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Search found 36 matches

by steve_tech
September 24th, 2015, 10:20 am
Forum: Other or Discontinued Oscilloscopes
Topic: CRT upgrade for a 7904?
Replies: 1
Views: 10875

Re: CRT upgrade for a 7904?

I highly doubt it. 7104 is a micro channel plate image intensifier. The tube is one of kind.
by steve_tech
September 24th, 2015, 10:15 am
Forum: Current
Topic: What is output of AC/DC Current Probe?
Replies: 1
Views: 11784

Re: What is output of AC/DC Current Probe?

Normally, Zero current equals zero voltage out. IMHO you might be better off getting a used probe if budget is constrained. Tektronix current probes have evolved over years and the nuances are significant.
by steve_tech
March 24th, 2015, 2:15 pm
Forum: Other or Discontinued Probes
Topic: new to oscilloscope - probe questions
Replies: 2
Views: 14740

Re: new to oscilloscope - probe questions

As you have found, there is a lot more to good scope probe design than is readily apparent. I suggest you see our ABC's of Probes for the background. The 2445 has 15 pf of input capacitance which happens to be the lower limit for the probes you have. Make sure you are using them in 10X mode. Your ri...
by steve_tech
January 7th, 2015, 4:48 pm
Forum: Current
Topic: Calibration problem on TCP312
Replies: 1
Views: 11609

Re: Calibration problem on TCP312

Here is some info from our current probes expert: I assume that the customer is having an issue with the DC gain being too low. This is by far the more likely situation. One known wear mechanism for these current probes is that the effective air gap increases over time. The first thing I would recom...
by steve_tech
November 20th, 2014, 12:11 pm
Forum: Current
Topic: A6304XL takes too long to degauss
Replies: 2
Views: 14844

Re: A6304XL takes too long to degauss

The A6304Xl transformer is probably defective and you should see if you can adjust the offset with the manual. Also open and close probe while it is hung up to see if it complete the degauss…. Might be helpful to know. That was a while ago… If the Hall device drift/noise is higher than expected the ...
by steve_tech
September 29th, 2014, 9:55 am
Forum: High Voltage
Topic: Probe Tektronix P5122
Replies: 4
Views: 24473

Re: Probe Tektronix P5122

You could use a good DMM to measure the 100M ohm input R and an LCR meter for input C. Right at the probe tip.

Steve
by steve_tech
July 8th, 2014, 1:02 pm
Forum: Other or Discontinued Oscilloscopes
Topic: TEK 475A
Replies: 4
Views: 19109

Re: TEK 475A

I used a 6 1/2 digit ohm meter with home brew 4 wire probes to find a shorted tantalum cap in mine. You can also force a small current and look for smallest voltage. The 475 has a graceful shutdown circuit where all supplies are resistively summed and if the nets voltage isn't right, the power suppl...
by steve_tech
June 10th, 2014, 3:37 pm
Forum: Other or Discontinued Probes
Topic: Difficult Probe Connections
Replies: 0
Views: 9059

Difficult Probe Connections

As dimensions shrink, probing devices has become more challenging. Tell us about any challenges you've had. Also, if you have any techniques that have been successful, please let us know.
by steve_tech
June 9th, 2014, 3:32 pm
Forum: Other or Discontinued Oscilloscopes
Topic: When did the analog out rear bnc disappear?
Replies: 9
Views: 34739

Re: When did the analog out rear bnc disappear?

I miss the analog out as well. For measuring frequencies, nothing beats using a good FET probe on a scope and sending the buffered and scaled output to your frequency counter. Much greater sensitivity and much less loading.
by steve_tech
June 9th, 2014, 2:49 pm
Forum: Other or Discontinued Probes
Topic: Find a Probe for your scope
Replies: 0
Views: 8848

Find a Probe for your scope

This pages gives information on probe compatibility.

http://www.tek.com/probes

Steve_tech
by steve_tech
June 9th, 2014, 2:36 pm
Forum: Other or Discontinued Probes
Topic: ABC's of Probes
Replies: 0
Views: 8908

ABC's of Probes

For general probe theory and lots of useful information:

http://www.tek.com/learning/probes-tutorial

Steve_tech
by steve_tech
June 6th, 2014, 9:28 am
Forum: Other or Discontinued Oscilloscopes
Topic: CSA803 (real) service manual
Replies: 2
Views: 13266

Re: CSA803 (real) service manual

The CSA803 is a very cool scope. I have 2. There are a couple of issues. One , the complexity of the hardware means even the team who designed the circuits would have a difficult time troubleshooting to the component level. As a one time top of the line scope, some of the technology involved trade s...
by steve_tech
April 14th, 2011, 9:09 am
Forum: Other or Discontinued Oscilloscopes
Topic: 7854, 7L12, FG 504, 7D01 questions
Replies: 5
Views: 24507

Re: 7854, 7L12, FG 504, 7D01 questions

7L12 has no audio demodulate at center frequency. Some newer SA do but a service monitor is best for that kind of stuff.
by steve_tech
January 31st, 2011, 4:05 pm
Forum: Other or Discontinued Oscilloscopes
Topic: Model 468
Replies: 2
Views: 15746

Re: Model 468

I also have a 468. 100MHz analog storage if I remember right. Try edebris.com for a manual. They are free and have a lot of old Tek and HP manuals.

[email protected]
by steve_tech
January 19th, 2011, 12:49 pm
Forum: Programming Support
Topic: DMM4050 capacitance test frequency?
Replies: 1
Views: 13576

Re: DMM4050 capacitance test frequency?

You might be able to connect the leads to a scope input and see the stimulus waveform.
by steve_tech
January 19th, 2011, 12:45 pm
Forum: Programming Support
Topic: Adding a GPS receiver to your counters
Replies: 10
Views: 44585

Re: Adding a GPS receiver to your counters

It of course is nice to have an accurate timebase for a frequency counter. However, I think it makes more sense to have an stand alone 10 MHz reference oscillator. In my home lab of 350 instruments, I have two dozen counters, RF gens, synthesizers, etc with external ref inputs. I have a rubidium osc...
by steve_tech
January 19th, 2011, 12:38 pm
Forum: Programming Support
Topic: Programmable & Non-Programmable Power Supply
Replies: 1
Views: 12256

Re: Programmable & Non-Programmable Power Supply

Programmable supplies have a capability to be controlled by a computer through GPIB or USB or other comm standard. This capability makes them useful in automated tests. Lets say you want to look at a circuits distortion when power supply is from 10V to 18V. You could manually adjust the power supply...
by steve_tech
January 13th, 2011, 9:52 am
Forum: Other or Discontinued Oscilloscopes
Topic: Type 531 scope, vertical sweep not working
Replies: 1
Views: 13175

Re: Type 531 scope, vertical sweep not working

Make sure the wires going to vertical deflection plates in CRT are connected. My first scope, a 547, had same problem. Also, find booklet on web: Troubleshooting Your Oscilloscope: Getting down to Basics. This is an oldy but goody. Lots of tips for fixing scopes. Also Stan Griffiths wrote a book cal...
by steve_tech
January 13th, 2011, 9:45 am
Forum: Other or Discontinued Oscilloscopes
Topic: 7704A Compression at top of display
Replies: 3
Views: 19568

Re: 7704A Compression at top of display

Check power supplies. Sounds like an amp is running out of gas.

Use another scope to trace signal path.

Tek made chips can be obtained from Sphere Corp in Canada.
by steve_tech
January 13th, 2011, 9:40 am
Forum: Other or Discontinued Oscilloscopes
Topic: Tek 2245A
Replies: 3
Views: 21084

Re: Tek 2245A

The 2245A was my first solid state scope. I now have about 30 different ones. The only failure I've ever had on the 2245A was a shorted LED used as the AC indicator on front panel. This disabled the controls, but I found if I set the sweep speed in between detents I could get a trace. I then layed t...

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