[Amps] Dummy Loads & Wattmeters

[DF3KV]

No, first you have to deduct the reflected power from the forward power and
your reading should be as near as possible to full scale for best accuracy.
By using a 2500W slug your reading might be far off from the truth.

73
Peter 

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of David C. Hallam
Sent: Donnerstag, 3. Dezember 2009 14:40
To: Dennis OConnor
Cc: amps at contesting.com
Subject: Re: [Amps] Dummy Loads & Wattmeters

My original posting has garnered a lot of interesting discussion.  To 
reduce everything to the simplest what I am trying to determine is;

If I measure the output of an amp into a dummy load with a measured DC 
resistance of 69/70 ohm using a Bird 43 wattmeter and I read 550W, can I 
have confidence that this reading is within +/-10% of actual?