Megger TTR310 - Calibration

M
AVTMTTR310 Rev 8 May 2016
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5. When the fuse holder is installed in the single fuse position, apply the
screwdriver as shown and gently pry up. Use screwdriver as shown, do not
use fingers.
When the fuse holder is installed in the dual fuse position, it would normally
release as soon as the door is open.
Calibration
A complete performance and calibration check should be made at least once
every year. This will ensure that the TTR310 test set is functioning and calibrated
properly over the entire measurement range. The 3-phase TTR310 calibration is
performed on each new or repaired unit before sending it to a customer. There is
a special 3-phase TTR310 final calibration procedure which requires a NIST-
traceable test equipment to be used. As a result of such calibration procedure,
each TTR310 test set may be NIST certified.
To check the 3-phase TTR310 calibration at a customer site or in the field, the
Megger TTR Check Box (Catalog No. 550555) or equivalent standard should be
used.
To perform a quick simplified calibration check, the Megger TTR Check Box
(Catalog No. 550555) may be used. The last standard has eleven switchable turns
ratio settings which cover the turns ratio range from 0.8:1 to 2000:1. Using these
Calibration Standards will confirm proper calibration of TTR310 test set.