Steps

1. Laptop display is probably in sleep. Turn it on by touching the mousepad.

2. Check if the code is running (the time display box, top left corner) should be changing. If it's not changing, code has frozen.

3. Note the value under the "Rate" box. This is the value you need to use for the DC subtraction of the angle for the high-pass filter. (if it is changing a lot, use an average over one cycle ~2 minutes)

4. Close the program window.

5. Change the DC subtraction value to the one obtained above. There is a comment next to it's location. If you have trouble finding it, using search function should also get you there.

6. About 5-10 lines below this line, the four values being written to the DAC card are defined. There should be comments next to them describing their values. The fourth value is the control signal for the damper.

7. Next to its real definition, there is a commented line declaring it to be a constant value of 2.5 Volts. Uncomment this line.

8. Run the code. The control signal is now fixed to 2.5V. 

9. Walk up to the BRS box and open the front panel (facing West, towards the nearest wall).

10. When the control signal is constant, you can change the position of the turn table by just moving it by hand. Ensure that the position of the turn-table is at 45 degrees to the beam axis. I.e, looking from the top, it should be:

    (Mass 1)
												E
-------------------------------------BRS vacuum can-----------------------------------         N-S (X-axis)
												W
			(Mass 2)								



11. Close up the BRS box and return to the laptop.

12. Comment the line assigning 2.5 to the control signal and restart the code.

13. If the BRS is rung up to more than 2000 counts, you may need to do the "gravity dance" to damp it faster. Also, check that the DC subtraction value is still appropriate by comparing it to the "Rate" box on screen.