Equus 3042 analyzer question

pishta · Jun 27, 2022

So I broke out my newly purchased 3042 and flipped through the instructions. I clipped the inductive pickup lead onto a running coil wire and got nothing. I checked the manual and it said the 2 C batteries were only needed for resistance testing. It did not mention power to the unit for the RPM test. Was this just an oversight or does this units tach work solely on the coil pickup? I have an inductive timing light but it has 12v power clips. Did I miss something? I believe it has all its test clips and shunts still with it.

67Dart273 · Jun 27, 2022

It may be that the batteries only operate the ohm-meter. Doesn't the "all test" port have battery clips? I bet they need to be connected. Destructions?

pishta · Jul 4, 2022

OK, I'm a 50% idiot. The destructions do refer to one pic of the +- leads (All test) clipped to the battery while reading tach function (obvious to me now) but the part that wasn't my fault was the inductive lead coaxial cable was broken under some tape that I found. I spliced them together and the tach started to function, and hovered just under 8 at idle, spec is 750. Now I just have to get a working vacuum gauge (mine broke somehow) and Ill be set. The batteries are only for the resistance (ohm) readings. I turned the idle mixture screw out 1 turn and the RPM's raised just a tad. Ill work on that later.

67Dart273 · Jul 4, 2022

Sometimes this old stuff is difficult "to tell" LOL

pishta · Dec 10, 2023

Tried it again today and the tach feature now is totally fubar. It wanders aimlessly every 4 seconds like a capacitor is charging then dropping. It looks pretty simple inside. 2 electrolytic capacitors, 4 mylar caps, 3 chips, 1 transistor and some resistors.