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Tektronix ADA400A Instruction Manual page 27

Differential preamplifier
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Reference
Differential Preamplifier allows you to select upper bandwidth limits of
FULL
(i MHz), 100 kHz, 3 kHz and 100 Hz.
Disruptive electrical interference or "noise" from sources near the test setup can
affect measurements. The effects become even more apparent when measuring
low-amplitude voltages.
The electric-power system, for example, generates a line frequency of 50 or
60 Hz and can couple electrical noise from other devices. Power switches or
switching devices generate power line spikes. Unshielded or poorly grounded
electric motors can generate disruptive transients. Power lines and transformers
create magnetic fields that can induce a disruptive voltage in wires or input leads
that are not properly twisted together.
power supplies generate interference in the range of 20 to 100 kHz. Sources of
interference can include florescent lights, laser printers, monitors, CRTs, even
radio transmissions.
signal interference in most cases. There are three important strategies to reducing
signal interference:
1,
Use the proper signal and ground connections for the particular application.
2.
Limit the bandwidth of the test setup.
to the input:
TM = =6Minimize length of input leads.
=
Select input leads that have the same length and type of construction.
a
Use shielded coaxial cable or "twisted-pair' leads on the inputs.
w
~=Connect shield or ground leads close to signal source.
=
Restrict movement of input leads.
a
Eliminate ground loops.
@
Reject common-mode noise by operating in differential mode.
7

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