Tektronix TOP400 Handheld Optical Attenuator

Tektronix TOP400 Handheld Optical Attenuator

This Tektronix TOP400 Handheld Optical Attenuator is used and in excellent condition.

Optical Interface: PC*

*This unit comes with the standard Acterna / W&G optical interface as shown here. The JDSU / Acterna / W&G 2060 Universal Test Adapters are sold separately. They can be purchased here.

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Stock # 57194-2
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Tektronix TOP400 Handheld Optical Attenuator

  • Adjustable Attenuation
  • Less than 2dB Insertion Loss
  • Ideal for Testing System Headroom
  • Passive Device - No Power Required
  • Universal Connector Interface (UCI)


The Tektronix TOP400 is a handheld optical attenuator. Its superior design allows it to have less than 2dB of insertion loss. The TOP400, when used with an optical power meter and source, allows the user to manually dial in attenuation to determine system headroom. It is a passive device and does not require any batteries or power for operation.

The TOP400 uses a proprietary scheme for the attenuating mechanism. The small size and large dial indicator make this instrument an indispensable tool for fiber optic line commissioning, bit error rate (BER) measurements, system margin analysis and receiver sensitivity testing. All optical connections are via the precision Universal Connector Interface (UCI) which offers low insertion loss, low return loss and excellent stability.


• System Loss Measurements
• Optical Troubleshooting
• Fault Location
• Installation
• Optical Links
• Maintenance
• Research

Important Notice: Please note that any additional items included with this equipment such as accessories, manuals, cables, calibration data, software, etc. are specifically listed in the above stock item description and/or displayed in the photos of the equipment. Please contact one of our Customer Support Specialists if you have any questions about what is included with this equipment or if you require any additional information.

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Insertion Loss<2dB (1.25dB typical)
Attenuation Range0 to 35dB
Return Loss<-40dB (with FC, ST, SC and DIN connectors)
<-50dB (with optional APC connectors)
Connector InterfaceUniversal Connector Interface (UCI)
Environmental TemperatureOperating: -15 °C to +60 °C, 0-95% RH (noncondensing)
Storage: -35 °C to +70 °C, 0-95% RH (noncondensing)
Physical CharacteristicsDimensions: mm, in.
Width: 72, 2.8
Height: 142, 5.6
Depth: 36, 1.4
Weight: g, oz.
Net: 230, 8.1

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Item Images

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Tektronix TOP400 Handheld Optical Attenuator

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Manuals, Datasheets, Drivers, Links

Tektronix TOP400 Datasheet (pdf) 
Link to Tektronix Website 

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