7A19: Difference between revisions

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===Later model (B030000+)===
===Later model (B030000+)===
<gallery>
<gallery>
File:Tek 7a19 left.jpg | Left side (Opt.4 delay line enclosure in front)
Tek 7a19 left.jpg | Left side (Opt.4 delay line enclosure in front)
File:Tek 7a19 right.jpg | Right side
Tek 7a19 right.jpg | Right side
File:Tek 7a19 frontright.jpg | Front right, Tek-built attenuator
Tek 7a19 frontright.jpg | Front right, Tek-built attenuator
File:Tek 7a19 rearright.jpg | Rear right
Tek 7a19 rearright.jpg | Rear right
File:Tek 7a19 frontleft.jpg |Front left
Tek 7a19 frontleft.jpg |Front left
File:Tek 7a19 rearleft.jpg | Front right
Tek 7a19 rearleft.jpg | Front right
File:Tek 7a19 top.jpg | Top view
Tek 7a19 top.jpg | Top view
File:Tek 7a19 att sw1.jpg | Attenuator switch contacts
Tek 7a19 att sw1.jpg | Attenuator switch contacts
File:Tek 7a19 att sw2.jpg | Contacts detail
Tek 7a19 att 1.jpg | Attenuator element
Tek 7a19 att 2.jpg | Attenuator element
Tek 7a19 att sw2.jpg | Contacts detail
File:Tek 7a19 att sw3.jpg | Contacts detail
File:Tek 7a19 att sw3.jpg | Contacts detail
</gallery>
</gallery>

Revision as of 01:08, 15 March 2017

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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).

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.

Key Specifications

Input impedance 50 Ω
Bandwidth 600 MHz (500 MHz in 7904)
Deflection 10 mV/Div to 1 V/Div, 1—2—5 sequence. Pre-charge circuit may be used as a calibrated ×100 attenuator.
Maximum input 2 W average or 50 Div, in AC mode 100 V DC+peak AC
Variable delay (Opt.4) -0.5 ns to +0.5 ns

Internals

The 7A19 uses the 155-0068-00 amplifier IC.

Notes

  1. See 7A11 and John Addis, Good Engineering and Fast Vertical Amplifiers, in Jim Williams (Ed.), Analog Circuit Design: Art, Science and Personalities (1991), p.114, and Tektronix New Products 1972 brochure.

Pictures

Earlier model

Later model (B030000+)