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80A03 TekConnect Probe Interface Module Instruction Manual
21
Reference
This section contains information you may need to take measurements or to
avoid damaging the 80A03 TekConnect P robe Interface Module.
Avoiding Damage from Overvoltage
Know your signal source. If it is capable of delivering overvoltages, it is safer to
not depend on the signal source settings for protection, but instead use an
external attenuator that protects the input from the worst-case conditions. For
example, for a 20 V maximum source connected to a 3 V maximum sampling
module, use a 10X attenuator. Where possible, connect your cables to the signal
source first, and to the sampling module second.
You can use a Tektronix 80A02 EOS/ESD Protection Module to protect the
sensitive input stage of sampling module from damage due to electro-overstress
(EOS) and electro-static discharge (ESD) from the device under test (DUT). Use
the 80A02 in applications such as TDR circuit-board testing and cable testing
where large static charges can be stored on the device under test.
Install the 80A02 EOS/ESD Protection Module between the device under test
(DUT) and the sampling module. When used with the P8018 TDR probe, the
80A02 achieves static protection using normal probing procedures — no
intentional user intervention (such as stepping on a foot switch) is required. This
eliminates instrument damage due to human error in coordinating probing with
control switching to achieve static protection.
Avoiding Damage from Electrostatic Discharge
Circuitry in the sampling module is very susceptible to damage from electrostat-
ic discharge or from overdrive signals. B e sure to only operate the sampling
module in a static-controlled environment. Be sure to discharge to ground any
electrostatic charge that may be present on the center and outer connectors of
cables before attaching the cable to the sampling module.