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TU-4: Difference between revisions
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When the TU-4 is properly calibrated, the RIPPLE AND PERCENT DC ERROR connector output delivers 10 mV for each 1% error of the the power supply in the scope. This output has a 1 MΩ source impedance and is designed to drive a 1 MΩ scope input. Thus, monitoring this voltage using a modern DVM will exaggerate any error by a factor of about 1.8. There is a button to filter the ripple from this output, and another button to ground the output, to provide an accurate ground reference. While development of the TU-4 was stopped rather early, due to the difficulty of getting it to work correctly with all the members of the 560 family, it remains useful for doing quick checks of voltage and ripple. | When the TU-4 is properly calibrated, the RIPPLE AND PERCENT DC ERROR connector output delivers 10 mV for each 1% error of the the power supply in the scope. This output has a 1 MΩ source impedance and is designed to drive a 1 MΩ scope input. Thus, monitoring this voltage using a modern DVM will exaggerate any error by a factor of about 1.8. There is a button to filter the ripple from this output, and another button to ground the output, to provide an accurate ground reference. While development of the TU-4 was stopped rather early, due to the difficulty of getting it to work correctly with all the members of the 560 family, it remains useful for doing quick checks of voltage and ripple. | ||
The SIGNAL INPUT connector drives the vertical deflection plates directly, with no amplification. Connecting a 20 V calibrator signal to this input should produce a square wave | The SIGNAL INPUT connector drives the vertical deflection plates directly, with no amplification. Connecting a 20 V calibrator signal to this input should produce a square wave about 2 cm high. Moving the toggle switch to the DUAL TRACE position should produce two traces about two major divisions apart. If this calibrator signal is also connected to the Z AXIS INPUT, this should reduce the intensity of the leading edge(s) of the square wave(s). | ||
Note that some of the photos on this page show a TU-4 with BNC connectors instead of UHF connectors. That change was scheduled to start at SN 300, but production ended before this upgrade could be implemented. The UHF connectors, but not the binding post, were scheduled to be changed. | |||
One of the small black knobs on this upgraded unit is also incorrect; all three small knobs should be the same. | |||
Note that some of the photos on this page show a TU-4 with BNC connectors instead of UHF connectors. That | |||
One of the small black knobs on this unit is also incorrect; all three small knobs should be the same. | |||
While the BNC connectors are a welcome improvement, the TU-4 with BNCs shown on this page must have been upgraded after it was sold. | While the BNC connectors are a welcome improvement, the TU-4 with BNCs shown on this page must have been upgraded after it was sold. | ||
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<gallery> | <gallery> | ||
Tek_tu4_front_cropped.jpg|Front w/UHF connectors | Tek_tu4_front_cropped.jpg|Front w/UHF connectors | ||
Tek tu-4 front.jpg|Front w/BNCs | Tek tu-4 front.jpg|Front w/BNCs | ||
Tek tu4 left.jpg|Left | Tek tu4 left.jpg|Left | ||