The DR900 won't zero and the reading displays "XXX." What could be causing this?

Document ID

Document ID TE638

Published Date

Published Date 04/07/2017
Question
The DR900 won't zero and the reading displays "XXX." What could be causing this?
Summary
DR900 does not zero and shows "XXX
Answer
On the older software version (v1.020), the actual error code was not displayed. On the newer version (v1.026), the error codes are displayed. Update the instrument so that the error code can be viewed by following the instructions in the link below.

How is a DR900 software update performed?