Ripple : Ripple Rate; Peak : Peak Value; Hz : Frequency; Thdf : Cbema Factor - Chauvin Arnoux F27 Manual De Instrucciones

4.13 RIPPLE : Ripple rate

Accessible only in DC mode, on voltages and currents
Reminder :

4.14 PEAK : Peak value

- The current PEAK value (100 ms) corresponds to the average of the 4 greatest 100 ms samples, of the
same sign.
- When PEAK is selected, the
sign (see figures A, B and C). If these buttons are not pressed, the PEAK value displayed corresponds to
the greatest absolute value measured, positive or negative.
NB : The PEAK MAX value (≥ 2 ms) is accessible in RECORD mode.

4.15 Hz : Frequency

- Press this button briefly once: Hz is displayed
The top display gives the frequency of the current or the voltage measured.
- A second press: return to the previous function.
NB : Frequency is accessible on harmonic measurement; in this case it is displayed in place of the order of
each harmonic.
On power measurement, it is the frequency of the voltage that is displayed.

4.16 THDF : CBEMA factor

Accessible on currents, in modes AC and AC + DC, with the "yellow" button.
Reminder : the CBEMA factor allows the establishment, in an empirical way, of the derating factor of the
nominal power of a transformer as a function of the crest factor of the current supplied.
NB : THDF means Transformer Harmonics Derating Factor
RIPPLE = peak value - trough value
Figures A, B and C: Peak value with ± sign:
Figure A: AC signal
A or V
PEAK +
(>0)
0
-
PEAK
(<0)
Figure B: Signal with positive DC component
A or V
PEAK + (>0)
-
PEAK (>0)
0
Figure C: Signal with negative DC component
0
PEAK +
(<0)
-
PEAK
(<0)
A or V
and
THDF =
Crest factor
average value
PEAK + and PEAK -
PEAK MAX +
(>0)
PEAK MAX
(<0)
t
PEAK MAX +
(<0)
PEAK MAX
(<0)
buttons make it possible to respectively allocate the "+" and the "-"
√ 2
29
t
-
PEAK MAX +
(>0)
-
PEAK MAX
(>0)
t
-