P6046: Difference between revisions

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[[Image:Tek P6046 catalog 2.jpg|350px|thumb|right|Tektronix P6046 Differential Probe and 015-0106-00 Amplifier]]
{{Probe Sidebar
The '''Tektronix P6046''' is a 45/100 MHz differential probe oscilloscope probe.
|manufacturer=Tektronix
It was initially intended for use with a [[1A5]], to which it attaches through a 9-pin [[Amphenol 165 series connector]].
|model=P6046
|summary=100 MHz differential probe
|image=Tek P6046 catalog 2.jpg
|caption=Tektronix P6046 Differential Probe and 015-0106-00 Amplifier
|for=50 Ω scope inputs
|introduced=1968
|discontinued=1992
|designers=Glenn Bateman
|manuals=
There are three versions of the manual:
* [[Media:070-0756-00.pdf|070-0756-00 - 1968]] − assumes [[1A5]] for absolute gain calibration
* [[Media:070-7129-00.pdf|070-7129-00 - 1988]]
* [[Media:070-7129-01.pdf|070-7129-01 - 1992]]


A separate amplifier (015-0106-00) was available as an option to use the probe on a 50 Ω input scope set at 10 mV/Div.
* [[Media:P6046 Voltage and Waveform Information.pdf|P6046 Voltage and Waveform Information]]
* [[Media:P6046 Schematics Rev. C June 1977 11x17.pdf|P6046 Schematics Rev. C June 1977]]


With a 1A5, the P6046 has a 45 MHz bandwidth. The raw bandwidth of the probe and amplifier is 100 MHz.
* [[Media:Tek p6046 eis signature page.pdf|P6046 Engineering Instrument Specification Signature Page]]
Note that the probe itself acts as either a 1× or 10× attenuation probe dependent on a signal
* [[Media:Tek p6046 fcp march 1968.pdf|P6046 Factory Calibration Procedure, March 1968]]
voltage on pin D of the connector. When used with the amplifier, 10× mode is used in the
}}
200, 100, and 50 mV/DIV settings and 1× mode for 20, 10, 5, 2, and 1 mV/DIV.
The '''Tektronix P6046''' is a 100 MHz differential probe oscilloscope probe [[introduced in 1968]] and discontinued sometime after 1992.
It was designed by [[Glenn Bateman]].


An additional  ×10 attenuator (010-0361-00) can be plugged onto the P6046's inputs.
It was initially intended for use with a [[1A5|1A5 plug-in]], to which it attaches through a 9-pin [[Amphenol 165 series connector]].


==Operation==
A separate amplifier (015-0106-00) was available as an option to use the probe on a 50 Ω input scope set at 10 mV/Div.


Ground the probe!  Seriously.  Sticker the probe "Ground Me!"  The two probe tips are
An additional ×10 attenuator (010-0361-00) can be plugged onto the P6046's inputs.
(in DC mode) directly connected to the gates of a pair of JFETs.  Use the shorting plugs
on the tips when not in use.  I also recommend stickering the probe amplifier with the
ATTEN BAL setup proceedure from section 2-6 of the manual.


==Repair Issues==
Note that the probe itself acts as either a 1× or 10× attenuation probe dependent on a signal voltage on pin D of the connector. 
When used with the amplifier, 10× mode is used in the 200, 100, and 50 mV/div settings and 1× mode for 20, 10, 5, 2, and 1 mV/div.


Pay attention to the maintenance section of the manual about the operation of
{{BeginSpecs}}
the P6046 outside its housing.  The bottom section of housing ties the circuit
{{Spec | Bandwidth | 45 MHz with 1A5; 100 MHz with amplifier; AC low frequency cut-off 20 Hz (2 Hz with ×10 head) }}
grounds together.  The schematic diagram calls out four different grounds:  The cable
{{Spec | Input impedance | 1 MΩ // 10 pF (with ×10 head, 10 MΩ // 3 pF) }}
(using the three line earth symbol), the front posts (triangle-1), the middle mounting
{{Spec | Common-mode range | ±5 V DC+peak AC up to 10 MHz, decreasing to ±2 V at 50 MHz }}
screw (triangle-2) and the rear posts (triangle-3).  When operating the probe without
{{Spec | Maximum Allowable Input | 25 V total DC+peak AC, 25 V total difference between + and − input tips }}
the top housing, reattach a front and rear post screw to hold the board down to the
lower housing.  When operating the probe with no housings, tie a front and a rear post
together with a jumper.  The center circuit board mounting screw ground is only used
for the high frequency CMRR adjustments and none of those will work without both
housings in place.


The input FETs must be a matched pair.  A possible replacement is the 2N4416A in a metal
{{EndSpecs}}
TO-72 package with the substrate pin provided as in the factory part 153-0559-00.  It is
pretty expensive; currently (2014) it's about $6 US dollars each.
Another much cheaper replacement is the 2N3819 in a plastic TO-92 package.
The matching criteria should be Idss.


If the "DRAIN VOLTS" adjustment step (R125) fails, check and replace R124.  It is a 270K,
==Operation==
1/10W carbon composition resistor and it will eventually drift high so the 10.5V drain voltage
can not be reached.  The calibration section is not clear about the settings for this
measurement, but the schematic diagram shows the voltage measured with 200 mV/DIV set
on the amplifier.
 
==Calibration==
 
<blockquote>
The Tektronix P-6046 is excellent, and usually quite inexpensive because nobody knows what it is.
Make sure it works when you buy it, because these probes are extraordinarily tricky to trim up for CMRR after repair.
  -- [[Jim Williams]], ''The Art of Analog Circuit Design''
</blockquote>
 
Newer versions of the probe have plastic plugs that allow access to the following adjustments
 
* R209 - 42 MHz CM balance
* C209 - 18 MHz CM balance (and drain voltage measurement)
* C245 - 50 MHz CM balance
* R155 - Gain
 
The full calibration shield has access to all ten adjustments.  You will need
to make this by drilling holes in a housing.  The full shield is needed to
recalibrate a probe after replacing the input fets.  Some used probes will
be found with an access hole drilled for R235 (GAIN SWITCHING BALANCE) since this
is adjusted to remove the trace shift when the probe switches from 1× to 10× mode.
 
To calibrate the amplifier, first check the power supply voltages.  They are floating.
Do not check with respect to ground!  When adjusting, watch for exposed line voltage
in the power supply, especially the fuse holder.  The power supply must be adjusted
with everything connected together.  Note that you can check the voltages from the
back of the amplifier output board.
 
==Manuals==
 
* [[Media:Tek p6046 fcp march 1968.pdf]]
 
There are three versions of the manual


* [[Media:070-0756-00.pdf|070-0756-00 - (C) 1968]]
The two probe tips are (in DC mode) directly connected to the gates of a pair of JFETs.
* [[Media:070-7129-00.pdf|070-7129-00 - (C) 1988]]
* [[Media:070-7129-00.pdf|070-7129-01 - (C) 1992]]
The 1968 version assumes you have a [[1A5]] for absolute gain calibration of the probe
without the amplifier.


* [http://w140.com/Tektronix_P6046_Instruction_Manual.pdf P6046 Manual (no schematics, PDF)]
Use the shorting plugs on the tips when not in use:
* [http://w140.com/Tek_P6046_Differential_Probe-Operation_Manual.pdf P6046 Detailed Manual (no schematics, PDF)]
<blockquote>Ground the probe!  Seriously. Sticker the probe "Ground Me!"  I also recommend stickering the probe amplifier with the ATTEN BAL setup procedure from section 2-6 of the manual.</blockquote>
* [http://w140.com/P6046_8.5x11.pdf P6046 Voltage and Waveform Information (PDF)]
* [http://w140.com/P6046_17x11.pdf P6046 Schematics (PDF)]
* [[Media:Tek p6046 eis signature page.pdf|P6046 Engineering Instrument Specification Signature Page (PDF)]]


==Links==
==Links==
* [http://www.i9t.net/p6046/p6046.html P6046 @ iceNINE Tech]
* [http://www.i9t.net/p6046/p6046.html P6046 @ iceNINE Tech]
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/P6046.htm P6046 @ amplifier.cd]
* [https://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/P6046.htm P6046 @ amplifier.cd]
{{Documents|Link=P6046}}


==Pictures==
==Pictures==
<gallery>
<gallery>
P6046_1.jpg | P6046
P6046_2.jpg | P6046
Tek p6046 internal1.jpg
Tek p6046 internal1.jpg
Tek p6046 internal2.jpg
Tek p6046 internal2.jpg
Line 102: Line 63:
</gallery>
</gallery>


[[Category:Differential Oscilloscope Probes]]
[[Category:Differential oscilloscope probes]]
[[Category:Differential amplifiers]]

Latest revision as of 05:14, 28 January 2024

Tektronix P6046
100 MHz differential probe
Tektronix P6046 Differential Probe and 015-0106-00 Amplifier

Compatible with 50 Ω scope inputs

Produced from 1968 to 1992

Manuals


Manuals – Specifications – Links – Pictures

The Tektronix P6046 is a 100 MHz differential probe oscilloscope probe introduced in 1968 and discontinued sometime after 1992. It was designed by Glenn Bateman.

It was initially intended for use with a 1A5 plug-in, to which it attaches through a 9-pin Amphenol 165 series connector.

A separate amplifier (015-0106-00) was available as an option to use the probe on a 50 Ω input scope set at 10 mV/Div.

An additional ×10 attenuator (010-0361-00) can be plugged onto the P6046's inputs.

Note that the probe itself acts as either a 1× or 10× attenuation probe dependent on a signal voltage on pin D of the connector. When used with the amplifier, 10× mode is used in the 200, 100, and 50 mV/div settings and 1× mode for 20, 10, 5, 2, and 1 mV/div.

Key Specifications

Bandwidth 45 MHz with 1A5; 100 MHz with amplifier; AC low frequency cut-off 20 Hz (2 Hz with ×10 head)
Input impedance 1 MΩ // 10 pF (with ×10 head, 10 MΩ // 3 pF)
Common-mode range ±5 V DC+peak AC up to 10 MHz, decreasing to ±2 V at 50 MHz
Maximum Allowable Input 25 V total DC+peak AC, 25 V total difference between + and − input tips

Operation

The two probe tips are (in DC mode) directly connected to the gates of a pair of JFETs.

Use the shorting plugs on the tips when not in use:

Ground the probe! Seriously. Sticker the probe "Ground Me!" I also recommend stickering the probe amplifier with the ATTEN BAL setup procedure from section 2-6 of the manual.

Links

Documents Referencing P6046

Document Class Title Authors Year Links
Service Scope 46 Oct 1967.pdf Article P6046 DC-to-100 MHz Differential Probe and Amplifier Glenn Bateman 1967 P6046
Tekscope 1972 V4 N5 Sep 1972.pdf Article A Practical Approach to Differential Amplifiers and Measurements Fred Beckett 1972 112 • 11A33 • 1A5 • 1A6 • 1A7 • 1A7A • 26A2 • 3A9 • 5A22N • 7A13 • 7A22 • AM502 • D • E • G • P6055 • P6046 • W • Z
Tekscope 1972 V4 N6 Nov 1972.pdf Article Differential Amplifiers and Measurements, Part 2 Fred Beckett 1972 112 • 11A33 • 1A5 • 1A6 • 1A7 • 1A7A • 26A2 • 3A9 • 5A22N • 7A13 • 7A22 • AM502 • D • E • G • P6055 • P6046 • W • Z

Pictures

  • P6046

    P6046

  • P6046

    P6046

  • 015-0106-00 amplifier and power supply

    015-0106-00 amplifier and power supply

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