Relay Testing
CRMS
Contact Resistance Measurement System
Measure contact resistance in vital signal relays with a system combining the Contact Resistance Measurement Unit (CRMU), a configurable Multiple Relay Test Rack, and an interconnect cable.
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Capabilities
- Measures one front/heel or back/heel contact set at a time
- Four-wire Kelvin measurement with a controlled 1 A test current
- Front-panel meter displays resistance in milliohms
- Rotary contact selector with red/open and green/closed LED indications
- AC and variable DC outputs provide relay-coil energy through the test rack
- Rack supports B1, B2, PN-150, and PN-250 relay panels
- Configure coils in series, parallel, or single-coil arrangements
- Sliding support panel stabilizes the rack when a relay is installed
- External relay-tester connections support additional pickup, drop-away, and timing tests
- Optional rack carrying case, B1 connectivity accessory kit, and shelf-relay cable
Technical details
| Measurement method | Four-wire Kelvin |
|---|---|
| Contact test current | 1 A |
| Resistance display | Milliohms |
| CRMU part number | 16574-00 |
| Rack assembly | 16575-00 |
| Rack dimensions (W × D × H) | 10.125 × 10.125 × 10.8 in |
| B1 panel | 16601-01 |
| B2 panel | 16603-01 |
| PN-150 panel | 16605-01 |
| PN-250 panel | 16607-01 |
| Blank filler panel | 16679-01 |
| Rack configuration | Four sides, using relay panels and blank fillers as needed |
| CRMU-to-rack cable | 16623-01 |
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