User’s
Guide
HP N1020A—at a glance 2
Installing the Probe 4
Normalizing the Probe 6
Probe Characteristics 10
Replaceable Parts 11
Contacting HP 12
Warranty 13
Safety Symbols 14
HP N1020A TDR Probe
HP N1020A—at a glance
The HP N1020A TDR Probe facilitates accurate, repeatable time domain reflectometry measurements in situations where RF connectors are unavailable. It is ideal for
use with the HP 54753A and HP 54754A TDR plug-in
modules.
Figure 1. HP N1020A TDR Probe
The HP N1020A TDR Probe includes the following
items:
■ RF cable (SMA, 36-inch)
■ Calibration substrate (quantity 2)
■ Grounding pin
■ Tweezer
2
Figure 2. Probe tip and grounding pin
Accessories available
The following accessories are available from Cascade
Microtech®.
Internet address: http://www.cascademicrotech.com
■ Fixed-pitch compliant 50
hybrids, and MCMs. Bandwidth from dc to 20 GHz.
Order FPC-GSG-xxxx probe.
■ Fine-pitch active 100k
brids, and MCMs. Bandwidth from dc to 2.5 GHz. Order FPA-10X probe.
■ DC coaxial microprobes
■ Fine-pitch microprobes
■ Fine-pitch DC needle holder
Ω
probe for testing SMTs,
Ω
probe for testing SMTs, hy-
3
Installing the Probe
Locate the
1
grounding pin
supplied with
the probe.
As explained in
2
the following
caution
statement,
insert the long
end of the
grounding pin
into one of the holes that are located in the tip of the
probe. Select any hole that is located in the spiral
pattern.
CAUTION
connected by a spring. To avoid damaging the grounding pin,
always insert the longest solid end into the probe tip.
Using tweezers, gently push the pin until it is fully
3
seated into the hole.
Connect the supplied SMA cable to the TDR probe.
4
CAUTION
can be damaged by electrostatic discharge.
Discharge any static buildup on the SMA cable.
5
Momentarily short the center and outer conductors
of the cable together. Avoid touching the front-panel
input connectors without first touching the frame of
the instrument.
4
The grounding pin consists of two solid end pieces
The input circuits on the HP 83480A plug-in modules
6 Connect the other end of the SMA cable to the TDR
plug-in module’s Channel input connector.
Moving the grounding pin
The probe comes with a movable grounding pin to make
connections to the ground plane easier. Use the following steps to move of grounding pin:
1 Using the supplied tweezers, gently pull the pin out
of the probe tip.
2 Insert the pin into one of the adjacent, conveniently-
located holes. Notice that these holes are in a spiral
pattern.
3 Using the tweezers, gently push the pin until it is
fully seated into the hole.
5
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