I've done that when verifying TD functionality while troubleshooting some time-bases. Ozan suggested how to do it and it works very well. Sort of gratifying to watch that jump when the TD fires.
Barry - N4BUQ
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----- Original Message -----
From: "Albert Otten" <aodiversen@...>
If you want to check the TD that way, it's save in my opinion. Suppose you have
a variable DC power supply 0-15 V.Then with a 560 ohm resistor the supply can
source some more than 21 mA to the TD, but not excessive. First reliably
connect DC minus to 284 GND. Then a lead to DC plus and at the end of the lead
the resistor. Now you can touch the inner connector of the GR output with the
free resistor end. But grep the resistor only at the DC end, not the GR end.
To see what happens you can put an ammeter in series with the lead and a
voltmeter across the GR connector. Crank up the DC voltage slowly until the TD
fires.
