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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Extech AC/DC Clamp Meter Offset
I have an Extech 380652 that seems to work well in general but has
an approximately 0.06 A offset in the AC Amps mode on the 20 A range. The user offset adjust pot only works on DC Amps. Does anyone know if any of the 3 pots inside are for the AC amps offset? Thanks! -- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#2
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Extech AC/DC Clamp Meter Offset
"Samuel M. Goldwasser" wrote in message ... I have an Extech 380652 that seems to work well in general but has an approximately 0.06 A offset in the AC Amps mode on the 20 A range. The user offset adjust pot only works on DC Amps. Does anyone know if any of the 3 pots inside are for the AC amps offset? Thanks! -- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Not just extraneous pickup from building wiring maybe ? Probably not, but just a thought ... Arfa |
#3
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Extech AC/DC Clamp Meter Offset
Arfa Daily wrote:
"Samuel M. Goldwasser" wrote in message ... I have an Extech 380652 that seems to work well in general but has an approximately 0.06 A offset in the AC Amps mode on the 20 A range. The user offset adjust pot only works on DC Amps. Does anyone know if any of the 3 pots inside are for the AC amps offset? Thanks! -- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Not just extraneous pickup from building wiring maybe ? Probably not, but just a thought ... Arfa The op should be lucky its down that low on AC. I have an extech my self (different model), that seems to have a undocumented feature that appears to calibrate the AC mode of the clamp when I hold down one of the buttons for like 4 secs or more. |
#4
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Extech AC/DC Clamp Meter Offset
Jamie t writes:
Arfa Daily wrote: "Samuel M. Goldwasser" wrote in message ... I have an Extech 380652 that seems to work well in general but has an approximately 0.06 A offset in the AC Amps mode on the 20 A range. The user offset adjust pot only works on DC Amps. Does anyone know if any of the 3 pots inside are for the AC amps offset? Thanks! -- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Not just extraneous pickup from building wiring maybe ? Probably not, but just a thought ... Arfa The op should be lucky its down that low on AC. I have an extech my self (different model), that seems to have a undocumented feature that appears to calibrate the AC mode of the clamp when I hold down one of the buttons for like 4 secs or more. This is a pretty basic model, no buttons, only 3 slide switches. And to Arfa's question, no not stray fields. Thanks! -- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#5
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Extech AC/DC Clamp Meter Offset
In article ,
Samuel M. Goldwasser wrote: I have an Extech 380652 that seems to work well in general but has an approximately 0.06 A offset in the AC Amps mode on the 20 A range. The user offset adjust pot only works on DC Amps. Does anyone know if any of the 3 pots inside are for the AC amps offset? 0.3% of FSD error? Isn't that quite good for this sort of device? One I have is quoted at +/-2%. Of course with a constant error there's always the temptation to sort it out. But looking at the spec of that one, it's +/- 1.2%FS -- *Avoid clichés like the plague. (They're old hat.) * Dave Plowman London SW To e-mail, change noise into sound. |
#6
Posted to sci.electronics.repair
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Extech AC/DC Clamp Meter Offset
"Dave Plowman (News)" writes:
In article , Samuel M. Goldwasser wrote: I have an Extech 380652 that seems to work well in general but has an approximately 0.06 A offset in the AC Amps mode on the 20 A range. The user offset adjust pot only works on DC Amps. Does anyone know if any of the 3 pots inside are for the AC amps offset? 0.3% of FSD error? Isn't that quite good for this sort of device? One I have is quoted at +/-2%. Of course with a constant error there's always the temptation to sort it out. If it were the clamp-on DC range, it would be good. But the AC clamp-on is just a transformer secondary. It SHOULD read 0 with nothing there! -- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#7
Posted to sci.electronics.repair
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Extech AC/DC Clamp Meter Offset
In article ,
Samuel M. Goldwasser wrote: 0.3% of FSD error? Isn't that quite good for this sort of device? One I have is quoted at +/-2%. Of course with a constant error there's always the temptation to sort it out. If it were the clamp-on DC range, it would be good. But the AC clamp-on is just a transformer secondary. It SHOULD read 0 with nothing there! If it were just a plain winding that might be so. But it has to open to allow fitting round a cable. -- *INDECISION is the key to FLEXIBILITY * Dave Plowman London SW To e-mail, change noise into sound. |
#8
Posted to sci.electronics.repair
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Extech AC/DC Clamp Meter Offset
"Dave Plowman (News)" writes:
In article , Samuel M. Goldwasser wrote: 0.3% of FSD error? Isn't that quite good for this sort of device? One I have is quoted at +/-2%. Of course with a constant error there's always the temptation to sort it out. If it were the clamp-on DC range, it would be good. But the AC clamp-on is just a transformer secondary. It SHOULD read 0 with nothing there! If it were just a plain winding that might be so. But it has to open to allow fitting round a cable. Same offest open or closed. This meter is in mint condition, no visible damage anywhere. -- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
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