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:
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
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
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.
On request, our existing products can be adapted to your specific requirements: Adapted protocole RS232, other testing voltage or measuring current, integration, processing software...
Two switching units (INT 17 and INT 17 HT for high testing voltage) are also available in option to interface the devices under test (initiators, airbags…) with IND pyrotechnical ohmmeters / megohmmeters. The contact switches are usually monitored by shared automation (0 24 V) and earth bounding control (contact or transistor). Automation inputs are protected against any change of polarity.
High speed parallel soak dual inflator or dual test station electrical seek
Multicontact / switch dry circuit continuity and leakage resistance measurements
Automotive power / fuse center continuity and leakage characterization
PCB / PWB and general purpose short/open circuits testing
Our technical staff can support you:
Commissioning of your equipment
Management of units evolution (number and functional needs)
On site breakdown servicing
Unit integration on test bench
On site investigation of any measurement issues
Yearly calibration is highly recommended in order to control the safety functions of your equipment.
0 to 15 Ω
Number of channels
1 or 2
0 MΩ to 100 MΩ
± 1% from 0 to 50 MΩ ± 2% from 50 to 100 MΩ
10 mA (Further current on request)
45 V (Further voltage on request)
< 2 s
- By keyboard with locking of parameters by key - By serial link
Line offset correction
By measurement of line value with validation
- 24 V at 5 mA – Programmable on opening or closing - Dry contacts in option
Dry contacts – NO or NC, programmable for: ohmmeter channel and megohmmeter channel measurement, end of cycle
- Counter: Measurement OK - Counter: Measurement out of tolerance - Counter: Measurement out of range - Counter: Measurement total
1 channel box: 280 x 155 x 290 mm 2-to-4 channel box: 480 x 170 x 300 mm
Backlit LCD display, 2 lines with 20 characters each Front panel LED showing: - Flashing green: measurement underway - Fixed green: measurement OK - Fixed red: measurement out of tolerance or out of range
AOIP offers a complete range of services: technical assistance and advice, calibration and verification by the SOFIA laboratory, equipment repair, maintenance, assistance and metrological monitoring, equipment rental, training, installation and commissioning of your equipment. More informations