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7A19: Difference between revisions
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The 7A19 is a one-channel vertical plug-in for [[7000-series scopes]]. | The 7A19 is a one-channel vertical plug-in for [[7000-series scopes]]. | ||
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. | 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. | ||
==Specifications== | ==Specifications== | ||
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{{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}} | ||
==Internals== | |||
The 7A19 uses the [[155-0068-00]] amplifier IC. | |||
==Pictures== | ==Pictures== | ||
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===Earlier model === | ===Earlier model === | ||
<gallery> | <gallery> | ||
File:7a19-early-left.jpg | Left side (early model with Weinschel attenuator) | File:7a19-early-left.jpg | Left side (early model with Weinschel attenuator, without Opt. 4) | ||
File:7a19-early-right.jpg | Right side (early model with Weinschel attenuator) | File:7a19-early-right.jpg | Right side (early model with Weinschel attenuator) | ||
</gallery> | </gallery> | ||