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PAR Tester
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Overview
Most OEM environmental specifications (including Electromagnetic Compatibility - EMC):
- Do not address many contemporary issues - limited value add.
- "Cookbook" approach (always done it this way) - lots of baggage.
- Expensive and time consuming to implement.
Product Issues
The PAR tester was developed to address many of these issues:
- Details in SAE Information Report J2628, (Characterization, Conducted Immunity, July 2007).
- Based on real world issues often missed in typical Product Assurance/Validation process.
- Uses relatively simple, low cost techniques and includes many functions in one package (does not require a test laboratory environment).
- Makes it practical (fast, inexpensive) for Hardware-Software Robustness and Design Margin testing throughout the design process.
- Enables early detection of issues and a lean testing process.
- Capability to do many OEM, ISO, etc Conducted Immunity EMC tests.
- Recreates "real world" transient events (unlike the unrealistic simulations of ISO 7637).
- Creates other waveforms via a 2 channel Arbitrary Waveform Generator (AWG) and 2 channel DC power amplifier. Fast waveforms use the Electronic Switch module.
- Evaluates non ideal DUT switch signal inputs via a 4 channel switch simulator that creates random noise on switch transitions. Also simulates non ideal switch impedances.
Modular Units
The PAR tester consists of modular units packaged in a 3U 19 " rack:
1. DC Power Amplifiers:
- Power Op Amps - switching power supplies.
- 0-20 KHz, 0-24 volts.
- Channel 1 = 150 watts (e.g. Battery power)
- Channel 2 = 50 watts (e.g. Ignition signal)
2. Arbitrary Waveform Generator (AWG):
- 2 channels
- PC Controlled via USB
- Easy to use waveform editor.
3. Electronic Switch, DC voltage source
- 1us rise/fall time
- Capability = 10 amps
- Voltage Source = 1.5 - 20 volts, 1.5 amp (apply to DC amp for more power).
4. Transient Generator: Uses inductors and relays (including chattering relay) to simulate vehicle transients per SAE J2628 and Ford EMC spec.
5. Switch Noise Simulator:
- Creates random bounce at switch transitions (adjustable)
- 4 channels, separate or simultaneous activation.
- Includes non ideal switch impedances.
Contact
Bob Wiebe, (248) 353-0100, bwiebe@geltd.net.
Arnie Nielsen, (248) 305-8264, arnienielsen@comcast.net
References
SAE J2628 (2007), Characterization, Conducted Immunity. Ford EMC Spec ES-XW7T-1A278-AC (www.fordemc.com)
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