How can we be sure that the AT3600 is accurate between calibrations?
Voltech is, and has always been, committed to striving for constant engineering improvements. Not just in terms of new product development, but also in the improvement of current products.
Our focus for improvement of current products lies with both the firmware and the hardware, and we are intent on maximizing the accuracy and reliability of all of our products.
Whenever you send your instrument into Voltech for service (either repair or calibration), we will upgrade the instrument to the latest revisions of hardware and firmware. No other service site but Voltech can offer this for our products – they may well upgrade the firmware (although many do not even bother with this), but none of them have the latest Voltech hardware designs.
By choosing Voltech for your product service, you are choosing to keep your instruments up to date, and performing to the height of their capability and reliability.
The AT self test is a good way of verifying that an AT is within calibration, it checks that the same readings are measured on its different measurement ranges amongst many other verifications.
Note that a power ON self-test is also performed every time the instrument is powered on. A more thorough self-test is run via a front panel self test soft key.
When performing a self-test please ensure that no fixture is fitted and that there are no interface RS232 cables connected. The safety interlock needs to be fitted however for the AT3600.
This, combined with annual calibration at Voltech (including pre-cal data) is normally sufficient to guarantee performance.
For increased confidence the calibration interval may be reduced, or regular checks made with commercially available 'standard' parts.