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{{TM500 | mfg=Tektronix | type=SG503 | function=250 MHz leveled sinewave generator | class=signal generator | image= | {{TM500 | mfg=Tektronix | type=SG503 | function=250 MHz leveled sinewave generator | class=signal generator | image=SG503_Front_Late.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]] | |||
}} | }} | ||
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. | Nine overlapping ranges cover the frequency band from 250 kHz to 250 MHz, with an additional range reserved for a 50 kHz reference frequency. | ||
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{{BeginSpecs}} | {{BeginSpecs}} | ||
{{Spec | Frequency | 50 kHz, 250 kHz to 250 MHz in nine ranges }} | {{Spec | Frequency | 50 kHz, 250 kHz to 250 MHz in nine ranges }} | ||
{{Spec | Frequency accuracy | Within ±0.7 | {{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 | 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 }} | {{Spec | Harmonics | 2<sup>nd</sup> harmonic ≥35 dB down from fundamental, 3<sup>rd</sup> and higher harmonics ≥40 dB down }} | ||
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==Notes== | ==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. | 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== | ==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) | ||
* [https://www.youtube.com/watch?v=oRUtsDIOA40 | * [[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 | |||
==Prices== | ==Prices== | ||
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==Pictures== | ==Pictures== | ||
<gallery> | <gallery> | ||
SG503_Front_Early.jpg | Early SG503 | |||
Sg503.jpg | Early SG503 | Sg503.jpg | Early SG503 | ||
SG503_Front_Late.jpg | Late SG503 | |||
Tek sg503 late.jpg | Late SG503 | Tek sg503 late.jpg | Late SG503 | ||
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 |