Fluke 8588A: An 8.5-digit multimeter built for modern calibration and digitising
In a modern calibration or metrology laboratory, the requirements for a reference multimeter differ significantly from those of a decade ago. Today, laboratories require a single instrument that offers ultra-low multimeter uncertainty, handles high-current and capacitance measurements, and increasingly, digitises signals for more in-depth analysis – all without compromising the accuracy expected from an 8.5-digit reference multimeter.
Fluke Calibration designed the 8588A reference multimeter to address these precise requirements. It builds upon the established legacy of the 8508A long-scale DMM but expands that platform into a comprehensive precision measurement system, combining reference-grade accuracy, high-speed digitising, and modern data analysis in a single instrument.
Instead of forcing laboratories to choose between a fast digitiser and a highly accurate multimeter, the 8588A integrates both capabilities. This simplifies setups, reduces equipment requirements, and enhances confidence in results.
A true 8.5-digit multimeter for today's laboratories
Essentially, the 8588A is a reference multimeter designed for calibration, standards laboratories, and high-end manufacturing and test environments. It provides the resolution and stability expected from an 8.5-digit multimeter, while enhancing how engineers and metrologists interact with data.
Where traditional long-scale DMMs focus purely on static measurements, the 8588A expands that role. You still get the accuracy and stability required to control measurement uncertainty, but you also gain tools to:
- Analyse measurement stability and noise
- Capture large data sets for statistical evaluation
- Explore signal behaviour over time
- Support automated and system-level calibration workflows
This makes the 8588A not just a measurement endpoint, but a measurement analysis platform.
Built-in digitising: When a multimeter needs to do more
One of the most important features of the Fluke 8588A is its ability to digitise signals.
In normal measurement mode, you can measure frequencies up to 10 MHz. In digitising mode, you can extend this further–up to 20 MHz–while sampling as fast as every 200 nanoseconds.
This enables applications that previously required a separate digitiser or oscilloscope, without compromising the accuracy expected from a reference multimeter.
Many instruments can digitise. However, fewer can digitise while maintaining reference-grade performance. This distinction is crucial when considering both signal behaviour and measurement uncertainty. With the 8588A, you no longer have to choose between a fast instrument and an accurate one—or manage, calibrate, and maintain two separate systems to achieve both.
Wider measurement capability in a single instrument
Beyond digitising, the 8588A expands the scope of what a long-scale DMM can cover in day-to-day laboratory work.
- Higher current: Measures up to 30 A, extending coverage beyond previous long-scale DMM limits.
- Capacitance measurement: This enables direct verification and calibration of capacitance functions on multi-product calibrators and other instruments.
- Ratio measurements with rear input: A rear input ratio option allows direct comparison of known and unknown standards, which helps reduce overall uncertainty by leveraging the short-term stability of the measurement range. This is similar in concept to using a null detector and is available in the 8588A/NULL METER model.
The result is fewer workarounds, fewer external instruments, and a more streamlined calibration workflow.
Designed for analysis, not just readings
The Fluke 8588A is not just about taking measurements—it is about understanding them.
Its modern graphical interface provides immediate access to statistical tools such as:
- Number of readings
- Standard deviation
- Minimum, maximum, and average values
Users can store up to 15 million readings internally, export data via USB, and integrate results directly into automated workflows. The display can also visualise waveforms, trends, and even harmonics, which are useful for quickly spotting issues that require deeper investigation.
While it is not a replacement for a full spectrum analyser, it provides metrologists and engineers with capabilities they have not previously had in a long-scale DMM: contextual information surrounding the numerical data.
How the Fluke 8588A compares to the Fluke 8508A
The 8588A builds directly on the strengths of the 8508A, extending the platform into digitising, higher current, and broader analysis capabilities. The following is a simple, practical comparison:
| Feature | Fluke 8508A | Fluke 8588A |
|---|---|---|
| Resolution class | 8.5-digit reference multimeter | 8.5-digit reference multimeter |
| Digitising capability | No | Yes (up to 20 MHz, 200 ns sampling) |
| Maximum current | 20 A | 30 A |
| Capacitance measurement | No | Yes |
| Ratio measurement (rear input) | No | Yes (standard) |
| Data analysis and visualisation | Limited | Advanced statistics, trends, waveforms, harmonics |
| Internal memory | Limited | Up to 15 million readings |
| User interface | Traditional | Modern graphical display |
Rather than replacing the 8508A with a small incremental update, the 8588A represents a broader shift: from a pure reference DMM to a reference measurement and analysis platform.
A modern reference multimeter for modern measurement challenges
The Fluke Calibration 8588A reference multimeter still delivers everything you expect from a high-end 8.5-digit reference multimeter: accuracy, stability, and confidence in your results. However, it also reflects how calibration and test environments are changing—where digitising, data analysis, and system-level automation are as important as raw specifications.
By combining reference-grade performance with digitising and advanced analysis tools, the 8588A helps laboratories reduce complexity, improve insight, and better control measurement uncertainty, all within a single, modern instrument.