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Tektronix 281 TDR Pulser. | {{Instrument Sidebar | ||
|manufacturer=Tektronix | |||
|model=281 | |||
|class=Reflectometer | |||
|series= | |||
|summary=TDR Pulser | |||
|image=Type 281 1.JPG | |||
|caption=Tektronix 281 TDR Pulser | |||
|introduced=1966 | |||
|discontinued=(?) | |||
|manuals= | |||
* [[Media:070-0515-00.pdf|Tektronix 281 Manual]] | |||
}} | |||
The '''Tektronix 281 TDR Pulser''' is an accessory that plugs into the probe power jack on [[1S1]], [[3S1]], and [[4S1]] plug-ins. | |||
It has two [[GR-874 connector]]s. One connector is intended to be connected to the input of a [[sampling oscilloscope]]. | |||
The other connector attaches to the cable that is being tested. | |||
The 281 periodically produces a pulse that is launched down a cable. | |||
The returning reflection is allowed to pass into the oscilloscope for measurement. | |||
The pulse is specified to be 460 mV, with a rise time of 750 ps or less, with a 5 μs pulse width. | |||
The 281 uses a [[1N3130]] tunnel diode as a multivibrator. | |||
The multivibrator drives a common-base output transistor. | |||
==Pictures== | |||
<gallery> | |||
Tek 281 1968 catalog.jpg|Entry in 1968 catalog | |||
Type 281 1.JPG | |||
Type 281 2.JPG | |||
Type 281 3.JPG | |||
Type 281 4.JPG | |||
Type 281 5.JPG | |||
Type 281 6.JPG | |||
Type 281 7.JPG | |||
Type 281 8.JPG | |||
Tek 281 schem.png|schematic | |||
</gallery> | |||
==Components== | |||
{{Parts|281}} | |||
[[Category:Pulse generators]] | |||
[[Category:Time-domain reflectometers]] | |||
[[Category:GR874]] | |||
Latest revision as of 06:21, 25 October 2023
The Tektronix 281 TDR Pulser is an accessory that plugs into the probe power jack on 1S1, 3S1, and 4S1 plug-ins.
It has two GR-874 connectors. One connector is intended to be connected to the input of a sampling oscilloscope. The other connector attaches to the cable that is being tested.
The 281 periodically produces a pulse that is launched down a cable. The returning reflection is allowed to pass into the oscilloscope for measurement. The pulse is specified to be 460 mV, with a rise time of 750 ps or less, with a 5 μs pulse width.
The 281 uses a 1N3130 tunnel diode as a multivibrator. The multivibrator drives a common-base output transistor.
Pictures
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Entry in 1968 catalog
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schematic
Components
Some Parts Used in the 281
| Part | Part Number(s) | Class | Description | Used in |
|---|---|---|---|---|
| 1N3130 | 152-0078-00 | Discrete component | 50 mA, 25 pF Germanium tunnel diode | 661 • 281 |