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Keysight N2887A and N2888A
InfiniiMax Soft Touch Probe Head
Data Sheet




N2887A InfiniiMax Soft touch Pro probe head N2888A Infiniimax Soft touch half-channel probe head
Introduction

Keysight Technologies, Inc. has developed connectorless logic analyzer probes based on Soft touch
probing technology. Connectorless logic analyzer probing removes the connector that is traditionally
attached to the target board and replaces it with an array of probe pods. This reduces the probe load
on the target by eliminating the loading associated with the physical body of the connector.

The N2887A and N2888A InfiniiMax Soft touch probe heads adapt from the Keysight Pro Series
(N2887A) or Half-channel (N2888A) Soft Touch Connectorless Logic Analyzer foot print to the GPO
input connectors of the Keysight InfiniiMax 1130A-1134A and 1168A-1169A Series probe amplifier,
enabling users to perform high bandwidth (up to 4 GHz), high density, multi-channel probing.
The InfiniiMax Soft touch probe heads offer significant benefits in reliability, ease-of-use and space
savings provided by the Soft touch probing technology and the award-winning InfiniiMax active
probes. Each adapter can support both the Soft Touch single-ended and differential footprints and
pin-outs. The support of both single-ended and differential signals is achieved by either plugging a
single-ended channel (one connector) into the "+" input of the InfiniiMax amplifier or by plugging
the differential complements (2 connectors) into the appropriate "+" and "-" inputs of the InfiniiMax
amplifier. There exists a 1:1 mapping of Soft-touch signal and clock lines to InfiniiMax amplifier input
GPO connectors--a total of 36 or 18 GPO connectors is necessary to support the possible
configurations for N2887A and N2888A respectively.

The probe adapter attaches to the PC board using a retention module which ensures pin-to-pad
alignment and holds the probe in place. A kit of five retention modules is shipped with each InfiniiMax
Soft touch probe head. Additional kits can be ordered using Keysight part numbers, E5405-68702 for
Soft touch Pro probe head and E5396-68702 for Soft touch Half-channel probe head.

Refer to the "Keysight Technologies E5400-Pro Series Soft Touch Connectorless Probes" user's guide
with the Keysight literature number E5404-97006 for details of the Pro Series and Half-channel
pin-outs, footprint dimensions, keep-out areas, et cetera.
03 | Keysight | N2887A and N2888A InfiniiMax Soft Touch Probe Head - Data Sheet




Characteristics

Bandwidth(-3dB) 4 GHz
Flatness +/- 5%
Single Ended Equivalent Load Capacitance <1 pF
Differential Equivalent Load Capacitance <0.5 pF
Single Ended Input Impedance 25 k
Differential Input Impedance 50 k
Channel to Channel Coupling <-35 dB to 1.7 GHz, <-20 dB to 4 GHz
Channel to Channel skew* <15 psec (typical)
Compatible Keysight InfiniiMax probes 1130A, 1131A, 1132A, 1134A, 1168A
and 1169A

*Use N2887-60002 deskew and performance verification fixture to eliminate timing skew
between channels.
04 | Keysight | N2887A and N2888A InfiniiMax Soft Touch Probe Head - Data Sheet




Figure 1 The N2887A InfiniiMax Soft touch Pro probe head (the InfiniiMax probe amplifier
is not included)




Figure 2 Frequency response of the N2887A, red = Single-ended, blue = Differential
05 | Keysight | N2887A and N2888A InfiniiMax Soft Touch Probe Head - Data Sheet




Figure 3 Differential Input Impedance plot, input C = ~0.72 pF




Figure 4 Time domain differential probe response, purple = input of the probe,
green = probe output, using Keysight 1169A InfiniiMax probe and
DSO81304B 13 GHz oscilloscope
06 | Keysight | N2887A and N2888A InfiniiMax Soft Touch Probe Head - Data Sheet




Figure 5 Time domain single-ended probe response, purple = input of the
probe, green = probe output, using Keysight 1169A InfiniiMax probe and
DSO81304B 13 GHz oscilloscope
07 | Keysight | N2887A and N2888A InfiniiMax Soft Touch Probe Head - Data Sheet




Figure 6 Pin assignment map of the N2887A InfiniiMax Soft touch Pro adapter




Figure 7 Pin assignment map of the N2888A InfiniiMax Soft touch half-channel adapter
08 | Keysight | N2887A and N2888A InfiniiMax Soft Touch Probe Head - Data Sheet




Ordering Information
Product number Description Notes
N2887A InfiniiMax Soft touch Pro Probe Head
N2888A InfiniiMax Soft touch Half-channel Probe Head
E5405-68702 Soft Touch Pro Retention Module Kit
E5396-68702 Soft Touch Half-channel Retention Module Kit
N2887-60002 Deskew and Performance Verification Fixture




Keysight Technologies Oscilloscopes
Multiple form factors from 20 MHz to >90 GHz | Industry leading specs | Powerful applications
09 | Keysight | N2887A and N2888A InfiniiMax Soft Touch Probe Head - Data Sheet




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This information is subject to change without notice.