Limiting translation for consistent substrate-to-substrate contact

1. A method of testing integrated circuits of devices, comprising:

holding the first device against a surface of a holder;

moving a contactor board assembly relative to the holder to bring terminals of the contactor board assembly into contact with contacts on the first device;

allowing air through a fluid line to modify a size of a volume defined between the first and second portions of the actuator, thereby actuating first and second portions of an actuator to move a contactor support structure relative to an apparatus frame and urge terminals on the contactor support structure against contacts on the first device;

providing signals through the terminals and contacts to an integrated circuit of the first device;

reducing a pressure in the internal volume while maintaining the terminals in contact with the contacts;

moving the holder relative to the apparatus frame to disengage the terminals from the contacts while maintaining the first and second components of the actuator in a substantially stationary relationship with one another;

replacing the first device with a second device by removing the first device from the holder and holding the second device against the surface of the holder;

moving the holder relative to the frame to bring the terminals into contact with contacts of the second device while the first and second components of the actuator remain substantially in the stationary relationship relative to one another;

increasing the pressure in the volume to urge the terminals against the contacts on the second device; and

providing signals through the terminals and the contacts of the second device to an integrated circuit of the second device.

2. The method of claim 1 , further comprising:

closing an isolation valve while the first and second components are in the stationary relationship to isolate the internal volume; and

opening the isolation valve before increasing the pressure in the volume to urge the terminals against the contacts on the second device.

3. The method of claim 2 , wherein the terminals make contact with the contacts of the second device before and after closing the isolation valve.

4. The method of claim 1 , wherein the first and second portions of the actuator are a cylinder and a piston, respectively, the piston being located in the cylinder so that the cylinder and the piston jointly define the volume, further comprising:

modifying a pressure of the volume and move the piston relative to the cylinder.

5. The method of claim 4 , further comprising:

adjusting the force of at least one spring that connects the piston to the cylinder to level the piston relative to the cylinder.

6. The method of claim 1 , wherein the actuator includes inflatable and deflatable bladder, the first and second portions of the actuator being opposing sides of the bladder.

7. The method of claim 1 , wherein the contactor support structure includes a distribution board substrate and a contactor substrate mounted to the distribution board substrate.

8. The method of claim 1 , further comprising:

removably mounting a cartridge frame of a cartridge to the apparatus frame, the contactor board assembly forming part of the cartridge; and

connecting a surface of a connector interface to a surface of a contactor interface.

9. The method of claim 8 , wherein the cartridge includes a common subassembly and a first unique contactor subassembly, further comprising:

replacing the first unique contactor subassembly with a second unique contactor subassembly.

10. The method of claim 9 , further comprising:

reducing a pressure in an area between the common subassembly and the second unique contactor subassembly.

11. An apparatus for testing integrated circuits of devices, comprising:

an apparatus frame;

a holder for the first device, secured to the apparatus frame;

a contactor support structure;

a plurality of terminals held by the contactor support structure;

an actuator connected between the apparatus frame and the contactor support structure, having first and second portions that are movable relative to one another and a volume defined between the first and second portions and a fluid line connected to the volume to allow air through the volume and thereby modify a size of the volume and move the contactor support structure relative to the apparatus frame to move the contactor support structure relative to the apparatus frame and toward the surface of the holder so that the terminals are urged against contacts of the first device;

a fluid line connected to the volume to allow air through the volume and thereby modify a size of the volume and move the contactor support structure relative to the apparatus frame toward the holder so that the terminals are urged against contacts of the first device;

a power source;

a power electrical path connecting the power source to a power terminal of the terminals held by the support structure;

a signal source;

a plurality of signal electrical paths, each connecting the signal source to a respective signal terminal of the terminals held by the support structure;

a processor;

a memory connected to the processor; and

a computer program stored in the memory and executable by the processor to carry out a method comprising:

reducing a pressure in the internal volume while maintaining the terminals in contact with the contacts;

moving the holder relative to the apparatus frame to disengage the terminals from the contacts while maintaining the first and second components of the actuator in a substantially stationary relationship with one another;

replacing the first device with a second device by removing the first device from the holder and holding the second device against the surface of the holder;

moving the holder relative to the frame to bring the terminals into contact with contacts of the second device while the first and second components of the actuator remain substantially in the stationary relationship relative to one another;

increasing the pressure in the volume to urge the terminals against the contacts on the second device; and

providing signals through the terminals and the contacts of the second device to an integrated circuit of the second device.

12. The apparatus of claim 11 , further comprising:

closing an isolation valve while the first and second components are in the stationary relationship to isolate the internal volume; and

opening the isolation valve before increasing the pressure in the volume to urge the terminals against the contacts on the second device.

13. The apparatus of claim 12 , wherein the terminals make contact with the contacts of the second device before and after closing the isolation valve.

14. The apparatus of claim 11 , wherein the first and second portions of the actuator are a cylinder and a piston, respectively, the piston being located in the cylinder so that the cylinder and the piston jointly define a volume, further comprising, the fluid line being connected to the volume to modify a pressure of the volume and move the piston relative to the cylinder.

15. The apparatus of claim 14 , further comprising:

a spring; and

a spring adjustment mechanism having a first portion secured to the piston and a second portion connected to the spring, the spring adjustment mechanism being adjustable to adjust a force of the spring and level the piston relative to the cylinder.

16. The apparatus of claim 11 , wherein the actuator includes inflatable and deflatable bladder, the first and second portions of the actuator being opposing sides of the bladder.

17. The apparatus of claim 11 , wherein the contactor support structure includes a distribution board substrate and a contactor substrate mounted to the distribution board substrate.

18. The apparatus of claim 11 , further comprising:

a cartridge including a cartridge frame that is removably mountable to the apparatus frame, the contactor board forming part of the cartridge;

a contactor interface on the contactor support structure; and

a connector interface having a surface for connecting to a surface of the contactor interface.

19. The apparatus of claim 18 , wherein the cartridge includes a common subassembly and a first unique contactor subassembly that is replaceable with a second unique contactor subassembly.

20. The apparatus of claim 19 , further comprising:

a pressure reduction passage in communication with an area between the common subassembly and the second unique contactor subassembly and having an outlet on an external side of the cartridge; and

a pump connected to the outlet of the pressure reduction passage so as to reduce a pressure in the area between the common subassembly and the second unique contactor subassembly.