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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]] |
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| 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]] |
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| 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
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| 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]]. |
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| 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]]. |
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| ==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. |
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| 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
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| ATTEN BAL setup proceedure from section 2-6 of the manual.
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| ==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. |
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| 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
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| lower housing. When operating the probe with no housings, tie a front and a rear post
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| together with a jumper. The center circuit board mounting screw ground is only used
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| for the high frequency CMRR adjustments and none of those will work without both
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| housings in place.
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| 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
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| pretty expensive; currently (2014) it's about $6 US dollars each.
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| Another much cheaper replacement is the 2N3819 in a plastic TO-92 package.
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| The matching criteria should be Idss.
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| 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
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| can not be reached. The calibration section is not clear about the settings for this
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| measurement, but the schematic diagram shows the voltage measured with 200 mV/DIV set
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| on the amplifier.
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| ==Calibration== | |
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| <blockquote>
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| The Tektronix P-6046 is excellent, and usually quite inexpensive because nobody knows what it is.
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| Make sure it works when you buy it, because these probes are extraordinarily tricky to trim up for CMRR after repair.
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| -- [[Jim Williams]], ''The Art of Analog Circuit Design''
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| </blockquote>
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| Newer versions of the probe have plastic plugs that allow access to the following adjustments
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| * R209 - 42 MHz CM balance
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| * C209 - 18 MHz CM balance (and drain voltage measurement)
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| * C245 - 50 MHz CM balance
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| * R155 - Gain
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| The full calibration shield has access to all ten adjustments. You will need
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| to make this by drilling holes in a housing. The full shield is needed to
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| recalibrate a probe after replacing the input fets. Some used probes will
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| be found with an access hole drilled for R235 (GAIN SWITCHING BALANCE) since this
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| is adjusted to remove the trace shift when the probe switches from 1× to 10× mode.
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| To calibrate the amplifier, first check the power supply voltages. They are floating.
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| Do not check with respect to ground! When adjusting, watch for exposed line voltage
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| in the power supply, especially the fuse holder. The power supply must be adjusted
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| with everything connected together. Note that you can check the voltages from the
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| back of the amplifier output board.
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| ==Manuals==
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| * [[Media:Tek p6046 fcp march 1968.pdf]]
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| There are three versions of the manual
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| * [[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]]
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| * [[Media:070-7129-00.pdf|070-7129-01 - (C) 1992]]
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| The 1968 version assumes you have a [[1A5]] for absolute gain calibration of the probe
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| without the amplifier.
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| * [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)]
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| * [http://w140.com/P6046_17x11.pdf P6046 Schematics (PDF)]
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| * [[Media:Tek p6046 eis signature page.pdf|P6046 Engineering Instrument Specification Signature Page (PDF)]]
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| ==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}} |
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| ==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 |