Re: How to measure sub micro amps.
From: Winfield Hill (Winfield_member_at_newsguy.com)
Date: 06/26/04
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Date: 26 Jun 2004 15:27:00 -0700
John Larkin wrote...
>
> Joerg wrote:
>
>> Just as a sideline: It seems that RS232 is slowly starting to sing the
>> blues as well. Some laptops now come without RS232 ports so you'd have
>> to use a converter from USB to RS232.
>
> Any but trivial instruments should go Ethernet nowadays. GPIB is ugly
> and expensive, RS-232 is slow and won't network, USB is too short
> range.
But Ethernet is a packet-oriented standard, whereas RS-232, RS-485,
GPIB, etc., are byte or character oriented, and therefore well suited
for single-bit manipulation if needed. How is this issue dealt with by
Ethernet? Furthermore, unless unreliable UDP is used, Ethernet packets
are delivery-confirmation oriented, and they can suffer from a serious
time-uncertainty problem, with failures, lengthy retries and even long
stalls under certain presumably collision conditions. Are we required
to assume a dedicated low-usage subnet?
Thanks,
- Win
(email: use hill_at_rowland-dot-org for now)
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