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{{TM500 | |||
|mfg=Tektronix | |||
|type=PG508 | |||
|function=50 MHz pulse generator | |||
|class=pulse generator | |||
|image=Tek PG508 front.jpg | |||
|introduced=1976 | |||
|discontinued=1993 | |||
|designers=Fred Beckett;Dennis Feucht;Tom Hill;Gary Kersey | |||
|manuals= | |||
* [[Media:070-2044-00.pdf|PG508 Instruction Manual]] | |||
* [https://w140.com/tek_pg508_military_manual.pdf Tektronix PG508 Military Manual] | |||
}} | |||
It was designed by [[Fred Beckett]], [[Dennis Feucht]], [[Tom Hill]], and [[Gary Kersey]]. | |||
Pulses can be triggered by an external input, a manual trigger button, or an internal period generator (optionally gated by the trigger input). | |||
The trigger signal can be undelayed, delayed by a selectable time, or both (in which case double pulses are generated). | |||
The pulse duration, leading and trailing edge transition times, high- and low-level amplitude can be controlled independently. | |||
Period, delay, duration, and transition time switches each feature a custom position where a user-supplied internal capacitor determines the timing. | |||
{{BeginSpecs}} | |||
{{Spec|Period|external, or internal <20 ns to >200 ms in 7 decade steps plus variable; ≥200 ms possible in custom range}} | |||
{{Spec|Jitter|<0.1% +50 ps }} | |||
{{Spec|Delay Time|<10 ns to >100 ms in 7 decade steps plus custom position and variable control; ≥100 ms possible in custom range}} | |||
{{Spec|Pulse Duration|square, or <10 ns to >100 ms in 7 decade steps plus custom position and variable control; ≥100 ms possible in custom range}} | |||
{{Spec|Transition time|Ranges 5 ns to 500 μs in decade steps plus custom position; separate ×1 to ×100 variable controls for leading and trailing edge (5 ns to 50 ms effective) }} | |||
{{Spec|Output level|High and low levels adjustable independently in −20 V to +20 V range, limited to max. 20 V<sub>p-p</sub> / min. 1 V<sub>p-p</sub> (open circuit), 50 Ω source impedance (−10 V to +10 V, 0.5 to 10 V<sub>p-p</sub> into 50 Ω)}} | |||
{{Spec|Trigger/Gate input|Sensitivity 80 mV<sub>p-p</sub> to ≥10 MHz, 250 mV<sub>p-p</sub> to ≥50 MHz at 50 Ω impedance, max. ±5 V<sub>peak</sub>; 1 MΩ // 20 pF optionally selectable (internal switch), max. ±20 V<sub>peak</sub>}} | |||
{{EndSpecs}} | |||
==Rear Interface== | |||
(on right-hand plug-in slot as viewed from front) | |||
{| class="wikitable" | |||
|- | |||
! colspan="2" | Connector Pin | |||
! rowspan="2" | Description | |||
|- | |||
! Signal | |||
! Return | |||
|- | |||
| 27B || 28B || Trig output (complement polarity installed; for normal polarity, front panel input requires optional cable and front output disconnection) ''[note error on manual page 1-12; table 1-13 is correct]'' | |||
|- | |||
| 24B || 25B || Trig input (with optional cable, front panel input must be disconnected) | |||
|- | |||
| 25A || 26A || Amplitude Monitor (from output via 27 kΩ) | |||
|- | |||
| 22A || || External Low Level Control Input (requires internal jumper and trim) | |||
|- | |||
| 22B || || External High Level Control Input (requires internal jumper and trim) | |||
|} | |||
Custom connection solder pads are available on the left plug-in slot, which is otherwise used only for the associated pass transistors in the mainframe. | |||
==References== | |||
* Designs by the Masters – ±20 V, 5 ns, 50 Ω Amplifier (detailed discussion of the PG508 output stage). Horowitz & Hill, Art of Electronics − The x-Chapters, p.150+ | |||
* [[Don Hall]], [[Media:Tekscope_1976_V8_N1.pdf|''A 50 MHz pulse generator with variable transition times''. Tekscope V.8 N.1 1976, p.13+]] | |||
==Links== | |||
* [https://www.youtube.com/watch?v=gtvP_a9PhG8 PG508 Repair and Calibration] by Zenwizard Studios @ YouTube | |||
==Pictures== | |||
<gallery> | <gallery> | ||
Tek PG508 front.jpg | |||
Tek PG508 01.jpg | |||
Tek PG508 02.jpg | Output board (The black coax connection from the output stage to the left plug-in slot is non-standard.) | |||
Tek PG508 03.jpg | |||
Tek PG508 04.jpg | |||
Tek pg508.jpg | |||
Tek pg508 on.jpg | |||
Pg50850mhz-03.jpg | |||
Pg50850mhz-04.jpg | |||
pg508top.jpg | |||
pg508bot.jpg | |||
Tek pg508 rear.jpg | |||
</gallery> | </gallery> | ||
{{Custom ICs|PG508}} | |||
[[Category:TM500 pulse generator plugins]] | [[Category:TM500 pulse generator plugins]] | ||