Keysight Technologies InfiniiMax III Series, Руководство пользователя

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2. InfiniiMax III Probe Heads
N5439A InfiniiMax III ZIF (Zero Insertion Force) Probe Head
Using the ZIF Probe Tips
There are three different models of ZIF probe tips:
• N2838A 25 GHz PC board ZIF tips.
Variable spacing from 5 mil – 250 mil (or 0.127 mm – 6.35 mm).
NOTE The specifications and performance plots of the N2838A ZIF tip were measured with
a nominal spacing of 40 mil (1 mm).
In order to achieve the proper response (as shown in the performace plots), you need
to keep the mini-axial lead bodies roughly parallel and use the tip wires on the
mini-axial leads to get the desired span.
If you need to position the mini-axial lead resistor bodies different than this (that is,
resistor bodies close together or spread way apart), use Precision Probe to perform
an AC calibration of the probe; the AC calibration will capture the response properly.
Increasing the spacing to 250 mil will degrade the performance some, but Precision
Probe can be used to compensate or qualify the effect.
The axial resistors on N2838A ZIF tips can be replaced if they break or
become damaged. See “Replacing Axial Resistors on the N2836A
Solder-in Probe Head or N2838A ZIF Tips" on page 49.
• N5440A 28 GHz ceramic ZIF tips.
Variable spacing from 5 mil – 80 mil (or 0.127 mm – 2 mm).
• N5447A 28 Ghz ceramic high sensitivity ZIF tips.
Variable spacing from 5 mil – 80 mil (or 0.127 mm – 2 mm).
To tell these two models apart from each other, look at the gold pattern
etched on each of the tips (see Figure 19 which follows).