Temperature probe for Tek 7D13?

R

Robert Baer

Guest
Does anyone know the designation/PN for the Tektronix 7D13 Digital
Multimeter plugin?
Also, the schematic and/or how to make working equivalent?
 
Robert Baer wrote:
Does anyone know the designation/PN for the Tektronix 7D13 Digital
Multimeter plugin?
Also, the schematic and/or how to make working equivalent?
Click to expand...
Most of the temp probes of that vintage were merely a transistor
at the end of a wire. Tiny ceramic Pill packages stuck on the end of a
stick.
If the 7D13 uses the difference voltage at two current levels, most
any transistor will work.
mike

--
Return address is VALID.
Wanted, 12.1" LCD for Gateway Solo 5300. Samsung LT121SU-121
Bunch of stuff For Sale and Wanted at the link below.
Compaq Aero floppy,ram,battery.
MINT HP-41CV, 2-METER AMPS, 200CH SCANNER
http://www.geocities.com/SiliconValley/Monitor/4710/
 
mike wrote:
Robert Baer wrote:
Does anyone know the designation/PN for the Tektronix 7D13 Digital
Multimeter plugin?
Also, the schematic and/or how to make working equivalent?

Most of the temp probes of that vintage were merely a transistor
at the end of a wire. Tiny ceramic Pill packages stuck on the end of a
stick.
If the 7D13 uses the difference voltage at two current levels, most
any transistor will work.
mike

--
Return address is VALID.
Wanted, 12.1" LCD for Gateway Solo 5300. Samsung LT121SU-121
Bunch of stuff For Sale and Wanted at the link below.
Compaq Aero floppy,ram,battery.
MINT HP-41CV, 2-METER AMPS, 200CH SCANNER
http://www.geocities.com/SiliconValley/Monitor/4710/
Click to expand...
Thanks for the info; i really appreciate it.
The Tek 7D13 uses a special 4-pin connector; two are closer to the
entry than the other two, insulation making a "D" shape.
It would be hell to find a matching connector.
Then there is the case of what the "extra" two are for...
....and how wired.
 
Robert Baer <robertbaer@earthlink.net> wrote in
news:412EF7E8.E2AEBAF9@earthlink.net:

mike wrote:

Robert Baer wrote:
Does anyone know the designation/PN for the Tektronix 7D13 Digital
Multimeter plugin?
Also, the schematic and/or how to make working equivalent?

Most of the temp probes of that vintage were merely a transistor
at the end of a wire. Tiny ceramic Pill packages stuck on the end of a
stick.
If the 7D13 uses the difference voltage at two current levels, most
any transistor will work.
mike

--
Return address is VALID.
Wanted, 12.1" LCD for Gateway Solo 5300. Samsung LT121SU-121
Bunch of stuff For Sale and Wanted at the link below.
Compaq Aero floppy,ram,battery.
MINT HP-41CV, 2-METER AMPS, 200CH SCANNER
http://www.geocities.com/SiliconValley/Monitor/4710/

Thanks for the info; i really appreciate it.
The Tek 7D13 uses a special 4-pin connector; two are closer to the
entry than the other two, insulation making a "D" shape.
It would be hell to find a matching connector.
Click to expand...
A "Lemo" connector. Digi-Key sells them,IIRC.

Then there is the case of what the "extra" two are for...
...and how wired.
Click to expand...
One's used as a shield connection,IIRC.
IIRC,the same temp probe was used for the DM501(non-A).

--
Jim Yanik
jyanik-at-kua.net
 
Jim Yanik wrote:
Robert Baer <robertbaer@earthlink.net> wrote in
news:412EF7E8.E2AEBAF9@earthlink.net:

mike wrote:

Robert Baer wrote:
Does anyone know the designation/PN for the Tektronix 7D13 Digital
Multimeter plugin?
Also, the schematic and/or how to make working equivalent?

Most of the temp probes of that vintage were merely a transistor
at the end of a wire. Tiny ceramic Pill packages stuck on the end of a
stick.
If the 7D13 uses the difference voltage at two current levels, most
any transistor will work.
mike

--
Return address is VALID.
Wanted, 12.1" LCD for Gateway Solo 5300. Samsung LT121SU-121
Bunch of stuff For Sale and Wanted at the link below.
Compaq Aero floppy,ram,battery.
MINT HP-41CV, 2-METER AMPS, 200CH SCANNER
http://www.geocities.com/SiliconValley/Monitor/4710/

Thanks for the info; i really appreciate it.
The Tek 7D13 uses a special 4-pin connector; two are closer to the
entry than the other two, insulation making a "D" shape.
It would be hell to find a matching connector.

A "Lemo" connector. Digi-Key sells them,IIRC.

Then there is the case of what the "extra" two are for...
...and how wired.


One's used as a shield connection,IIRC.
IIRC,the same temp probe was used for the DM501(non-A).

--
Jim Yanik
jyanik-at-kua.net
Click to expand...
Someone was kind enough to e-mail me a link to a DM501 schematic.
With that, i found two corroded tantalums (corroded weld at case on
negative lead); replaced them with aluminum electrolytics, and it works
fine.
2 wires are for emitter and collector; shield (ground) is the base of
the NPN.
The other 2 in this case are for measuring voltage.

I appreciate the help from everyone.
Thanks!!
 
Robert Baer wrote:
mike wrote:

Robert Baer wrote:

Does anyone know the designation/PN for the Tektronix 7D13 Digital
Multimeter plugin?
Also, the schematic and/or how to make working equivalent?

Most of the temp probes of that vintage were merely a transistor
at the end of a wire. Tiny ceramic Pill packages stuck on the end of a
stick.
If the 7D13 uses the difference voltage at two current levels, most
any transistor will work.
mike

--
Return address is VALID.
Wanted, 12.1" LCD for Gateway Solo 5300. Samsung LT121SU-121
Bunch of stuff For Sale and Wanted at the link below.
Compaq Aero floppy,ram,battery.
MINT HP-41CV, 2-METER AMPS, 200CH SCANNER
http://www.geocities.com/SiliconValley/Monitor/4710/


Thanks for the info; i really appreciate it.
The Tek 7D13 uses a special 4-pin connector; two are closer to the
entry than the other two, insulation making a "D" shape.
It would be hell to find a matching connector.
Then there is the case of what the "extra" two are for...
....and how wired.
Click to expand...
The connector is called a LIMO connector. Not sure whether that's the
name of the manufacturer or what.

You really should get the correct info for the 7D15. TEK used two
methods. One just based the reading on the voltage of the remote
junction. A more accurate method measures the voltage at two different
currents and does some math to get the temperature. I think it matters
how the transistor is wired...but maybe not. I think the transistor is
much more critical for the one-current method. If it's got a junction,
the two-current method will work.
Can't hurt to try it.
mike

--
Return address is VALID.
Wanted, 12.1" LCD for Gateway Solo 5300. Samsung LT121SU-121
Bunch of stuff For Sale and Wanted at the link below.
Compaq Aero floppy,ram,battery.
MINT HP-41CV, 2-METER AMPS, 200CH SCANNER
http://www.geocities.com/SiliconValley/Monitor/4710/
 
mike wrote:
Robert Baer wrote:
mike wrote:

Robert Baer wrote:

Does anyone know the designation/PN for the Tektronix 7D13 Digital
Multimeter plugin?
Also, the schematic and/or how to make working equivalent?

Most of the temp probes of that vintage were merely a transistor
at the end of a wire. Tiny ceramic Pill packages stuck on the end of a
stick.
If the 7D13 uses the difference voltage at two current levels, most
any transistor will work.
mike

--
Return address is VALID.
Wanted, 12.1" LCD for Gateway Solo 5300. Samsung LT121SU-121
Bunch of stuff For Sale and Wanted at the link below.
Compaq Aero floppy,ram,battery.
MINT HP-41CV, 2-METER AMPS, 200CH SCANNER
http://www.geocities.com/SiliconValley/Monitor/4710/


Thanks for the info; i really appreciate it.
The Tek 7D13 uses a special 4-pin connector; two are closer to the
entry than the other two, insulation making a "D" shape.
It would be hell to find a matching connector.
Then there is the case of what the "extra" two are for...
....and how wired.

The connector is called a LIMO connector. Not sure whether that's the
name of the manufacturer or what.

You really should get the correct info for the 7D15. TEK used two
methods. One just based the reading on the voltage of the remote
junction. A more accurate method measures the voltage at two different
currents and does some math to get the temperature. I think it matters
how the transistor is wired...but maybe not. I think the transistor is
much more critical for the one-current method. If it's got a junction,
the two-current method will work.
Can't hurt to try it.
mike

Thanks; Limo is the name of the manufacturer of many spiffy and
Click to expand...
compact connectors that make the old MIL styles look like elephants by
comparison.
Got on their website and found the mating connector.
I was not aware that Tektronics used two methods - had the impression
they used the two current method, as that needs almost zero calibration
and allows probe interchangeability.
The "math" is in the form of simple differences, and ordinary op amps,
resistors, etc are used.
The schematic of the DM501 was very useful, and (except for part
numbering like Q123) essentially identical to the 7D13.
I found the other pair of wires is for remote voltage measurements.
 
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