Core Summary
The multifunction calibrator appears to have a comprehensive parameter list, but upon purchase, it often turns out that half of the functions are unusable or not covered as expected. Before selecting a model, it is important to clearly list the types of meters to be calibrated and their required accuracy levels, and then highlight the key features against the function list. This approach can help avoid unnecessary expenses.
1. First, let's discuss which types of tables you need to calibrate
Electrical quantity is the major component
Voltage, current, and resistance are the three main types of objects that require on-site calibration. First, determine the proportion of each type in daily work to decide whether to invest in a multi-function model.
Don't miss out on process signals
In some scenarios, it is necessary to calibrate temperature signals such as thermocouples and RTDs, or frequencies. If such calibration is only occasionally required, it may be more economical to use an external standard source rather than purchasing a high-end calibrator.
II. Alignment of Accuracy Levels for Tested Meters
The calibrator should be much more accurate than the instrument being calibrated
The industry generally requires that the accuracy of the standard instrument should be several times better than that of the instrument being calibrated [please verify]. Since the instrument being calibrated is an ordinary industrial instrument, there is no need to pursue laboratory-level standards.
Don't forget to inquire about the traceability certificate
The calibrator itself must have a traceable calibration certificate, and it can only be used for formal calibration if the certificate is within its validity period. When purchasing, make sure to clarify the certificate period.
III. Portable or Desktop, It Depends on Where You Use It
If there are multiple locations on site, choose a portable one
Battery-powered portable models like the 1044 are ideal for inspection tours, outdoor work, and multiple locations. Desktop models offer greater precision and resources, but are not portable.
Laboratory fixed workstation
The 5025C, a versatile benchtop calibrator, is ideal for centralized operations in metrology laboratories, featuring a more comprehensive set of interfaces and resources.
IV. Independent Value of TEU
Why is it listed separately
1053 Decade inductance boxes and 1067 resistance boxes are basic passive standards. They do not rely on electronic circuits, are stable over time, and are suitable for daily verification at the workshop level, serving as backups for electronic devices.
V. Procurement Checklist
List the types of calibrated tables and their precision requirements
Ensure that the accuracy of the calibrator is superior to that of the instrument being calibrated and that it comes with a valid certificate
High proportion of on-site operations → Prioritize portability
Conduct routine verification of passive TEU to reduce electronic dependency
Inquire about the warranty and traceability period
IV. Calculate what needs to be calibrated before making a purchase
Don't immediately pursue high-precision standard sources. First, list out the meters and sensors that need calibration, determine what standard quantities are required, and then decide which items to bring. Field equipment emphasizes "sufficiency and lightness"; it's not the more comprehensive the better. If you're unsure how to compile the list, we can work through it together. Many on-site inspections can actually be adequately handled with a portable calibrator and one or two standard boxes, eliminating the need to bring down the desktop standard sources every time.
Parameter Table (Selection Comparison)
> The above is a selection guideline. Specific values are subject to the original datasheet provided by Time Electronics. QN TECHNOLOGY offers model selection verification for models such as 1044 / 5025C / 1053. We welcome you to send us the list of meters for comparison.
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