Theory of operation
Probe tips. The
probe tips a re automatically detected and displayed in the Probe
Setup s creen.
Figure 2: P7700 Series TriMode active probe tips
1. TekFlex solder-in tips. These tips use flex circuit material and provide
soldered, m ulti-point connections. They support full TriMode measurement
capabili
ties and full probe bandwidth. If care is taken during the soldering
process, these probe tips can be reused through multiple soldering operations.
The small size and low cost design are good for high interconnect density
measurements.
The first time the probe tip is detected, S-parameter data for the probe tip is
sent to the oscilloscope, and probe-tip specificDSPfilters are generated. These
filters improve the measurement accuracy of high-frequency measurements.
2. P77STCABL. This optional tip provides a soldered, multi-point connection
that supports full TriMode measurement capabilities at full probe bandwidth.
If care is taken during the soldering process, this p robe tip can b e reused
thro
ugh multiple soldering operations. In some applications the robust
mechanical design of the tip and flexible cable construction provides better
usability, compared to the lower cost flex circuit tips. The first time the probe
tip is detected, S-parameter data for the probe tip is sent to the oscilloscope,
and probe-tip specificDSPfilters are generated.
3. P77BRWSR. The optional browser connects to the circuit using two input
contacts with very fine point tips. These tips have built-in compliance 0.02 in
(0.5 mm) and adjustable spacing 0.008 in to 0.210 in (0.2 mm – 5.3 mm).
T
he input contacts include an embedded damping resistor for optimum
measurement performance.
The browser tip can be held in place or can b e used to make hands-free
connections to the DUT when using the Browser Tri-Pod accessory, or a probe
positioner, such as the Tektronix PPM203B. The browser includes multiple
sets of S-parameters based on the spacing of the tips. The spacing is monitored
and the corre ct set of S-parameters are automatically used.
4 P7700 Series TriMode Probes Technical Reference
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