SG505: Difference between revisions

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{{TM500 | mfg=Tektronix | type=SG505 | function=ultra-low distortion oscillator | class=signal generator | image=USA Tektronix SG505 Front0.jpg | introduced=1980 | discontinued=1993 |
{{TM500  
manuals=
|mfg=Tektronix  
* [http://exodus.poly.edu/~kurt/manuals/manuals/Tektronix/TEK%20SG%20505%20Instruction.pdf Tektronix SG 505 Manual (PDF)]
|type=SG505  
|class=signal generator
|function=ultra-low distortion oscillator  
|an=an
|image=USA Tektronix SG505 Front0.jpg  
|introduced=1980  
|discontinued=1993  
|designers=Bruce Hofer
|manuals=
* [[Media:070-2823-00.pdf|Tektronix SG505 Option 01 Manual]]
* [[Media:070-4359-00.pdf|Tektronix SG505 Option 02 Manual]]
* [[Media:Tek sc505 eis no ocr.pdf|Tektronix SG 505 Engineering Instrument Specification]]
}}
}}
Option 01 adds an intermodulation test signal function.<br>
Option 02 adds a fully balanced output to +28 dBm and selectable source impedance with corresponding changes to the front panel connections. It also includes Option 01.


The SG505 was designed by [[Bruce Hofer]].
{{BeginSpecs}}
{{Spec | Frequency range | 10 Hz to 100 kHz nom. (typ. 9 Hz to 110 kHz) in four overlapping ranges }}
{{Spec | Frequency accuracy | 3% of dial reading }}
{{Spec | Output level | +10 dB<sub>m</sub> to −60 dB<sub>m</sub> into 600 Ω in eight 10 dB steps, plus variable control +2.2 dB to −10 dB from calibrated position }}
{{Spec | Output impedance | 600 Ω }}
{{Spec | Distortion | < 0.0008% (−102 dB) from 20 Hz to 20 kHz }}
{{Spec | Sync output | 200 mV<sub>RMS</sub> sine to 20 kHz, at least 120 mV @ 100 kHz; 1 kΩ source impedance }}
{{Spec | Opt. 1 Intermododulation Signal | Regular output signal superimposed with 60 Hz or 250 Hz low frequency signal with 4:1 amplitude ratio.}}
{{EndSpecs}}
==Links==
{{Documents|Link=SG505}}
{{PatentLinks|SG505}}
==Internals==
The SG505 uses a state-variable oscillator topology employing NE5534 opamps and an N-FET (151-1021-00) based AGC. Range switches change capacitors and AGC time constants, the main dial changes the integrator resistor.
It's internally an surprisingly unremarkable device, no special tricks or selected parts (except for the AGC FET, which is probably some COTS FET selected for threshold voltage and distortion), just an ordinary SVO, some NE553x, standard attenuator and that's it.
==See Also==
* [[F7523A1]]
* [https://www.youtube.com/watch?v=c2uHdtpm1mA Zenwizard Studios - TekTronix SG505 Repair and Abridged Validation]
* [https://www.youtube.com/watch?v=3uB28MuskGw Zenwizard Studios - FINALLY Measuring the Distortion of an SG505!]
* [https://www.youtube.com/watch?v=QgIAB0WrqnY Zenwizard Studios - SG505 Op1 Restoration and Distortion Measurements]
==Prices==
{| class="wikitable sortable"
|-
! Year
! 1980
|-
! Catalog Price
| align="right" | $600
|-
! In 2023 Dollars
| align="right" | $2,200
|}
==Pictures==
<gallery>
<gallery>
File:USA Tektronix SG505 Front0.jpg
USA Tektronix SG505 Front0.jpg|Front Panel
Tek sg505 front.jpg|Front Panel
SG505_Right_Internal.jpg|Right Side Internal
SG505_Left_Internal.jpg|Left Side Internal
USA_Tektronix_SG505_LayoutSide.jpg|PCB Right Side
USA_Tektronix_SG505_CompSide.jpg|PCB Left Side
USA_Tektronix_SG505_CompSideB.jpg|PCB Left Side Detail
SG505_Option2_3-4_View.jpg|Option 2 3/4 View
SG505_Option2_Front_Panel.jpg|Option 2 Front Panel
SG505_Option2_Left_Internal.jpg|Option 2 Left Internal
SG505_Option2_Right_Internal.jpg|Option 2 Right Internal
</gallery>
</gallery>
{{MissingSpecs}}

Latest revision as of 05:32, 6 October 2024

Tektronix SG505
ultra-low distortion oscillator
Tektronix SG505

Produced from 1980 to 1993

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix SG505 is an ultra-low distortion oscillator plug-in for the TM500 system.

Option 01 adds an intermodulation test signal function.
Option 02 adds a fully balanced output to +28 dBm and selectable source impedance with corresponding changes to the front panel connections. It also includes Option 01.

The SG505 was designed by Bruce Hofer.

Key Specifications

Frequency range 10 Hz to 100 kHz nom. (typ. 9 Hz to 110 kHz) in four overlapping ranges
Frequency accuracy 3% of dial reading
Output level +10 dBm to −60 dBm into 600 Ω in eight 10 dB steps, plus variable control +2.2 dB to −10 dB from calibrated position
Output impedance 600 Ω
Distortion < 0.0008% (−102 dB) from 20 Hz to 20 kHz
Sync output 200 mVRMS sine to 20 kHz, at least 120 mV @ 100 kHz; 1 kΩ source impedance
Opt. 1 Intermododulation Signal Regular output signal superimposed with 60 Hz or 250 Hz low frequency signal with 4:1 amplitude ratio.

Links

Documents Referencing SG505

Document Class Title Authors Year Links
Tekscope 1980 V12 N1.pdf Article New Products 1980 308 • SG505 • 8002A
Tekscope 1980 V12 N2.pdf Article New Products 1980 7854 • 468 • AA501 • SG505 • CG551AP • 1900 • 7612D
Tekscope 1980 V12 N3.pdf Article Automatic Distortion Analyzer Speeds Distortion Measurements Bruce Hofer 1980 AA501 • SG505
070-2088-04.pdf Book TM500 Series Rear Interface Data Book 1985 AA501 • AF501 • AM501 • AM502 • AM503 • AM511 • DC501 • DC502 • DC503 • DC503A • DC504 • DC505 • DC505A • DC508 • DC508A • DC509 • DC510 • DC5009 • DC5010 • DD501 • DL502 • DM501 • DM501A • DM502 • DM502A • DM505 • DM5010 • FG501 • FG501A • FG502 • FG503 • FG504 • FG507 • FG5010 • LA501 • LA501W • WR501 • MR501 • PG501 • PG502 • PG505 • PG506 • PG507 • PG508 • PS501 • PS502 • PS503 • PS503A • PS505 • PS5010 • RG501 • SC501 • SC502 • SC503 • SC504 • SG502 • SG503 • SG504 • SG505 • SW503 • TG501 • TR501 • TR502 • MI5010 • MX5010 • SI5010

Internals

The SG505 uses a state-variable oscillator topology employing NE5534 opamps and an N-FET (151-1021-00) based AGC. Range switches change capacitors and AGC time constants, the main dial changes the integrator resistor.

It's internally an surprisingly unremarkable device, no special tricks or selected parts (except for the AGC FET, which is probably some COTS FET selected for threshold voltage and distortion), just an ordinary SVO, some NE553x, standard attenuator and that's it.

See Also

Prices

Year 1980
Catalog Price $600
In 2023 Dollars $2,200

Pictures

  • Front Panel

    Front Panel

  • Front Panel

    Front Panel

  • Right Side Internal

    Right Side Internal

  • Left Side Internal

    Left Side Internal

  • PCB Right Side

    PCB Right Side

  • PCB Left Side

    PCB Left Side

  • PCB Left Side Detail

    PCB Left Side Detail

  • Option 2 3/4 View

    Option 2 3/4 View

  • Option 2 Front Panel

    Option 2 Front Panel

  • Option 2 Left Internal

    Option 2 Left Internal

  • Option 2 Right Internal

    Option 2 Right Internal

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