Philips PM 6650 Operating Manual page 31

Counter/timer 512 mhz/1ns
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2.8. Period average measurement
ONDM
. Set FUNCTION switch to PERIOD AVG A.
Set DISPLAY TIME to mid-position.
Set MULTIPLIER
switch to desired
number
of pe-
riods to be averaged.
Select desired
input conditions
of channel
A (at-
tenuation, coupling, slope).
Select suitable input impedance.
Depress SEP switch.
. Connect signal to input A (O to 10 MHz).
Adjust LEVEL A control to desired trigger level or
pull knob to PRESET to trigger at zero volts.
Adjust DISPLAY TIME to a suitable value.

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