I hooked up a 47k resistor from line to the 50 ohm input of my 5334B and it
just worked.
That's something I wouldn't do. It's too easy to forget to push the 50 ohm
button. I might do it if I had a handy 50 ohm terminator built into a BNC
pass through. That would be easy to verify with a
Hal,
I don't know what I'd do if i had reliable power like that. Here at work
(the lab) It's normal to see outliers of anything between 58hz and upper
63. As I had commented before, this power distribution in this area is
terrible (South Western Pennsylvania)
Steve
On Wed, Nov 30, 2011 at 3:06
On 11/30/2011 3:06 PM, Hal Murray wrote:
I hooked up a 47k resistor from line to the 50 ohm input of my 5334B and it
just worked.
That's something I wouldn't do. It's too easy to forget to push the 50 ohm
button. I might do it if I had a handy 50 ohm terminator built into a BNC
pass through.
[Context is HP 5334B inputs.]
The unit is specified to be able to handle 200 volts DC + peak AC on the
input in high impedance mode either X1 or X10.
Thanks for the heads up. Somehow, I thought they were much more delicate
than that.
--
These are my opinions, not necessarily my
PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Line Voltage frequency Interface morphed to
batteries
Hey, John, got any idea of the DC to DC converter that charged that
capacitor?
1 transistor, 1 transformer. The photoflash cap is 80uF 330 VDC.
What
I remember one tasting a battery on my tongue.
No shock, but a really nasty, bitter taste.
Not recommended.
--
Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
Omen Technology Inc The High Reliability Software
10255
Every time I follow a school bus that stops at a railroad crossing and
opens its doors to stop, look, and listen - even though there is no
sign with crossed bars saying Stop, Look, and Listen and there are
many flashing red lights when a train approaches - I think of politicians
who would not put
Recently, I took an old disposable 35mm film camera appart. It had a
flash, powered by a 1.5 V carbon-zinc AA battery. Inadvertantly, I got
across the terminals of the flash capacitor and got a hell of a shock.
Had the current gone through the right (wrong?) place, I could well be dead.
-John
Those capacitors in there can pack a wallop. I've played with various strobes
since I was very young so learned that lesson early. Short it out and see the
bang you get! (don't use your good screwdriver to do this).
Yes, I'm sure those things can be lethal.
Microwave ovens can be even
Oh, yeah, about the line interface for measurement...
I hooked up a 47k resistor from line to the 50 ohm input of my 5334B and it
just worked. I am watching the 60 Hz drift all around as I type this
(although not all that far, seems to be holding within 0.01 Hz tonight).
On 11/28/2011
, 2011 9:43 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Line Voltage frequency Interface morphed to
batteries
Recently, I took an old disposable 35mm film camera appart. It had a
flash, powered by a 1.5 V carbon-zinc AA battery. Inadvertantly, I got
across
-
From: J. Forster
Sent: Monday, November 28, 2011 9:43 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Line Voltage frequency Interface morphed to
batteries
Recently, I took an old disposable 35mm film camera appart. It had a
flash, powered by a 1.5 V
On Mon, Nov 28, 2011 at 7:42 PM, J. Forster j...@quikus.com wrote:
Recently, I took an old disposable 35mm film camera appart. It had a
flash, powered by a 1.5 V carbon-zinc AA battery. Inadvertantly, I got
across the terminals of the flash capacitor and got a hell of a shock.
Had the current
Another pathological example is the implanted pacemaker. How much
voltage does it use. I bet way less then what's inside a 9V battery.
But the location and the firm contact it makes means very little
voltage is required.
Maybe. I'd guess a 5-40 V pulse.
The 48V battery in POTS phone
: [time-nuts] Line Voltage frequency Interface morphed to
batteries
Hey, John, got any idea of the DC to DC converter that charged that
capacitor?
1 transistor, 1 transformer. The photoflash cap is 80uF 330 VDC.
What voltage did it put out?
I presume 250-300 VDC. If you really want to know I
Of J. Forster
Sent: Monday, November 28, 2011 10:41 PM
To: Chris Albertson
Cc: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Line Voltage frequency Interface morphed to
batteries
Another pathological example is the implanted pacemaker. How much
voltage does it use
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