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Fluke 28II Problem displaying Frequensy on 10A ACI

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Kiriakos-GR:
The last 20 days I  did some testing and comparisons, by using the Fluke 28II as dedicated ammeter on AC Mains,
operating - measuring ACI continuously for 20 days.

The load are three pulsing PSU ( three battery chargers  + one small refrigerator ).
The load of this line goes from 400mA AC to 950mA max.

The Fluke 28II was connected as ammeter and was capable to display the 50Hz Mains frequency when is set at the Auto range minimum 6A range,
when I use manual range AC 10A ,  the 28II is unable to display the Mains frequency and shows 00Hz.
By reading the manual there is some generic talk about triggering levels  and sensitivity.

The problem by my point of view, are that even one  load close to 1A AC (220VA), looks incapable to trigger the DMM frequency counter.
As long the User's manual does not define the minimum amount of the needed current so to trigger the frequency counter at the 10A range,
I am forced to ask publicly, and seek for one reliable answer about this issue.

Yes I did similar tests  by using the Agilent U1272A, and the DMM managed to operate and indicate the frequency at both ranges of it, like 3A and 10A  ACI with a minimum of  load of 400mA or less.

I think that the 28II activates by it self the LPF (filter by default at ACI ),  and so I activated too the LPF manually at the Agilent DMM,
so the comparison to be apples with apples.

I am open to questions if there is any.

 
   

alm:
See table 7, page 30 of the English user manual. Trigger level for the 10A AC range is 3A. Not sure why it's not mentioned in the detailed specifications.

Kiriakos-GR:
Hmm, I did spot it ..
But I am not happy about it.

ejeffrey:
Why are you upset that it works properly unless you manually set the wrong range?  Low trigger thresholds are bad as it increases the likelihood of false triggers and incorrect readings.  As long as it works on auto-ranging and works when you set the range correctly, why do you care?

Uncle Vernon:

--- Quote from: ejeffrey on August 19, 2011, 09:04:45 pm ---Why are you upset that it works properly unless you manually set the wrong range?  Low trigger thresholds are bad as it increases the likelihood of false triggers and incorrect readings.  As long as it works on auto-ranging and works when you set the range correctly, why do you care?

--- End quote ---
It's part of an ongoing vendetta against Fluke. It serves no purpose and it's far from good or clever engineering. The equivalent of complaining that the BMW M3 fails to match it's published 0-100  times when launched in a high gear.
I guess the Agilent U1272A should equally be condemned because it fails to reliably measure resistance when set to any of its current ranges. Though some would say that is just being negative.

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