Electronics International SR-8A - Manual (Page 20)

When measuring from one lead (either lead) of the probe to the probe sheath (metal tip), there should be
an “open” (10k or greater).
2. Another method of checking a probe is to plug the suspected bad probe into a channel that is working
properly. If the problem follows the probe, you have a defective probe.
C. Extension Cable Check Out:
With the Extension Cable connected to the Smart Analyzer, remove the probe from the suspected bad
Extension Cable. Set the Smart Analyzer to the proper channel and look for a near cabin temperature reading
on the Smart Analyzer. A very high or low reading indicates a short to ground in the cable. Next, connect an
ohmmeter, set to 10K range, to the open probe ends of the suspected bad Extension Cable. Set the Smart
Analyzer to the proper channel and look for a very high (+ or -) reading. A near cabin temperature reading
or no change in reading indicates an open in the cable or its connectors. Also, look for a reading on the
ohmmeter around 12K ohms. Most problems of this kind are usually one of the following:
1. Poor Connections: When plugging the probe into the extension cable it is possible to get the tab on
the male connector to wedge between the red nylon and metal receptacle in the female connector. This
connection may work for a few weeks or even months and then you will start to see jumpy readings.
Disturbing the connection, without actually fixing it, will get it to work for a short time and then the
problem will reappear. Physically check your connections at the probe for a proper mate.
2. Loose Connections: The female slip-on connector between the Extension cable and probe can
become loose if the connector has been used many times. This loose connection may work for a few
weeks or even months and then you will start to see jumpy readings. A good connection is difficult to
pull apart. If your connector is loose it can be tightened using a pair of needle nose pliers. Check your
connectors at the probe for a good tight connection.
3. Poor Crimp: This is usually only a problem if you have removed the connectors and replaced them.
This connection may work for a few weeks or even months and then you will start to see jumpy read-
ings. To check a crimp, give a sharp pull on the wire and connector. The wire should be tight in the
crimp (no movement). When putting a new connector on a wire, double the wire over and put two tight
crimps on the connector.
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Troubleshooting Suggestions B. Probe Check Out: