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<blockquote data-quote="thch" data-source="post: 5153587" data-attributes="member: 562032">The model you show has an AC-Volts option listed, and should function as a DMM in that regard.&nbsp; as such, you can set gains using this setting and the normal probes.using the clamp function for setting gains is not practical.&nbsp; you would need to have a speaker or test load hooked up.&nbsp; the impedance of the speaker likely won&#039;t be exactly 4ohm, or 1ohm, or whatever.&nbsp; the amplifier trys to control the output voltage and provide whatever current is required for that.&nbsp; this is why going from 4ohm to 2ohm provides 2x power, and not the other way around.the clamp is more often used with the DMM to measure the impedance (magnitude) of the speaker.&nbsp; Also it can be used to better estimate actual power.&nbsp; A few other technicalities prevent it from being perfectly accurate. (no measure of distortion, no measure of phase differences between voltage and current)</blockquote>

[QUOTE="thch, post: 5153587, member: 562032"] The model you show has an AC-Volts option listed, and should function as a DMM in that regard. as such, you can set gains using this setting and the normal probes. using the clamp function for setting gains is not practical. you would need to have a speaker or test load hooked up. the impedance of the speaker likely won't be exactly 4ohm, or 1ohm, or whatever. the amplifier trys to control the output voltage and provide whatever current is required for that. this is why going from 4ohm to 2ohm provides 2x power, and not the other way around. the clamp is more often used with the DMM to measure the impedance (magnitude) of the speaker. Also it can be used to better estimate actual power. A few other technicalities prevent it from being perfectly accurate. (no measure of distortion, no measure of phase differences between voltage and current) [/QUOTE]

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