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SG503: Difference between revisions
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{{TM500 | mfg=Tektronix | type=SG503 | function=250 MHz | {{TM500 | mfg=Tektronix | type=SG503 | function=250 MHz leveled sinewave generator | class=signal generator | image=SG503 Front Early.jpg | introduced=1974 | discontinued=1993 | | ||
manuals= | designers= |manuals= | ||
* [ | * [[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:070-6770-00.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. | ||
The SG503 shows the selected frequency on a 3-digit LED counter. | |||
{{BeginSpecs}} | |||
{{Spec | Frequency | 50 kHz, 250 kHz to 250 MHz in nine ranges }} | |||
{{Spec | Frequency accuracy | Within ±0.7 of one count of the least significant displayed digit for the indicated frequency }} | |||
{{Spec | Amplitude | 5 mV<sub>p-p</sub> to 5.5 V<sub>p-p</sub> in three decade ranges (terminated into a 50 Ω load) }} | |||
{{Spec | Harmonics | 2<sup>nd</sup> harmonic ≥35 dB down from fundamental, 3<sup>rd</sup> and higher harmonics ≥40 dB down }} | |||
{{EndSpecs}} | |||
==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== | |||
* [https://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_500/SG503.htm SG503 @ amplifier.cd] (German) including measurements of cable influence (1 m Belden H-155 as replacement for original cable) | |||
* [[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=O0E6QeX82LY Tektronix SG503 Refresh and Alignments] by Zenwizard Studios @ YouTube | |||
{{Documents|Link=SG503}} | |||
==Prices== | |||
{| 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]], annual sales were estimated at 1200 units in 1979. | |||
==Pictures== | ==Pictures== | ||
'''Early model''' | |||
<gallery> | <gallery> | ||
Tek SG503 early front.jpg | | |||
Tek | 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> | </gallery> | ||
'''Late model''' | |||
<gallery> | |||
SG503_Front_Late.jpg | |||
Tek sg503 late.jpg | |||
SG503_Left_Late.jpg | Left Internal | |||
SG503_Right_Late.jpg | Right Internal | |||
Tek sg503 left internal.jpg | |||
Tek sg503 rear internal.jpg | |||
Tek sg503 front left internal.jpg | |||
</gallery> | |||
==Components== | |||
{{Parts|SG503}} | |||