Tektronix 80A03 Reference

80A03 TekConnectProbe Interface Module Instruction Manual 21

Reference

This section containsinformation you may need to take measurements or to

avoid damaging the 80A03 TekConnectProbe Interface Module.

Know your signal source. If it is capable of deliveringovervoltages, it is safer to

not depend on the signal source settings for protection,but instead use an

externalattenuator that protects the input from the worst-case conditions. For

example, for a 20 V maximum s ource connected to a 3 V maximum s ampling

module, use a 10X attenuator.Where possible, connect your cables to the signal

source first, and to the sampling module second.

Youcan use a Tektronix 80A02 EOS/ESD Protection Module to protect the

sensitive input stage of sampling module from damagedue to electro-overstress

(EOS) and electro-staticdischarge (ESD) from the device under test (DUT). Use

the 80A02 in applicationssuch as TDR circuit-board testing and cable testing

where largestatic charges can be stored on the device under test.

Install the 80A02 EOS/ESD Protection Module between the device undertest

(DUT) and thesampling module. When used with the P8018 TDR probe, the

80A02 achievesstatic protection using normal probing procedures — no

intentional userintervention (such as stepping on a foot switch) is required. This

eliminates instrumentdamage due to human error in coordinating probing with

control switching to achievestatic protection.

Circuitry in the samplingmodule is very susceptible to damage from electrostat-

ic dischargeor from overdrive signals. Be sure to only operate the sampling

module in a static-controlledenvironment. Be sure to discharge to ground any

electrostatic charge that may be present on the center and outer connect ors of

cables beforeattaching the cable to the sampling module.