Take a silicon diode or a shottkey diode.? Put a current meter in series with it and measure the resistance.? Now you know how much (at a minimum) your meter will dump into the diode.
Try the same with a cheap digital meter.
Harvey
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On 9/21/2024 11:37 AM, Bill Berzinskas wrote:
Its a simpson 260, open to hearing any tips before i go in!
On Sat, Sep 21, 2024 at 10:57?AM Dave Wise via groups.io <> <d44617665@...> wrote:
Some analog VOMs put out enough current to fry a mixer diode.
------------------------------------------------------------------------
*From:* [email protected]
<[email protected]> on behalf of Bill
Berzinskas <bberzinskas@...>
*Sent:* Saturday, September 21, 2024 7:48 AM
*To:* [email protected]
<[email protected]>
*Subject:* Re: [HP-Agilent-Keysight-equipment] HP 8554B, no RF
after first successful run...
I did re-check, and I've since gotten more?problems
in?this?area...? ? ? :-D? -10v supply is no longer happy..
Lot of people saying it might be the mixer diodes, so I may check
those w/ my old analog meter today after I look
over MORE POWER SUPPLIES....
On Sat, Sep 21, 2024 at 5:27?AM Martin via groups.io
<> <musaeum@...> wrote:
Hi Bill,
When I first read your post I thought you did some very low
frequency stuff.
Actually you're referring to MHz (Megahertz), not mHz
(Millihertz).
Since you left the unit running for a while until the fault
condition appeared: did you re-check once it was cold again?
Like after 24 hours?
cheers
Martin
