Global Specialties PB-507 - Manual - Manual (Page 14)

14
Figure 5
Unipolar/Bipolar button: The type of the input signal can be changed anytime
by pressing the Unipolar/Bipolar button.
Description
The Frequency counter module can measure the frequency of bipolar or unipolar
signals. The term unipolar indicates that the signal swings from zero (ground) or
a positive voltage to a higher voltage, and bipolar indicates that the signal swings
above and below zero (ground).
If Counter mode (configured in menu) is set to “Automatic”, the input signal type
is detected automatically, but the first measurement may take more time in this
case.
The measurement of low frequency signals requires a long time (for example, to
measure Fin = 0.2Hz, is required at least 10s for the first measurement).
The Frequency counter operation is signaled by three LEDs:
•
No signal: signal not detected
•
Done: a valid frequency is displayed on the screen. The first measurement
is not precise.
•
Counting: a new measurement is in progress.
Display Area and Screen Interface
Figure 6 shows the trainer’s screen displaying the Frequency counter panel.