new lagged value = (1 -) * previous lagged value + (
Meter-lag-time attribute of the Timing Parameters system table. You can change this attribute at any time; the change takes effect immediately. G2-meters monitor events in time. G2-meters can compute values for the most recent clock-tick, or they can compute values based on a smoothed result of recent clock-ticks. Such values are called lagged values, because they do not vary as drastically as the instantaneous events they measure. Rather, they represent a first-order delayed reaction to the event. The time interval over which a G2-meter smooths values is called the meter lag time.
To clarify this, it may be helpful to think of meter lag time as it exists on the dashboard of a car. For example, the fuel gauge in a car has a large meter lag time, because you don't want the needle on the fuel gauge to swing wildly as the gasoline sloshes in your fuel tank. Conversely, the speedometer has a small meter lag time, because you want it to respond immediately as the car goes faster and slower.
G2 computes lagged values as follows:
new lagged value = (1 -
The
Meter-lag-time attribute of the Timing Parameters system table holds a value of 0 seconds or any longer time interval. If it holds 0 seconds, G2-meters reflect only the activity in the most recently completed clock tick. As its value increases, the values of G2-meters change more smoothly over time. 
To set the meter lag time:
Edit the Meter-lag-time attribute of the Timing Parameters system table to specify the desired value.