CERTIFICATE OF CALIBRATION
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1 Page 1 of 5 CERTIFICATE OF CALIBRATION 1K Thermistor CERTIFICATE NO.: MANUFACTURER: Measurement Specialties DATE OF CALIBRATION: 26-Apr-17 TC15249 CUSTOMER: AMBIENT TEMPERATURE: (21 ± 3) C JOB NUMBER: RELATIVE HUMIDITY: (55 ± 1) % Relative Humidity CALIBRATION POINTS ( C): Method of Calibration The thermistor has been calibrated in accordance with M&V's technical procedures TP (V), TP (V), TP (V), TP (R1), TP (V) under well monitored environmental conditions (at 8 Boon Lay Way, #9-2). The thermistor was calibrated at Triple Point of Water (.1 C), Gallium Melting Point ( C) and Calibration Bath maintained at 15 C. The temperature scale used is ITS-9. The fixed point cells from ITS-9 used for the calibration are water triple point cell and gallium melting point cell. The water bath temperature was measured by SPRT and superthermometer as reference. Prior to calibration, an SPRT was used to check on the stability of the calibration equipment for measurement assurance. Upon completion of the calibration with a, b, and c constants computed for the thermistor, the thermistor then goes through a verification test where it is measured again at triple point of water and in water bath at 21 C. The measured temperatures should show a deviation of < 13mk. Standard Used Equipment Triple Point of Water Cell (ITS-9) Gallium Cell (ITS-9) SPRT SPRT Super-Thermometer Data Acquisition Unit Serial Number C-G219 Ga B2A15 MY The reference standards used in this calibration are traceable to the SI units of measurement realised at National Metrology Centre, Singapore or other recognised national standards laboratories. The results reported herein have been performed in accordance with the terms of accreditation under the Singapore Accreditation Council. Calibrated By: Approved by: Serene Cheong Calibration Officer Thant Zaw Approving Officer Head of Laboratory Note: Copyright of this certificate is owned by the Measurement & Verification Pte Ltd (M&V) and shall not be reproduced other than in full except with the prior written approval of M&V.
2 1:18:22 1:2:2 1:21:42 1:23:22 1:25:2 1:26:42 1:28:22 1:3:2 1:31:42 1:33:22 1:35:2 1:36:42 1:38:22 1:4:2 1:41:42 1:43:22 1:45:2 1:46:42 1:48:22 1:5:2 1:51:42 1:53:22 1:55:2 1:56:42 1:58:22 11::2 11:1:42 11:3:22 11:5:2 11:6:42 11:8:22 11:1:2 11:11:42 11:13:22 11:15:2 11:16:42 11:18:22 11:24:3 11:25:43 11:27:23 11:29:3 11:3:43 11:32:23 11:34:3 11:35:43 11:37:23 11:39:3 11:4:43 11:42:23 11:44:3 11:45:43 11:47:23 11:49:3 11:5:43 11:52:23 11:54:3 11:55:43 11:57:23 11:59:3 12::43 12:2:23 12:4:3 12:5:43 12:7:23 12:9:3 12:1:43 12:12:23 12:14:3 12:15:43 12:17:23 12:19:3 12:2:43 12:22:23 12:24:3 1:2:17 1:21:57 1:23:37 1:25:17 1:26:57 1:28:37 1:3:17 1:31:57 1:33:37 1:35:17 1:36:57 1:38:37 1:4:17 1:41:57 1:43:37 1:45:17 1:46:57 1:48:37 1:5:17 1:51:57 1:53:37 1:55:17 1:56:57 1:58:37 11::17 11:1:57 11:3:37 11:5:17 11:6:57 11:8:37 11:1:17 11:11:57 11:13:37 11:15:17 11:16:57 11:18:37 11:2:17 Page 2 of 5 1K Thermistor CERTIFICATE NO.: TC // Stability of Calibration Equipment Before the calibrations are carried out, an SPRT is used to ensure that all calibration equipments are in stable conditions. Stability Check at Triple Point of Water Triple Point of Water (SPRT 4321 in C-G219 on 21 Apr 217) Stability Check at 15 C Calibration Water Bath C Water Bath (SPRT 4321 in Bath on 25 Apr 217) Stability Check at Gallium Melting Point Gallium Melting Point (SPRT 434 in Ga on 25 Apr 217)
3 Page 3 of 5 1K Thermistor CERTIFICATE NO.: TC // Measurement Uncertainty The reported expanded uncertainty is.13 C, a coverage factor of k=2 for a level of confidence interval of approximately 95%. The measurement results are as follows: Temperature ( C) Resistance (Ω) 32, , ,14.82 Equation Used 1/T = a + b (Ln R) + c (Ln R) 3 Where: T a, b, c Ln R = Kelvin units ( C ) = coefficients derived from measurement = natural logarithm of resistance in ohms Coefficients Derived From Measurement a = b = c = E E E-8 Temperature - Resistance Table Temp ( C) R Value (Ω) Temp ( C) 32, , , , , , , , , , , , , , , , R Value (Ω) 15, , , , , , , , , , , , , , ,59.527
4 16:45: 16:46: 16:47: 16:48: 16:49: 16:5: 16:51: 16:52: 16:53: 16:54: 16:55: 16:56: 16:57: 16:58: 16:59: 17:: 17:1: 17:2: 17:3: 17:4: 17:5: 17:6: 17:7: 17:8: 17:9: 17:1: 17:11: 17:12: 17:13: 17:14: Page 4 of 5 1K Thermistor CERTIFICATE NO.: TC // Verification Test (VT) The computed a, b, c constants forms the characteristic of this thermistor. The constants are used for verification test on the thermistor using a ITS-9 fixed point cell (TPW Cell) and at 21 C. The verification test should show deviation less than 13mk. Verification at Triple Point of Water TPW TPW Date Temp Date Temp 25/4/17 16:45: /4/17 17:: /4/17 16:46:.17 25/4/17 17:1: /4/17 16:47: /4/17 17:2: /4/17 16:48:.13 25/4/17 17:3: /4/17 16:49: /4/17 17:4:.16 25/4/17 16:5: /4/17 17:5: /4/17 16:51:.15 25/4/17 17:6:.99 25/4/17 16:52: /4/17 17:7:.13 25/4/17 16:53: /4/17 17:8: /4/17 16:54: /4/17 17:9: /4/17 16:55: /4/17 17:1: /4/17 16:56: /4/17 17:11: /4/17 16:57: /4/17 17:12: /4/17 16:58:.17 25/4/17 17:13: /4/17 16:59:.95 25/4/17 17:14:.12 Average.14 Verification at Triple Point of Water mk
5 17:19: 17:2: 17:21: 17:22: 17:23: 17:24: 17:25: 17:26: 17:27: 17:28: 17:29: 17:3: 17:31: 17:32: 17:33: 17:34: 17:35: 17:36: 17:37: 17:38: 17:39: 17:4: 17:41: 17:42: 17:43: 17:44: 17:45: 17:46: 17:47: 17:48: Page 5 of 5 1K Thermistor CERTIFICATE NO.: TC // Verification at 21 C in Calibration Water Bath 21 C 21 C Date Temp Date Temp 25/4/17 17:19: /4/17 17:34: /4/17 17:2: /4/17 17:35: /4/17 17:21: /4/17 17:36: /4/17 17:22: /4/17 17:37: /4/17 17:23: /4/17 17:38: /4/17 17:24: /4/17 17:39: /4/17 17:25: /4/17 17:4: /4/17 17:26: /4/17 17:41: /4/17 17:27: /4/17 17:42: /4/17 17:28: /4/17 17:43: /4/17 17:29: /4/17 17:44: /4/17 17:3: /4/17 17:45: /4/17 17:31: /4/17 17:46: /4/17 17:32: /4/17 17:47: /4/17 17:33: /4/17 17:48: Average SPRT Reference Temperature in 21 C Calibration Bath SPRT 21 C SPRT 21 C Date Temp Date Temp 25/4/17 17:19: /4/17 17:34: /4/17 17:2: /4/17 17:35: /4/17 17:21: /4/17 17:36: /4/17 17:22: /4/17 17:37: /4/17 17:23: /4/17 17:38: /4/17 17:24: /4/17 17:39: /4/17 17:25: /4/17 17:4: /4/17 17:26: /4/17 17:41: /4/17 17:27: /4/17 17:42: /4/17 17:28: /4/17 17:43: /4/17 17:29: /4/17 17:44: /4/17 17:3: /4/17 17:45: /4/17 17:31: /4/17 17:46: /4/17 17:32: /4/17 17:47: /4/17 17:33: /4/17 17:48: ΔT ( C) Average mk Verification at 21 C 21 C SPRT 434
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