SG503: Difference between revisions

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{{TM500 | mfg=Tektronix | type=SG503 | function=250 MHz leveled sinewave generator | class=signal generator | image=SG503_Front_Late.jpg | introduced=1974 | discontinued=1993 |
{{TM500 | mfg=Tektronix | type=SG503 | function=250 MHz leveled sinewave generator | class=signal generator | image=SG503 Front Early.jpg | introduced=1974 | discontinued=1993 |
designers= |manuals=
designers= |manuals=
* [[Media:070-1622-01-1974.pdf|SG503 Instruction Manual 070-1622-01 <br> Early type]]
* [[Media:070-1622-01-1974.pdf|SG503 Instruction Manual 070-1622-01 <br> Early type]]
* [[Media:070-1622-01.pdf|SG503 Manual 070-1622-01 <br> s/n: B010100 through B089999]]
* [[Media:070-1622-01.pdf|SG503 Manual 070-1622-01 <br> s/n: B010100 through B089999]]
* [[Media:070-6770-00.pdf|SG503 Manual 070-6770-00 <br> s/n: B090000 and up]]
* [[Media:070-6770-00.pdf|SG503 Manual 070-6770-00 <br> s/n: B090000 and up]]
* [[Media:Tek SG503 Wizard Workshop mods.pdf|SG503 Modifications from Wizards Workshop]]
}}
}}
Nine overlapping ranges cover the frequency band from 250 kHz to 250 MHz, with an additional range reserved for a 50 kHz reference frequency.
It was primarily intended to be used as an oscilloscope calibration device for measuring bandwidths up to 250 MHz.  Unlike later instruments like the [[SG504]], it does not use a leveling head but was designed and calibrated with high quality coaxial cable (P/N [[012-0482-00]]) to operate as a closely matched system when terminated into a 50 Ω load.
It was primarily intended to be used as an oscilloscope calibration device for measuring bandwidths up to 250 MHz.  Unlike later instruments like the [[SG504]], it does not use a leveling head but was designed and calibrated with high quality coaxial cable (P/N [[012-0482-00]]) to operate as a closely matched system when terminated into a 50 Ω load.
Nine overlapping ranges cover the frequency band from 250 kHz to 250 MHz, with an additional range reserved for a 50 kHz reference frequency.


The SG503 shows the selected frequency on a 3-digit LED counter.
The SG503 shows the selected frequency on a 3-digit LED counter.
Line 24: Line 25:
The SG503 uses two LC Hartley oscillators, one for 100 MHz and above with an air-core inductor, the other for the lower ranges using switched ferrite-core inductors.  Tuning is accomplished via a traditional three-section variable capacitor. After filtering, a regulated power amplifier stage (caution: [[beryllium oxide]] in transistor cases!) is followed by a peak-to-peak detector for the amplitude control loop, and switchable output attenuators.
The SG503 uses two LC Hartley oscillators, one for 100 MHz and above with an air-core inductor, the other for the lower ranges using switched ferrite-core inductors.  Tuning is accomplished via a traditional three-section variable capacitor. After filtering, a regulated power amplifier stage (caution: [[beryllium oxide]] in transistor cases!) is followed by a peak-to-peak detector for the amplitude control loop, and switchable output attenuators.


The frequency counter is built from a 10131 ECL prescaler followed by 7490 TTL BCD counters and 7-segment decoders (display not multiplexed).
The frequency counter circuit starts with a ÷8 prescaler (SP1670 and 10131 ECL flip-flops) followed by 7490 TTL BCD counters and 7-segment decoders (display not multiplexed).


==Notes==
==Notes==
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* [[Media:SG503_P2P_Substitute_REVISED.pdf|SG503 Peak-to-Peak detector substitute]] by John K. Bennett AE0AM
* [[Media:SG503_P2P_Substitute_REVISED.pdf|SG503 Peak-to-Peak detector substitute]] by John K. Bennett AE0AM
* [https://www.youtube.com/watch?v=oRUtsDIOA40 SG503 Lab Check In and Calibration] by Zenwizard Studios @ YouTube
* [https://www.youtube.com/watch?v=oRUtsDIOA40 SG503 Lab Check In and Calibration] by Zenwizard Studios @ YouTube
* [https://www.youtube.com/watch?v=O0E6QeX82LY Tektronix SG503 Refresh and Alignments] by Zenwizard Studios @ YouTube
{{Documents|Link=SG503}}


==Prices==
==Prices==
1979: $1,325 ($5,200 in 2022 Dollars)
{| class="wikitable sortable"
|-
! Year
! 1979
! 1980
|-
! Catalog Price
| align="right" | $1,325
| align="right" | $1,375
|-
! In 2023 Dollars
| align="right" | $5,600
| align="right" | $5,100
|}


According to an [[Media:Tek Schottky Diodes Memo rot.pdf|internal memo]], in 1979 annual sales were estimated at 1200 units.
According to an [[Media:Tek Schottky Diodes Memo rot.pdf|internal memo]], annual sales were estimated at 1200 units in 1979.


==Pictures==
==Pictures==
'''Early model'''
<gallery>
Tek SG503 early front.jpg              |
SG503_Front_Early.jpg                  |
Tek SG503 early left.jpg                | Left Internal
Tek SG503 early right.jpg              | Right Internal
Tek SG503 Attenuator Board.jpg          | Attenuator Board Part
Tek SG503 Attenuator Board Top.jpg      | Attenuator Board Top
Early SG503 Attenuator Board Bottom.jpg | Attenuator Board Bottom
</gallery>
'''Late model'''
<gallery>
<gallery>
SG503_Front_Early.jpg | Early SG503
SG503_Front_Late.jpg
Sg503.jpg | Early SG503
Tek sg503 late.jpg
SG503_Front_Late.jpg | Late SG503
SG503_Left_Late.jpg                     | Left Internal
Tek sg503 late.jpg | Late SG503
SG503_Right_Late.jpg                   | Right Internal
SG503_Left_Late.jpg | Late Left Internal
SG503_Right_Late.jpg | Late Right Internal
Tek sg503 left internal.jpg
Tek sg503 left internal.jpg
Tek sg503 rear internal.jpg
Tek sg503 rear internal.jpg
Line 52: Line 79:
</gallery>
</gallery>


{{Custom ICs|SG503}}
==Components==
{{Parts|SG503}}

Latest revision as of 14:56, 4 December 2023

Tektronix SG503
250 MHz leveled sinewave generator
Tektronix SG503

Produced from 1974 to 1993

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix SG503 is a 250 MHz leveled sinewave generator plug-in for the TM500 system.

Nine overlapping ranges cover the frequency band from 250 kHz to 250 MHz, with an additional range reserved for a 50 kHz reference frequency.

It was primarily intended to be used as an oscilloscope calibration device for measuring bandwidths up to 250 MHz. Unlike later instruments like the SG504, it does not use a leveling head but was designed and calibrated with high quality coaxial cable (P/N 012-0482-00) to operate as a closely matched system when terminated into a 50 Ω load.

The SG503 shows the selected frequency on a 3-digit LED counter.

Key Specifications

Frequency 50 kHz, 250 kHz to 250 MHz in nine ranges
Frequency accuracy Within ±0.7 of one count of the least significant displayed digit for the indicated frequency
Amplitude 5 mVp-p to 5.5 Vp-p in three decade ranges (terminated into a 50 Ω load)
Harmonics 2nd harmonic ≥35 dB down from fundamental, 3rd and higher harmonics ≥40 dB down

Rear interface

The sine output, remote amplitude control input, and a 12-bit non-multiplexed BCD version of the counter value are available via the rear connector.

Internals

The SG503 uses two LC Hartley oscillators, one for 100 MHz and above with an air-core inductor, the other for the lower ranges using switched ferrite-core inductors. Tuning is accomplished via a traditional three-section variable capacitor. After filtering, a regulated power amplifier stage (caution: beryllium oxide in transistor cases!) is followed by a peak-to-peak detector for the amplitude control loop, and switchable output attenuators.

The frequency counter circuit starts with a ÷8 prescaler (SP1670 and 10131 ECL flip-flops) followed by 7490 TTL BCD counters and 7-segment decoders (display not multiplexed).

Notes

The Tek 012-0482-00 cable is made from RG-223 50 Ω double-braid shielded coaxial cable (or equivalent), and is exactly 36" from end-to-end.

Links

Documents Referencing SG503

Document Class Title Authors Year Links
070-2088-00.pdf Book TM500 Series Rear Interface Data Book 1975 AF501 • AM501 • AM502 • DC501 • DC502 • DC503 • DC504 • DC505 • DC505A • DM501 • DM502 • FG501 • FG502 • FG503 • MR501 • PG501 • PG502 • PG505 • PG506 • PG508 • PS501 • PS502 • PS503 • PS503A • PS505 • RG501 • SC501 • SC502 • SG502 • SG503 • TG501
070-2088-01.pdf Book TM500 Series Rear Interface Data Book 1976 AF501 • AM501 • AM502 • AM511 • DC501 • DC502 • DC503 • DC504 • DC505 • DC505A • DD501 • DM501 • DM502 • FG501 • FG502 • FG503 • FG504 • LA501 • MR501 • PG501 • PG502 • PG505 • PG506 • PG508 • PS501 • PS502 • PS503 • PS503A • PS505 • RG501 • SC501 • SC502 • SG502 • SG503 • SG504 • SW503 • TG501 • TR501 • TR502
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

Prices

Year 1979 1980
Catalog Price $1,325 $1,375
In 2023 Dollars $5,600 $5,100

According to an internal memo, annual sales were estimated at 1200 units in 1979.

Pictures

Early model

  • Left Internal

    Left Internal

  • Right Internal

    Right Internal

  • Attenuator Board Part

    Attenuator Board Part

  • Attenuator Board Top

    Attenuator Board Top

  • Attenuator Board Bottom

    Attenuator Board Bottom

Late model

  • Left Internal

    Left Internal

  • Right Internal

    Right Internal

Components

Some Parts Used in the SG503

Part Part Number(s) Class Description Used in
151-0614-00 151-0614-00 Discrete component Tek-made RF power transistor SG503
155-0107-00 155-0107-00 Hybrid integrated circuit leveller SG503
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