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7904: Difference between revisions
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Performance is largely determined by the plug-ins. The [[7A19]] vertical amplifier and [[7B92]] time base were introduced along with the 7904 to match the 500 MHz system bandwidth. | Performance is largely determined by the plug-ins. The [[7A19]] vertical amplifier and [[7B92]] time base were introduced along with the 7904 to match the 500 MHz system bandwidth. | ||
{{BeginSpecs}} | {{BeginSpecs}} | ||
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}} | }} | ||
{{EndSpecs}} | {{EndSpecs}} | ||
===7904A differences=== | |||
The 7904 had an elaborate 5-decade built-in calibrator with variable rate that was dropped from the 7904A. In the 7904A, The Control Illumination switch moved to the rear panel, and the [[7000 series readout system|readout system]] gained a pulsed mode in which it is synchronized with the sweep instead of interrupting the display at random times. This pulsed mode is not compatible with all time base plug-ins (see manual p. 1-12). | |||
==Operation== | ==Operation== | ||
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The 7904 uses a switch-mode power supply and has no fan. It incorporates a 65 ns Y delay line. This delay is too short for some older time bases such as [[7B53]] to display the trigger event. | The 7904 uses a switch-mode power supply and has no fan. It incorporates a 65 ns Y delay line. This delay is too short for some older time bases such as [[7B53]] to display the trigger event. | ||
The 7904 makes extensive use of custom integrated circuits and hybrid circuits, inter alia, the [[155-0064-00]] 470-ps output amplifier, [[155-0022-00]] analog multiplexer for channel switching, [[155-0059-00]] HF amplifier, [[155-0095-01]] and [[155-0095-03]] differential HF amplifiers, and [[155-0067-02]] SMPS controller. | [[Thor Hallen]] designed the main vertical amplifier and the [[7A19]] plugin (Note 1). It used bridged T coils and the "f<sub>t</sub> doubler" circuit patented by [[Carl Battjes]] to achieve its bandwidth. | ||
The 7904 makes extensive use of custom integrated circuits and hybrid circuits, inter alia, the [[155-0064-00]] 470-ps output amplifier, [[155-0022-00]] analog multiplexer for channel switching, [[155-0059-00]] HF amplifier, [[155-0095-01]] and [[155-0095-03]] differential HF amplifiers, and [[155-0067-02]] SMPS controller. | |||
The 7904A includes [[155-0173-05]], [[155-0175-05]] and [[155-0178-05]] amplifiers. | The 7904A includes [[155-0173-05]], [[155-0175-05]] and [[155-0178-05]] amplifiers. | ||