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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 |
manuals=
manuals=
* [http://w140.com/smb/TG501_SM.pdf Tektronix TG501 Manual (OCR, PDF)]
'''TG501'''
* [[Media:TG501 schematics.pdf|Tektronix TG501 Schematics (stitched, PDF)]]
* [[Media:070-1576-00.pdf|TG501 Manual 070-1576-00]]
* [[Media:070-1576-02.pdf|TG501 Manual 070-1576-02]] (OCR, stitched schematics)
 
* [[Media:050-1425-02.pdf|TG501 Product Mod 050-1425-02]]
* [[Media:TG501 schematics.pdf|TG501 Schematics, stitched]]
 
'''TG501A'''
* [[Media:070-7373-00.pdf|TG501A Manual 070-7373-00]]
}}
}}
* Option 01 adds a 5MHz tempature-compensated crystal oscillator (Y50), and a TTL decade counter (U50) for a stable, precise internal clock.
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.


There is also a TG501A.
{{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}}


==Specifications==
==Rear Interface Signals==
* Markers: 5 s to 1 ns in a 1,2,5 sequence
<small>
* Marker Amplitude (into 50 Ω): ≥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
{| class="wikitable"
* Trigger Output Signal: Slaved to marker output from 5 s through 100 ns. Remains at 100 ns for all faster markers
|-
:{| class="wikitable"
! colspan="2" | Connector Pin
! Internal Reference !! Standard - 1MHZ !! Option:1 - 5 MHz
! 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
|-
|-
| Stability || 1E-5 || 5E-7
| 26B      || 22B || Data Good (High when BCD data valid)
|-
|-
| Long-Term Drift || 1E-5 per month || 1E-7 per month
| 17A..20A || 22B || bit 4..1 BCD Display data, MSD
|-
|-
| Setability || 1E-7 || 5E-9
| 21A..24A || 22B || bit 4..1 BCD Display data, LSD
|-
| 16A      || 22B || Fast=Low, Slow=High
|}
|}
* External Reference Input:  1 MHz; 5 MHz; 10 MHz; TTL compatible (Internally hard wired so output frequencies counted down to 1 MHz)
</small>
* Error Readout Range: to ±7.5%
 
* Error Readout accuracy: One digit (±0.1%-points)
==Internals==
* Net Weight: 1 kg
The TG501 internally produces a 1 MHz reference clock, either from an internal crystal oscillator, or from an externally supplied frequency.
* Dimensions: 66.8 mm × 285.3 mm (d/T) × 125.9 mm (w/d/h)
 
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.
 
The 1 ns output uses a [[step recovery diode]] (HP 5082-8872, part [[152-0503-00]]).
 
==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=FIe9WzdIZ9g TG501 Repair and Calibration] by Zenwizard Studios @ YouTube
* [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=1t7ndiKzYI8 TG501 In-Depth Troubleshooting of a Stubborn Unit Part 2] by Zenwizard Studios @ YouTube
* [https://www.youtube.com/watch?v=yl29OOxyNf0 Tektronix TG501A Refresh and Check For a Viewer] by Zenwizard Studios @ YouTube
{{Documents|Link=TG501}}


==Repair Issues==
==Prices==
* Check for +15 V and adjust if not between 14.3 V and 15.7 V
{| class="wikitable sortable"
* If +5 V is outside 4.94 V − 5.46 V, check U626 (LM741) − old opamps are prone to failure.
|-
* A lot of ICs are placed in non gold plated IC sockets. Contact problems can occur. Removing and inserting ICs helps.
! Year
* A1 board should be mounted to frame only with washers inbetween, especially near the rear connector. Shorts to conductor tracks can occur otherwise.
! 1975
|-
! Catalog Price
| align="right" | $745
|-
! In 2023 Dollars
| align="right" | $4,300
|}


==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
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>
==Parts==
{{Parts|TG501}}
{{Parts|TG501A}}
[[Category:Time mark generators]]
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