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| To: | <[email protected]> |
|---|---|
| Subject: | LF: Re: FET RDS |
| From: | "James Moritz" <[email protected]> |
| Date: | Fri, 14 Jan 2011 00:50:51 -0000 |
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| References: | <003801cbb33e$8b59e620$0401a8c0@xphd97xgq27nyf> <D9D2BC233E6248D095857032DE0B8974@JimPC> <004001cbb349$8b4ec190$0401a8c0@xphd97xgq27nyf> <[email protected]> <[email protected]> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
Dear Chris, Stefan, LF Group,The high current ranges on DMMs often have considerably poorer accuracy than the DC volts ranges. Another source of power measurement error is the dummy load; both its actual resistance value at the operating frequency, and, with high RF powers, the change in resistance due to temperature rise will cause changes in RF output and/or measurement errors. I have an old Bird 1kW load that appears to change resistance by a few percent when running at maximum rating. Cheers, Jim Moritz73 de M0BMU |
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