G4 Multi Channel Weighing Instrument. PM/DT/HE Technical Manual

G4 Multi Channel Weighing InstrumentZero-tracking/Automatic zero settingIn the instrument the functions zero-tracking and automatic zero setting can beenabled. Zero-tracking gives a continuous zero setting by slow changes in zeroweight. The automatic zero setting performs zeroing of small negative gross weights.For both functions the following requirements should be met:- The zero point stays within the permissible range, deviation fromcalibrated zero less than -1 % to +3 % of Capacity.- No setpoint function is activated (armed).Zero-trackingZero-tracking is active when, in addition to the common requirements above,the following requirements are met:- Calibration parameter ‘Zero-tracking’ is set to On or On+AutoZero.- The gross weight is ‘good zero’ (deviation from zero less thanone quarter of Resolution).- The weight is stable (the text Motion not shown).- The rate of weight change is lower than the ‘zero-track.rate’, see below.The set-up parameter ‘Zero-track.rate’ determines the maximum permissible weightchange per minute for the zero-tracking. If parameter ‘Resolution’ is changed, the valueof ‘Zero-track rate’ will change correspondingly.Automatic zero settingAutomatic zero setting is active when, in addition to the common requirements above,the following requirements are met:- Calibration parameter ‘Zero-tracking’ is set to On+AutoZero.- The gross weight is negative.- The actual scale is in gross mode.- The weight has been stable (the text Motion not shown) for 5 seconds.MotionThe text ‘Motion’ may be shown to the right in the display. Motion condition exists if theweight change during a certain measurement period is greater than the window ‘MotionDetect Window’. The measuring period is one conversion time (‘Update Rate’) or atleast 200 ms.After the weight becomes stable, the text ‘Motion’ will still be shown for a short time,specified in parameter ‘No-motion delay’, instrument will regard the weight as unstableuntil the text ‘Motion’ has disappeared.When the text ‘Motion’ is shown, the following activities are affected:- Zero setting can not be performed.- Zero-tracking can not be performed.- Taring can not be obtained (applies if ‘Motion check’ is ‘On’).- Printout of weights is delayed until stable weight is obtained(applies if ‘Motion check’ is ‘On’).5-7