7A26: Difference between revisions
No edit summary |
mNo edit summary |
||
Line 20: | Line 20: | ||
{{BeginSpecs}} | {{BeginSpecs}} | ||
{{Spec | Bandwidth |200 MHz}} | {{Spec | Bandwidth |200 MHz}} | ||
{{Spec | Input impedance | 1 | {{Spec | Input impedance | 1 MΩ // 22 pF }} | ||
{{Spec | Deflection factor | 5 mV/Div – 5 V/Div in 1–2–5 sequence }} | {{Spec | Deflection factor | 5 mV/Div – 5 V/Div in 1–2–5 sequence }} | ||
{{Spec | Features | Bandwidth limiting switch (20 MHz) }} | {{Spec | Features | Bandwidth limiting switch (20 MHz) }} |
Revision as of 12:06, 5 February 2020
Template:Plugin Sidebar 2 The Tektronix 7A26 is a 200 MHz dual-trace vertical plug-in for 7000-series scopes. Designed by Tom Rousseau, it was the most successful 7000 series plug-ins, with over 120,000 units produced.
The 75 MHz 7A18 and 400 MHz 7A24 share the same front panel layout and operation.
Key Specifications
Bandwidth | 200 MHz |
---|---|
Input impedance | 1 MΩ // 22 pF |
Deflection factor | 5 mV/Div – 5 V/Div in 1–2–5 sequence |
Features | Bandwidth limiting switch (20 MHz) |
Internals
Controls layout and internal construction is very similar to the 75 MHz 7A18. Whereas the 7A18 is a discrete design, the 7A26 uses Tek-made differential amplifier ICs 155-0078-xx.
The 7A26 does not use the ±50 V supplies provided by the mainframe.
Repair issues
The pins of the attenuator modules are connected to the conductive traces on ceramic substrate inside by low-temperature soldering, which can go bad. Re-seating the module can temporarily restore the internal contact but will usually not fix the problem permanently. Repair is possible by opening the click-locked lid and carefully resoldering.
Links
Pictures
-
Front panel
-
left side
-
right side
-
Cartoon in schematic: The 7A26 Sharp Shooter