In the DEL-150 system the name of parameter is “Measured depth”. The parameter is measured by DPS -140 ( A), DPS – 140 ( E), DPS -140 (P).
It’s necessary to have “weight on hook” and “Inlet mud pressure” parameters for automatic calculation.
The accuracy parameter depends on accuracy measurements of block height at the moment of gauge calibration and the sensor conjunction with a winding barrel.
Measured depth is the distance from the mouth to the bottom-hole.