Professional calibration helps confirm whether measuring instruments are providing accurate and reliable results. However, proper preparation before sending equipment to a calibration laboratory—or before technicians arrive for on-site calibration—can make the process faster, safer, and more effective.

Poorly prepared instruments may cause delays, additional costs, incomplete calibration, or even damage during transportation. Missing accessories, unclear calibration requirements, contaminated equipment, and incorrect instrument details can also prevent a calibration provider from completing the work correctly.

By following a structured preparation process, Australian businesses can reduce downtime, support accurate results, and ensure their instruments return ready for use.

Why Is Instrument Preparation Important Before Calibration?

Calibration involves comparing an instrument’s measurements with an appropriate reference standard under controlled conditions.

Before this comparison can occur, the calibration provider needs to confirm that the instrument is safe, functional, correctly identified, and suitable for testing.

Preparing equipment properly can help:

• Prevent avoidable calibration delays
• Reduce the risk of transport damage
• Ensure the correct calibration points are tested
• Identify faults before calibration begins
• Protect calibration technicians
• Improve instrument traceability
• Avoid missing accessories or components
• Support accurate calibration documentation
• Reduce operational downtime
• Simplify the return-to-service process

Instrument preparation should therefore be included in every organisation’s calibration-management procedure.

1. Identify Every Instrument Clearly

Every instrument should have a unique identification number or asset code.

This identification allows the business and calibration provider to connect the physical instrument with its service request, calibration certificate, maintenance history, and equipment register.

Before calibration, record the following information:

• Equipment identification number
• Instrument description
• Manufacturer
• Model number
• Serial number
• Department or location
• Measurement range
• Required accuracy or tolerance
• Current calibration due date
• Responsible staff member
• Previous certificate number, if available

Check that the serial number and asset label are readable and match the information in your equipment register.

If the identification label is damaged or missing, replace it before sending the instrument whenever possible.

2. Review the Instrument’s Calibration History

Previous calibration records can provide valuable information about an instrument’s performance.

Review earlier certificates to determine whether the instrument:

• Passed its previous calibration
• Required adjustment
• Showed significant measurement drift
• Produced an out-of-tolerance result
• Has a history of repair
• Requires specific calibration points
• Needs a shorter calibration interval
• Has recurring accuracy problems

If an instrument has previously failed calibration, inform the calibration provider. This information may help technicians investigate its performance more effectively.

Historical results can also help your business determine whether the existing calibration frequency remains suitable.

3. Confirm Your Calibration Requirements

Do not assume that every calibration service includes the same tests.

The calibration provider should understand how the instrument is used and what level of testing your business requires.

Before booking the service, confirm:

• Required measurement range
• Calibration points
• Accuracy or tolerance requirements
• Applicable procedures or standards
• Whether adjustment is authorised
• Whether before-and-after adjustment results are required
• Required measurement traceability
• Whether a traceable or accredited calibration is needed
• Certificate and reporting requirements
• Required turnaround time
• Whether laboratory or on-site calibration is preferred

For example, an instrument with a wide operating range may require calibration at several points rather than at only one standard value.

Clear instructions help ensure that the calibration results are relevant to the instrument’s actual application.

4. Inspect the Instrument for Physical Damage

Complete a visual inspection before sending the instrument for calibration.

Look for:

• Cracked displays
• Damaged buttons
• Loose components
• Broken connectors
• Bent terminals
• Damaged probes
• Frayed cables
• Missing covers
• Corrosion
• Fluid leakage
• Impact damage
• Worn seals
• Unusual noises
• Burn marks
• Damaged threads or fittings

Calibration verifies measurement performance; it does not automatically repair a damaged instrument.

If a fault is identified, contact the calibration provider to determine whether repair or inspection should be completed before calibration.

Sending severely damaged equipment without notification may cause delays and create safety risks.

5. Check That the Instrument Is Operational

Where safe and appropriate, perform a basic functional check before calibration.

Confirm that:

• The instrument powers on
• The display operates correctly
• Buttons and controls respond
• Batteries are sufficiently charged
• Readings appear on the display
• Cables and probes connect correctly
• Communication ports function
• Alarms or indicators operate
• Required software can communicate with the device

A non-functional instrument usually cannot be calibrated until the underlying fault has been investigated.

Record any unusual behaviour and provide these details to the calibration technician.

6. Clean and Decontaminate the Equipment

Instruments should be clean and safe to handle before being submitted for calibration.

Remove accessible dirt, dust, grease, oil, residue, labels, and other contaminants using a cleaning method suitable for the instrument.

Equipment used in healthcare, laboratories, food production, chemicals, wastewater, manufacturing, or hazardous environments may require formal decontamination.

Where applicable:

• Follow the manufacturer’s cleaning instructions
• Use approved cleaning materials
• Avoid liquids that may enter electronic components
• Remove process residue from fittings and connections
• Complete a decontamination certificate
• Declare any exposure to hazardous substances
• Inform the calibration provider about biological or chemical risks

Never send contaminated equipment without notifying the provider.

The laboratory may refuse equipment that presents an unknown health or safety risk.

7. Include the Necessary Accessories

Some instruments cannot be calibrated correctly without their associated accessories.

Depending on the equipment, include:

• Measurement probes
• Temperature sensors
• Pressure hoses
• Test leads
• Clamps
• Adapters
• Connectors
• Power supplies
• Chargers
• Batteries
• Communication cables
• Software interfaces
• Reference attachments
• Operating manuals
• Special fixtures
• Protective cases

Clearly label each accessory so that it can be returned with the correct instrument.

Before packing, confirm with the provider which accessories are required. Unnecessary components should generally remain at your facility to reduce the risk of loss.

8. Back Up Important Instrument Data

Digital instruments may store readings, settings, user profiles, alarm limits, calibration factors, or historical information.

Before calibration:

• Download important measurement records
• Back up device settings
• Record configuration values
• Save alarm limits
• Export required reports
• Document communication settings
• Protect confidential information
• Remove unnecessary personal or customer data

Some calibration, adjustment, firmware, or repair processes may reset stored information.

Ask the provider whether instrument memory or settings may be affected during servicing.

9. Record the Instrument’s Current Settings

Document important settings before the instrument leaves your facility.

These may include:

• Measurement units
• Display resolution
• Range selection
• Alarm settings
• Correction factors
• Date and time
• Logging intervals
• Probe configuration
• Communication settings
• User-defined programs
• Automatic shut-off settings

Photographs or screenshots can provide a useful reference.

After the instrument is returned, compare its settings with your records before placing it back into service.

10. Decide Whether Adjustment Is Authorised

Calibration and adjustment are not the same process.

Calibration compares an instrument’s results with a reference standard and documents the measurement difference.

Adjustment changes the instrument to improve its measurement performance.

Your calibration request should clearly state whether the provider is authorised to make adjustments.

If adjustment is permitted, consider requesting:

• As-found results before adjustment
• Details of adjustments performed
• As-left results after adjustment
• A statement confirming the final instrument status

As-found results are particularly important because they show how the instrument was performing when it arrived at the laboratory.

Without these results, it may be difficult to assess whether earlier measurements were affected by instrument error.

11. Package Instruments Carefully for Transportation

Measuring equipment can be damaged by shock, vibration, moisture, dust, pressure, or extreme temperature during transportation.

Use packaging appropriate for the instrument’s sensitivity.

Good packaging practices include:

• Using the original protective case where available
• Selecting a strong outer box
• Placing cushioning around all sides
• Protecting displays and delicate controls
• Securing probes and loose accessories
• Covering open ports and fittings
• Using anti-static protection where required
• Protecting equipment from moisture
• Preventing movement inside the package
• Applying fragile-handling labels where appropriate

Do not allow heavy accessories to move freely beside a delicate instrument.

For sensitive or high-value equipment, consider using specialised transport arrangements.

12. Complete the Calibration Service Form

Provide clear documentation with every calibration request.

The service form should include:

• Business name
• Contact person
• Phone number and email address
• Return-delivery address
• Instrument identification
• Make, model, and serial number
• Required calibration points
• Required tolerance
• Calibration type
• Purchase-order details
• Adjustment authorisation
• Known faults or damage
• Required completion date
• Certificate requirements
• Special handling instructions

Keep a copy of the completed request form for your records.

Clear documentation reduces the need for additional communication and helps prevent misunderstandings.

13. Plan for Instrument Downtime

Laboratory calibration means the instrument may be unavailable for several days.

Before sending it, determine how operations will continue during this period.

Your business may need to:

• Arrange a backup instrument
• Reschedule measurement activities
• Notify affected departments
• Adjust production plans
• Use an approved spare device
• Book calibration during planned shutdowns
• Consider an on-site calibration service
• Send instruments in smaller groups

Avoid sending every instrument used for the same critical task at once unless suitable replacements are available.

A planned calibration schedule can help minimise disruption.

14. Prepare the Work Area for On-Site Calibration

When calibration is performed at your facility, the work area should be prepared before the technician arrives.

Provide:

• Safe access to the equipment
• A clean and stable working area
• Suitable electrical power
• Appropriate environmental conditions
• Required permits or inductions
• Equipment shutdown arrangements
• Technical information
• An authorised site contact
• Access to required fittings or connection points
• Separation from production hazards where possible

Inform the provider about site-specific risks, personal protective equipment requirements, restricted areas, and safety procedures before the appointment.

If equipment must be removed from service, complete the required isolation or lockout process before calibration begins.

15. Control the Instrument’s Environment Before Calibration

Some instruments require time to stabilise after transportation or environmental changes.

Temperature, humidity, vibration, electrical interference, and pressure can influence calibration results.

Depending on the instrument, the calibration provider may need to:

• Allow the device to reach laboratory temperature
• Stabilise sensitive sensors
• Warm up electronic equipment
• Remove condensation
• Protect equipment from vibration
• Maintain controlled humidity
• Allow pressure components to equalise

Avoid leaving instruments in hot vehicles, direct sunlight, wet conditions, or other unsuitable environments before calibration.

Follow any stabilisation instructions provided by the laboratory.

16. Inform the Provider About Previous Problems

Tell the calibration provider if the instrument:

• Has been dropped
• Has been overloaded
• Was exposed to extreme temperatures
• Has produced unstable readings
• Was recently repaired
• Has undergone component replacement
• Displays error messages
• Has failed an internal check
• Has been used outside its specified range
• Produces results that differ from another instrument

Do not hide known faults in the hope that calibration alone will correct them.

Accurate information allows the technician to assess the equipment safely and determine whether calibration, repair, or further testing is appropriate.

17. Maintain a Chain of Custody for Critical Instruments

Businesses operating in regulated or quality-controlled environments may need to document who handled an instrument and when it was transferred.

A chain-of-custody record may include:

• Instrument identification
• Date and time of dispatch
• Person releasing the instrument
• Courier or transport details
• Condition before dispatch
• Accessories included
• Date received by the laboratory
• Date returned
• Condition after return
• Person accepting the instrument

This process can be especially useful for high-value, sensitive, or business-critical equipment.

What Happens After the Instrument Reaches the Calibration Provider?

A typical professional calibration process may include:

1. Receiving and identifying the instrument
2. Reviewing the service request
3. Inspecting the equipment and accessories
4. Confirming the calibration requirements
5. Allowing the instrument to stabilise
6. Completing appropriate functional checks
7. Comparing measurements with reference standards
8. Recording as-found results
9. Adjusting the instrument if authorised
10. Recording as-left results where applicable
11. Reviewing the results
12. Issuing a calibration certificate
13. Applying a calibration label where appropriate
14. Packaging and returning the instrument

The exact procedure depends on the instrument type, required accuracy, service provider, and customer instructions.

What Should You Check When the Instrument Is Returned?

Do not immediately return the instrument to operation without reviewing its condition and calibration documentation.

Check:

• Instrument identity
• Serial number
• Physical condition
• Returned accessories
• Calibration certificate
• Calibration date
• Calibration results
• Test points
• Measurement uncertainty, where applicable
• Traceability information
• Pass or fail status
• Adjustment details
• Recommended recalibration date
• Calibration label
• Instrument settings

Confirm that the results meet your organisation’s acceptance criteria.

A calibration certificate does not automatically mean that an instrument passed. Review the reported results carefully.

What Should You Do With an Out-of-Tolerance Result?

An out-of-tolerance result means the instrument’s measurement error exceeded the applicable acceptance limit at one or more calibration points.

If this occurs, your business may need to:

• Remove the instrument from service
• Review the as-found results
• Determine when the instrument was last known to be accurate
• Identify measurements completed since that date
• Assess whether products, processes, or decisions were affected
• Repeat important measurements where possible
• Arrange adjustment or repair
• Document the investigation
• Review the calibration interval
• Update relevant quality records

The potential impact depends on the size of the error, how the instrument was used, and the importance of the measurements.

Common Instrument-Preparation Mistakes to Avoid

Frequent mistakes include:

• Sending equipment without a serial number
• Providing no calibration instructions
• Forgetting essential probes or accessories
• Sending contaminated instruments
• Failing to report known damage
• Packaging instruments poorly
• Not backing up stored data
• Sending equipment with flat batteries
• Failing to authorise or reject adjustment
• Not arranging backup equipment
• Ignoring previous out-of-tolerance results
• Returning instruments to service without reviewing certificates

A simple preparation checklist can prevent many of these problems.

Instrument Calibration Preparation Checklist

Before sending an instrument for professional calibration, confirm that you have:

• Identified the instrument correctly
• Verified its make, model, and serial number
• Reviewed its calibration history
• Confirmed the required calibration points
• Defined the required tolerance
• Selected the appropriate calibration type
• Inspected the equipment for damage
• Completed a functional check
• Cleaned and decontaminated the instrument
• Included necessary accessories
• Backed up important data
• Recorded instrument settings
• Confirmed adjustment authorisation
• Completed the service-request form
• Packaged the equipment securely
• Arranged replacement equipment if required
• Recorded dispatch details
• Informed the provider about known problems

Choosing a Professional Calibration Provider in Australia

When selecting a calibration service provider, consider:

• Technical experience
• Instrument coverage
• Available calibration ranges
• Measurement capabilities
• Traceability of reference equipment
• Accredited calibration options
• Laboratory and on-site services
• Certificate quality
• Turnaround time
• Repair and adjustment capabilities
• Equipment collection and delivery
• Customer support
• Experience with your industry

Provide the calibration company with complete information about your instrument and intended application so it can recommend a suitable service.

Final Thoughts

Preparing instruments correctly is an important part of professional calibration.

Clear identification, suitable cleaning, functional checks, complete accessories, accurate service instructions, secure packaging, and proper documentation can help prevent delays and support reliable calibration results.

Businesses should also plan for equipment downtime, review calibration certificates carefully, and investigate any out-of-tolerance results before returning instruments to service.

A well-organised preparation process helps Australian businesses protect their equipment, maintain measurement accuracy, reduce disruption, and manage calibration requirements more effectively.

Professional calibration begins before the instrument reaches the laboratory. Proper preparation helps ensure the service is completed safely, efficiently, and according to the instrument’s intended use.