Received: from PCH.mit.edu (18.7.21.50) by mail.efplus.com (192.168.0.8) with Microsoft SMTP Server (TLS) id 8.3.485.1; Wed, 9 Dec 2020 02:13:29 -0800 Received: from PCH.MIT.EDU (localhost.localdomain [127.0.0.1]) by PCH.mit.edu (8.14.7/8.12.8) with ESMTP id 0B9A35Nn016580; Wed, 9 Dec 2020 05:05:25 -0500 Received: from outgoing-exchange-1.mit.edu (OUTGOING-EXCHANGE-1.MIT.EDU [18.9.28.15]) by PCH.mit.edu (8.14.7/8.12.8) with ESMTP id 0B9A33b3016577 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Wed, 9 Dec 2020 05:03:03 -0500 Received: from w92exedge4.exchange.mit.edu (W92EXEDGE4.EXCHANGE.MIT.EDU [18.7.73.16]) by outgoing-exchange-1.mit.edu (8.14.7/8.12.4) with ESMTP id 0B9A33do019148 for ; Wed, 9 Dec 2020 05:03:03 -0500 Received: from w92exhyb1.exchange.mit.edu (18.7.71.12) by w92exedge4.exchange.mit.edu (18.7.73.16) with Microsoft SMTP Server (TLS) id 15.0.1293.2; Wed, 9 Dec 2020 05:02:07 -0500 Received: from oc11exhyb8.exchange.mit.edu (18.9.1.113) by w92exhyb1.exchange.mit.edu (18.7.71.12) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Wed, 9 Dec 2020 05:03:02 -0500 Received: from NAM12-BN8-obe.outbound.protection.outlook.com (104.47.55.176) by oc11exhyb8.exchange.mit.edu (18.9.1.113) with Microsoft SMTP Server (TLS) id 15.0.1395.4 via Frontend Transport; Wed, 9 Dec 2020 05:03:02 -0500 Received: from DM6PR11CA0025.namprd11.prod.outlook.com (2603:10b6:5:190::38) by CH2PR01MB5925.prod.exchangelabs.com (2603:10b6:610:40::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3632.21; Wed, 9 Dec 2020 10:03:01 +0000 Received: from DM6NAM11FT029.eop-nam11.prod.protection.outlook.com (2603:10b6:5:190:cafe::42) by DM6PR11CA0025.outlook.office365.com (2603:10b6:5:190::38) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3654.12 via Frontend Transport; Wed, 9 Dec 2020 10:03:01 +0000 Received: from mail-yb1-f176.google.com (209.85.219.176) by DM6NAM11FT029.mail.protection.outlook.com (10.13.173.23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3632.17 via Frontend Transport; Wed, 9 Dec 2020 10:03:01 +0000 Received: by mail-yb1-f176.google.com with SMTP id r127so764819yba.10 for ; Wed, 09 Dec 2020 02:03:01 -0800 (PST) From: Manu Abraham To: Microcontroller discussion list - Public. Sender: "piclist-bounces@mit.edu" Date: Wed, 9 Dec 2020 02:02:46 -0800 Subject: Re: [EE] Eliminating external noise through PS Thread-Topic: [EE] Eliminating external noise through PS Thread-Index: AdbOE/EDqcn/AJefQE+hkAwD3rbKwA== Message-ID: References: <5FCFC00E.8040703@narwani.org> List-Help: List-Subscribe: , List-Unsubscribe: , In-Reply-To: Reply-To: Microcontroller discussion list - Public. Accept-Language: en-US X-MS-Exchange-Organization-AuthAs: Anonymous X-MS-Exchange-Organization-AuthSource: TS500.efplus4.local X-MS-Has-Attach: X-Auto-Response-Suppress: All X-MS-Exchange-Organization-SenderIdResult: TempError X-MS-Exchange-Organization-PRD: mit.edu X-MS-TNEF-Correlator: received-spf: Pass (protection.outlook.com: domain of gmail.com designates 209.85.219.176 as permitted sender) receiver=protection.outlook.com; client-ip=209.85.219.176; helo=mail-yb1-f176.google.com; dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=CNB+2DbwDK9OzDN8VniuvbbJfLCIjN9lTXS4vQnvSMc=; b=StyE8ovmHGvLvw2rd6/n6GpS3mN+i7lVxoG8Mw2920bXM69woDDlStp+x5mL9SEaCp dZEx9JC4irha0uBFNz8FXViFd3yu3hmPcfZmQGPBsNJ7n1M35Uzh64Qzgsy+G+wLEUzL MFOlG4AIN2gu/mHb1qHhME9oLUjz6i3VUTMHjwmOqVBkTaMFRmTrJ0uk0/dOF5jRWgt2 NQuB6fdRrps842JcKJe5flT8kl2Iz+PKQEYKZchH82ZnlgO07uKJUV97nIEeVzA8ianO ruD5JVkYQgWB30M51ponxbZm5W2OvzX0E/MtuPNdMS7/E8ohUXiB4pDHHiTtZcBQ5x31 MikA== authentication-results: spf=pass (sender IP is 209.85.219.176) smtp.mailfrom=gmail.com; mit.edu; dkim=pass (signature was verified) header.d=gmail.com; mit.edu; dmarc=pass action=none header.from=gmail.com; errors-to: piclist-bounces@mit.edu list-id: "Microcontroller discussion list - Public." list-post: x-beenthere: piclist@mit.edu x-mailman-version: 2.1.6 x-received: by 2002:a25:4608:: with SMTP id t8mr2543644yba.497.1607508180769; Wed, 09 Dec 2020 02:03:00 -0800 (PST) x-topics: [EE] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 On Wed, Dec 9, 2020 at 3:09 PM Ryan O'Connor wrote: > > Are you able to switch back to the old pump and take the same noise > measurements? I find it hard to believe that such strong filtering would > not virtually eliminate noise at that frequency... Unless .. The noise is Common Mode .., in all likelihood. Best Regards, Manu --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .