Comtest is offering what Fluke calls the “gold standard” of multifunction calibration – the very impressive 5730A high-performance multifunction calibrator. The 5730A calibrates a wide range of digital multimeters, up to long-scale 8,5 digit DMM’s as well as RF voltmeters when equipped with the wideband option. This model features improved specifications that will help users increase test uncertainty ratios (TURs) and increase test confidence. Also, the improved specifications will reduce the need for guardband, giving users confidence and peace of mind with calibrations.
The device is designed for calibration professionals who require the most accurate dc/lf signals available in a multifunction calibrator. Metrologists value the performance and reliability of this instrument. This calibrator incorporates the latest technology, such as surface mount technology and modern digital components, that have enabled Fluke Calibration to advance the proven design of the 5700A/5720A and create the next generation of high-performance multifunction calibrators.
It keeps many of the front-panel details that characterize its predecessors while adding a new full-colour touch screen display to enhance usability and ease calibration. Users enter values via a familiar, calculator-style keyboard, working naturally from left to right. A graphical user interface features easy-to-read, easy-to-use menus, as well as access to common functions. Status indicators for ‘operate’, ‘standby’, and ‘hazardous voltage’ appear on the screen in bright letters or icons - easily recognizable – even from across the calibration lab.
The redesigned front panel features many new improvements, like Visual Connection Management output terminals that light up to show which terminals are active, guiding the user to make the correct connections. The handles and knob are over-moulded for comfort and feel. USB ports are placed both on the front and rear of the unit. Use the port at the front to download internal calibration constants; use the rear port for remote communication with a PC – or choose the LAN, IEEE or serial interfaces.
The 5730A calibrator features Artifact Calibration. Only three artifact standards – 10 V dc reference and 1 Ω and 10 k Ω resistance references – are required to calibrate all ranges and functions to full specifications. Front panel GUI instructions prompt the operator to make connections and inputs each step of the way. The calibrator controls the process, which takes only about an hour, compared to several hours using traditional calibration methods. In addition to saving time and equipment costs, Artifact Calibration can extend the time between calibrations of the 5730A to two years before a full verification check by a Fluke Service Center is required. And, because the 5730A can tolerate operating temperatures between 15 and 35°C, it can be calibrated where it’s used, rather than having to be shipped to a standards laboratory for calibration.
Artifact calibration
When Artifact Calibration was first introduced in the Fluke 5730A, customers asked many questions about traceability because they were surprised that one could calibrate so many ranges and functions with only three external standards. Today many metrologists rely on Artifact Calibration to maintain their Fluke calibrators at 90-day specifications for up to two years. Significant savings can be realized in calibration costs by only performing a full verification at a certified Fluke Service Centre every two years. The time savings are also significant, as Artifact Calibration allows the 5730A to remain in service and conducting calibrations when it would otherwise be unavailable due to shipping and service time.
Cal Check
The built-in automated Cal Check function checks every range and function against a set of dedicated internal standards to monitor the drift of each. These Cal Check results can be downloaded to a computer via the USB port conveniently placed on the front of the unit to develop control charts predicting the calibrator’s long-term performance.
Improving calibration
The most prevalent long-scale digital multimeters in the world are the Fluke Calibration 8508A and the Agilent 3458A. Due to the high level of accuracy of these two 8,5-digit DMMs, there are several points where calibration professionals are forced to use a technique known as guardbanding. This method decreases the measurement uncertainty for a particular value to guarantee the calibrated value falls within the appropriate 99% or 95% confidence interval. In designing the 5730A, Fluke Calibration worked diligently to bring users even better performance specifications to help address some of these “problem points.”
High current output to 120 A
Paired with a Fluke Calibration 52120A Transconductance Amplifier, the 5730A can output up to 120 A, and display the output on the 5730A touch screen display. Operating in closed-loop mode with the 52120A, the 5730A maintains the best current accuracy over the widest range of calibration workloads. The 5730A is also compatible with the Fluke Calibration 5725A Boost Amplifier.
Contact Comtest, Phone 010 595-1821, sales@comtest.co.za , www.comtest.co.za
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