Amprobe ACD-51HP Power-Quality-Clamp-Ons - Manual (Page 20)

ACD-51HP - ACD-56HPQ
4.3.6. Frequency measurement (from the jaws)
WARNING
Before attempting any measurement disconnect all the test leads from the
circuit under test and from the meter's input terminals.
CORRECT INCORRECT
Fig. 10: frequency measurements from the jaws
1. Select the “ A
” position.
2. Press FUNC key to select Hz function.
3. Open the jaws and clamp only one cable. Pay attention to the alignment marks (see
paragraph 4.1.2. and Fig. 10). The value of frequency is shown on main display.
4. The symbol "
O.L
" means that the measured voltage is higher than the full scale of the
instrument.
5. If the display is difficult to read, press D-H key to hold the measured value. To disable
this function press the D-H key again.
6. If the measurement is being performed in a dark environment, press and hold the
key for 1 second to activate the backlight. It automatically turns OFF after 5 seconds.
7. Press FUNC key to escape this mode going back to current measurement function
(see paragraph 4.3.5).
By pressing and holding pressed MAX/MIN/PK key at least for 1 second, the instrument
activates the maximum (MAX), minimum (MIN) and average (AVG) measurements. All of
these values are continually updated even if only one of them is shown. With a simple
MAX/MIN/PK key press the values are cyclically displayed. To escape this function press
and hold the MAX/MIN/PK key at least for 1 second or turn the selector to any position.
EN - 16