Digital megohmmeter IND 45

bench-topfor pyrotechnic devices4-wire

This safety ohmmeter / megohmmeter was developed to carry continuity and isolation measurements on pyrotechnical elements where user safety is at stake. Two types of conditions define the user safety: Measurement conditions: - Measuring current much lower than the current of non-fire - Connection to the test line only for the activated period of measurement - Discharge of residual electrical charges Safety conditions: - No overshoot of maximum current even in case of instrument failure (electronics breakdown, internal short-circuit…) - Permanent self-checking of the instrument internal functions before connection to measurement channel Measurement principle The ohmmeter function is based on 4 wire measurement, which makes it possible to be freed from parasitic line resistance. The principle relies on an internal device of permanent self-calibration which guarantees, over a short and long-term period of time, the high reliability of the measurements carried out by continuously correcting the drifts of gain and offset. Measurements start with an external input signal. The result of the measurement is internally processed to supply information whether the measured value is within tolerance limits set by the operator. All parameter settings are entered by keyboard with a locking of the parameters by key. Our units are equipped with dry contact output and S232 connection that allows process automation and implementation of traceability.