Waveguide Arc Detectors

 

Atm's series of Arc Detectors are opto-electric devices which detect visible arcs in high-power microwave waveguides.  They are normally mounted between the output flange of the microwave source and the transmission line in a 90 degree E-plane bend configuration. Other configurations may be manufactured upon special request. ATM offers Arc Detectors in waveguide sizes ranging from WR28 - WR284.  Please call us and discuss your needs with one of our design engineers. Below is a how our standard model operates electrically: In the base model of ATM's Arc Detector, +15 VDC at 25mA is applied to pin A to arm the device.  When armed, the arc detector will develop TTL 1 (2.4 - 5.0 volts, 3.5 volts typical) on the output, Pin D.  In response to a visible arc in the waveguide facing the detector device (input flange 1), Pin D will have an output of TTL 0 ( 0-0.8 volts ).  Pin D will remain at this level until the arc in the waveguide is no longer present.  The Arc will automatically re-arm when the waveguide is no longer illuminated. Pins E and F (case ground) are ground connections.

GENERAL SPECIFICATIONS (STANDARD OPTION) Input Power: 15+ VDC at 25mA Pressure Sealed to: 30 PSI Output Voltage: Armed: TTL 1 (2.4 - 5.0 volts, 3.5 volts typical) Fault/Fired: TTL 0 (0 - 0.8 volts) Response Time: less than 10 µsec.

Arc Detector Options: A - Input Voltage:  Input voltage at Pin A is +28VDC at 40 mA, Output voltage TTL 1(2.4 - 5.0 volts, 3.5 volts typical) B - Latching Reset Capability (+5VDC):  After being triggered by an arc, the output will remain at less than one volt until the Arc Detector is manually reset.  This is accomplished by bringing Pin C to +5VDC (TTL) momentarily, then returned to case ground.   BB - Latching Reset Capability (Open Circuit):  After being triggered by an arc, the output will remain at less than one volt until the Arc Detector is manually reset.  This is accomplished by removing pin C from case ground to an "open circuit" momentarily, then returned to case ground.   C - Self test:  To test the Arc Detector's triggering/latching ability, +5 VDC is applied to pin B.  Current required is 20mA D - Output Voltage   Output voltage is +15 VDC.  This option requires choosing option A, +28 VDC input,  The fired voltage is less than 1 volt.   Note: For any of the options shown above add the appropriate letter to the end of the model number.  It is possible to add more than one option. Example P/N:  137-ARCE-A-2-2 becomes: 137-ARCE-A-2-2/AB when options A & B are desired.