Huntron: Huntron Access DH2 Prober

Access DH2 Dual Head Prober with Tracker and Controller


Huntron® Access DH2 Prober

Dual Head, Open Architecture Probing Station

The Access DH2 Prober is a dual head Robotic Flying Probe system that is best suited for low volume PCA testing where interfacing between two points is necessary. The Access DH2 stands in it’s own cabinet with plenty of space underneath for a rack mounted PC and other test instrumentation. The open architecture design of the Access DH2 makes it possible for you to utilize flying probe technology with many different test methods where automated probing of the PCA under test makes sense. The Access DH2 can be used with traditional Huntron Tracker products, configured to work with many conventional test instruments. The Access DH2 design allows a plug and play approach to automating manual guided probe applications.

• Cost effective, open architecture robotic platform
• Design, manufacturing and service depot applications
• Increase operator productivity
• Repeatable, accurate X, Y and Z movement
• Easy access to probing area


• Dual head flying probe interface for true point-to-point testing
• Sized for small to large PCAs
• Exceptional accuracy for precise probing of PCAs
• Internal Huntron Tracker and rack mounted Computer included (Contact Huntron for current PC configuration)
• RG316 coax cable to the probes used for high frequency measurements
• Configured for 4 wire resistance testing when used with the optional 4 Wire Test Kit (kit includes 4 wire probe holders, cable adapters and meter mounting hardware)
• Durable, stand alone cabinet design for many years of service
• Built-in side by side 19″ racks provide plenty of space for PC and integrated test instrumentation
• Automate tests using other mainline test instruments with optional SDK packages

Tech Specs

Number of Test Heads 2
Maximum Board Under Test Size 27″ x 23″ (68.6cm x 58cm)
Maximum Probing Area 19″ x 12″ (48.3cm x 30.5cm)
Maximum Board Component Height 4.8″ (12.2cm)
Dimensions 47” W x 61.5” H x 35.75” D (w/handle) (119.4cm W x 156.2cm H x 90.8cm D)
Cabinet Internal Dimensions 45″ W x 29″ H x 33″ D (114.3cm W x 73.6cm H x 83.8cm D)
Accuracy and Resolution 0.0003937″ (±10 microns) for Top Slot (6″ above plate) at 0.00002″ (0.4 microns)


Included Accessory Part Number

Huntron Workstation CD Part number 06-5228
Manual on CD Part number 06-5217
Huntron Microprobes – MP10 (supplied with Access with Tracker) Part number 98-0078
4 Common leads Part number 98-0043
Common Lead with Ferrite Bead (EMI reduction) Part number 98-0227
Power cord Part number 98-0722
Slot Level Block Part number 98-0750
Tool Kit Part number 98-0452
Rotating Board Holder Kit Part number 98-0723
Probe Kit Part number 98-0718
Video Microscope Part number 98-0693
LCD Monitor Part number 98-0581
Monitor Arm Part number 98-0705

Optional Accessory Part Number

4 Wire test kit for Keysight 34410A or 34461A (DMM not included) Part number 98-0755
4 Wire test kit for B&K Precision 2841 (meter not included) Part number 98-0767


Q: What are the differences between the original Access DH Prober and the Access DH2?

Answer: The Access DH2 is a refinement of the original Access DH. Functionally the original Access DH and the Access DH2 are virtually identical.
The most significant difference is the size. The Access DH2 is wider but not as deep as the Access DH and will fit through a 36″ door. Another important difference is that shielded, high frequency coax cables are used to connect to the probe tips. This allows for broader possibilities when using the Access DH2 to measure high frequency signals. There is also better access from the base cabinet to the probing area and more instrumentation space in the base cabinet. Ring lights have been added to the vision system which features higher resolution, auto-focus cameras.
Plus the DH2 is a different color. 🙂

Q: What are the primary differences between the single head Access Probers and the dual head Access DH2?

Answer: The Access DH2 allows you to probe between two specific points whereas the single head prober requires a common connection used for the “return” line. The Access DH2 was designed as an open architecture system where the user can setup testing processes of their own design. The Access DH2 is built on its own cabinet with space underneath for additional test equipment.

Q: What types of test hardware can be connected to an Access DH2 Prober?

Answer: The Huntron Workstation software supports Huntron Trackers (Tracker 3200S and Tracker Model 30) and selected conventional test instruments (see the Workstation Software page for a list). Other test instrumentation can be connected to an Access DH2 Prober and controlled using Huntron Remote Control or custom applications developed using the Hardware SDK.

Q: How is the Access DH2 used with 4 wire resistance testing?

Answer: The Access DH2 comes from the factory pre-wired for 4 Wire resistance testing. When the optional 4 Wire Test Kit is added you can use the Keysight 34410A DMM, Keysight 34461A DMM or the B&K Precision 2841 DC Resistance Meter to make automated 4 Wire tests. You can accurately measure very low resistances including milli-ohm and micro-ohm values (B&K Precision 2841). 4 wire resistance testing enables you to check PCB trace integrity, measure contact resistance and locate PCB short circuits.

Q: How fast is the Access DH2 Prober?

Answer: The probing speed depends on how the Prober is being used. If it is being used to take measurements, the speed in affected by how long it takes to capture the measurement. In general, you will be able to probe one point approximately every two seconds.

Q: How accurate is the Access DH2 Prober and how close can the probes get to each other?

Answer: The Huntron Access DH2 is very accurate. The minimum step resolution is 0.4 microns with an accuracy of +/- 20 microns. This is more than accurate enough to probe very small lead spaced devices such as the 0.4mm surface mounted ICs. Currently, the minimum spacing between the two probes is 0.05″ (1.27mm) when 50mil probe holders are installed.

Q: Can I use CAD data to develop a test routine?

Answer: Yes. Optional software is available to assist you in using your CAD data to create tests in Huntron Workstation. You can find more details by visiting the Workstation Software page (click the “CAD Tools” tab).

Additional information


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