Time Electronics User Manual
5051 Plus and 7051 Plus Multifunction Calibrators v2.1
xx51+ Multifunction Calibrators Page 62 of 64
11. Re-Calibration
Calibration of the xx51 is performed using a program to adjust the internally stored calibration factors,
no hardware adjustments are required and it is not necessary to dismantle the instrument.
A separate Calibration Manual is available from Time Electronics or their authorised dealer on
request.
12. Fault Diagnosis
Operations involving the removal of the top cover. Before proceeding, ensure that the mains
supply and any inputs have been disconnected. Failure to do so may expose live terminals and
present an electrical shock hazard.
12.1. Fault Check List
Mouse, Keyboard or Printer does not function
Check that the USB connection cables are correctly located. Check that the 4 port USB hub is
connected correctly.
DMM Module fuses
A 3.15A slow blow fuse protects the current measuring ranges from damage due to overload, and an
8A anti-surge fuse protects the mains power unit.
The DMM module is located in the primary console and is accessed by first removing the console top
cover. It is a white module located on left side of the rear panel near to the console exhaust fan. The
module has 2 fuse holders which are labelled with the appropriate values.
Mains generated interference
It is recommended that the xx51 be operated from a clean AC mains power supply. It is strongly
recommended that a filtered mains stabilizer is used. The effects of interference entering the xx51 are
crashing of the control PC and malfunction of one of more of the many microcontrollers located inside
the unit.
Time Electronics maintain a technical support service and in the event of difficulty we are ready to
provide technical advice by telephone, fax, or email.
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