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7A19: Difference between revisions
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The '''Tektronix 7A19''' is a one-channel 600 MHz vertical amplifier plug-in for [[7000-series scopes]], designed by [[Thor Hallen]] and introduced along with the [[7904]] mainframe in late 1971/early 1972 (note 1). | The '''Tektronix 7A19''' is a one-channel 600 MHz vertical amplifier plug-in for [[7000-series scopes]], designed by [[Thor Hallen]] and introduced along with the [[7904]] mainframe in late 1971/early 1972 (note 1). | ||
{{BeginSpecs}} | {{BeginSpecs}} | ||
{{Spec | Bandwidth | 600 MHz (500 MHz in [[7904]]) }} | {{Spec | Bandwidth | 600 MHz (500 MHz in [[7904]]) }} | ||
{{Spec | Deflection | 10 mV/Div to 1 V/Div, 1−2−5. Pre-charge circuit may be used as a calibrated ×100 attenuator. }} | {{Spec | Deflection | 10 mV/Div to 1 V/Div, 1−2−5. Pre-charge circuit may be used as a calibrated ×100 attenuator. }} | ||
{{Spec | Maximum input | 2 W average or 50 Div, in AC mode 100 V DC+peak AC }} | {{Spec | Maximum input | 2 W average or 50 Div, in AC mode 100 V DC+peak AC }} | ||
{{Spec | Input impedance | 50 Ω }} | |||
{{Spec | Variable delay (Opt.4) | −0.5 ns to +0.5 ns}} | {{Spec | Variable delay (Opt.4) | −0.5 ns to +0.5 ns}} | ||
{{EndSpecs}} | {{EndSpecs}} | ||
==Operation== | |||
The 7A19 has no variable gain control. An option (#4) was available that added a variable signal delay (±0.5 ns implemented using a mechanically variable passive delay line), intended to match timing between multiple channels. | |||
The pre-charge setting on the input coupling switch is intended for situations where there might be residual charge on the input coupling capacitor that could overload the input. To use it, one sets the switch to PRE-CHG before connecting the input signal, then waits two seconds before switching to AC (LF point is 1 kHz). The PRE-CHG setting also serves as a ×100 attenuator having a 5 kΩ input impedance in series with 2 μF, extending LF cutoff down to 20 Hz. In the AC GND position, the input is disconnected from the amplifier and terminated in a capacitively coupled 50 Ω load. | |||
==Internals== | ==Internals== | ||