The internal plate holds the spring loaded test pins and presses them against the board under test when the handle is pulled. This view with the bottom panel removed shows the easy accessibility provided in our fixture designs. On first glance these fixtures may appear as a wiring rats nest. These larger wires are just a few high current carrying wires that must be routed as direct as possible and away from the signal lines. On closer inspection you will notice that there are circuit boards behind the front panel meters, LEDs, and switches, and circuit boards also back the rear panel connectors.
Ribbon cable is used whenever possible.
An internal power supply powers the board under test. Low speed signal and data pins are wire wrapped to the appropriate rear panel connectors where they are cabled out to an insrument board. Higher speed signals, and noise sensitive signals are wired with twisted pairs or coaxial cable. All wiring is neatly bundled for easy troubleshooting and modification. Extreme care is taken in the manufacture of all plates.