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11A34 (view source)

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{{Plugin Sidebar 2 |
{{Plugin Sidebar  
title=Tektronix 11A34 |
|manufacturer=Tektronix
summary=Quad channel 300 MHz amplifier |
|series=11000-series scopes
image=11a34 front.jpg |
|type=11A34  
caption=Tek 11A34 |
|summary=Quad channel 300 MHz amplifier  
series=[[11000-series scopes]] |
|image=11a34 front.jpg  
introduced=1987 |
|caption=Tek 11A34  
discontinued=(?) |
|introduced=1987  
manuals=
|discontinued=(?)  
* [http://w140.com/tek_11a34_user.pdf Tektronix 11A34 User Manual (PDF)]
|designers=Murlan Kaufman
* [http://w140.com/Tek11A34-service.pdf Tektronix 11A34 Service Manual (PDF)]
|manuals=
* [[Media:070-5921-01.pdf|Tektronix 11A34 User Reference -01]]
* [[Media:070-5921-00.pdf|Tektronix 11A34 User Reference -00]]
* [[Media:070-6785-00.pdf|Tektronix 11A34 Service Manual]]
* [[Media:070-7389-99.pdf|Tektronix 11A34 Extended Service Manual]]
* [[Media:Tektronix 11k plugin NVRAM replacement.pdf|Tektronix 11k Plug-in NVRAM Replacement]]
}}
}}
The '''Tektronix 11A34''' is a four-channel vertical amplifier plug-in for [[11000-series_scopes|11000-series]] and DSA600-series scopes.
The '''Tektronix 11A34''' is a four-channel vertical amplifier plug-in for [[11000-series_scopes|11000-series]] and DSA600-series scopes.
It uses the [[M377]] amplifier chip.


Option 23 added four [[P6134]] probes.
Option 23 added four [[P6134]] probes.


There is also a later version, the 11A34V introduced in 1991, for video applications.  (See also [[11T5H]].) ''more Information needed''  
There is also a version for video applications, the 11A34V, that was introduced in 1991 (see also [[11T5H]]).
It differs from the 11A34 only in its input impedance (75 ohms). Development of the 11A34V was managed by [[Murlan Kaufman]].
: ''more information about 11A34V needed''


{{BeginSpecs}}
{{BeginSpecs}}
{{Spec | Bandwidth | 300 MHz }}
{{Spec | Bandwidth | DC to 300 MHz.  100 MHz and 20 MHz four pole BWL (Bandwidth Limit) filters may be selected.}}
{{Spec | Input impedance | switchable between 50 Ω and 1 MΩ (11A34V: 75 Ω / 1 MΩ) }}
{{Spec | Rise time | 1.2 ns in 1 GHz mainframe such as the [[11402]], [[11402|11402A]], [[11403]], [[11403|11403A]], [[DSA600|DSA601A]], or [[DSA600|DSA602A]] }}
{{Spec | Deflection | 1 mV to 10 V/div in 1% calibrated steps}}
{{Spec | Input impedance | 50 Ω or 1 MΩ }}
{{Spec | Features |
* High-resolution calibrated DC offset
* Fast overdrive recovery
* 5 V<sub>RMS</sub> input overload protection in 50 Ω mode, with manual reset
}}
{{EndSpecs}}
{{EndSpecs}}


[[Category:Specifications needed]] ''please add''  
==Internals==
===Analog===
Each input channel has a separate attenuator module containing passive 1 megohm attenuators, an AC coupling capacitor, a switch selecting the calibrator or signal input and an [[M474]] buffer amplifier. The calibrator signal turned off inside the plugin when not in use.
 
The attenuator module output feeds the + input of the [[M377]] amplifier IC through a (blue) 50 ohm transmission line, one per input channel.  The cable lengths set a standard delay per plugin.
 
 
The M377's - input is connected to the [[ACVS]] (Analog Control Voltage System) output.
 
The (differential) display outputs of the four amplifiers are hard-wired in parallel and drive the mainframe’s
50 Ω per side input impedance.  The same is true of the trigger outputs of the four amplifiers.
 
The version of the M377 used in the 11A34 has a 200 Ω output impedance per side so that four of them in parallel
create a source impedance of 50 Ω.
 
Each M377 amplifier's nominal common-mode output voltage is zero whether enabled or not. When not enabled, each M377
differential output is exactly zero by design. This fact is used during calibration by the plugin’s firmware to
determine the mainframe’s imbalance and compensate for it during normal operation.
 
Each of the four channels has its own AUX output on dedicated pins of the plug-in interface connector:
 
{| class="wikitable" style="margin:auto"
|-
! signal name !! positive pin number !! negative pin number
|-
| AUX 1 || B38 || B37
|-
| AUX 2 || A36 || A35
|-
| AUX 3 || B32 || B33
|-
| AUX 4 || A32 || A31
|}
 
The AUX signals emerge from each M377 amplifier as differential signal with a 200 Ω source impedance per side.
External (on the circuit board) 66.5 Ω shunt resistors on each AUX output bring this down to the 50 Ω source
impedance specified by the 11k plug-in interface.
 
See also the block diagram below.
 
===Digital===
The 11A34 and the [[11A32]] use exactly the same firmware.
 
The [[11A32]] and 11A34 were originally intended to use [[Intel 8052]] microcontrollers.
However, during development, the firmware swelled beyond that chip's 8192-byte maximum on-chip
ROM size.  [[Doug Haines]] found an alternate supplier of 8051-compatible chips (OKI Semiconductor)
that offered a 16Kbyte on-chip ROM, and that's what the plug-ins wound up with. The finished code size wound up at about 14 KB.
 
The 11A34 also contains a Dallas Semiconductor DS1220Y NVRAM storing last settings, calibration constants, and instrument serial number. 
The DS1220Y contains a battery with a typical life time of 20-30 years. 
 
There are also two [[ACVS]] (Analog Control Voltage System) sample and hold modules on two daughter boards that generate the analog voltages needed for gain and offset, including error correction
under microcontroller firmware control. 
 
The microcontroller also provides the digital signals sent to the M377 amplifier, setting one of its six fixed gains, one of its three bandwidths, turning on or off its selected output, and each output's + up or invert state.
 
Digital mainframes do waveform manipulation (addition, subtraction, multiplication, etc.).  Consequently only one 11A34 output is on at a time.  Analog mainframes however allow more than one channel to be on at a time.  This allows the plugin channels to be added or subtracted in the plugin.


==Links==
==Links==
Line 31: Line 101:
==Pictures==
==Pictures==
<gallery>
<gallery>
Tek 11a34 front.jpg | 11A34 front view
11a34_front.jpg|front view
11a34_front.jpg|front view
11a34_left2.jpg|left side view
11a34_left2.jpg|left side view
11a34_right.jpg|right side view
11a34_right.jpg|right side view
11a34_bottom.jpg|bottom view
11a34_bottom.jpg|bottom view
Tek 11a34 block diagram.png|Block diagram
Tek 11a34 input attenuators.jpg|Input Attenuators
Tek 11a34 kernel.jpg|Kernel
Tek 11A34 analog control and signal amplifiers.png|Analog Control and Signal Amplifiers
Tek 11a34 main interface.jpg|Main Interface
Tek_11a34v_and_11t5h.jpg|11A34V and 11T5H
Tek_11a34v_and_11t5h.jpg|11A34V and 11T5H
Tek_11a34v_and_11t5h_2.jpg|11A34V and 11T5H
Tek_11a34v_and_11t5h_2.jpg|11A34V and 11T5H
Line 41: Line 117:
Early 11a34 left internal front.jpg|Prototype 11A34
Early 11a34 left internal front.jpg|Prototype 11A34
Early 11a34 right internal.jpg|Prototype 11A34
Early 11a34 right internal.jpg|Prototype 11A34
Tek 11a34v front.jpg|11A34V front
Tek 11a34v rear.jpg|11A34V rear
Tek 11a34v left internal.jpg|11A34V left internal
Tek 11a34v right internal.jpg|11A34V right internal
Tek 11a34 left open.jpg|11A34
</gallery>
</gallery>
{{Custom ICs|11A34}}


[[Category:11000 series plugins]]
[[Category:11000 series plugins]]
[[Category:Tekprobe BNC]]
[[Category:Tekprobe BNC]]
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/24983...79565"

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