Access DH2 Prober FAQ
Q: What are the differences between the original Access DH Prober and the Access DH2?
A: The Access DH2 is a refinement of the original Access DH. Functionally the 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 possibilites 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?
A: 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?
A: 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?
A: 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?
A: 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?
A: 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?
A: 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).