The Tektronix TG501 is a time-mark generator plug-in for the TM500 system.
There is also a TG501A.
Note the output must be terminated into 50 Ω or there may be no signal at all.
|Interval||1 ns to 5 s in 1−2−5 sequence|
|Timing accuracy||Stability 1×10-5, long-term drift 1×10-5 per month (with Option 1, 5×10-7 / 1×10-7 per month)|
|Error Readout||Accuracy 1 digit (±0.1% points), Range to ±7.5%|
|Amplitude||≥1 V peak on 5 s through 10 ns; ≥750 mVp-p on 5 ns and 2 ns; ≥200 mVp-p on 1 ns (separate output) (all into 50 Ω)|
|Trigger Output||Slaved to marker output from 5 s through 100 ns. Remains at 100 ns for all faster markers|
|External Reference Input||1 MHz, 5 MHz or 10 MHz; TTL compatible (internally hard wired so output frequencies counted down to 1 MHz)|
Rear Interface Signals
|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|
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.
- See the TG501/Repairs page for repair information.
- Tek TG501A Time Mark Gen Restoration by NFM @ YouTube
- TG501 Repair and Calibration by Zenwizard Studios @ YouTube
- TG501 In-Depth Troubleshooting of a Stubborn Unit by Zenwizard Studios @ YouTube
- TG501 In-Depth Troubleshooting of a Stubborn Unit Part 2 by Zenwizard Studios @ YouTube