RP-16, Verification of Laboratory Environments Presented by: Doug Cooper TAC

Topics  Overview of RP-16  Temperature Testing in RP-16  RP-16 Applied to a Project

Six Phases of a Project 1. Enthusiasm 2. Disillusionment 3. Panic 4. Search for the guilty 5. Punishment of the innocent 6. Praise & Honors for the nonparticipants

Six Phases of a Project 1. Enthusiasm 2. Disillusionment 3. Panic 4. Search for the guilty 5. Punishment of the innocent 6. Praise & Honors for the nonparticipants

Six Phases of a Project 1. Enthusiasm 2. Disillusionment 3. Panic 4. Search for the guilty 5. Punishment of the innocent 6. Praise & Honors for the nonparticipants

Six Phases of a Project 1. Enthusiasm 2. Disillusionment 3. Panic 4. Search for the guilty 5. Punishment of the innocent 6. Praise & Honors for the nonparticipants

Six Phases of a Project 1. Enthusiasm 2. Disillusionment 3. Panic 4. Search for the guilty 5. Punishment of the innocent 6. Praise & Honors for the nonparticipants

Six Phases of a Project 1. Enthusiasm 2. Disillusionment 3. Panic 4. Search for the guilty 5. Punishment of the innocent 6. Praise & Honors for the nonparticipants

Six Phases of a Project 1. Enthusiasm 2. Disillusionment 3. Panic 4. Search for the guilty 5. Punishment of the innocent 6. Praise & Honors for the nonparticipants

Message Design for Success  Start with the Finish  Finish with the Finish  Continue with the Finish

Overview of RP-16  Temperature Testing  Humidity Testing  Static Air Pressure Testing  Particulate Testing  Sound Intensity Level Testing  Lighting Level Testing  ESD Testing  Measuring the Shielding Effectiveness of Shielded Enclosures  Site Vibration Measurements

Common Test Topics  Definitions and Nomenclature  Independent Test Systems  Traceability & Uncertainty of Test Equipment  Test Methodology  Sample Test Report

What RP-16 Does not do  Specify a Test Method for Each Design Parameter  Specify Test Sensor Quantities  Specify Test Durations or Sampling Rates  Specify Test Instruments  Specify Report Data or Format

What RP-16 Does  Establishes common definitions and nomenclature  Provides information to assist the tester and owner in establishing a test protocol and acceptance criteria appropriate for the mission of the lab  Assists with test instrumentation selection including accuracy, uncertainty  Recommends a written test protocol

Temperature Testing  Acceptance Criteria  Test Locations  Test Timing  Independent Test System  Methodology  Sample Reports

Acceptance Criteria  Temperature specifications have historically been problematic due to a lack of general agreement of the precise meaning of terms and how they define acceptance criteria. RP-16 defines temperature for test acceptance as follows:  Temperature Stability Mean Stability Absolute Stability  Rate of change Number of fluctuations crossing a mean over time  Gradients Change in temperature over distance

Test Locations  Room Volume Volume usually defined in distance from walls, ceiling and floor  Workstation Volume Volume of space including instruments and UUT  Instrument Volume Space occupied by a piece of fixed instrumentation alone  Part Volume Measuring volume of an instrument

Test Timing  Data sampling interval Rate that data is sampled; once/minute,once/6 minutes  Test Duration Usually 8,24 or 72 hours. Longer tests cost more.

Independent Testing System  Independent data logger with connected test sensor array not associated with the lab control system  Testing system should be calibrated as a unit with test sensors connected to data logger  Calibration should be traceable to a National Laboratory or to ITS-90  Total expanded uncertainty of the independent test system should be computed according to NIST Technical Note 1297 current addition

Methodology  Ambient Conditions Lab operating in normal condition without people. A heat load can be simulated to reflect occupancy.  Test Sensor Quantity and Locations The number of sensors should be based on the lab size and functionality of the lab. Sensor locations should be based on functionality of the lab. When testing room volume the volume is usually defined as 24” AFF, 18” below ceiling and 12” from wall.

Methodology continued  Lab Recovery Test The lab recovery test is conducted to demonstrate the time a lab recovers during out of tolerance conditions The lab temperature is manually controlled one or two degrees above and below set point. The control system is enabled to automatic for each test. The test system logs the time required to return to specification for each test

Design for Success  Temperature Specification Set Point - 20° C Stability - ± 0.01° C per hour - ± 0.1° C per 12 hours - ± 0.1° C per 24 hours  Gradients.1° C/meter vertical and horizontal

Sensor 2 Sensor S °C 20.0°C 20.01°C The lower graph shows a stability failure. Is the top graph a stability failure? Temperature Definition

Methodology  Test lab volume  Test unoccupied with lights off  Test for 24 hours at 1 minute intervals  Artificial instrument load to simulate 1kW  Independent test system consists of Instrulab model??? data logger connected with 12 YSI model??? test sensors  Test apparatus expanded uncertainty ° C.

Methodology – Sensor Locations

Analysis – X Axis Gradients

Analysis – Y Axis Gradients

Analysis – X Y Axis Gradients

Analysis – Vertical Gradients

Acceptance Criteria  Gradient Acceptance The difference in value of the mean value of each pair of sensors compared must be equal to or less than 0.1° C. in a 24 hour period.  Stability Acceptance Mean sensor value must be equal to or less than 0.01° C. per hour and equal to or less than 0.1° C. in a 24 hour period.

Conclusion RP-16 was conceived to provide the metrology community guidance for testing laboratories. It can be used as effective tool for “Design for Success”.

Questions?