RCD Tester Calibration

Why Choose Our RCD Tester Calibration Service

Industry Leaders Nationwide for Professional RCD Tester Calibration Services

Zedflo has been a market leader in test and measurement equipment since 1982. In 2014 we established a service and repair laboratory, and in 2018 achieved NATA accreditation for compliance with ISO/IEC 17025—Calibration. Our quality and customer service policies focus on providing the very best service.

Zedflo proudly offers calibration services with uncertainty of measurement capabilities among the best in Australia. We have invested in high-performance equipment across our laboratory.
We constantly strive to give the best customer service, which clients have come to expect over our 40+ year history in test and measurement.

Our NATA accreditation is an independent testament to our attention to detail, commitment to working to international standards in quality and technical management and metrological traceability.

Calibration services
Calibration services

Our Accreditation

  • NATA Accredited Laboratory operating in accordance with ISO/IEC 17025
  • Authorised Metrel Service and Calibration Centre
  • Authorised Additel Service and Calibration Centre

In house repair service

  • OEM backed and authorised service and repair agents for many instruments in our range.
  • That means less downtime in the event a fault or issue is found.


  • Our NATA accreditation scope has some of the best uncertainties in Australia.
  • Advice you can rely on, with 40+ years experience in the industry.

Fast & Easy

  • Standard turn around under 1 week.
  • Expediting options available (as quick as same business day).
  • Express freight options at great rates.

Why Calibrate?

The successful operation of any process depends on the accuracy of each instrument in the control loop. It is essential that sensors in a system are properly calibrated for the entire loop perform reliably. This requires suitable calibration methods to be used, trained personnel, and metrological traceability being maintained. Choosing the right calibration laboratory can be as important for lifetime accuracy and reliability of an instrument as selecting the right equipment in the first place.

Accredited Calibration:
Accredited calibration helps you objectively understand an instrument’s performance, while giving you peace of mind that the results can be trusted.

Zedflo’s NATA accredited services include:

  • A calibration certificate, bearing the NATA emblem
  • Reporting of results, both prior to and following adjustment if required
  • Free instrument adjustment to improve performance where possible
  • Method selection and statement of compliance following strict criteria

More Info On RCD Tester Calibration

Detailed NATA RCD Tester Calibration Services

Zedflo Australia, one of the best calibration companies in WA since 1982. We specialise in providing NATA-accredited calibration services for pressure and electrical equipment. Our commitment to precision and reliability ensures that your instruments perform with high levels of accuracy.

View our full accredited scope on the NATA website:

A basic summary of our NATA accredited scope:


We can calibrate virtually all pressure reading devices

  • Up to 415MPa / 60,000PSI
  • 0.009% Uncertainty capable for precision devices up to 105MPa (15,000PSI)
  • Excellent low pressure capability – 0.65Pa uncertainty on draught pressures
  • Barometers and absolute pressure transmitters with current, voltage or frequency outputs


DMMs, Meters, Calibrators

  • DC Voltage up to 1050V, from 5ppm uncertainty
  • DC Current up to 30A, from 20ppm uncertainty
  • AC Voltage and Current 10Hz to 100 kHz, from 0.02%
  • Resistance up to 10 GΩ, Capacitance up to 200 mF

HV Insulation and Continuity

  • Insulation Resistance up to 10GΩ, 10kV test voltage
  • MicroOhm Continuity from as low as 1μΩ at 100A test current

Frequency and Time

  • Frequency calibration up to 100 MHz on counters, meters, calibrators or testers.  From 5 μHz uncertainty
  • RCD Testers, trip time uncertainty from 0.3ms

Resistor Sets and Decade Boxes

  • Standard Resistors, Calibration Boxes,
    Insulation Test Boxes, Decade Boxes etc…
    From 10 μΩ to 10 GΩ
  • NATA Accredited Laboratory operating in accordance with ISO/IEC 17025
  • Authorised, OEM backed services
  • Fair and affordable rates
  • 120 day after repair warranty (terms and conditions apply)
  • Fast standard turnaround times, typically under 1 week
  • Expedited service options for same or next day turn around
  • Guarantee to offer professional, impartial advice for your repair or calibration with 40+ years experience in the industry

We have a few options you can choose from:

Complete one of the options from ‘How to organize a calibration?’

You can send us your instrument, or drop it into us during business hours

If urgent, let us know and we can offer an expedited service for an additional fee

Once the instrument arrives we will send you a formal quotation for your approval. (or seek approval in person)

You can contact us at any time for a status update

After your approval we will perform the quoted works.

Standard turn around is 1 week.

This will vary with work loads but we are often faster than that, calibrations are typically worked on in order of receival/approval

When completed we will send you an invoice for payment.

If you are on a ‘30 day trade account’ then we will process as per your PO or agreement.

After payment is cleared (or PO is processed for account customers), we will inform you that the goods can be collected, or if you have opted for shipping we will typically dispatch same or next business day.

You can also pay in store at time of collection.

Normal business hours

Monday to Friday, 8am to 4:30pm

We are closed on public holidays

Accepted payment methods
  • Direct bank transfer
  • Card payment over the phone (Mastercard & Visa only)
  • Eftpos payment in store (Mastercard & Visa only)

We typically have a standardized pricing structure for calibrations

  • Most of the time we can provide a quote/estimate even without seeing the instrument in person.
  • Some instruments may require an inspection prior to formally quoting
  • Be aware a quote is only an estimate, the quote may need a variance after we have inspected or even begun the calibration procedure, for example if we find damage or faults with the instrument that were not expected and not within the initial scope of the job.
  • We will contact you with a revised quote before proceeding further where necessary.

We have a minimum fee of $80 +GST, this applies as a minimum inspection fee and also a minimum calibration attempt fee for any instrument processed through our facility.

  • Instruments that fail a calibration are generally still chargeable up to the full quoted price, we may at our discretion charge a lesser fee depending how much time and effort was spent working on the instrument.
  • For failed instruments if possible we may be able to offer a repair or replacement
  • Some instruments may carry a larger minimum fee, for example in cases where we need to send the instrument to a 3rd party for assessment, in these cases before moving forward we will quote an elevated minimum fee to cover the associated freight costs and 3rd party assessment fees.

Typical internal flow of a calibration

Typically, the whole calibration process is completed within 1 week.

  • This does vary and depends on various factors, but more often than not we are actually quicker.
  • Your instrument will go through various stages during a typical calibration, we are efficient at moving it between various stages in the process but sometimes delays can happen, we will inform you if we expect any kind of delay.
  • Some calibrations may be sent to a 3rd party partner or supplier, in which case they will carry a longer than our standard turnaround time. We do, however, strive to provide the very best and accurate estimate of turnaround time at time of quoting.

For expedited ‘same day’ or ‘next day’ service, Zedflo is the best calibration service to look to!

We are always busy and do have a constant stream of work in our laboratory, instruments are usually worked on in the order they are received, and then in order of confirmed approval to proceed with quote, but for a fee your instrument can jump the queue when you require a fast turn around.

The fee will vary, and is subject to availability, but as a typical guide:

  • Next business day turn around add 30% to the normal fee
  • Same day (next on bench) turn around add 50% to the normal fee

Contact us today for more information about how we can help you with your instrument calibration needs.


Analogue Pressure Gauge
Digital Pressure Gauges
Pressure Transmitters & Transducers
Pressure Calibrators
Pressure Switch Setting


Clamp Meters
Installation Testers
RCD Testers
Insulation Testers
Loop Impedance
Earth Testers
Process Calibrators
Loop Calibrators

Turn around:

We know rapid turn around is important, we endeavour to repair or calibrate your equipment as quickly as possible, we advise a typical lead time of 7 days but we can often turn around calibrations next business day depending on our work load.

Other Calibrations:

We can calibrate various other instruments too, it doesn’t have to be Metrel or Additel – below is a current list of products we are capable of calibrating, if you have something not on this list, please make an enquiry.

Residual Current Device (RCD) testers are critical in maintaining electrical safety. These sophisticated devices are essential for testing electrical systems to prevent hazards like electric shocks and fires, ensuring safety in commercial and industrial environments. Regular calibration of RCD testers is crucial for accurate performance, protecting your business from potential liabilities and enhancing operational safety. By prioritising accurate and reliable testing with RCD testers, you safeguard not only your infrastructure but also the well-being of your personnel.

What is an RCD Tester?

An RCD tester safely trips your RCD (residual current device) to ensure it operates safely during an abnormal electrical event or whether your electrical system is faulty.

Key Functions and Uses of RCD Testers

Trip Time Management

One of the primary functions of an RCD tester is to measure the RCD’s tripping time, which is the time it takes for the RCD to break the circuit once a fault is detected.

Accurate measurement of tripping time is crucial, as it indicates how quickly an RCD can respond to prevent electric shock or fire hazards.

RCD testers simulate fault conditions to test whether RCDs trip within the timeframes specified by safety standards.

Tripping Current Measurement

RCD testers also measure the tripping current, the minimum current at which the RCD will trip.

This function ensures that the RCD is sensitive enough to detect and respond to dangerous current levels, protecting against electrical faults that could lead to serious injury or damage.


Ramp Test Function

The ramp test function gradually increases the fault current to determine the exact current level at which the RCD trips.

This test is important for assessing the sensitivity of the RCD and ensuring that it operates within the specified current range.

It helps identify RCDs that are either too sensitive, causing unnecessary tripping, or not sensitive enough, posing a safety risk.

Use in Routine Safety Checks

RCD testers are used in routine safety checks and maintenance of residential, commercial, and industrial electrical installations.

They ensure that RCDs function correctly and provide the necessary protection against electrical faults, contributing to overall electrical safety.

Compliance and Certification

Testing RCDs with an RCD tester is a requirement for compliance with electrical safety standards and regulations.

It is also essential for electricians and technicians to certify that electrical installations are safe and meet the necessary safety criteria.

Impact of Inaccurate RCD Readings

Inaccurate RCD readings can have far-reaching consequences, from compromising the safety of individuals to legal ramifications for businesses and professionals. Understanding the impact of these inaccuracies underscores the critical need for regular calibration and maintenance of RCD testers.

Compromised Safety

The most immediate and concerning impact of inaccurate RCD readings is the potential compromise to safety. RCDs are designed to prevent electric shock by rapidly disconnecting the electricity supply when a fault is detected. If an RCD tester provides inaccurate readings, a malfunctioning RCD might not be identified, leaving circuits unprotected.

Increased Risk of Electrical Fires

Inaccurate RCD readings can also increase the risk of electrical fires. An RCD that fails to trip at the correct, current level can allow electrical faults to escalate unchecked, potentially leading to overheating, sparking, and, ultimately, fires.

Legal and Financial Repercussions

Inaccurate RCD readings that lead to undetected faults can result in non-compliance, exposing businesses to legal action, hefty fines, and damage to reputation.

Moreover, in the event of an accident, the inability to demonstrate due diligence in maintaining and calibrating RCD testers can lead to severe legal and financial consequences.

All services including repairs and calibrations are subject to our standard terms and conditions

Contact Zedflo – Your Local Experts in RCD Tester Calibration

If you need professionals to perform certified checks on your RCD Testers by Australian national standards, turn to Zedflo.

Since 1982, we’ve built a reputation on trust and reliability, ensuring your instruments work as intended.

Contact us today to learn more about how we can help.

Contact Us

Get in contact with us today to see how we can help. Please fill out the enquiry form below and we will get back to you as soon as possible.


Opening hours

Monday to Friday: 8am to 4:30pm
We are closed on public holidays

Address and contact information

Business Name / ABN

Process Control Instrumentation Pty Ltd T/A Zedflo Australia
ABN 58 120 609 814

RCD Tester Calibration FAQ

Calibration frequency can depend on several factors, including the manufacturer’s recommendations, the frequency of use, and the environmental conditions where the tester is used.

Annual calibration is recommended, but more frequent calibration may be necessary for testers used heavily or in harsh conditions.

Signs that your RCD tester may need calibration include inconsistent or suspect readings, physical damage to the tester, a failed self-test (if applicable), or exposure to environmental extremes.

Failing to calibrate an RCD tester can lead to undetected faulty RCDs, increased risk of electric shock or fire, non-compliance with safety regulations, and potential legal and financial repercussions.

Calibration services

Zedflo operates an ISO17025 NATA Accredited Calibration Lab.

You can view our NATA scope here

We are able to calibrate all popular and leading brands including Additel, Fluke, Druck, Beamex, Crystal, Transmation, Wika, Metrel, Megger, AEMC and many more