8
●
PF
(Total Power Factor) displays simultaneously in the secondary mini display.
Denoting efficiency, absolute PF value is adopted.
●
“
A-lags
” LCD annunciator turns on to indicate an
inductive
circuit, or
Current A lags
Voltage V
(i.e., phase-shift angle
θ
is “+”).
On the contrary, together with significant PF values, WITHOUT “
A-lags
” turn on to
indicate a
capacitive
circuit, or
Current A leads Voltage V
(i.e., phase-shift angle
θ
is
“-”).
Note:
1. When measuring load circuits with power absorptions as in most applications, positive
W (Real Power) readings indicate correct measurement setups. Negative readings (LCD
annunciator “
-
“ turns on) indicate either the clamp-on jaws direction or the test leads
polarity is reversed in such cases. Correct the setups to get proper “A-lags” indications.
2. When encountering largely distorted waveforms, “A-lags” detection might be affected
due to the influence of harmonics. As mentioned, it is recommended to deal with (e.g.
filter out) harmonics before correcting phase-shift problems.
●
Measuring One or Single Phase Power Parameters: