Products > Test Equipment

Teardown - Hitachi V1065

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ulyanoff:
Hello guys, does anyone have a broken oscilloscope from the V660, V665, V695, V1065 series, or maybe you know where you can buy the front frame and filter of the oscilloscope? Thanks

wn1fju:
Old post, but I just recently came across it.  I can confirm that the hack mentioned earlier to enable the frequency counter also works on the 60 MHz Hitachi V-665 oscilloscope. 

It was fairly easy to do without first swinging the power supply out of the way.  I merely reached in there on an angle, cracked off the existing zero ohm resistor and soldered a jumper wire across the adjacent pair of pads.

As also mentioned before, there is an inaccuracy with this enabled option.  Mine reads consistently 0.55% low.  That is, a 1000 Hz waveform reads 994.5 Hz, a 10 kHz waveform reads 9.945 kHz, ...., a 10 MHz waveform reads 9.945 MHz.  When making measurements using the cursors (1/T), I do get the correct numbers, however.  The frequency measurement option appears only to go down to a lower limit of 50 Hz.

pbs74:
Since this thread got resurrected anyway, it seems to be the only one for this model on this great forum, and I happen to own the basically similar v1565 model that is shown in this new video that forum user oz2cpu added to his YouTube channel today, I am going to add a link to it here as reference for any future readers. The video covers most of the functionality, along with high level tear down:
 

wn1fju:
pbs74:  Very nice video, thanks.

Yes, I did have to consult the manual on the somewhat puzzling way of using the toggle switch and the adjacent knob.

I have resurrected a few Asian-produced analog scopes (BK Precision, EZ, Iwatsu, Leader, Phillips, Tenma), as well as the usual USA Tektronix and HP units.  I find the HItachi scope among the best.  Fortunately, my V-665 mostly worked when I got it (needed some cleaner sprayed in the pots/switches).  It looks a little challenging to rip it all apart for servicing.

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