8 1 O Pressure gauge 3270 5 5 8 2 O Pressure transducer or transmitter 3270 5 5 8 3 Electronic barometer 3060 Enquiry Telephone 2829 4835 The Laboratory can provide calibration services for manually operated torque wrenches and drivers mechanical torque testers e g
12. base output or accessible electronic start stop trigger The calibration of electronic timer normally includes time base measurement if available and 6 time interval measurements 3 11 2 Calibration charges Fee in HK 3 11 2 1 Calibration of electronic timer 2970 3 11 2 2 Additional measurement of each time 290 interval Watch Stop Watch 3 12 1 3 12 2 The Laboratory offers calibration service for watches stop watches with internal crystal and step motor The calibration of watches stop watches includes the measurement of its relative frequency accuracy Calibration charges Fee in HK Calibration of watch stop watches 1360 30 4 TEMPERATURE LABORATORY Enquiry Telephone 2829 4842 4 1 General The SI unit of the fundamental physical quantity temperature or more precisely thermodynamic temperature is the kelvin defined as the fraction 1 273 16 of the thermodynamic temperature of the triple point of water Because of the way earlier temperature scales were defined it remains common practice to express a temperature in terms of its difference from 273 15 K the ice point A thermodynamic temperature T expressed in this way is known as Celsius temperature symbol t defined by t in C T Gin K 273 15 The precise measurement of thermodynamic temperatures for example with a gas thermometer is very difficult Practical temperature scales were therefore introduced to make use of instruments such as pl
13. eguipment AC Voltage Calibrators 24 1 2 4 2 2 4 3 The method used for calibrating AC voltage calibrators will depend on the required accuracy and bandwidth of the unit under test For highest accuracy the calibrator will be calibrated using AC DC transfer technique In general measurements will be restricted to the 0 25 V to 1000 V range and frequencies 40 Hz to 1 MHz The calibration of a precision AC voltage calibrator will basically include a Measurement of output voltage at full range for each range at one frequency b Linearity check at 5 voltage levels on one range at the same frequency as in a 2 5 2 4 4 Additional voltage measurement at other frequency settings as well as frequency accuracy check may be offered at extra charge 24 5 Calibration charges Fee in HK 2 4 5 1 Basic calibration of an AC voltage 6220 calibrator 2 4 5 2 Voltage measurement at each additional 630 frequency voltage combination 2 4 5 3 Frequency accuracy check at 6 different 990 frequency settings at one voltage level normally at 1 V AC Voltmeters 2 5 1 Analogue and digital AC voltmeters covering the ranges 1 mV to 1000 V and 20 Hz to 1 MHz lt 2 x 10 V Hz will normally be calibrated against the Laboratory AC voltage calibrators 2 5 2 AC voltmeters will normally be calibrated at 5 test voltages for one range to establish the scale linearity For multi range voltmeters additional measurements will be made at
14. followed Calibration charges Fee in HK 1 7 3 1 Test on potentiometer with a degree of 7610 sub division not exceeding 1 in 200 000 1 7 3 2 Test on potentiometer with a degree of 10160 sub division exceeding 1 in 200 000 but not exceeding 1 in 2 000 000 1 8 DC Voltmeters 1 8 1 The Laboratory offers calibrations for DC voltmeters rated from 100 uV to 1 kV Single range voltmeters are normally calibrated at cardinal points maximum 10 test points For multi range voltmeters the basic calibration will include measurements at full ranges and linearity check at 5 voltage levels for one range Linearity check for other ranges can be offered at extra cost 1 8 2 Calibration charges 1 8 2 1 1 8 2 2 1 8 2 3 1 8 2 4 1 9 DC Ammeter Calibration of a single range DC voltmeter Calibration of a multi range DC voltmeter with not more than 5 ranges Calibration at full range for each additional range for voltmeters with more than 5 ranges Each additional linearity check Fee in HK 1920 2850 330 980 1 9 1 The Laboratory offers calibrations for DC ammeters rated from 10 uA to 100 A 1 9 2 The DC ammeter will normally be calibrated at full range in each range 1 9 3 Calibration charges 1 9 3 1 1 9 3 2 1 9 3 3 Calibration at full range for DC ammeters with not more than 3 ranges Calibration at full range for each additional range on the same DC ammeter for ammeters with more t
15. maximum ranges are temperature 5 C to 70 C humidity 8 to 95 RH 7 2 Dew point Hygrometers 7 2 1 1 2 2 In a dew point hygrometer air to be tested is drawn through a chamber containing a clean and highly polished mirror A beam of light is directed on to the mirror and the reflected beam is monitored electronically in order to detect and control the formation of dew or frost To calibrate a dew point hygrometer a stream of low flow rate air generated by a standard humidity generator and at the specified dew point temperature is passed through both the UUT and reference dew point hygrometers which are then compared 7 3 7 4 123 50 Calibration Fee in HK 7 2 3 1 Calibration at one dew charges point 2240 temperature 7 2 3 2 Calibration at each additional dew point 810 temperature Psychrometers 7 3 1 eyl 7 3 3 7 3 4 In a psychrometer two temperature sensing elements are exposed to a stream of air they are usually platinum resistance elements or mercury in glass thermometers One of the elements the wet bulb is covered by a closely fit sleeve of a material such as cotton which is thoroughly moistened with water The other element the dry bulb is uncovered and dry The wet and dry temperatures are used to compute the relative humidity Electronic psychrometers contain electric thermometers and usually incorporate a processor so the relative humidity can be calculated from the dry and
16. measuring range from 0 5 KN to 3 MN Calibration of force measuring instruments of measuring ranges from 0 5 KN to 60 KN will generally be performed by using the two deadweight machines which are capable of generating forces with an uncertainty of 0 002 For force measuring instruments of measuring ranges from 60 KN up to 3 MN calibration will normally be performed by using the two hydraulic force machines The uncertainties of the forces generated by these machines are 0 02 and 0 05 respectively The uncertainties quoted on the calibration certificate will include the uncertainties due to the instrument under test itself during the calibration Calibration of force measuring instruments would normally involve the following tests 6 1 5 1 Compression and or Tension Tests Calibration is based on clause 6 4 2 of BS EN 10002 3 1995 such that four series of calibration forces are applied to the force measuring instrument for each operation mode i e tension or compression For each measuring series the forces are applied in sufficient number of equal steps normally 10 distributed evenly throughout the usable range of the force measuring instrument 6 1 5 2 6 1 5 3 6 1 5 4 47 Overloading Test Prior to the calibration an overloading test will be performed in accordance with clause B 1 of Annex B of BS EN 10002 3 1995 such that the force measuring instrument is subject 4 times in succession to an overload of a
17. of the test sample for cleaning the density meter after the density measurements Calibration charges Fee in HK 5 7 3 1 Density determination of a liquid 1970 6 1 46 6 FORCE LABORATORY Force Measurement Enquiry Telephone 2798 7347 6 1 1 The SI unit of force is the newton N which is derived from the SI base units of mass kilogram length metre and time second Newton is the force that when applied to an object with a mass of one kilogram would give it an acceleration of one metre per second per second In practice it is not convenient to create an acceleration of one metre per second per second on an object having a mass of one kilogram in order to realise the standard of force of one newton Instead the practical realisation of the unit of force makes use of known masses deadweights which will produce a known force when subjected to the effect of local acceleration due to gravity Machines which generate force in this way are called deadweight machines The Force Laboratory is equipped with four force standard machines The two smaller machines are deadweight machines of rated capacities of 5 kN and 60 kN respectively The two larger machines which work on hydraulic amplification principle generate forces up to 3 MN by amplifying the force generated from the 60 KN deadweight machine The Force Laboratory provides calibration services for force measuring instruments such as proving rings and load cells in the
18. performed under prescribed circumstances producing the indentation ii the determination of a characteristic dimension of the indentation length measurement and iii the determination of the hardness value from the auxiliary quantity by employing the relevant equation defining the hardness testing method The Laboratory can provide hardness measurement of components and indirect verification of hardness testing machines of the following scales i Vickers ii Rockwell B amp C G Rockwell Superficial The indirect verification is performed by comparing the values indicated by the hardness testing machine with values of the standard hardness blocks at three points within the working range of the hardness testing machine The customer should be aware that several indentation marks will be present on the surface of the test specimen after the hardness measurement Calibration charges Fee in HK 5 4 6 1 Hardness measurement for one sample 1320 5 4 6 2 Per additional sample 330 5 4 6 3 Indirect verification of hardness testing 3950 machine 5 5 Pressure Enquiry Telephone 2829 4835 5 5 1 5 5 2 The Laboratory is equipped with pressure balances pressure controllers and precision quartz Bourdon pressure gauges to provide pressure calibration services The Laboratory can provide oil pressure calibration services in the gauge mode from 2 3 MPa 23 bar to 84 MPa 840 bar for pressure gauges transducers
19. s standard thermometers against the observed temperature differences indicated by scale readings of the unit under test The measurements are carried out relative to a fixed base temperature 4 8 2 Calibration charges Fee in HK 4 8 2 1 Calibration at one temperature 2420 4 8 2 2 Calibration at each additional temperature 570 48 23 Additional charge if any of the above 980 temperatures exceed 230 C 4 9 Other Services 49 1 Fixed point cells such as a Triple point of argon b Triple point of mercury c Triple point of water d Melting point of gallium e Freezing point of indium f Freezing point of tin g Freezing point of zinc h Freezing point of aluminium i Freezing point of silver can be calibrated by comparison against SCL s fixed point cells Quotation can be provided upon request 4 9 2 Furnaces thermo switches thermocouple calibrators and other types of thermal sensing or measuring devices may also be calibrated Quotations can be provided upon receipt of details of the calibration requirements 5 1 36 5 MECHANICAL METROLOGY LABORATORY Enquiry Telephone 2829 4805 Dimensional Measurement 5 1 1 5 1 2 The base unit of length in the International Metric System SI is the metre which since 1983 is defined by the General Conference of Weights and Measures as The length of the path travelled by light in vacuum during a time interval of 1 299 792 458 of a second In accord
20. torque meter and electronic torque testers e g torque transducer from 0 05 to 1 000 Nm For torque wrench and driver calibration the reading of the test instrument will be compared against the reading of a standard torque transducer at or nearest to 20 60 and 100 of maximum capacity of the submitted instrument unless otherwise requested 5 6 3 5 6 4 45 For a precision torque tester the test device will be calibrated against the torque generated by weights hanging at the end of a beam Calibration is made by applying torque of known values to the test device in sufficient number of steps normally about 7 distributed throughout its usable range from lower test values to full scale capacity Calibration charges Fee in HK 5 6 4 1 Torque wrench driver or gauge 1550 5 6 4 2 Precision electronic or mechanical torque 3090 tester 5 7 Liquid Density Enquiry Telephone 2829 4835 5 7 1 5 7 2 5 7 3 The Laboratory can provide density determination service for liquids of densities in the range from 650 kg m to 1600 kg m using density meter The operating principle of the density meter is based on the change of the natural freguency of a hollow oscillator when filled with different samples The oscillator has a constant volume at a given temperature The natural frequency is related to the mass of the oscillator and hence the density of product contained in it The customer may be required to submit the solvent
21. wet element temperatures and displayed The psychrometers are calibrated by comparing against the Laboratory standards at the specified sets of temperature and humidity condition Calibration charges Fee in HK 7 3 4 1 Calibration at one humidity temperature 2240 combination 7 3 4 2 Calibration at each additional humidity 810 temperature combination Electronic Relative Humidity Instruments 7 4 1 1 4 2 Over the years devices other than the wet and dry bulb psychrometer have evolved which permit a direct measurement of relative humidity These sensors are for the most part electrochemical sensors which offer a degree of ruggedness compactness and electronic readout ability The two most widely used electronic relative humidity sensors are the lithium chloride condensation sensor and the electric impedance humidity sensor 7 5 51 7 43 These sensors are calibrated by comparing against the Laboratory standards at the specified sets of temperature and humidity condition 7 4 4 Battery operated units must be submitted with batteries which are in good working condition and fully charged It is advisable to submit the battery charger or AC DC adapter as well 7 45 Calibration charges Fee in HK 7 4 5 1 Calibration at one humidity temperature 2240 combination 7 4 5 2 Calibration at each additional humidity 810 temperature combination Thermohygrographs Temperature and Humidity Recorders 7 5 1 o Thermohygrog
22. 1 6 61 Surface plate 7030 5 1 6 62 Surface texture standard 1600 5 1 6 63 Per additional sample 850 5 1 6 64 o Toolmakers flat 1970 5 1 6 65 Vee block double vee per pair 3960 5 1 6 66 Vee block single vee per pair 2970 5 1 6 67 Vernier height gauge 2970 5 1 6 68 Vernier depth gauge 2100 Enquiry Telephone 2829 4835 The unit of mass is the kilogram and is defined as the mass of the International Prototype Kilogram maintained at the International Bureau of Weights and Measures BIPM in France A copy of the Prototype no 75 being of the same form and material is being kept by this Laboratory as the reference standard of mass for Hong Kong and for the dissemination of the unit of mass The Laboratory can provide calibration services for standard weights of class Ez and lower in the range from 1 mg to 10 kg and standard weights of class F and lower from 20 kg to 50 kg The classification of weights depends on their maximum permissible errors refer to the following table shape material construction and surface finish as described in the International Recommendation R111 Weights of classes Ej Eo Fi F2 M M2 M3 of the International Organisation of Legal Metrology OIML 40 pues Class E2 Class Fy Class F2 Class M Class M2 Class M3 ofMass mg mg emg mg mg mg 3 2 3 5 2 4 5 2 5 The submitted weights should be in a clean condition and housed in a suitable c
23. 35 5 1 6 36 5 1 6 37 5 1 6 38 5 1 6 39 5 1 6 40 5 1 6 41 5 1 6 42 5 1 6 43 5 1 6 44 5 1 6 45 5 1 6 46 5 1 6 47 5 1 6 48 5 1 6 49 5 1 6 50 5 1 6 51 38 Description Laser wavelength Length bar accessories Measuring microscope Micrometer head Micrometer setting rod Per additional piece Optical dividing head Optical flat per working face Optical parallels per set of 5 Optical projector Parallels per pair Pin gauge up to 10 pieces Per additional piece Plain gap gauge Plain plug gauge cylindrical setting standard gear measuring cylinder and roller Polygon up to 4 sides Per additional side Precision line scale up to 5 intervals Per additional interval Ring gauge Rotary table Rotary and inclinable table Sine bar table Sine centre Sine table compound Fee in HK 5100 5210 Upon Request 2100 1500 740 8650 1500 4210 Upon Request 2970 1600 170 2170 2170 2170 540 2970 200 2190 8650 11140 2970 2970 4950 5 2 Mass 5 2 1 9 2 2 39 Description Fee in HK 5 1 6 52 Spirit level 2590 5 1 6 53 Square Engineers try 2370 5 1 6 54 o Squareness tester 4850 5 1 6 55 Steel ball up to 12 balls 1970 5 1 6 56 Per additional ball 170 5 1 6 57 Straightedge up to 500 mm 2970 5 1 6 58 over 500 mm 5920 5 1 6 59 Straightedge toolmakers up to 500 mm 2100 5 1 6 60 over 500 mm 4210 5
24. The Government of The Hong Kong Special Administrative Region Standards and Calibration Laboratory Calibration Services TABLE OF CONTENTS INTRODUCTION Page No General Information 1 Procedure for Requesting Calibration Service 4 A Brief Introduction to the Hong Kong Laboratory 4 Accreditation Scheme HOKLAS SCOPE OF CALIBRATION SERVICES AND FEES Direct Current Measurement 6 Low Frequency Measurement 14 Radio Frequency Measurement 24 Temperature Measurement 30 Mechanical Measurement 36 Force Measurement 46 Humidity Measurement 49 CALIBRATION SERVICES 1 General Information 1 1 1 2 1 3 The Standards and Calibration Laboratory SCL of the Government of The Hong Kong Special Administrative Region is responsible for maintaining the reference standards of measurement for Hong Kong Through a non profit calibration service SCL provides traceability to its reference standards complying with the requirements of ISO IEC 17025 Standard The laboratories of SCL are situated at two different locations The main laboratories complex is located at Immigration Tower This complex includes Direct Current Laboratory Low Frequency Laboratory Radio Frequency Laboratory Acoustics laboratory Temperature Laboratory Humidity Laboratory Dimension Laboratory Mass and Related Laboratory The Force Laboratory is located at the G04 Public Works Central Laboratory Building 2B Cheung Yip Street Kowloon Bay Kowloon A
25. additional charges will be quoted upon request Calibration charges Fee in HK 2 11 3 1 Measurement of output voltages from a 2260 Withstanding Voltage Tester normally for not more than 2 output ranges 2 11 3 2 Measurement of output voltages from the 570 same equipment for each additional output range 2 11 3 3 Leak current detection accuracy test for 2260 the same equipment normally for not more than 7 leak current settings 2 11 3 4 Leak current detection accuracy test for 180 each additional leak current setting Capacitors 2 12 1 2 12 2 2 12 3 The Laboratory offers calibration of 2 and 3 terminal capacitors in the range from 10 pF to 1 11 uF including measurement of capacitance and dissipation factor Tests are normally made at a nominal ambient temperature of 23 C and unless otherwise specified the test frequency will be 1 kHz Tests at other frequencies in the range from 50 Hz to 10 kHz can be offered but with increased measurement uncertainty Calibration charges Fee in HK 2 12 3 1 Measurement of the capacitance of a 1970 standard capacitor at one frequency 2 12 3 2 Measurement of the capacitance at each 990 additional frequency for the same capacitor 2 12 3 3 Measurement of the capacitance and 2420 dissipation factor of a standard capacitor at one frequency 2 12 3 4 Measurement of the capacitance for all 2970 settings of the first decade of a decade capacitance box at one f
26. ance with the recommendation for the practical realisation of the above definition of the International Committee of Weights and Measures the Laboratory maintains the metre through the wavelength of the 633 nm radiation from an iodine stabilised helium neon laser This wavelength A is derived from the internationally agreed value for the frequency v of the radiation and the speed of light c 299 792 458 m s by the relation A c v Laser interferometer systems are now in widespread use in engineering metrology for the measurement of length displacement and other dimensional quantities Usually the measuring values of these systems are based on the wavelengths of the incorporated laser sources Hence in order to ensure that the high potential accuracy of these instruments is achieved the values of their wavelengths in vacuum must be known The Laboratory can provide calibration service for the measurement of the wavelength of any laser having a nominal wavelength of 633 nm Calibration is performed by comparing the wavelength of the laser under test with the wavelength of the standard iodine stabilised helium neon laser of the Laboratory The Laboratory can also provide calibration services for gauges measuring instruments and machines used to check and or measure length and geometrical parameters e g flatness parallelism straightness and squareness The Laboratory also provides services for measuring dimensions geometrical param
27. apped gas or impurities and excessive strain before calibration After examination the thermometer is allowed to be stabilised in a standard condition Calibration is usually commenced at the lowest test temperature and the chosen test points are calibrated sequentially At each test point readings are taken and compared with the Laboratory standards in constant temperature baths Calibration charges Fee in HK 4 2 3 1 Calibration at one temperature 1970 4 2 3 2 Calibration at each additional temperature 460 4 2 3 3 Additional charge if any of the above test 980 temperatures exceed 230 C Platinum Resistance Thermometers 4 3 1 4 3 2 4 3 3 Standard platinum resistance thermometers satisfying the requirements of the ITS 90 may be calibrated at the appropriate fixed points For such calibrations it is necessary that the sensor element be mounted and sealed in a glass sheath so that the distance from the tip of the element to the bottom of the head of the thermometer is at least 450 mm and the diameter of the glass sheath should not be greater than 8 mm Industrial platinum resistance thermometers designed for use as lower grade standards than those satisfying the requirements of the ITS 90 are calibrated by comparison with Laboratory standards The resistance ratios of the platinum resistance thermometer at the measuring temperatures will be determined and fitted to a polynomial The coefficients of the polynomial wil
28. asurement at full range decade values for all ranges 2 1 3 DMM s up to 7 1 2 digits are normally calibrated against the Laboratory precision DMM s or calibrators and the calibration charges applicable are listed in section 2 1 5 2 1 4 For DMM s of higher resolutions or requiring special test specifications or techniques for better measurement uncertainties calibration charges will be quoted upon request 2 1 5 Calibration charges Fee in HK 2 1 5 1 Calibration of two functions of a DMM up 2940 to 7 1 2 digits 2 1 5 2 Calibration for each additional 730 measurement function up to 7 1 2 digits 2 2 2 3 2 4 AC DC Transfer Instruments 2 2 1 2 2 2 AC DC transfer instruments will be calibrated by comparison with the Laboratory standards which cover the range 0 25 V to 1000 V and 40 Hz to 1 MHz Calibration charges Fee in HK 2 2 2 1 AC DC difference measurement at one 2970 frequency voltage combination 2 2 2 2 Measurement at each additional frequency 630 voltage combination AC Voltage Standards Fixed Output 2 3 1 2 3 2 AC voltage standards with fixed output voltages will be calibrated by AC DC transfer measurements The calibration will also include measurement of output frequency Calibration charges Fee in HK 2 3 2 1 Measurement of voltage and frequency of 2970 an AC voltage standard with single output 2 Measurement of voltage and freguency for 990 each additional output on the same
29. atinum resistance thermometers which are much easier to use and give much higher precision measurements The first International Temperature Scale was adopted in 1927 revised in 1948 as IPTS 48 revised again in 1968 as IPTS 68 and again more recently in 1990 as ITS 90 Officially SCL adopted the ITS 90 from 1 January 1990 The Laboratory realises the ITS 90 by maintaining the following fixed point standards at 1 Triple point of argon 189 3442 C 2 Triple point of mercury 38 8344 C 3 Triple point of water 0 0100 C 4 Melting point of gallium 29 7646 C 5 Freezing point of indium 156 5985 C 6 Freezing point of tin 231 928 C 7 Freezing point of zinc 419 527 C 8 Freezing point of aluminium 660 323 C 9 Freezing point of silver 961 78 C In addition to the above fixed point primary temperature standards the Laboratory possesses standard platinum resistance thermometers and standard type R thermocouples which are calibrated directly in ITS 90 4 2 4 3 Apart from the above fixed points calibration service covers the full range from 80 C to 1100 C and caters for almost all practical thermometers such as liguid in glass thermometers digital thermometers thermocouple or resistance thermometers etc Liquid in glass Thermometers 4 2 1 4 2 2 4 2 3 A thermometer submitted for test is examined for structural defects errors in figuring and dividing tr
30. ation point the indication on the tester will be compared with the value of the applied resistance and the output voltage of the tester will also be measured As test leads that are used with a tester may have leakage resistance it is advisable that the customer submit these leads for test together with the tester Calibration charges Fee in HK 1 14 4 1 Calibration of a single range DC insulation 2150 resistance tester for one output voltage normally not exceeding 5 test points 1 14 4 2 Calibration for each additional range at the 850 same output test voltage 5 test points 1 14 43 Calibration for the same range at a different 850 output test voltage 5 test points 2 LOW FREQUENCY LABORATORY Enquiry Telephone 2829 4855 2 1 Digital Multimeters 2 1 1 The Laboratory offers calibrations for Digital Multimeters DMM s with 5 1 2 digits or higher resolutions 2 1 2 The calibration of DMM s will normally include the tests listed hereunder a DV Voltage 10 mV to 1200 V i Measurement at full range for all ranges ii Linearity check for one range usually the basic range b AC Voltage 10 mV to 1 kV 40 Hz to 1 MHz lt 2 x 10 V Hz Measurement at full range for 3 test frequencies c DC Current 100 uA to 2 A Measurement at full range for all ranges d AC Current 100 uA to 2 A 40 Hz to 10 kHz Measurement at full range for all ranges for 3 test frequencies e DC Resistance 1 mQ to 100 MQ Me
31. ature and the temperature coefficients are determined from results of our resistance measurements made at the reference temperature and at 3 other temperatures over the temperature range of 18 to 25 C using appropriate curve fitting techniques The resistance value at the reference temperature will also be reported Calibration charges Fee in HK 1 2 6 1 Measurement of the resistance of a standard resistor with nominal decade value in range 1 mQ to 100 MQ 1 atone temperature 1910 2 for each additional temperature for 680 resistors suitable for oil immersion 1 2 6 2 Measurement of the resistance of a standard resistor with nominal non decade value in range 1 mQ to 100 MQ 1 atone temperature 1920 2 for each additional temperature for 680 resistors suitable for oil immersion 1 2 6 3 Measurement of temperature coefficients for 4080 an oil immersed standard resistor 1 2 6 4 Measurement of the resistance for all settings 3170 of the first decade of a decade resistance box 1 2 6 5 Measurement of the resistance for all settings 1060 of each additional decade of the same decade resistance box 1 2 6 6 Measurement of the resistance of each 8470 resistor of a resistor build up box Maximum 12 resistors 1 3 1 4 High value Resistors 1 3 1 1 3 2 1 3 3 The Laboratory offers calibration of high value DC resistors and resistance 12 boxes in the range 100 MQ to 1 TOQ 1x 10
32. bout 110 of its capacity The charge for the overloading test is included in the charge for the tension or compression test Bearing Pad Test The bearing pad test and variable voltage test may also be offered upon request from the customer The bearing pad test which applies only to compression force measuring instruments is for assessing the interaction between a force measuring instrument and its support on the force standard machine This test will be performed in accordance with clause B 2 of Annex B of BS EN 10002 3 1995 and is recommended only for new instrument or instrument after repair Variable Voltage Test The variable voltage test is applicable to force measuring instruments requiring electrical supply for operation as mentioned in clause 6 1 3 of BS EN 10002 3 1995 The test is to verify that a variation of 10 of the supply voltage has no significant effect on the force measuring instrument n this test the change in the readings of the force measuring instrument under test will be reported when the supply voltage is varied between 10 of the rated voltage The applied force during this test will be the rated capacity of the force measuring instrument under test 6 2 Calibration charges Fee in HK 6 2 1 For force measuring instruments in measuring range up to 60 kN 6 2 1 1 6 2 1 2 6 2 1 3 6 2 1 4 Tension test including overloading test 4080 Compression test including overloading 4080
33. calibration should have a nominal voltage of 1 V 1 018 V or 10 V Additional uncertainty will be added for other values of emf 1 1 4 Calibration charges Fee in HK 1 1 4 1 Measurement of emf of a saturated standard 2890 cell 1 1 4 2 Measurement of emf of each additional 950 standard cell in the same enclosure 1 1 4 3 Measurement of emf of an electronic 2890 voltage reference standard at one emf 1 1 4 4 Measurement of emf of each additional 950 voltage from the same reference standard of same nominal value 12 Standard Resistors 1 2 1 Standard resistors in the range 1 mQ to 100 MQ can be measured 1 2 2 For oil immersed standard resistors the best measurement uncertainties will be assigned only to 4 terminal decade valued standard resistors of high quality and for measurements being made with the resistors immersed in a constant temperature oil bath at 23 C Measurement at oil temperatures other than 23 C and in the temperature range 18 to 25 C can also be made with additional uncertainties 1 2 3 1 2 4 1 2 5 1 2 6 Resistors not suitable for oil immersion or of values above 1 MQ will normally be measured in air at nominal temperature of 23 C with increased measurement uncertainty Resistors of non decade values are measured with additional uncertainties Calibration of temperature coefficients for oil immersed standard resistors is also available Normally 23 C is taken as the reference temper
34. e dividers rated above 1 kV and with voltage ratios in the range of 10 1to 10 1 Measurements of voltage ratios are generally made at rated voltage of the divider but the maximum test voltage will be limited to 30 kV Measurement uncertainties will depend on the values of the voltage ratios being determined the magnitude of the applied voltage and stability of the dividers under test Typical measurement uncertainty is 60 ppm for dividers of high quality Customers may be required to provide appropriate interfacing devices such as adapters if their equipment cannot be connected directly to the Laboratory test system Calibration charges Fee in HK 1 13 5 1 Measurement of the first voltage ratio at 2850 one applied voltage and one specified polarity 1 13 5 2 Measurement of each additional voltage 970 ratio on the same divider with the same applied voltage as in 1 13 5 1 1 13 5 3 Measurement of each voltage ratio at an 1070 additional test voltage and at one polarity 1 13 5 4 Each repeated measurement with opposite 970 polarity 1 14 Insulation Resistance Testers 1 14 1 1 14 2 1 14 3 1 14 4 The Laboratory offers calibration for DC Insulation Resistance Tester with output test voltage not exceeding 1 kV for resistance range from 1 MQ to 600 GO or 5 kV for resistance range 10 MQ to 600 GQ The tester under test will be calibrated against the high valued standard resistors of the Laboratory At each calibr
35. eters surface texture and roundness of most engineering components and artefacts The measured values will be quoted at 20 C in accordance with international convention 37 5 1 6 Calibration charges 5 1 6 1 5 1 6 2 5 1 6 3 5 1 6 4 5 1 6 5 5 1 6 6 5 1 6 7 5 1 6 8 5 1 6 9 5 1 6 10 5 1 6 11 5 1 6 12 5 1 6 13 5 1 6 14 5 1 6 15 5 1 6 16 5 1 6 17 5 1 6 18 5 1 6 19 5 1 6 20 5 1 6 21 5 1 6 22 5 1 6 23 5 1 6 24 5 1 6 25 5 1 6 26 Description Angle gauge one piece Per additional piece Angle plate box angle plate Bench centre Bench micrometer Bevel protractor Calliper checker up to 300 mm up to 600 mm Check master up to 300 mm up to 600 mm up to 1000 mm Clinometer single face Per additional face Comparator external Cylindrical square Dial gauge dial test indicator Electronic indicating level Engineers steel rule up to 5 intervals Per additional interval Feeler gauge up to 10 blades Per additional blade Gauge block up to 5 pieces Per additional piece Gauge block accessories Height setting micrometer Inclinable table Fee in HK 1500 740 2970 2970 3960 2970 6850 8550 7700 9410 13680 2970 740 2970 2970 2650 2970 2970 250 1600 150 1910 410 5210 7910 4210 5 1 6 27 5 1 6 28 5 1 6 29 5 1 6 30 5 1 6 31 5 1 6 32 5 1 6 33 5 1 6 34 5 1 6
36. full range for all the other ranges 2 5 3 Linearity check for other ranges may be offered upon request at additional charge 2 5 4 For precision AC voltmeters requiring calibration at very high accuracy AC DC transfer technique will be used 2 5 5 Calibration charges Fee in HK 2 5 5 1 Calibration of single range on AC 1560 voltmeter at one frequency 2 5 5 2 Calibration of each additional range at full 170 range on the same AC voltmeter at one frequency 2 5 5 3 Additional linearity check at one frequency 780 per range 2 5 5 4 Calibration at each additional frequency i First range 5 test voltages 780 ii Each additional range at full 170 range 2 6 2 7 Calibration Charges Fee in HK 2 5 5 5 Calibration of precision AC voltmeter at 2470 one frequency voltage combination by AC DC transfer 2 5 5 6 Calibration at each additional frequency 610 voltage combination by AC DC transfer for the same equipment AC Ammeters 2 6 1 2 6 2 2 6 3 2 6 4 The Laboratory offers calibrations for ammeters rated from 100 uA to 20 A up to 20 kHz and from 100 uA to 100 A 45 Hz to 60 Hz using the Laboratory current calibrators The AC ammeter will normally be calibrated at 5 test currents for one range to establish the scale linearity For multi range ammeters additional measurements will be made at full range for all the other ranges Linearity check for other ranges may be offered upon request
37. han 3 ranges Calibration at each additional test point of the same range 1 10 DC Current Calibrators Fee in HK 1700 450 450 1 10 1 DC current calibrators with ranges from 1 uA to 100 A can be calibrated The calibration is usually made at full range setting for each range Calibration at additional test points can be offered at extra charge 1 11 1 12 1 10 2 Calibration charges Fee in HK 1 10 2 1 Measurement at full range setting for a DC 2490 current calibrator with not more than 3 ranges 1 10 2 2 Measurement at full range setting for each 430 additional range of the same calibrator 1 10 2 3 Measurement for each additional current 430 setting of the same range DC High Voltage Supplies 1 11 1 1 11 2 1 11 3 DC High Voltage Supplies rated up to 30 kV can be calibrated The basic calibration will include measurement of output high voltages at appropriate settings or values indicated by an output voltmeter normally not exceeding 5 voltage values The output high voltages will be measured by a Laboratory high voltage divider having a total input resistance of 10 ohms Before submitting their equipment for calibration customers are advised to check whether the output current capability of their supply is sufficient to drive this resistive load They should check also with the Laboratory whether any special adapters will be required Calibration charges Fee in HK 1 11 3 1 Calibratio
38. hantom load The theoretical power measuring range is 37 W to 6 kW and the maximum test voltage and current are respectively 300 V and 20 A 2 8 3 Basic calibration of a wattmeter will include tests at rated voltage and frequency with 5 different current settings on the current range unity power factor For multi range wattmeters additional measurements will be made for all combinations of rated voltage and current ranges 2 8 4 Calibration charges Fee in HK 2 8 4 1 Calibration of a wattmeter at rated voltage 2400 with 5 different current settings on one current range at one frequency and one power factor 2 8 4 2 Additional measurement for o each 450 combination of rated voltage and current ranges for multi range wattmeters same frequency and power factor as in 2 8 4 1 2 8 4 3 Additional service as in 2 8 4 1 but at a 1190 different frequency or power factor 2 8 4 4 Additional service as in 2 8 4 2 but at the 450 same frequency or power factor as for 2 8 4 3 29 2 10 211 Power Factor Meters 2 9 1 29 2 2 9 3 The Laboratory can provide calibration for 50 or 60 Hz single phase power factor meters with measuring range from zero to unity leading or lagging Calibration will be made by applying appropriate sinusoidal voltage and current signals with known phase relationship to the meter under test The ranges of test voltages and currents are 25 V to 250 V and 50 mA to 100 A respectively Calibratio
39. l be reported 4 3 4 32 Calibration charges 4 3 4 1 4 3 4 2 4 3 4 3 4 3 4 4 4 3 4 5 4 3 4 6 4 3 4 7 4 3 4 8 4 3 4 9 4 3 4 10 434 11 43 412 Calibration at one temperature Calibration at each additional temperature Additional charge if any of the above test temperatures exceed 230 C Calibration at triple point of argon Calibration at triple point of mercury Calibration at triple point of water Calibration at melting point of gallium Calibration at freezing point of indium Calibration at freezing point of tin Calibration at freezing point of zinc Calibration of freezing point of aluminium Calibration at freezing point of silver 4 4 Digital Thermometers 4 4 1 4 4 2 4 4 3 Digital thermometers will be calibrated by immersing their sensor probes in constant temperature baths or furnaces and comparing with Laboratory standards If the diameter of the probe exceeds 8 mm or if the probe is bent or of irregular shape or if the length of the probe excluding handle is less than 40 cm there could be difficulty in providing the calibration In such cases please discuss with SCL the feasibility of the calibration Battery operated units must be submitted with batteries which are in good working condition and fully charged It is advisable to submit the battery charger or AC DC adapter as well Fee in HK 2880 690 980 5930 2880 2880 2880 5930 5930
40. ll enquiries regarding calibration services should be addressed to Head Standards and Calibration Laboratory The Government of the Hong Kong Special Administrative Region 36 F Immigration Tower 7 Gloucester Road Wan Chai Hong Kong Telephone 2829 4830 Fax 2824 1302 Website http www itc gov hk scl Email address scl itc gov hk 1 4 1 5 1 6 1 7 1 8 1 9 Calibrations will normally be conducted in the SCL premises SCL reserves the right to accept or decline any application Equipment submitted for calibration should satisfy the following conditions a The equipment must be in clean condition b The equipment must be in good working order c The equipment must bear some unique permanent marking such as a serial number SCL will not normally issue a Certificate of Calibration for equipment without unique identification marking d The equipment must be accompanied by comprehensive operations and service manuals written in English or Chinese e The equipment must be accompanied by any specialised accessories required for its calibration SCL will not normally undertake any maintenance or repair work on the equipment Where the equipment is found to be faulty or to have developed a fault before or during the provision of the calibration service including any loading unloading carriage or transportation of the equipment no calibration service or further calibration service will be provided
41. ministrative Region is to be submitted together with the equipment and manuals Depending on the demand for particular calibration services at the time it may take a short while before an equipment can be accepted for calibration Customers are therefore advised to contact SCL early before their equipment calibration date is due A limited equipment collection and delivery service is available free of charge for small items of equipment but this is subject to the availability of transport Please note the Government s liability in para 1 10 and 1 11 and the conditions of service in the Application for Calibration form On completion of the calibration the customer will be informed regarding the collection return of the equipment Hong Kong Laboratory Accreditation Scheme HOKLAS 4 1 4 2 4 3 4 4 Laboratories approved or seeking approval under HOKLAS are required to have their measurement standards and measuring equipment regularly calibrated by a competent calibration laboratory which offers traceability to internationally recognised primary standards SCL has been designated by HOKLAS as one of the competent organisations which can provide the necessary traceable calibrations HOKLAS has mutual recognition arrangements with a number of overseas laboratory accreditation schemes Updated information is available from HKAS webpage http www itc gov hk hkas To encourage the development of more calibration se
42. n 10 3 2 2 The frequency range covers 1 Hz to 18 GHZ 3 2 3 The calibration of a frequency time interval or period counter will basically include time base calibration and frequency time interval or period measurement accuracy check at 6 different test points Calibration at additional test points can be arranged on demand 3 24 Calibration charges Fee in HK 3 2 4 1 Calibration of frequency time base 3490 standard 3 2 4 2 Calibration of time scale standard 3490 3 2 4 3 Calibration of frequency time 2460 interval period counter 3 2 4 4 Additional measurement of frequency time 110 interval period per test point 3245 Calibration of frequency relation of a pair 1360 of input output ports 3 3 RF Power Meters 3 3 1 The Laboratory can provide calibrations for RF power meters in the range 0 1 pW to 100 mW for frequency range from 100 Hz to 18 GHz 25 3 3 2 The calibration of a power meter normally includes 3 4 a Measurement at one frequency for selected levels normally at 20 dB step and b Measurement at one power level normally 10 mW for a specified number of different frequencies The number of frequencies tested will determine the calibration fee 3 3 3 Calibration charges 3 3 3 1 Calibration of RF power meter i 6 test frequencies ii 12 test frequencies G 18 test frequencies 3 3 3 2 Calibration at each additional frequency power level combination RF Millivoltmeter 3 4 1 3 4
43. n charges Fee in HK 2 9 3 1 Calibration of power factor measuring 2470 function for one combination of frequency voltage and current 2 9 3 2 Calibration of power factor measuring 990 function for each additional combination of frequency voltage and current Phasemeters 2 10 1 2 10 2 2 10 3 2 10 4 The Laboratory offers calibration for phasemeters in frequency range 1 Hz to 100 kHz The phasemeters will be calibrated by applying two digitally synthesised low distortion sine waves generated by the Laboratory s phase angle standard Signal levels range from 100 mV to 100 V rms The basic calibration for a phasemeter include checking of phase angle measurement accuracy at equal signal levels for 4 different frequencies Calibration charges Fee in HK 2 10 4 1 Basic calibration for a phasemeter 2970 2 10 4 2 Each additional test point 100 Withstanding Voltage Testers 2 11 1 The Laboratory offers calibration for withstanding voltage testers with sinusoidal output voltages 50 Hz not exceeding 11 kV rms value The calibration will normally include measurement of output voltages and test for leak current detection accuracy Customers may be required to provide appropriate loading resistors for the leak current test 2 12 20 2 11 2 For calibration of testers having additional functions or higher output 2 11 3 voltages or more than the number of ranges specified in section 2 11 3 below the
44. n of a single range DC High 3780 Voltage Supply 1 11 3 2 Calibration for each additional range 5 1920 voltage values DC High voltage Voltmeter 1 12 1 1 12 2 1 12 3 1 12 4 DC voltmeters with measuring ranges from 1 kV to 30 kV will be calibrated by comparing their readings with the known values of applied high voltages Low voltage voltmeters and detachable high voltage probes for range extension may be calibrated together as a single high voltage voltmeter Customers may be required to provide appropriate adapters if their equipment cannot be connected directly to the Laboratory s measurement system For single range voltmeters calibration will be made at cardinal points maximum 5 points 1 12 5 1 12 6 For multi range voltmeters the basic calibration will include measurements at full range for each range and linearity check on one basic range Linearity check on additional ranges may be offered at extra cost Calibration charges Fee in HK 1 12 6 1 Calibration of a single range high voltage 3800 voltmeter 1 12 6 2 Calibration of a multi range high voltage 5020 voltmeter with not more than 4 ranges 1 12 6 3 Measurement at full range for each 430 additional range 1 12 6 4 Each additional linearity check maximum 970 5 voltage values 1 13 DC Resistive High voltage Dividers 1 13 1 1 13 2 1 13 3 1 13 4 1 13 5 The Laboratory offers calibrations for DC resistive high voltag
45. nal AM FM modulation 740 accuracy check on the same unit maximum carrier frequency limited to1 3 GHz 3 6 Spectrum Analysers 3 6 1 The calibration of a spectrum analyser normally includes checks on frequency accuracy level flatness level linearity input attenuation and calibration reference output 3 7 3 8 27 3 6 2 Calibration charges Fee in HK Calibration of a spectrum analyser with frequency range extending to i 500 MHz 6100 ii 2 GHz 7350 G 8 GHz 8620 iv 12 GHz 9780 v 18 GHz 10990 Modulation Meters 3 7 1 The Laboratory has measurement capability for frequency and amplitude modulations for carrier frequencies in the range 150 kHz to 1 3 GHz 3 7 2 Calibration charges Fee in HK Calibration of modulation See table below Modulation No of test points Frequency Amplitude 4 1440 990 Each additional point 130 110 Oscilloscopes 3 8 1 3 8 2 3 8 3 The Laboratory can provide calibrations for oscilloscopes with time base accuracy of better than 1 2 and or vertical deflection accuracy of better than 3 2 up to 2 input channels for bandwidth up to 1 GHz real time For plug in type oscilloscopes the combined unit of mainframe and plug in units will be calibrated as a composite unit The calibration of an oscilloscope normally includes a Tests on horizontal sweep b Tests on vertical deflection c Measurement of upper 3dB bandwidth 28
46. olume can be determined with knowledge of water density and corrections for air buoyancy and thermal expansion of the vessel The volumetric method requires a standard calibrated volumetric measure The volume of the test volumetric vessel is determined from the number of dumps of the standard measure required to fill the test measure Normally gravimetric method will be used for volumetric determination at the capacity of 20 L or below whilst volumetric method will be used for measurements above 20 L 5 3 3 The submitted vessels should be in a clean condition 5 3 4 Calibration charges Fee in HK 5 3 4 1 Standard measure at the capacity of 20 L or 1970 below per graduation 5 3 4 2 Per additional graduation 980 5 3 4 3 Standard measure of capacity above 20 L Upon Request 5 3 4 4 Soap film burette per interval 3960 5 3 4 5 Per additional interval 980 5 4 Hardness Enquiry Telephone 2829 4835 5 4 1 The hardness of a material is in broad terms a measure of its resistance to local deformation by some specified disturbing force Unlike most physical and engineering properties therefore hardness is not a unique property but depends on the nature of the test concerned 54 2 5 4 3 5 4 4 5 4 5 5 4 6 43 The measured hardness value is the result of a test performed under standard conditions and is based on a convention The process of hardness measurement generally comprises three steps i a test
47. ontainer or containers During calibration test weights are compared with appropriate standards As weights of higher class require use of standards of higher accuracy and more elaborate calibration procedures calibration charge will be higher The customers are therefore urged to apply for calibration accuracy appropriate to their usages see following paragraph for reference and specifications of their weights For example owing to their brittle property and inferior resistance to wear and corrosion cast iron weights will only be used as weights of class M and lower For calibration of weighing machines normally the uncertainties of the weights used will be less than the resolution of the machine to be calibrated The following table serves as a general guideline Recommended lowest class of weights required for calibration of weighing machines Resolution of weighing machine 100 g 10g lg 100mg 10mg Img O lmg 0 01 mg or less Capacity Up to 200 g M Mi Fo F E2 200 g to 1 kg M M F2 F E2 E2 E2 1 kg to 30 kg M2 M2 M F2 E2 E2 E2 30 kg to 100 kg M2 M F gt F E Above 100 kg M2 M F2 F E2 5 2 6 The measured value for the test weight will be the mass of a hypothetical 5 2 7 5 2 8 weight of density 8 000 kg m which at 20 C and in air of density 1 2 kg m would balance the test weight The basis is taken by convention and accords with OIML No 33 The calibration uncertainty quoted will normall
48. raphs temperature and humidity recorders can usually record continuously the temperature and humidity readings on a chart For a thermohygrograph the sensor and the recording mechanism are usually housed in the same cabinet Other designs of temperature and humidity recorder usually employ the combination of an electronic temperature humidity sensor meter and an electrical chart recorder 7 5 2 The thermohygrographs temperature and humidity recorders will be calibrated by comparing against the Laboratory standards in the calibration chamber of a humidity generator 7 5 3 o Calibration charges Fee in HK 7 5 3 1 Calibration at one humidity temperature 1980 combination 7 5 3 2 Calibration at each additional humidity 730 temperature combination
49. requency 21 Calibration charges Fee in HK 2 12 3 5 Measurement of the capacitance for all 990 settings of each additional decade of the same decade capacitance box at one frequency 2 13 Standard Inductors 2 13 1 2 132 2 13 3 2 13 4 The Laboratory offers calibration of standard inductors in the range from 100 uH to 1 H Measurements are normally made at a nominal ambient temperature of 23 C and unless otherwise specified the test frequency will be 1 kHz Tests at 400 Hz and 10 kHz can be offered upon request The inductor will be calibrated as a 2 terminal device and the series equivalent inductance of the device will be reported Calibration charges Fee in HK 2 13 4 1 Measurement of the self inductance of a 1970 standard inductor at one frequency 2 13 4 2 Measurement of the self inductance at 990 each additional frequency for the same inductor 2 14 LCR Meters 2 14 1 2 14 2 There are many methods for measuring impedance and commercial LCR meters may have very different working principles It is more advisable that customers submit their impedance standards for calibration which in turn can be used to perform in house checking of their LCR meters However the Laboratory may offer performance checks for LCR meters using impedance standards The tests will normally be made at 1 kHz and will be restricted to decade values in the following ranges Resistance 1 Q to 10 KQO 2 or 4
50. rs Recorders 4 6 1 4 6 2 Temperature loggers recorders with multiple input channels will generally be calibrated as follows i Calibration at specified temperatures on one channel ii Verification of all input channels at one test temperature or equivalent emf Calibration charges Fee in HK 4 6 2 1 Calibration at one temperature on one 2240 channel 4 6 2 2 Calibration at each additional temperature 540 on the same channel 4 6 2 3 Verification of up to 20 input channels at 530 one temperature Additional charges are applicable for units with more than 20 input channels 4 6 2 4 Additional charge if any of the above 980 temperatures exceed 230 C 4 6 2 5 Calibration for an additional probe for each 200 temperature temperature same as per 4 6 2 1 and 4 6 2 2 4 7 Bimetal Dial Thermometers 4 7 1 4 71 2 Bimetal dial thermometers will be calibrated by comparison with Laboratory standards in constant temperature baths or furnaces Calibration charges Fee in HK 4 7 2 1 Calibration at one temperature 2090 4 1 2 2 Calibration at each additional temperature 520 4 7 2 3 Additional charge if any of the above test 980 temperatures exceed 230 C 35 4 8 Beckmann Thermometers 4 8 1 Beckmann thermometers are designed to measure small temperature differences Hence the calibration of a Beckmann thermometer refers to comparing the true temperature differences obtained from the Laboratory
51. rvices in Hong Kong SCL will discontinue any calibration service whenever equivalent HOKLAS accredited services become readily available from other local laboratories Calibration Services Available 5 1 5 2 5 3 A list of the calibration services and the current fees are found in the pages following The fees are subject to change from time to time without prior notice As it is impractical to list definitively all calibrations for which the SCL has measurement capability prospective customers with a requirement for calibrations which are not listed are welcome to contact SCL As SCL does not have a shipping section it will be necessary for the overseas customer to arrange for the delivery of equipment to SCL and for collection after calibration It is recommended that the customer appoints a transportation agent who can make all the necessary arrangements for customs clearance insurance packing and transportation SCOPE OF CALIBRATION SERVICES 1 DIRECT CURRENT LABORATORY Enquiry Telephone 2829 4832 1 1 Standard Cells and Electronic Voltage References 1 1 1 The value of electromotive force of a saturated standard cell can be measured with best measurement uncertainty only if the cell is of high quality and is contained in a temperature regulated enclosure 1 1 2 Cells without temperature control will be calibrated at a nominal ambient temperature of 23 C 1 1 3 Electronic voltage reference standards submitted for
52. terminal Capacitance 10 pF to 1 uF 2 or 3 terminal Inductance 100 uH to 1 H 2 terminal 2 15 2 16 2 14 3 2 14 4 22 Customers may be required to submit compatible test fixture and or test leads for the tests Calibration charges Fee in HK 2 14 4 1 Performance checks on a LCR Meter at 1 4200 kHz Inductive Voltage Dividers 2 15 1 2 15 2 2 15 3 2 15 4 Inductive voltage dividers IVD s will be calibrated by comparison with the Laboratory s 8 dial IVD normally at specific frequencies of 400 Hz 1 kHz and 10 kHz with an input test voltage of 25 V The calibration normally involve measurement of voltage ratio magnitude of the output voltage related to the input voltage of the IVD The basic calibration for a single decade IVD will include measurement of voltage ratio for all output settings of the IVD at one test frequency The basic calibration for a multi decade IVD will include measurement of voltage ratio at one frequency for all separate settings of the first and second dials of the IVD Additionally measurement will be made with all dials in use to realise the ratios which are multiples of 1 11 to cover the performance of all dials Calibration charges Fee in HK 2 15 4 1 Calibration of a single decade IVD at one 2970 frequency 2 15 4 2 Calibration of a multi decade IVD at one 5940 frequency 2 15 4 3 Calibration at each additional test point 240 AC High voltage Voltmeter Enquir
53. y Telephone 2829 4832 2 16 1 2 16 2 2 16 3 2 16 4 High voltage voltmeters with measuring ranges from 1 kV to 11 kV 50 Hz can be calibrated A low voltage voltmeter associated with detachable high voltage probe for range extension may be calibrated together as a single high voltage voltmeter For single range voltmeters calibration will be made at cardinal points normally not exceeding 5 points For multi range voltmeters the basic calibration will include measurements 23 at full range for each range and linearity check on one range 2 16 5 Calibration charges Fee in HK 2 16 5 1 Calibration of a single range AC high 3800 voltage voltmeter 2 16 5 2 Calibration of a multi range AC high 4210 voltage voltmeter with not more than 2 ranges 2 16 5 3 Measurement at full range for each 430 additional range of a multi range high voltage voltmeter 24 3 RADIO FREQUENCY LABORATORY Enquiry Telephone 2829 4850 3 1 General The RF Laboratory can provide calibrations for RF time and frequency equipment up to 18 GHz In general measurements are available to equipment fitted with coaxial connectors and 50 Q nominal characteristic impedance Limited calibration service can also be offered for equipment with 75 Q nominal characteristic impedance 3 2 Time and Frequency 3 2 1 The Laboratory offers calibration service for frequency standards and frequency counters with specified accuracy of better than 1 part i
54. y relate to the class of the submitted weight such that the uncertainties for class Ep weights and weights of class F or lower will be about 1 3 and 1 5 of the prescribed permissible maximum errors respectively Calibration charges Fee in HK 5 2 8 1 Oo Class E2 standard weight per piece 1680 5 2 8 2 o Class F standard weight per piece 660 5 2 8 3 Class Fy or below standard weight per 430 piece 5 2 8 4 Minimum charge per issue of 1020 certificate report 42 5 3 Volume Enquiry Telephone 2829 4835 5 3 1 53 2 The Laboratory determines the contained volume capacity or the delivered volume of a vessel The contained volume is the volume of water required to fill the vessel at 20 C whilst the delivered volume is the volume of water which may be poured from the vessel at 20 C under specified conditions e g with a fixed drainage time of 30 seconds after cessation of main flow The delivered volume is always less than the contained volume due to the film of liquid left on the walls of the vessel after delivery The difference between the contained and delivered volume for glassware may be of the order of 0 1 of the capacity for a 1 L flask increasing to 0 25 for a 50 mL flask when using water There are two methods employed by this Laboratory for volumetric determination The gravimetric method determines the mass of water either contained or delivered from a test measure From the measured mass the v
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