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|designers=
|designers=
|manuals=
|manuals=
* [[Media:070-5922-01.pdf|11A32 manual]] (PDF)
* [[Media:070-5922-01.pdf|11A32 Manual]]
* [[Media:070-6782-00.pdf|11A32 Service Reference]] (PDF)
* [[Media:070-6782-00.pdf|11A32 Service Reference]]  
* [[Media:070-7388-99.pdf|11A32 Extended Service Manual]] (PDF, OCR, with schematics)
* [[Media:070-7388-99.pdf|11A32 Extended Service Manual]] (OCR, with schematics)
* [[Media:Tektronix 11k plugin NVRAM replacement.pdf|Tektronix 11k Plug-in NVRAM Replacement (PDF)]]
* [[Media:Tektronix 11k plugin NVRAM replacement.pdf|Tektronix 11k Plug-in NVRAM Replacement]]
* [[Media:061-3381-00.pdf|Tektronix 11A32 Preliminary Service Manual (PDF)]]
* [[Media:061-3381-00.pdf|Tektronix 11A32 Preliminary Service Manual]]]
}}
}}
The '''Tektronix 11A32''' is a 400 MHz dual-channel amplifier plug-in for [[11000-series scopes]].
The '''Tektronix 11A32''' is a 400 MHz dual-channel amplifier plug-in for [[11000-series scopes]] and DSA600-series scopes.
Each of the attenuator modules contains an [[M474]] buffer amplifier.
Each of the attenuator modules feeds an [[M377]] amplifier IC.
The output signals of the two M377s combine at the output of the 11A32.
Only one M377 has its main output enabled at a time.
The fine steps between the deflection ranges are calibrated in 1% increments.
 
The 11A32 uses the same firmware as the [[11A34]].


{{BeginSpecs}}
{{BeginSpecs}}
{{Spec | Bandwidth | DC to 400 MHz plus 100 MHz and 20 MHz BWL filters }}
{{Spec | Bandwidth | DC to 400 MHz.  100 MHz and 20 MHz four pole BWL (Bandwidth Limit) filters may be selected.}}
{{Spec | Number of Inputs | 2 }}
{{Spec | Rise time | 875 ps in 1 GHz mainframes such as the [[11402]], [[11402|11402A]], [[11403]], [[11403|11403A]], [[DSA600|DSA601A]], or [[DSA600|DSA602A]]}}
{{Spec | Rise time | 875 ps 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 per division in 1% calibrated steps}}
{{Spec | Deflection | 1 mV to 10V per division in 1% calibrated steps}}
{{Spec | Input impedance | 50 Ω or 1 MΩ }}
{{Spec | Input impedance | 50 Ω or 1 MΩ }}
{{Spec | Features |
{{Spec | Features |
*High-Resolution Calibrated DC Offset
* High-resolution calibrated DC offset
*Fast Overdrive Recovery
* Fast overdrive recovery
*50 Ω mode 5V RMS overload protected with manual reset
* 5 V<sub>RMS</sub> overload protection in 50 Ω mode, with manual reset
}}
}}
{{EndSpecs}}
{{EndSpecs}}


==Internals==
==Internals==
The 11A32 uses an 8052 microcontroller and a DS1120 NVRAM.
===Analog===
It contains an [[ACVS]] sample and hold module.
Each input channel has a separate attenuator module, part number [[119-2000-0x]],
containing passive 1 megohm attenuators, a 50 ohm termination resistor, an AC coupling capacitor,
a switch selecting the calibrator or signal input, and an [[M474]] buffer amplifier. 
In normal operation the calibrator signal to the attenuator is instead connected to ground.
 
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 two 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 two amplifiers.
 
The version of the M377 used in the 11A32 has a 100 Ω output impedance per side so that two of them in parallel
create a source impedance of 50 Ω per side.
 
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 two 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
|-
|}
See also the block diagram below.
 
===Digital===
The 11A32 and the [[11A34]] use exactly the same firmware.
 
The [[11A34]] and 11A32 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 11A32 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 is also an [[ACVS]] (Analog Control Voltage System) sample and hold module on a daughter board that generates 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 normal or invert state.
 
Digital mainframes do waveform manipulation (addition, subtraction, multiplication, etc.).  Consequently only one 11A32 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==
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Tek 11a32.jpg
Tek 11a32.jpg
Tek 11a32 2.jpg
Tek 11a32 2.jpg
Tektronix 11A32 schematic pg 2 stitch.jpg|11A32 Main Board Schematic
Tek 11a32 block diagram.png|Block diagram
Tek 11a32 input attenuators.jpg|11A32 Input Attenuators
Tek 11a32 kernel.jpg|11A32 Kernel
Tek 11a32 analog control and signal amplifiers.jpg|11A32 Analog Control and Signal Amplifiers
Tektronix 11A32 schematic pg 4.jpg|11A32 Main Interface
Tektronix 11A32 schematic pg 4.jpg|11A32 Main Interface
Tek 11a32 internal1.jpg|left side internal
Tek 11a32 internal1.jpg|left side internal
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/79315...80191"

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