datasheet for E82x7D by Agilent
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Tips for Preventing Damage to
Signal Generator
Popular Agilent models: E443xB, E4438C, E82x7D
Ensure proper grounding
• Always use the three-prong AC power cord supplied with
the signal generator.
• 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
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 signal
• Refer to the specification guide for conditions required to meet
with the listed specification. Note information regarding stabilization time, instrument settings and calibration/alignment
• For example,
◦ E4438C reverse power protection 30 dBm, max DC voltage
50 V, 25 W > 2 GHz.
◦ Coherent carrier output damage level 20 VDC and 13 dBm
reverse RF power.
◦ Data input/ Burst gate input damage level -0.5 V to 5.5 V.
◦ I/Q input damage level are 1 V rms and 10 V peak.
◦ I/Q output damage level are > 3.5 V and < -3.5 V.
Avoid overpowering the signal generator
• Avoid front end damage by having some idea of the signal
generator level output configuration. Reflection of output
signal or external bias connected to signal generator output
may overpower its front end and cause damage to the front
end components. Typical max. RF reverse protection level is
30 dBm (1 W).
• 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 signal generator.
• Avoid test system designs that allow DC voltage or RF
power to be applied to RF output or I/Q output
• Properly apply a DC block, limiter or external attenuator as
needed. For more info visit
• For example,
◦ Agilent 11867A RF limiter is available to provide input
protection. It will reflect signals up to a level of 10 W
average power and 100 W peak power. 11867A will
provide input protection, within the specified frequency
range for the attenuator and mixer for many spectrum
analyzer applications.
◦ 11742A blocking capacitor blocks DC signals below
45 MHz and passes signals up to 26.5 GHz. Ideal for use
with high frequency oscilloscopes or in biased microwave circuits, it will suppress low frequency signals that
can damage expensive measuring equipment.
Protect the RF input connector
Use proper lifting techniques
• Be careful not to bend, bump or flex any device under test
(DUT) connected to the signal generator (such as filters,
attenuators, or large cables). This will reduce the amount of
strain placed on the connector and the mounted hardware.
• Ensure externally connected items are properly supported
(not freely suspended) from the input.
• Always use torque wrench and gauge tools to connect RF
• Do not mix using 50 Ω and 75 Ω connectors and cables.
• Lift the instrument by the handles when transporting.
• Avoid picking up the instrument with your hand over the
front panel. If the instrument slips, damage may occur to
the keypad, knob, or input connectors.
• Use a cart or two persons to help move any heavy
Follow proper RF cable and connector care
• 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 or damage to the connector. For more cable and
connector care tips, refer to Application Note 326 found at
Follow electrostatic discharge precautions
• Electrostatic discharge (ESD) can damage or destroy electronic components. Whenever possible, conduct testing
at a static-safe workstation. Keep electrostatic-generating
materials at least one meter away from all components.
Before connecting any coaxial cable to an analyzer,
momentarily short the center and outer conductors of the
cable together.
• Install ESD protective covers on all RF connectors prior to
shipping and moving equipment.
• For more information about electrostatic discharge, contact
the Electrostatic Discharge Association
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.
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 packing for transport
• Instrument damage can result from using packaging materials other than those specified. Never use styrene pellets in
any shape as packaging materials. They do not adequately
cushion the equipment and can cause equipment damage
by generating static electricity. If possible, retain the
original packaging for re-use when shipping the instrument.
Get the latest information about your
• Check for updated service notes:
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• Check signal generator product information:
• For worldwide service locations visit:
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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
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