Read This First: Preventing ESD/EOS in 8 Series
This document provides guidelines that will help you reduce the risk of
electrostatic discharge (ESD) or electrical overvoltage stress (EOS) damage to
your samplin
Terms
g modules.
ing terms are used in this document:
sands of volts. A single ESD event can cause the sampling head to fail.
age level that is slightly higher than its designed limit. EOS damage can
ESD
EOS
The follow
ESD (electrostatic discharge) is the momentary discharge of electricity between
objects that are at different potentials. ESD can have amplitudes in hundreds or
even thou
EOS (electrical overvoltage stress) occurs when an electronic device is subjected
to a volt
occur at low voltage levels. EOS damage has a cumulative effect, and over time
causes the sampling head to fail. Standard methods for preventing ESD are not
very effective against EOS damage.
Installing TSO8C17 and TSO8C18 optical modules
Procedure for installing and removing modules.
The TSO820 sampling oscilloscope allows for installation of the followingtwo
modules. For detailed specifications information, see the TSO820, TSO8C17,
TSO8C18 Sampling Oscilloscope and Modules Specifications and Performance
Ver i fication manual available for download on www.tek.com.
www.tek.com
Copyright © Tektronix
$
071-3675-00
TSO8C17, 1 channel 28 GBd / 53 GBd
TSO8C18, 2 channel 28 GBd / 53 GBd
CAUTION. Do not hot swap modules. Installing or removing modules into/from
the mainframe with the power on will damage the module. To avoid damage, turn
ff the power before installing or removing a module.
o
CAUTION. Only qualified personnel should perform the following procedures.
Ensure power is off to the unit before installing or removing modules.
CAUTION. To prevent damage to the modules, wear a grounded antistatic strap
when removing and installing modules and cables connected to modules.
Read This First: Preventing ESD/EOS
1. Power off the ma
2. Use a flathead screw driver to loosen the two latch screws that secure the top
cover to the ma
3. Notice that the mainframe ships with one filler module installed. This is a
place holder that ensures proper air flow and temperature stability when only
one modu
le is installed.
inframe.
inframe and lift off the cover.
Before installing a module, remove the filler module from the side into which
you wan
are captive and stay attached to the filler module).
Never
running. Always have a filler or regular modules installed to ensure proper air
flow and temperature stability.
4. Insert the desired module into the mainframe at an angle, as shown.
5. Push down lightly on the rear of the module to seat it securely into the
mainframe. You will hear a click when it seats fully.
6. Tighten the 4 attached screws to secure the module to the mainframe.
t to insert the regular module by loosening the securing screws (they
leave a module slot empty while the instrument is powered on and
2 Preventing ESD and EOS Damage
Read This First: Preventing ESD/EOS
Connecti
7. Replace the mai
8. Before taking measurements, allow a minimum 30 minutes warm-up and
ng optical signals
CAUTION. To prevent loss of optical power or damage to the optical connectors,
keep the connectors clean at all times. Check that all connectors, jumpers, and
protective caps are clean before connecting them to the module.
nframe cover and use the driver again to turn the screw
latches to secure it in place.
run a compensation.
Do not drop an optical module, as doing so can cause damage and misalignment
of the photodiode optical assembly.
Optical modules use a universal connector interface (UCI) that allows use of
many standard fiber-optic female connector styles. Some of the standard UCI
interfaces supported are FC, ST, SC, and DIN.
Attach the fiber optic cable with a suitable connector or a UCI Interface adapter to
the optical input receptacle as follows:
1. Line up the key with the slot in the UCI adapter before inserting.
2. Firmly press the cable connector or adapter into the UIC interface ferrule
until it reaches the stop.
CAUTION. Do not insert the connector into the UCI adapter at an angle. Do
not insert the connector and then rotate to line up the key with the slot. Either
ction may damage the UCI adapter.
a
Preventing ESD and EOS Damage 3
Read This First: Preventing ESD/EOS
4. Firmly tighten
pressure only.
5. To remove, loosen the cable connector or adapter shell.
CAUTION. To avoid damaging the module optical input, maintain signal levels
within optimal performance range, and avoid clipping, attenuate the input
optical signal to the Absolute Maximum Nondestructive Optical Input (peak)
specifications.
Optical sampling modules may have dynamic ranges exceeded without obvious
visual indication on the display because the overloaded photodetector signal
output may still be within the dynamic range of the internal electrical sampler.
Cleaning optical connectors
1. Obtain the following equ
the cable connector or the adapter shell. Tighten with finger
ipment:
One compressed air can (Tektronix part number 118-1068-01).
A cleaning tool such as a FIS cassette cleaner (FI-6270), a FIS tape
dispenser cleaner (FI-7111), or an Optipop pipe cleaner (F1-6364).
Cleaning kits for optical connectors (such as the Tektronix Optical
Connector Cleaner part number 020-24
suppliers.
94-xx) are available from several
2. Loosen the UCI adapter and remove it. This exposes the male fiber end-face
behind the UCI connector.
3. Pull the pipe cleaner through the hollow female-to-female ferrule alignment
tube inside the UCI adapter. Then use the compresse
the UCI adapter.
CAUTION. Do not blow compressed air into the female input of the UCI adapter
when it is installed on the module.
4. Advance the fiber cleaning cassette or tape-dispenser
unused clean section of the lint-free, dry, cleaning surface.
5. Lightly drag the clean, dry, surface of the cleaning tool cloth against the male
end-face of the fiber input for a short distance (a centimeter or two).
6. Place the UCI adapter back on the cleaned fiber end-face on the module.
7. When the module does not have a fiber cable attached to its input(s), attach
the black dust-cap to prevent airborne contaminates from lodging in the
female optical input.
8. Clean any male fiber end-face input fiber cable or device that you attach to
the UCI input.
d air to clean the tube of
cleaner to expose an
4 Preventing ESD and EOS Damage
Read This First: Preventing ESD/EOS
Preventing ES
D
Electrostatic discharge (ESD) can damage a module’s electrical inputs and
outputs. Observe the following guidelines to prevent ESD.
Always use a grounded wrist strap (provided with your instrument) when
installing or removing modules from the mainframe and when connecting
cables.
Wear anti-static clothing and work in a static-free are when using sampling
modules.
Discharge cables to ground before connecting them to modules.
Do not create an ESD antenna by leaving cables attached to the
sampling-module input with the other end of the cable open.
Preventing ESD and EOS Damage 5
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