067-0502-01: Difference between revisions

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[[File:Tek 067-0502-01.JPG | thumb | 350px |right]]
[[File:Tek 067-0502-01.JPG | thumb | 350px |right]]
The '''Tektronix 067-0502-01Amplitude Calibrator and Comparator''' is an instrument that can be used to produce a reference rectangle
The '''Tektronix 067-0502-01 Amplitude Calibrator and Comparator''' is an instrument that can be used to produce a reference rectangle
voltage or current waveform and/or to compare an external unknown input with an internal or  
voltage or current waveform and/or to compare an external unknown input with an internal or  
external reference.
external reference. The output voltage is only accurate if terminated in 1 MΩ, the 50 V setting will experience the highest error if not properly terminated (0.5% in an open load).


The comparison is performed using an [[Airpax A175]] chopper to switch
The comparison is performed using an [[Airpax A175]] chopper to switch
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The resulting output is a rectangular waveform  
The resulting output is a rectangular waveform  
with amplitude equal to the difference of two voltages.   
with amplitude equal to the difference of two voltages.   
This waveform can be amplified and viewed on an oscilloscope.
This waveform can be amplified using a drift-free AC amplifier and viewed on an oscilloscope for high sensitivity comparison.


The use of a chopper to make precise DC measurements is a well known and trusted technique,
See the [[067-0502-00]] page for a comparison of the -00 and -01 models.
using instruments that are sensitive to AC, but not capable of drift-free DC performance. 
 
The chopping technique can be used for calibration, comparing a device under test with a reference.
In this case, the result of chopping is viewed on an oscilloscope oscilloscope, possibly
with a preamplifier between the output of the chopper and the input of the oscilloscope.
 
The operator adjusts the device under test to minimize the amplitude observed on the
oscilloscope.  The vertical sensitivity, DC accuracy, and DC drift performance of the
oscilloscope and preamplifier are not critical if the goal is simply to calibrate the device
under test for optimal match with reference.  However, if the objective of the calibration
is to provide assurance that the error is less than some specific value, then the gain of the
preamplifier and oscilloscope matters.  Still, the gain of the preamp and oscilloscope only
affect the accuracy of the tolerance, which is typically around 10%, (e.g., +/- 0.01% or +/- 0.3%).


See the [[067-0502-00]] page for a comparison of the -00 and -01 models.
The HV supply uses a tube V427, to regulate the +300V supply. The manual lists V427 as a [[7734]], a triode-pentode, however some models contain a small circular adapter board (670-1860-00,388-2423-00) to adapt the [[B9A_base|noval tube socket]] to a [[Compactron_base|Compactron socket]] and use a [[6G11]] double pentode instead. The adapter PCB connects the screen grid and plate of the beam power tube together in a triode configuration. These models also have [[6G11]] printed below V427 on the chassis.


It is possible that [[Amplitude comparator|this instrument]] is a prototype of what later became the 067-0502-01.
The output amplitude can be reduced down to 0.2 μV using the [[067-0529-00]] 1000:1 precision divider.


{{MissingSpecs}}
{{BeginSpecs}}
{{Spec | Output Signal | DC+, DC-, Squarewave}}
{{Spec | Amplitude Range | 0.2 mV to 100 V in 1-2-5 sequence, 5mA in current loop}}
{{Spec | Amplitude Accuracy | Within 0.25% into 1 MΩ load}}
{{Spec | Squarewave Repetition Rate | 1 kHz within 20% }}
{{Spec | Maximum Input Voltage | 100 V }}
{{EndSpecs}}


==Manuals==
==Manuals==


* [http://w140.com/tek-067-0502-01.pdf Tektronix 067-0502-01 Manual (PDF)]
* [http://w140.com/tek-067-0502-01.pdf Tektronix 067-0502-01 Manual (PDF)]
* [[Media:062-1105-00.pdf|Tektronix 067-0502-01 Manual (PDF, OCR)]]


==Pictures==
==Pictures==
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Tek 067-0502-01 bottom.jpg|067-0502-01 bottom
Tek 067-0502-01 bottom.jpg|067-0502-01 bottom
Tek 067-0502-01 front.jpg|067-0502-01 front
Tek 067-0502-01 front.jpg|067-0502-01 front
067-0502-01-interior.jpg|067-0502-01 internal view
067-0502-01-interior_det.jpg|067-0502-01 internal detail with 6G11 as V427
</gallery>
</gallery>


[[Category:Calibration fixtures]]
[[Category:Calibration fixtures]]
[[Category:Pulse generators]]
[[Category:Pulse generators]]

Revision as of 06:40, 27 October 2020

The Tektronix 067-0502-01 Amplitude Calibrator and Comparator is an instrument that can be used to produce a reference rectangle voltage or current waveform and/or to compare an external unknown input with an internal or external reference. The output voltage is only accurate if terminated in 1 MΩ, the 50 V setting will experience the highest error if not properly terminated (0.5% in an open load).

The comparison is performed using an Airpax A175 chopper to switch between the two voltages that are being compared. The resulting output is a rectangular waveform with amplitude equal to the difference of two voltages. This waveform can be amplified using a drift-free AC amplifier and viewed on an oscilloscope for high sensitivity comparison.

See the 067-0502-00 page for a comparison of the -00 and -01 models.

The HV supply uses a tube V427, to regulate the +300V supply. The manual lists V427 as a 7734, a triode-pentode, however some models contain a small circular adapter board (670-1860-00,388-2423-00) to adapt the noval tube socket to a Compactron socket and use a 6G11 double pentode instead. The adapter PCB connects the screen grid and plate of the beam power tube together in a triode configuration. These models also have 6G11 printed below V427 on the chassis.

The output amplitude can be reduced down to 0.2 μV using the 067-0529-00 1000:1 precision divider.

Key Specifications

Output Signal DC+, DC-, Squarewave
Amplitude Range 0.2 mV to 100 V in 1-2-5 sequence, 5mA in current loop
Amplitude Accuracy Within 0.25% into 1 MΩ load
Squarewave Repetition Rate 1 kHz within 20%
Maximum Input Voltage 100 V

Manuals

Pictures