Fluke 43B

Users Manual

Time resolution in Sags & Swells and Record modes.

The modes Sags & Swells and Record basically perform similar functions. In both modes Fluke 43B plots a trend of up to two electrical parameters over time. In Sags & Swells mode the instrument plots voltage and current only. In Record mode the analyzer plots a wide variety of parameters, depending on the function that is active when the Record pushbutton is pressed. In both modes the instrument plots the parameters periodically over the so-called plot interval. Refer to the table below for the relationship between Recording Time and Plot Interval. The relationship is based on the fact that there are always 240 plots across the horizontal screen width.

Recording Time

Plot Interval

Recording Time

Plot Interval

 

 

 

 

4 minutes

1 second

8 hours

2 minutes

 

 

 

 

8 minutes

2 seconds

16 hours

4 minutes

 

 

 

 

16 minutes

4 seconds

24 hours

6 minutes

 

 

 

 

30 minutes

8 seconds

48 hours

12 minutes

 

 

 

 

1 hour

15 seconds

4 days

24 minutes

 

 

 

 

2 hours

30 seconds

8 days

48 minutes

 

 

 

 

4 hours

60 seconds

Endless (16 days)

1 to 96 minutes

 

 

 

 

Fluke 43B always measures faster than the plot interval: it always is looking at multiple measurements for each point that is plotted. In fact the analyzer looks at all the measurements it has taken during a plot interval and records a minimum, maximum, and average reading. The difference between Sags & Swells and Record mode is in the measuring rate.

Sags & Swells is optimized for measuring short duration variations of current and voltage. The rms current and voltage of every line cycle are measured. The Fluke 43B then records the min (lowest single cycle), max (highest single cycle), and average measurements at the end of each plot interval.

The Record mode takes measurements roughly 250 milliseconds apart. It also records the min, max, and average during each plot interval.

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Fluke 43B user manual Time resolution in Sags & Swells and Record modes