The following circuit may be used to test the AS1 black box.
Today (5/12/2005) I tried my idea of feeding the black box with a small voltage. I used a nominal 1.5 V battery in series with a 1 ohm and a 100 kohm resistor. I attached wires across the 1 ohm resistor and attached them to the black box in place of the AS1 sensor. This should give a voltage of 15 microvolts. However I measured the battery voltage as 1.36 V and the resistors as 1.6 ohm and 92.4 kohm. This works out to 24 microvolts. My meter doesn't work at that low a level, so I couldn't measure it directly.
The calibration procedure is:
 | Detach the AS1 wires and attach the 1 ohm resistor across the black box |
| Wait 60 seconds |
| Attach the battery and the 100 k ohm resistor, as shown, to generate the first pulse |
| Wait 60 seconds |
| Detach the battery and the 100 k ohms to generate the second pulse |
| Wait 60 seconds |
| Remove the 1 ohm resistor and re attach the AS1 sensor again. |
Here's what the signal looked like when I applied and then removed this small voltage:
