Products > Test Equipment
Hantek HDG2002B AWG: 5Mhz or 100MHz? Let's see!
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leppie:

--- Quote from: idpromnut on September 23, 2014, 01:07:06 pm ---Hmm, I don't know about a new bench supply, but I know you definitely have a Repair Project on your hands! ;)

--- End quote ---

I will wait for the new scope, so I can get some screen caps. Taking photo's on the TDS360 is troublesome at best :)
marabut:

--- Quote ---Tinhead suggests, as per the 1st post, that U25 is an LMX5080 or a MB510 [...]
--- End quote ---
Is it possible they're using obsolete parts in quite contemporary design?
I've searched (not thoroughly) NS(now TI) website but I couldn't find any pin-to-pin replacement part being in production now. MB510 is easier to find, there is a few offers on eBay now.
According to datasheets, it seems that with pins 3, 6, 7 tied to Vcc both parts should have 1/128 divide ratio (however for MB510 pin 7 is described as NC and should be left unconnected). LMX is more sensitive though (-15dB vs. -10dB) and can work with 2.7V Vcc (MB510 - 5V only).

Maybe somebody (who has unit with working HF counter) can check U25 marking and post the info here? 
idpromnut:

--- Quote from: marabut on September 23, 2014, 08:22:13 pm ---
--- Quote ---Tinhead suggests, as per the 1st post, that U25 is an LMX5080 or a MB510 [...]
--- End quote ---
Is it possible they're using obsolete parts in quite contemporary design?
I've searched (not thoroughly) NS(now TI) website but I couldn't find any pin-to-pin replacement part being in production now. MB510 is easier to find, there is a few offers on eBay now.
According to datasheets, it seems that with pins 3, 6, 7 tied to Vcc both parts should have 1/128 divide ratio (however for MB510 pin 7 is described as NC and should be left unconnected). LMX is more sensitive though (-15dB vs. -10dB) and can work with 2.7V Vcc (MB510 - 5V only).

Maybe somebody (who has unit with working HF counter) can check U25 marking and post the info here?

--- End quote ---

What makes you think you do not have a working HF counter?
Cyber7:

--- Quote ---Is it possible they're using obsolete parts in quite contemporary design?
--- End quote ---

Possibly, considering that they have nixed the feature. You can still find stock of the 5080, but only in lot qty from overstock/grey suppliers. HT probably had spare stock left over from the DDS3005 (2.7GHz Frequency Counter, PC USB Function/Arbitrary Waveform Generator). Looks like the same LF: DC to 25Mhz / HF: 25Mhz to 2.7Ghz design params.
Cyber7:
idpromnut:
--- Quote ---What makes you think you do not have a working HF counter?
--- End quote ---

In Reply #237, you posted pix of your HF counter mod, including a populated U25 adjacent to the jack you replaced.
marabut's unit is not populated for U25 as per his pix. Looks like fremen67 had the same issue based on his initial postings, and tinhead's reply: "the Frequency Counter, you right, that will be something like LMX5080 or MB510". If U25 is the HF prescaler, then attaching a lead to the PCB directly with a test osc should fail to register anything on a 'upgraded' unit, right?

Do you have a better pic of the U25 area, or happen to make note of the part #?

I won't have my unit delivered for another 2 weeks....so I'm just fishing based on the pix and posts. Also trying to get a leg up, in case I need to populate the part too.
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