Output

There are 5 outputs available on the analog computer, while 4 of them can be used as inputs also except TRIG.

TRIG

TRIG is used to switch to an oscilloscope and has the ModeOP (operation) signal connected. The signal is 5V TTL logic and the low level indicates operation while the high level indicates halted or initial. The polarity of the TRIG signal can be changed with additional jumper J14 in case needed (not assembled by default).

In REP or REPF mode the TRIG signal can be used to trigger the regular repeated operation to show a more or less steady curve (depending on OP TIME) on a classic analog oscilloscope.

X/Y

The X and Y signal are used for connecting a real 2 channel oscilloscope or even a soundcard oscilloscope. For the soundcard support the +/-10V level is reduced by factor 10 to +/-1V. This outputs are not active and have an impedance of about a few kOhm and match approx. to the line input of a soundcard. The voltage level may not be very exact in this case. Using a classic oscilloscope with 1M or 10M input resistance the output voltage has an accuracy of about 99% of the 1V voltage level. The signals must be feeded into the corresponding OUT sockets in the front panel using patch cables. The section is marked coloured in the picture. X and Y can be used as input signals as well, see comments on Z/U signals.

Z/U

Z and U are additional outputs with the same characteristics of X and Y but can be used additional as input signals. Take care, that the input impedance is 560R and need a buffered output able to drive it without loss. Input signals can be up to +/-10V. If input signals with only +/-1V are available, it is possible to use the corresponding 10x inputs for summers or integrators which allows a scale by factor 10 to +/-10V easily. The Z output and U output can also be used to display up to 4 signals at the same time on a 4-channel oscilloscope. The voltage at the U socket is automatically connected to the voltmeter in parallel to observe low changing signals with the inbuild display. It may flicker or show useless information for fast changing signals (2-3 measures per second).