The METRAHIT multimeter no longer maintains the specified measuring accuracy in some measuring functions/measuring ranges. How can it be readjusted?

• The adjustment of our earlier METRAhit 12S-16S multimeter series (produced up to 2000) is carried out via instrument-internal adjustment elements according to type-specific adjustment instructions. These can be obtained from us for the respective type for a fee. Please contact our product support.
  
• The adjustment of the former multimeter type METRAhit 18S (produced until 2001) is carried out after flipping an internal switch of the device via the function keys of the device (at more than 100 measuring points!!). The type-specific adjustment instructions can be obtained from us for a fee. Please contact our product support.
  
• The adjustment of our former multimeter series METRAhit 22S/M-29S (produced until 2007) is only possible via the (infrared) data interface of the instruments via adapter BD232 or USB-Hit, based on a specific interface protocol as well as a very complex algorithm to determine the numerous correction values. A written documentation for this is not available. Instead, we offer our METRAwin 90-FJ calibration and adjustment software. In conjunction with a suitable MultiProduct Calibrator (FLUKE 5500A, 5520A) and a PC with GPIB interface, it enables fully automatic calibration of METRAhit 22S/M-29S multimeters (using the calibration procedures supplied) on the one hand and serves as convenient, universal calibration software for multimeters of any type and make or other electrical measuring instruments on the other. This high-priced software is usually only profitable for larger calibration laboratories that frequently have to calibrate/adjust these multimeter types.
  
• The calibration of our current multimeters of the METRAHIT Starline family (X-TRA, T-COM, BASE, PRO, TECH, EXTRA, EBASE, ESPECIAL, ETECH, ENERGY, ULTRA) is also performed via their infrared interface using the USB X-TRA interface adapter. For this purpose, when a calibration signal is applied, the correct calibration values are sent to the instrument by specific setting commands in ASCII format. The instrument then calculates the correction factors itself and stores them. The universal terminal program "Docklight" can be used for data transmission; see http://www.docklight.de/info.htm. The free test version of this software is sufficient; download from http://www.docklight.de/download.htm . However, suitable adjustment procedures are only available for individual multimeter types and measuring functions, which we may provide free of charge. For the types EXTRA, EBASE, ESPECIAL, ETECH and METRAport 40S we have also created calibration and adjustment procedures for the FLUKE MET/CAL software.
  
• In the same way as the METRAHIT Starline series, it is also possible to adjust the milliohm multimeter METRAHit 27M/I, the precision multimeter METRAHit 30M and the calibrators METRAHit 28C/28C light, METRAHIT CAL and METRACAL MC.