datasheet for 54754A by Agilent
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Tips for Preventing Damage to
DCA, OSA, TDR Analyzer
Popular Agilent models: 54754A, 86100C
Ensure proper grounding
• Always use the three-prong AC power cord supplied with
the analyzer.
• Proper grounding of the instrument will prevent a build-up
of electrostatic charge which may be harmful to the instrument and the operator.
• Do not damage the earth-grounding protection by using an
extension cable, power cable or autotransformer without a
protective ground conductor.
• Check AC power quality and polarity; typical AC voltage
required is 100 V,120 V, 220 V ±10% or 240 V +5 %/
-10 %. Typical expected grounding wire resistance is
< 1 Ω, the voltage between neutral and ground line is < 1 V.
Install uninterruptible power supply [UPS] if necessary.
• For more information, visit www.metrologyforum.
tm.agilent.com/grounding.shtml.
Read the warning labels and specifications
• Do not exceed the values provided in the specifications
guide or as indicated by the yellow warning labels on the
analyzer.
• Refer to the specification guide for conditions required to
meet the listed specification. Note information regarding
stabilization time, instrument settings and calibration/
alignment requirements.
• For example, the yellow warning label on the front panel of
DCA modules indicates the maximum input level should not
exceed ±2 V!
Avoid overpowering the analyzer
• Avoid front end damage by having some idea of the signal
level to be measured with the analyzer. Overpowering the
front end can cause damage to the front end components.
Typical maximum input signal level is < ±2 V.
• Before turning on or turning off the connected equipment
or the DUT, reduce the signal level to the minimum safety
level. This should help to prevent unexpected voltage swell
or sag affecting the input or the output of instrument.
• Properly apply a DC block, limiter or external attenuator as
required. For more information visit
www.agilent.com/find/mta.
Protect the input connector
• Avoid repeated bending of cables; a single sharp bend can
damage a cable instantly.
• Limit the number of connections and disconnections to
reduce wear.
• Inspect the connectors prior to use; look for dirt, nicks, and
other signs of damage or wear. A bad connector can ruin
the good connector instantly.
• Clean dirty connectors to prevent poor electrical connections and damage to the connector. For more cable and
connector care tips refer to Application Note 326 found at
www.agilent.com/find/cable_care.
Follow electrostatic discharge precautions
• Electrostatic discharge (ESD) can damage or destroy electronic components. Whenever possible, conduct testing at
a static-safe workstation. Keep static-generating materials
at least one meter away from all components.
• When testing passive (non-power) DUT, work on an ESD
workstation or utilize an air ionizer. Discharge the test point
by using a probe directly grounded to the earth, or to the
ground terminal on the DCA mainframe.
• When test active (powered) DUT, be aware that the capacitors can hold charges even after power is removed from the
DU. Voltage on the board can exceed the maximum input
level of the analyzer. The transient voltage may occur from
DUT. Utilize an inline attenuator (e.g. 3 dB) to reduce the
voltage entering the analyzer.
• Loose cables like a capacitor can hold electrostatic
charges. The free end of a cable touching surfaces that
have voltage levels will cause analyzer input damage.
Before connecting any cable to an analyzer input, short
the center and outer conductors of the cable together to
ground momentarily.
• For example: Utilize the discharge mechanism available on
the 54754A.
Check for proper ventilation and humidity
• Periodically check and clean the cooling vents of the instrument. Inadequate airflow can result in excessive operating
temperatures which can lead to instrument failures. Typical
optimal operating temperature is 23 °C to -5 °C, always
keep instrument ambient temperature at < 35 °C.
• When installing the product in a cabinet, the convection
air currents in and out of the instrument must not be
restricted. The ambient temperature must be less than the
maximum operating temperature of the product by 4 °C for
every 100 W dissipated in the cabinet. If the total power
dissipated in the cabinet is greater than 800 W, then forced
convection must be used.
Use proper lifting techniques
• ESD gate p/n 54753-60001, Knurled Attachment Nut
p/n 54754-25701.
• Incorporate a Static Protection Unit such as those available from Picosecond ATE. www.picosecondate.com/
static_protect.html. This device only connects the module
input to your Device Under Test (DUT) after the input
cables have been discharged.
• Lift the instrument by the handles during transportation.
• Avoid picking up the instrument with your hand over the
front panel. If the instrument slips, it may damage the
keypad, knob, or input connector.
• Use a cart or two persons to help move any heavy
instrument.
Get the latest information about your
product
• Check for updated service notes:
www.agilent.com/find/servicenotes
• Subscribe to the Agilent e-mail updates:
www.agilent.com/find/emailupdate
• Check DCA product information:
www.agilent.com/find/dca
• For worldwide service locations information visit:
www.agilent.com/find/assist
• Probe or fixture left out in the air can build up and store
electrical charges. Fixture made of plastic can store
charges, and probing powered devices can subject analyzer
inputs to damaging voltage and power levels. Poor AC
power supply connected to analyzer or DUT may create
AC transients, insufficient grounding, floating neutral lines
which cause damaging currents to flow into or out of DCA
analyzer. An inline attenuator should be utilized to reduce
the voltage level entering analyzer. Monitor analyzer input
signal level with a real-time scope and check for transients
that exceed the maximum input level.
• For more information about electrostatic discharge contact
the Electrostatic Discharge Association www.esda.org.
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Product specifications and descriptions in this document subject to change
without notice.
© Agilent Technologies, Inc. 2011
Printed in USA, April 1, 2011
5989-8786EN
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