MP7505 Series User Manual
Counter
The frequency counter measures signals in the frequency range from 100 mHz to 200
MHz. The 10MHz In/Out/Counter connector on the rear panel is used by default to
receive the frequency counter input signal. The frequency meter works from the
start, unless the connector is set to an external clock input or clock output.
(1) Press the front panel Counter function key to enter the frequency counter
interface.
(2) Connect the signal to be tested to the 10MHz In/Out/Counter connector on the
rear panel.
(3) Set the frequency counter:
Press the Coupling softkey to switch between AC and DC, to set the coupling
mode of the input signal.
Press the Sensitivity softkey to toggle between Low, Middle or High. For
small amplitude signals, the sensitivity is selected to be middle or high. For
low frequency large signals or signals with slow rising edges, low sensitivity
is selected and the measurement results are more accurate.
Press the HFR softkey to toggle On or Off high frequency rejection.
High-frequency rejection can be used to filter high-frequency factors when
measuring low-frequency signals, improving measurement accuracy. When
measuring low frequency signals with a frequency less than 1 kHz, turn on
high frequency rejection to filter out high frequency noise interference; turn
off high frequency rejection when measuring high frequency signals with
frequencies greater than 1 kHz.
Press the Trigger Level softkey. Turn the rotary control to change the
current cursor position value, press the arrow keys to move the cursor left
or right; or use the numeric keypad to enter a value and then select the
desired unit from the right menu. The trigger level ranges from -2.5 V to 2.5
V.
After the setting is completed, the frequency counter will measure the signal to
be tested at the current setting. If the reading is unstable, repeat the above
adjustment until the display is stable.
(4) The frequency, period, duty cycle, positive pulse width, and negative pulse width
can be viewed on the frequency meter interface. If it is not currently in
frequency counter interface, the frequency, period and duty cycle can be viewed
in the frequency counter bar at the bottom of the screen.
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