DSE Bargain CRO

[Jadzax]

"Keith" <[email protected]>

** Nowhere man ......

" Living in a nowhere land. "


Hardly possible to describe a pathological, autistic **** like "Keith"
more precisely than Lennon and McCartney did back in 1965.




........ Phil

Time for you to make the sacrifice philly , go on you know you want to .
( top your self)

 

[Keith]

Hardly possible to describe a pathological, autistic **** like "Keith"
more precisely than Lennon and McCartney did back in 1965.

People who use the word **** as a derogatory term obviously aren't getting
any sex at all. That probably explains your sour demeanour, go and take
your frustrations out elsewhere boy.

 

[Keith]

"Keith" <[email protected]>

** Nowhere man ......

" Living in a nowhere land. "


Hardly possible to describe a pathological, autistic **** like "Keith"
more precisely than Lennon and McCartney did back in 1965.

"isn't he a bit like you and me?"

so are you a pathological, autistic **** then?

Same shit same day, there obviously ain't much going on in that little head
of yours boy, no wonder you can't handle anything more complex than a DSE
scope or outlook express.

 

[quietguy]

** Two questions:

1. Is there an external means of rotating the trace - ie make it horizontal
in spite of the earths mag field.

Yes, mechanical adj on the rear of the case - a no sweat adj.

2. Is there any spec for the maximum *safe* ( ie non damaging) input
voltage on the vertical amp?

400Vp according to a label on the CRO itself

David

 

[Phil Allison]

"quietguy"

Yes, mechanical adj on the rear of the case - a no sweat adj.


400Vp according to a label on the CRO itself

** Thanks very much for that David.

Looks like the DSE , 10MHz CRO can be safely recommended to most hobbyists
and techs with not too demanding requirements.

If I did not have 4 perfectly functioning CROs ( inc a valve one I built
in 1970) already I might get one myself !!



......... Phil

 

[quietguy]

Was that the EA 3inch CRO? I built one of those - but some bastard broke into
my workshop and stole it

David

 

[Phil Allison]

"quietguy"

Was that the EA 3inch CRO?

** The mag was still called Radio TV and Hobbies (RTV&H) in May 1966 when
the CRO design I built was published.

It used the Philips DG7-32 3 inch CRT, 2 x 6GH8s for vertical, 2 x 6BL8s
for horizontal and a 12AT7 for the synch. The PSU used EM408 silicon diodes
and the tube had a full Mu-metal shield - an essential item missing from
most budget CROs. Vertical bandwidth was 2 MHz and all ranges were
calibrated in 1-2-5 steps.

I built one of those - but some bastard broke into
my workshop and stole it

** Probably thought it was a mini TV set.



........... Phil

 

[Mr.T]

and the tube had a full Mu-metal shield - an essential item missing from
most budget CROs.

If it's "essential", why then are you recommending the DSE CRO. Does it
really have a Mu metal shield?

MrT.

 

[Phil Allison]

"Mr.T"
"Phil Allison"

** The mag was still called Radio TV and Hobbies (RTV&H) in May 1966 when
the CRO design I built was published.

It used the Philips DG7-32 3 inch CRT, 2 x 6GH8s for vertical, 2 x 6BL8s
for horizontal and a 12AT7 for the synch. The PSU used EM408 silicon diodes
and the tube had a full Mu-metal shield - an essential item missing from
most budget CROs. Vertical bandwidth was 2 MHz and all ranges were
calibrated in 1-2-5 steps.

If it's "essential", why then are you recommending the DSE CRO. Does it
really have a Mu metal shield?

** A mu-metal shield is not essential for a CRT CRO to function - but it
an "essential item" for any respectable lab or workshop instrument.
Practically all older CROs ( pre 1980) and those priced over the $ 1500
level have one.

So far, I have not "recommended" the DSE budget CRO to anyone, but I
really doubt there is any new, CRT CRO at near the price that has mu-metal
CRT shield.

BTW

For those who don't know, lack of a magnetic CRT shielding means the trace
is vulnerable to 50 /60 Hz displacement (seen as annoying shimmer or wobble)
by radiated fields from any AC supply transformer placed near the
instrument. These fields are hardy attenuated by the steel casing of the
CRO and can affect the trace at up to 1 metre away.

This is not such a big problem with small, lightweight CROs ( like the DSE
one) that can simply be moved from the source of AC hum field as need be.


......... Phil

 

[Mr.T]

"Mr.T"


** A mu-metal shield is not essential for a CRT CRO to function - but it
an "essential item" for any respectable lab or workshop instrument.
Practically all older CROs ( pre 1980) and those priced over the $ 1500
level have one.

So far, I have not "recommended" the DSE budget CRO to anyone, but I
really doubt there is any new, CRT CRO at near the price that has mu-metal
CRT shield.

BTW

For those who don't know, lack of a magnetic CRT shielding means the trace
is vulnerable to 50 /60 Hz displacement (seen as annoying shimmer or wobble)
by radiated fields from any AC supply transformer placed near the
instrument. These fields are hardy attenuated by the steel casing of the
CRO and can affect the trace at up to 1 metre away.

This is not such a big problem with small, lightweight CROs ( like the DSE
one) that can simply be moved from the source of AC hum field as need be.

Good reply Phil, and I certainly agree that the DSE CRO looks like being the
answer to many poor hobbyists prayers. It used to cost that much for a cheap
3 1/2 digit DMM.

MrT.

 

[Phil Allison]

"Phil Allison"

Good reply Phil, and I certainly agree that the DSE CRO looks like being
the
answer to many poor hobbyists prayers. It used to cost that much for a
cheap
3 1/2 digit DMM.

** My first DMM was a "Kaise " 6200, bought from Radio Despatch service in
about 1981 - price inc sales tax was $87.00 equal to about a $220 in
today's value.

The DSE bargain CRO is cheaper than a Fluke 70 series meter now.



........... Phil