PAO Accredited Laboratories (as of Dec. 2012) - DTI

Products/
Class of Test
Measured
quantities/
instrument
Range to be
calibrated
262 of 391
Best
measurement
capability
expressed as an
uncertainty ()*
Standard Method/
Reference
Standard
.04 A.C. ammeters AC Ammeter 0 to 400 µA 0.09 µA
(from 50 Hz to 1
kHz)
0 to 4000 µA 0.9 µA
0 to 40 mA 0.020 mA
0 to 400 mA 0.14 mA
0 to 4000 m A 1.5 mA
0 to 10 A 0.006 A
.09 Ohmmeters Ohmmeter 0 to 400 Ω 0.06 Ω
0 to 40 kΩ 0.006 kΩ
0 to 4 MΩ 0.000 7 MΩ
0 to 40 MΩ 0.043 MΩ
.17 Other
Digital Multimeter
EA-10/15: EA
instruments up to 4 ½ digits
only
Guidelines
@ DC voltage 0 to 400 mV 0.06 mV on the Calibration
0 to 4 V 0.000 6 V of Digital
0 to 40 V 0.006 V Multimeters
0 to 400 V 0.06 V
0 to 1000 V 0.6 V
@ AC voltage 0 to 400 mV 0.06 mV
(from 50 Hz to 1
kHz)
0 to 4 V 0.000 6 V
0 to 40 V 0.006 V
0 to 400 V 0.06 V
0 to 1000 V 0.6 V
@ DC current 0 to 400 µA 0.08 µA
0 to 4000 µA 0.9 µA
0 to 40 mA 0.006 mA
0 to 400 mA 0.06 mA
0 to 4000 m A 0.6 mA
0 to 10 A 0.006 A
@ AC current 0 to 400 µA 0.09 µA
(from 50 Hz to 1
kHz)
0 to 4000 µA 0.9 µA
0 to 40 mA 0.020 mA
0 to 400 mA 0.14 mA
0 to 4000 m A 1.5 mA
0 to 10 A 0.006 A
@ Resistance 0 to 400 Ω 0.06 Ω
0 to 40 kΩ 0.006 kΩ
0 to 4 MΩ 0.000 7 MΩ
0 to 40 MΩ 0.043 MΩ
5.45 Calibration of ancillary temperature measuring instruments
.05 Transmitters Temperature - 20 to 200 °C Input 0.2 °C ISA Textbook:
Transmitters
Output 0.006 mA Calibration –
A Technician’s
Guide.
by Mike Cable
* A reported uncertainty will be that for the instrument itself during calibration plus the appropriate
measurement capability of the laboratory. The uncertainties are based on an estimated confidence
probability of approximately 95% unless otherwise stated.
Legends to Reference Standards:
ASME - American Society of Mechanical Engineers
ASTM - American Society for Testing and Materials
BS - British Standard