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TG501: Difference between revisions

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TG501 (view source)

Revision as of 14:02, 10 December 2021

1,258 bytes added ,  10 December 2021
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{{TM500 | mfg=Tektronix | type=TG501 | function=time mark generator | class=pulse generator | image=Tek tg501 on.JPG | introduced=1974 | discontinued=1995 |
{{TM500 | mfg=Tektronix | type=TG501 | function=time mark generator | class=pulse generator | image=Tek tg501 on.JPG | introduced=1974 | discontinued=1995 |
designers= |manuals=
manuals=
* [http://w140.com/smb/TG501_SM.pdf Tektronix TG501 Manual (OCR, PDF)]
* [[Media:070-1576-02.pdf|Tektronix TG501 Manual]] (OCR, stitched schematics)
* [[Media:TG501 schematics.pdf|Tektronix TG501 Schematics (stitched, PDF)]]
* [[Media:TG501 schematics.pdf|Tektronix TG501 Schematics, stitched]]
}}
}}
There is also a TG501A.
There is also a TG501A.


Note the [http://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.
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}}
{{BeginSpecs}}
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{{Spec | External Reference Input | 1 MHz, 5 MHz or 10 MHz; TTL compatible (internally hard wired so output frequencies counted down to 1 MHz) }}
{{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}}
{{EndSpecs}}
==Rear Interface Signals==
{| class="wikitable"
|-
! colspan="2" | Connector Pin
! rowspan="2" | Description
|-
! Signal
! Return
|-
| 28A      || 27A || Marker Out (requires front BNC disconnection)
|-
| 27B      || 28B || Trigger Out (requires front BNC disconnection)
|-
| 25A      || 26A || Internal 1 MHz Clock Out (TTL)
|-
| 24B      || 25B || External Clock Input
|-
| 26B      || 22B || Data Good (High when BCD data valid)
|-
| 17A..20A || 22B || bit 4..1 BCD Display data, MSD
|-
| 21A..24A || 22B || bit 4..1 BCD Display data, LSD
|-
| 16A      || 22B || Fast=Low, Slow=High
|}
==Internals==
The TG501 internally produces a 1 MHz reference clock, either from an internal crystal oscillator, or from an externally supplied frequency.
A 100 MHz VCO is phase-locked to this reference frequency (in fixed-frequency mode) or to the output of a variable 1 MHz astable multivibrator (in variable frequency mode).
When the variable oscillator is in use, its frequency is digitally compared to the fixed 1 MHz reference and displayed as a deviation in percent with a pair of LEDs indicating the sign (fast or slow).
A chain of dividers running off the 100 MHz clock provide the selectable output markers.


==Links==
==Links==
* See the [[TG501/Repairs]] page for repair information.
* [https://www.youtube.com/watch?v=U5LQpqwqNIU Tek TG501A Time Mark Gen Restoration] by NFM @ YouTube
* [https://www.youtube.com/watch?v=U5LQpqwqNIU Tek TG501A Time Mark Gen Restoration] by NFM @ YouTube
* See the [[TG501/Repairs]] page for repair information.
* [https://www.youtube.com/watch?v=FIe9WzdIZ9g TG501 Repair and Calibration] by Zenwizard Studios @ YouTube
* [https://www.youtube.com/watch?v=FIe9WzdIZ9g Zenwizard Studios - TG501 Repair and Calibration]
* [https://www.youtube.com/watch?v=rF5V7D0VZeE TG501 In-Depth Troubleshooting of a Stubborn Unit] by Zenwizard Studios @ YouTube
* [https://www.youtube.com/watch?v=rF5V7D0VZeE Zenwizard Studios - TG501 In Depth Troubleshooting of a Stubborn Unit.]


==Pictures==
==Pictures==
===TG501===
<gallery>
Tek tg501 on.JPG          | TG501 early version
Tg 501 late.jpg          | TG501 late version
Tek tg501 internal1.jpg
Tek tg501 internal2.jpg
Tek tg501 internal3.jpg
Tek tg501 internal4.jpg
Tek tg501 internal5.jpg
Tek tg501 internal6.jpg
Tek tg501 internal7.jpg
Tek tg501 early left.jpg  | TG501 early version
Tek tg501 early right.jpg | TG501 early version
Tek tg501 waveform.jpg    | TG501 output waveform
</gallery>
===TG501A===
<gallery>
<gallery>
Tek tg501 on.JPG|TG501 early version
Tek tg501a.jpg
Tg 501 late.jpg|TG501 late version
Tek tg501a.jpg|TG501A
Tek tg501 waveform.jpg |TG501 output waveform
Tek tg501 internal1.jpg|TG501
Tek tg501 internal2.jpg|TG501
Tek tg501 internal3.jpg|TG501
Tek tg501 internal4.jpg|TG501
Tek tg501 internal5.jpg|TG501
Tek tg501 internal6.jpg|TG501
Tek tg501 internal7.jpg|TG501
Tek tg501 early left.jpg|TG501 early version
Tek tg501 early right.jpg|TG501 early version
</gallery>
</gallery>


[[Category:Time mark generators]]
[[Category:Time mark generators]]
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