Hamilton ATI 2H Manuals

AIR TECHNIQUES INTERNATIONAL A Division of Hamilton Associates, Inc. 11403 Cronridge Drive  Owings Mills, MD 21117-2247 USA Tel 410.363.9696  Fax 410.363.9695 http://www.atitest.com 2H AMPLIFIER LINEARITY CHECK U S I N G A P I C O A M P E R E S O U R C E Page 1 of 2 PCL-103-WI Rev B 19-July-2011 Use only the equipment specified: Keithley 6220 picoampere current source NOTE: The following procedure is intended for ATI-2H units that have previously had Internal Reference values stored in battery-backed RAM. Procedure: 1. Be sure that both the picoampere source and the 2H unit are powered down. 2. Switch on the picoampere source. Ensure the blue output LED indicates an OFF (disabled) state. 3. Switch on the power to the 2H unit. The unit will briefly sound an audible tone, display the software version and start scanning. 4. The LED on the “REF” button should start blinking. 5. Press the “ENTER” button and the stored Reference reagent value (DOP, PAO, User or High) will be displayed on the %Leakage display. Use the or key to change the selection to PAO. 6. Press the “ENTER” button again and “100” will be displayed on the %Leakage display. 7. Press the “ENTER” button again. After scanning the LED over the “0” key should begin flashing. 8. Press “ENTER” button again. The 2H unit will scan for approximately 10 seconds and display all zeros on the %Leakage display. 9. Disconnect phototube signal from signal connector labeled J2 on the 2H unit main PCBA and connect the output of the picoampere source to J2. 10. Set the picoampere source to -08.000 µA (-0.80 X 10-5 amperes) and enable the signal output. 11. Press the “100” key and the “ENTER” button sequentially. The unit will begin scanning. When complete, the LED over the “0” key will begin flashing. 12. Disable the picoampere source signal output. 13. Press “ENTER” button on the 2H. The 2H unit will start scanning. When complete, the 2H % Leakage display should show “0.0000” and an audible tone will sound. 14. Enable the picoampere source signal output. 15. The 2H % Leakage display should show “100.00”. (Tolerance: -0.80 ± .02 x 10-5 amperes). Record the picoampere source reading on the calibration report of the UUT. NOTE: Leave the picoampere source output enabled for the following steps until instructed otherwise.