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