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Rev 1.2 AD6000 System Operating Manual 62 like dispenses by selecting “All dispensers of this type” from the “Act on” pull down menu. Different dispenser may also aspirate different amounts by “or delayed and triggered if different volumes will be dispensed. The iterate tab allows the user to incrementally change the volume aspirated in a program that uses a Loop command. This is helpful if the amount of sample being dispensed is changing also. The larger the dispense, then the amount aspirated would be larger. Enabling the reset, is much like enabling the reset of a move command, in that after a given number of passes the user would like to have the initial volume aspirated and the iterate would start over again. If for some reason the user would like for the amount aspirated to reset to a value other than the initial value then the “To initial value” box should be unchecked and the amount to reset to should be entered manually. The “Vent” is also programmed in the aspirate tab. To vent, the user should insert the aspirate command into the program with an aspirate volume of 0.000 (uL) and a delay of 1000 (mS). 14.4.6. Dispense The “Dispense” instruction appears as a water faucet in the toolbar. There is three profile tabs to edit in this command: Dispense, Iterations, and Notes. The dispense instruction controls the drawing up of solution into the lines for dispensing. It also allows the operator to select what channel(s) (BiojetQuanti 1 (channel 1)-8 to dispense. There are four choices in the “Act on” pull down menu. The first is “selected channel”. This is used for dispensing a specific channel. The second is “All dispensers of this type”. All channels may be operated simultaneously for like dispenses by selecting this command.