Scope power...

[Tom Del Rosso]

Why is it still necessary to worry about probing a floating ground?

Most digital scopes have power requirements like high-end laptops, so
why can\'t they have a battery option?

They all have plastic cases, so why can\'t they have isolated supplies
and no earth connection?


--
Defund the Thought Police

 

[Tom Del Rosso]

Phil Allison wrote:

** BNC plugs are metal and so are accessory connectors on the front
and back.

I get the point. Maybe not a problem with a single channel battery
scope.

 

[Tom Del Rosso]

jurb...@gmail.com wrote:

Enough for now. just find transformers at least six amps with
secondaries adding up to the line voltage. Cheapest and easiest way.

Interesting...thanks.


--
Defund the Thought Police

 

[Phil Allison]

Tom Del Rosso wrote:

==================

** BNC plugs are metal and so are accessory connectors on the front
and back.

I get the point. Maybe not a problem with a single channel battery
scope.

** Like multimeter style scopes?

Hate them.


...... Phil

 

[Cydrome Leader]

Phil Allison <pallison49@gmail.com> wrote:

Phil Allison wrote:
================

My 1987 analogue scope ( 10x8 cm, 50MHz, dual trace) draws the same power as my 1052E

** Just rechecked, the Rigol uses 18W and the trusty BWD 825 only 15.


** Bugger - its a BWD 821

http://bee.mif.pg.gda.pl/ciasteczkowypotwor/B.W.D/bwd_821_001.pdf

In 34 years of daily use, I have replaced 1 open 22kohm resistor and 1 pull switch mini pot.


..... Phil

but, but but, it\'s not capable of 3Ghz and sampling. It must be a useless
instrument.

 

[Phil Allison]

Cydrome Leader wrote:

===================

** Bugger - its a BWD 821

http://bee.mif.pg.gda.pl/ciasteczkowypotwor/B.W.D/bwd_821_001.pdf

In 34 years of daily use, I have replaced 1 open 22kohm resistor and 1 pull switch mini pot.

but, but but, it\'s not capable of 3Ghz and sampling. It must be a useless
instrument.

** Very true.....

But I needed a scope for knock down, drag out service work on all kinds of items from
tube amps to 2kW SMPSs to 1kW linear mosfet power amplifiers.
Plus all the small stuff like condensor mics.
Plus I needed to be able to service it myself with readily available spares.
Plus it must have a mu-metal shield on the tube.

I was able to buy a spare, internal graticule, PDA CRT for it for under $200 - beautiful thing.
Eats the Rigol for breakfast for what I do.


....... Phil

 

[Cydrome Leader]

Phil Allison <pallison49@gmail.com> wrote:

Cydrome Leader wrote:

===================

** Bugger - its a BWD 821

http://bee.mif.pg.gda.pl/ciasteczkowypotwor/B.W.D/bwd_821_001.pdf

In 34 years of daily use, I have replaced 1 open 22kohm resistor and 1 pull switch mini pot.

but, but but, it\'s not capable of 3Ghz and sampling. It must be a useless
instrument.

** Very true.....

But I needed a scope for knock down, drag out service work on all kinds of items from
tube amps to 2kW SMPSs to 1kW linear mosfet power amplifiers.
Plus all the small stuff like condensor mics.
Plus I needed to be able to service it myself with readily available spares.
Plus it must have a mu-metal shield on the tube.

I was able to buy a spare, internal graticule, PDA CRT for it for under $200 - beautiful thing.
Eats the Rigol for breakfast for what I do.

nice. How rare/common is the fancy shielding on a scope? I don\'t travel
with a scope so it\'s never been an issue for me.

A friend just got his first scope, some sort of mid 1980s Kenwood. He
emailed kenwood in japan and they send a scan of the manual. Sort of
jealous of it in fact.

 

[Phil Allison]

Cydrome Leader wrote:
====================

** Bugger - its a BWD 821

http://bee.mif.pg.gda.pl/ciasteczkowypotwor/B.W.D/bwd_821_001.pdf

In 34 years of daily use, I have replaced 1 open 22kohm resistor and 1 pull switch mini pot.

but, but but, it\'s not capable of 3Ghz and sampling. It must be a useless
instrument.

** Very true.....

But I needed a scope for knock down, drag out service work on all kinds of items from
tube amps to 2kW SMPSs to 1kW linear mosfet power amplifiers.
Plus all the small stuff like condensor mics.
Plus I needed to be able to service it myself with readily available spares.
Plus it must have a mu-metal shield on the tube.

I was able to buy a spare, internal graticule, PDA CRT for it for under $200 - beautiful thing.
Eats the Rigol for breakfast for what I do.

nice. How rare/common is the fancy shielding on a scope?

** Low cost, Asian CRT scopes are unshielded.
Everything else pretty much is.

I don\'t travel with a scope so it\'s never been an issue for me.

** Got nothing to do with travelling.

A friend just got his first scope, some sort of mid 1980s Kenwood. He
emailed kenwood in japan and they send a scan of the manual. Sort of
jealous of it in fact.

** Likely has no mag shielding.

Be a real PITA if you locate a mains transformer anywhere near the tube.
Such scopes must be sited well away from the work bench and other items of test gear.

Or else the trace shimmers horribly at 50/60 Hz.
Major scam, IMO.


...... Phil

 

[Fox\'s Mercantile]

On 3/26/21 4:51 PM, Tom Del Rosso wrote:

They all have plastic cases, so why can\'t they have isolated supplies
and no earth connection?

Because ungrounded equipment is always a bad idea.

--
\"I am a river to my people.\"
Jeff-1.0
WA6FWi
http:foxsmercantile.com

 

[Fox\'s Mercantile]

On 3/26/21 4:51 PM, Tom Del Rosso wrote:

They all have plastic cases, so why can\'t they have isolated supplies
and no earth connection?

Because ungrounded equipment is always a bad idea.

--
\"I am a river to my people.\"
Jeff-1.0
WA6FWi
http:foxsmercantile.com

 

[Fox\'s Mercantile]

On 3/26/21 4:51 PM, Tom Del Rosso wrote:

They all have plastic cases, so why can\'t they have isolated supplies
and no earth connection?

Because ungrounded equipment is always a bad idea.

--
\"I am a river to my people.\"
Jeff-1.0
WA6FWi
http:foxsmercantile.com

 

[Fox\'s Mercantile]

On 3/26/21 4:51 PM, Tom Del Rosso wrote:

They all have plastic cases, so why can\'t they have isolated supplies
and no earth connection?

Because ungrounded equipment is always a bad idea.

--
\"I am a river to my people.\"
Jeff-1.0
WA6FWi
http:foxsmercantile.com

 

[Phil Allison]

Tom Del Rosso wrote:
======================

Why is it still necessary to worry about probing a floating ground?

** Errr - user safety ?

Most digital scopes have power requirements like high-end laptops, so
why can\'t they have a battery option?

** Battery scopes are potentially lethal.

They all have plastic cases, so why can\'t they have isolated supplies
and no earth connection?

** BNC plugs are metal and so are accessory connectors on the front and back.

FYI

My 1987 analogue scope ( 10x8 cm, 50MHz, dual trace) draws the same power as my 1052E

...... Phil

 

[Phil Allison]

Tom Del Rosso wrote:
======================

Why is it still necessary to worry about probing a floating ground?

** Errr - user safety ?

Most digital scopes have power requirements like high-end laptops, so
why can\'t they have a battery option?

** Battery scopes are potentially lethal.

They all have plastic cases, so why can\'t they have isolated supplies
and no earth connection?

** BNC plugs are metal and so are accessory connectors on the front and back.

FYI

My 1987 analogue scope ( 10x8 cm, 50MHz, dual trace) draws the same power as my 1052E

...... Phil

 

[Phil Allison]

Tom Del Rosso wrote:
======================

Why is it still necessary to worry about probing a floating ground?

** Errr - user safety ?

Most digital scopes have power requirements like high-end laptops, so
why can\'t they have a battery option?

** Battery scopes are potentially lethal.

They all have plastic cases, so why can\'t they have isolated supplies
and no earth connection?

** BNC plugs are metal and so are accessory connectors on the front and back.

FYI

My 1987 analogue scope ( 10x8 cm, 50MHz, dual trace) draws the same power as my 1052E

...... Phil

 

[Phil Allison]

Tom Del Rosso wrote:
======================

Why is it still necessary to worry about probing a floating ground?

** Errr - user safety ?

Most digital scopes have power requirements like high-end laptops, so
why can\'t they have a battery option?

** Battery scopes are potentially lethal.

They all have plastic cases, so why can\'t they have isolated supplies
and no earth connection?

** BNC plugs are metal and so are accessory connectors on the front and back.

FYI

My 1987 analogue scope ( 10x8 cm, 50MHz, dual trace) draws the same power as my 1052E

...... Phil

 

[RosemontCrest]

On 3/26/2021 2:51 PM, Tom Del Rosso wrote:

Why is it still necessary to worry about probing a floating ground?

Most digital scopes have power requirements like high-end laptops, so
why can\'t they have a battery option?

They all have plastic cases, so why can\'t they have isolated supplies
and no earth connection?

I believe that Tektronix still offers the TPS2000 Series.

 

[RosemontCrest]

On 3/26/2021 2:51 PM, Tom Del Rosso wrote:

Why is it still necessary to worry about probing a floating ground?

Most digital scopes have power requirements like high-end laptops, so
why can\'t they have a battery option?

They all have plastic cases, so why can\'t they have isolated supplies
and no earth connection?

I believe that Tektronix still offers the TPS2000 Series.

 

[Phil Allison]

Phil Allison wrote:
======================

FYI

My 1987 analogue scope ( 10x8 cm, 50MHz, dual trace) draws the same power as my 1052E

** Just rechecked, the Rigol uses 18W and the trusty BWD 825 only 15.

It don\'t need a noisy fan either.


..... Phil

 

[Phil Allison]

Phil Allison wrote:
======================

FYI

My 1987 analogue scope ( 10x8 cm, 50MHz, dual trace) draws the same power as my 1052E

** Just rechecked, the Rigol uses 18W and the trusty BWD 825 only 15.

It don\'t need a noisy fan either.


..... Phil