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Going by the schematic, the display digits are multiplexed which is the common configuration so if the middle horizontal segment is working on at least some digits, then the 7 segment display driver

Yeah. It doesn't have any markings on it other than the name "Fairchild" on the cable, and I am glad I checked it before I actually tried to test it. In looking at an old but classic oscilloscope book

More than likely the LED read outs. Chris VK4CVL

Anyone familiar with the TM500 counter, model DC504 ? I just picked one up & I noticed a couple of the digits are missing the middle horizontal segment. So, it displays an "8" as a "0", or a "0" as a

I think you are measuring the inner conductor resistance. This is made of resistance wire (often wound in a spiral) to damp reflections back the cable. The cable isn't terminated (the input impedance

John, A HUGE thank you on checking that and giving me your value! I was hoping the short wasn't in the main board somewhere as that doesn't look like fun to pull in the least. I just checked the

I'm wondering if it could be an RF probe.? http://n5ese.com/rfprobe1.htm <snip>

Priya, You could probably use ch3 to probe for the comparisons as a last resort on the following. I would set up identical conditions on both ch2 and ch1. then on ch 2 compare signal traces starting

You are right. It is necessary to get the lube to the shaft of the control. If that is internal to the scope, you will need to open the scope up to where you can get to the control. I have found that

I have a T912 which had tight controls on the brightness and something else (focus?). I managed to free them up a bit but they need more TLC. These pots are located back inside the scope with plastic

I assume you mean a 2445A/65A/67 and 2445B/65B/67B. I know the 24xx Digital Scopes have no such limit. I just tried using a 1.2V sine wave and was able to measure pk-pk accurately to over 200MHz.

Be careful with that! Danger, 640 Ohms!

I do not know if it applies to this type of scope. However, I have had knobs appear to be seized when in truth the knob has slid down the shaft and is binding on the back of the knob to the chassis.

4 NiCd = 5 volts. No, this is just a outside fast signal source to test the triggering ability. I test the TDs in a curve tracer ( carefully !!! ). Then follow up using a tunnel dipper. Tunnel diodes

I have been using my 454A for 40 years and never had any problems. I love it! They are one of the most reliable scopes Tek has built. Nick

That is a good question. The similar 100 MHz 2247A specifications divide the total bandwidth into two frequency ranges at 25 MHz and say that peak voltage measurements above 25 MHz follow the trigger

<john@...> wrote: So far the best oil I have found for small fan bushings and bearings is heavy gear oil like you would use in a transmission or differential. I poured some into a needle

So posting is all correct except for a calling it a current probe. Thank you for the leg work. I should likely have noticed the part number with less than 'normal' digits.. and guessed it a prior

Looking for confirmation of my understanding of the Tek specs for automatic voltage measurement in the 2400 series scopes. Am I right in understanding that automatic voltage measurement is spec'ed to

It's not too hard. Just a disassemble, clean and grease if not gone too far.