Resistance testing engineers have developed a series of models over the years with each of them having certain modes of operation. The chronicle of the development of these testing models throughout the years reveals the several modes of operation per the equipment in the different eras.
The 70’s and 80’s Models
Continuous Mode: This mode is meant for field based work and generally connects with helical spring-point lead sets. This mode is used for measurement of resistance when the current probes are connected to the test specimen. The life of battery is lengthened since current flows only during the performance of tests.
Momentary Mode: In this mode, the potential leads and the current leads are separate. These leads are separately attached to the test specimen, and measurements are recorded when the switch is turned to the momentary mode.
The Recent 10 Amp Models
Normal Mode: This mode functions when connecting the set of 4 test leads to the specimen, and the machine generated results can be obtained. There is self-adjustment and checking from applying the forward and reverse currents to the test specimen, and the results are short-termed, maximum of 10 seconds.
Auto Mode: This test yields the average value of the test while adjusting the forward and reverse direction of the currents. The only difference with the above method is that it yields the result for the time the four test leads remain connected to the test equipment in hand. Each time there is re-attachment of the probes a new test begins.
Continuous Mode: As the name suggests, the results to resistance measurements are displayed continuously at fixed durations. These records start when connecting the test leads to the equipment and continue till the time the circuit is intact.
Unidirectional Mode: This mode measures resistance only when currents flow in a single direction. This process is quite fast as the concept of reverse current measurement does not hold any sense here.
The recent 100+ Amp Models
Normal Mode: When the test leads are connected to the equipment, this test mode is first used to check whether the flow of current is continuous and then, the test conditions are analyzed.
Continuous Mode: This mode reveals the test results at regular intervals from the time the leads are attached to the equipment. The resulting analysis comes to an end when the contact with the probes comes to an end.
Auto Mode: This mode requires selection of the test current first and then presses the button after attaching the leads. This test yields output for the time the current keeps running through the circuit. For the next set, the probe wires need to be disconnected and then reconnected.