View source for TG501A

{{TM500 | mfg=Tektronix | type=TG501A | function=time-mark generator | class=pulse generator | image=Tek tg501a.jpg | introduced=1990 | discontinued=1995 |
manuals=
* [[Media:070-7373-00.pdf|TG501A Manual 070-7373-00]]
}}

Note the [https://www.eevblog.com/forum/repair/tektronix-tg501-out-put-problem/ output must be terminated into 50 Ω] or there may be no signal at all.

{{BeginSpecs}}
{{Spec | Interval                 | 1 ns to 5 s in 1−2−5 sequence }}
{{Spec | Timing accuracy          | Stability 1×10<sup>-5</sup>, long-term drift 1×10<sup>-5</sup> per month (with Option 1, 5×10<sup>-7</sup> / 1×10<sup>-7</sup> per month) }}
{{Spec | Error Readout            | Accuracy 1 digit (±0.1% points), Range to ±7.5% }}
{{Spec | Amplitude                | ≥1 V peak on 5 s through 10 ns; ≥750 mV<sub>p-p</sub> on 5 ns and 2 ns; ≥200 mV<sub>p-p</sub> on 1 ns (separate output) (all into 50 Ω) }}
{{Spec | Trigger Output           | Slaved to marker output from 5 s through 100 ns. Remains at 100 ns for all faster markers }}
{{Spec | External Reference Input | 1 MHz, 5 MHz or 10 MHz; TTL compatible (internally hard wired so output frequencies counted down to 1 MHz) }}
{{EndSpecs}}
* Option 01 adds a 5 MHz tempature-compensated crystal oscillator (Y50), and a TTL decade counter (U50) for a stable, precise internal clock.
''to be verified''