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, 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
