Portable Oscilloscope
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From: Bret Cahill on 27 Jul 2010 13:36 The markings on the housing of the 120 / 240 v ac Protek P-3502C don't say anything about power consumption, only to use a 1 amp fuse. The web page claims the newer models at least are low power or energy efficient so I hooked it up to an $8.00, 60 watt inverter on a 12 v 22 amp hr lead acid gel cell. It only drew 1.5 amps from the battery but the trace looked blurry and couldn't be adjusted. I hooked up another gel cell in parallel but the current and trace didn't change a bit. I then plugged it back into 120 ac and the trace was back in focus. Do oscilloscopes require a special sine wave inverter? Bret Cahill
From: Bret Cahill on 27 Jul 2010 13:56 > The markings on the housing of the 120 / 240 v ac Protek P-3502C don't > say anything about power consumption, only to use a 1 amp fuse. The > web page claims the newer models at least are low power or energy > efficient so I hooked it up to an $8.00, 60 watt inverter on a 12 v 22 > amp hr lead acid gel cell. > > It only drew 1.5 amps from the battery but the trace looked blurry and > couldn't be adjusted. I hooked up another gel cell in parallel but > the current and trace didn't change a bit. I then plugged it back > into 120 ac and the trace was back in focus. > > Do oscilloscopes require a special sine wave inverter? Seems the brightness needs to be turned all the way down when on the inverter. Bret Cahill
From: Tom Biasi on 27 Jul 2010 14:30 "Bret Cahill" <BretCahill(a)peoplepc.com> wrote in message news:4da51516-38bf-4f45-8294-17616508874d(a)h40g2000pro.googlegroups.com... > The markings on the housing of the 120 / 240 v ac Protek P-3502C don't > say anything about power consumption, only to use a 1 amp fuse. The > web page claims the newer models at least are low power or energy > efficient so I hooked it up to an $8.00, 60 watt inverter on a 12 v 22 > amp hr lead acid gel cell. > > It only drew 1.5 amps from the battery but the trace looked blurry and > couldn't be adjusted. I hooked up another gel cell in parallel but > the current and trace didn't change a bit. I then plugged it back > into 120 ac and the trace was back in focus. > > Do oscilloscopes require a special sine wave inverter? Seems the brightness needs to be turned all the way down when on the inverter. Bret Cahill The output of that inverter is far from adequate for electronics equipment. Tom
From: Joerg on 27 Jul 2010 18:24 Tom Biasi wrote: > "Bret Cahill" <BretCahill(a)peoplepc.com> wrote in message > news:4da51516-38bf-4f45-8294-17616508874d(a)h40g2000pro.googlegroups.com... >> The markings on the housing of the 120 / 240 v ac Protek P-3502C don't >> say anything about power consumption, only to use a 1 amp fuse. The >> web page claims the newer models at least are low power or energy >> efficient so I hooked it up to an $8.00, 60 watt inverter on a 12 v 22 >> amp hr lead acid gel cell. >> >> It only drew 1.5 amps from the battery but the trace looked blurry and >> couldn't be adjusted. I hooked up another gel cell in parallel but >> the current and trace didn't change a bit. I then plugged it back >> into 120 ac and the trace was back in focus. >> >> Do oscilloscopes require a special sine wave inverter? > > Seems the brightness needs to be turned all the way down when on the > inverter. > > > Bret Cahill > > The output of that inverter is far from adequate for electronics equipment. > Not necessarily. I have used "power supplies from hell" when I had no choice. Older CRT oscilloscopes have a regular transformer-based power supply and they often aren't very happy with the "modified sine wave" from cheap converters. Tube voltages may be lower and you can't get proper focus, and there is always a risk something goes ... *PHUT*. But I never had it happen, just a little sub-par performance. The same goes for fan motors. When the power fails and I use an inverter for our stove fans I have to crank the speed control much higher. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Tom Biasi on 28 Jul 2010 07:11
"Joerg" <invalid(a)invalid.invalid> wrote in message news:8b94lpFhsbU1(a)mid.individual.net... > Tom Biasi wrote: >> "Bret Cahill" <BretCahill(a)peoplepc.com> wrote in message >> news:4da51516-38bf-4f45-8294-17616508874d(a)h40g2000pro.googlegroups.com... >>> The markings on the housing of the 120 / 240 v ac Protek P-3502C don't >>> say anything about power consumption, only to use a 1 amp fuse. The >>> web page claims the newer models at least are low power or energy >>> efficient so I hooked it up to an $8.00, 60 watt inverter on a 12 v 22 >>> amp hr lead acid gel cell. >>> >>> It only drew 1.5 amps from the battery but the trace looked blurry and >>> couldn't be adjusted. I hooked up another gel cell in parallel but >>> the current and trace didn't change a bit. I then plugged it back >>> into 120 ac and the trace was back in focus. >>> >>> Do oscilloscopes require a special sine wave inverter? >> >> Seems the brightness needs to be turned all the way down when on the >> inverter. >> >> >> Bret Cahill >> >> The output of that inverter is far from adequate for electronics >> equipment. >> > > Not necessarily. I have used "power supplies from hell" when I had no > choice. Older CRT oscilloscopes have a regular transformer-based power > supply and they often aren't very happy with the "modified sine wave" > from cheap converters. Tube voltages may be lower and you can't get > proper focus, and there is always a risk something goes ... *PHUT*. But > I never had it happen, just a little sub-par performance. > > The same goes for fan motors. When the power fails and I use an inverter > for our stove fans I have to crank the speed control much higher. > > -- > Regards, Joerg > OK so you partially disagree that the inverter is inadaquate then go on to tell me how your use was less than satifactory. |