Don Collie wrote:
> Hi Bruce and Henk,
> Your point about Bandwidth is a valid one, and as you say, it depends on
> the application.
> The 400H has corner frequencies of about 10Hz, and 4Mhz, so the noise BW is
> a bit wider than this [Y/N?]. This setup can`t measure noise at very low
> Freq
ssion of precise time and frequency measurement"
Sent: Wednesday, January 09, 2008 9:26 AM
Subject: Re: [time-nuts] How to measure regulator noise?
> Henk ten Pierick wrote:
>> On Jan 8, 2008, at 12:50, Don Collie wrote:
>>
>>
>>> I`d just hang an AC mill
Henk ten Pierick wrote:
> On Jan 8, 2008, at 12:50, Don Collie wrote:
>
>
>> I`d just hang an AC millivoltmeter[or microvoltmeter] across the
>> regulator`s
>> output.
>> I use my H/P 400H, which will give readings down to about 50uV. If
>> your
>> regulator produces less noise than this [sa
Don Collie wrote:
> I`d just hang an AC millivoltmeter[or microvoltmeter] across the regulator`s
> output.
> I use my H/P 400H, which will give readings down to about 50uV. If your
> regulator produces less noise than this [say a 723, with
> 2uV], then you`ll need a more sensitive meter.
> It mig
On Jan 8, 2008, at 12:50, Don Collie wrote:
> I`d just hang an AC millivoltmeter[or microvoltmeter] across the
> regulator`s
> output.
> I use my H/P 400H, which will give readings down to about 50uV. If
> your
> regulator produces less noise than this [say a 723, with
> 2uV], then you`ll nee
is
nearly zero.
Go to it!,..Don C.
- Original Message -
From: "Bruce Griffiths" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement"
Sent: Tuesday, January 08, 2008 10:03 AM
Subject: Re:
Poul-Henning Kamp wrote:
> In message <[EMAIL PROTECTED]>, "Dave Brown" writes:
>
>
>> John
>> You won't need much of a cap for DC blocking as inputs are hi-Ztoo
>> big and the chargeup may well trigger the overrange condition.
>>
>
> You need to put a shunt resistor after the capacito
In message <[EMAIL PROTECTED]>, "Dave Brown" writes:
>John
>You won't need much of a cap for DC blocking as inputs are hi-Ztoo
>big and the chargeup may well trigger the overrange condition.
You need to put a shunt resistor after the capacitor if the input is hi-Z
but an even better way is t
age -
From: "John Ackermann N8UR" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement"
Sent: Monday, January 07, 2008 9:17 AM
Subject: [time-nuts] How to measure regulator noise?
> I'm experimenting with some low noise regulators, an
John Ackermann N8UR wrote:
> I'm experimenting with some low noise regulators, and want to do some
> meaningful measurements to compare them (and hopefully compare to
> published specs).
>
> I have an HP 3561A FFT analyzer, which can probably be beaten these days
> by a sound card, but has the adva
y 06, 2008 2:18 PM
> To: Discussion of precise time and frequency measurement
> Subject: [time-nuts] How to measure regulator noise?
>
> I'm experimenting with some low noise regulators, and want to
> do some meaningful measurements to compare them (and
> hopefully compare
I'm experimenting with some low noise regulators, and want to do some
meaningful measurements to compare them (and hopefully compare to
published specs).
I have an HP 3561A FFT analyzer, which can probably be beaten these days
by a sound card, but has the advantage of absolute calibration and GPIB
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