开云体育

I still have a 556 which I built my own cart for. I have it next to my test bench and use it often. I bought it with the manual for $25 at a HAM fest about 15 years ago. Other than needing a vertical

Many thanks Roger. At R1423, I find +141.7. Now, my issue is something dragging down the +110. It's currently sitting at 87.3. If I leave the unit on, it will slowly drop even more. Glen

OK, I understand the +105/+160V measurement problem! There is some screen printing on the 475 PCB near Q1490 that says '+105/160V' and it is printed on one of the PCB traces but that trace does NOT

I'm trying to measure the +105/160 from the labeled trace. This trace with +105/160 printed on it ends on the + of C1452. So, basically, I was trying to find +105/160 on C1452. Maybe I'm trying

I have a 549 with Type Z, 1A2 and 1A4 plugins. I love it and it just works, though I need to do some mechanical restoration work on one of the 1A4 channels. I also have a 564 which produces a trace

There's still an interest!? ? I have a 575 (used irregularly) and a 545 (used OFTEN).? ?but it just works every time I turn it on.? ?I haven't needed to fix it in a few years.? ? I completely

David DiGiacomo wrote: .... Ok, when I read the above line, I immediately snorted! Then I realized he was talking about the cooling fan, and not scope aficionados. -Chuck Harris

That is not what the OP is talking about! The 2465 family has a variable frequency calibrator, which always shows a couple cycles of the calibrator signal, regardless of the sweep speed. The purpose

Hi, I am struggling to understand your measurements. The +105/160 is the unregulated supply to Q1496 which regulates the +110V line, so it is hard to understand why the output voltage from the

Hi everyone , I also have 500 series scopes , 547 , 2 x 549 and a 564 . I even have a 661 that still works . I like all these scopes and will hang on to them as long as I have the space as they are

Hi, 7104 is a very special instrument with a MCP CRT, which is very susceptible to damage from excessive brightness and static images. You can easily destroy it if careless, or if the instrument is

I still use a 547 as my main bench scope and a 575 to test semiconductors. Fortunately I have the skills to maintain them. I have several 7000 series and a DSO but don't need their facilities very

I'm unconvinced it could check the measurement accuracy in one sense, since I assume the cursors and calibration signal are derived from the same source. It could be used to check the X linearity and

Hi Marcial, Have a look at W2AEW's YouTube channel here: https://www.youtube.com/channel/UCiqd3GLTluk2s_IBt7p_LjA search there for 'compensation' and watch the probe compensation videos. This

Sorry, there was a resistor with 104V on it and this resistor was touching the groundplane of the PCB. [email protected]> wrote:

On mine, I had a fault where the 104 was dragging down the 110v The 104v was shorting/arcing to the ground plane of the pcb as it was touching and over the years the paint on the R wore off?. I

I have a bunch of 500 series working scopes. Real room heaters. Keith Wayzata, mn.

The 7934 is somewhat rare (much rarer than the 7834), and is a fine storage scope. Like all Tek's "multimode" storage scopes, bistable is useless (ridiculously low contrast), but in variable

I have found that moving the horizontal volts division selector around significantly affects the trace artifact with the step generator on. Some horizontal volts / division causes a aggravated trace

The 7934 is the best Tek storage mainframe. It's quite usable as a general purpose scope in non-storage mode, but obviously it is not as bright as a 7904 or 7904A. Both the 7934 and 7904A have fans