HP 03495‑66507 is an extender/interface card for the HP 3495A Scanner/Multiplexer system.

- 44‑pin dual‑sided gold edge 

- Cinch 251‑22‑30‑380 mating connector 

- 152×91 mm board size 

- Heavy gold traces (HP used thick gold for low‑level analog switching) 

- No components, just routing 

- Part‑number prefix 03495 → HP 3495A family 

 

It is a service extender for HP’s switching/DAQ hardware, specifically the 3495A family.

Technicians used it to:

- Pull a switching module out of the 3495A frame 

- Probe reed relay matrices

- Debug analog crosspoints 

- Access the digital control bus 

- Measure leakage, contact resistance, and channel switching behavior 

The wide gold traces are there to maintain microvolt‑level integrity during analog switching tests.