FUNCTION AND RANGE
HINTS AND COMMENTS
When the indicator in the button is OFF, the signal is un-at-
tenuated; the trigger level range is –5 V to +5 V and the
sensitivity can be 0.02, 0.05 or 0.1 V.
When the indicator is ON the signal is attenuated 10 times;
the Trigger level range becomes –50 V to +50 V and the
sensitivity becomes be 0.2 V, 0.5 or 1.0 V.
If Auto Level or Volt is selected, the correct attenuator
setting will be selected automatically.
When the button indicator is ON, the active slope of the in-
put is changed from positive to negative.
Dual functions:
1)
AC- or DC- coupled input.
2)
Selection of variable sensitivity (AC) with 0 V trigger
level or selection of variable trigger level (DC) with maxi-
mum sensitivity.
NOTE: AC coupling together with Auto Level results in
maximum sensitivity and automatic trigger level setting.
You can remove any DC-component with AC-coupling.
For frequency, period, and ratio measurements: Select AC-
coupling and set the sensitivity so that the hysteresis band
of the Timer/Counter is about half the amplitude of the input
signal.
For time measurements: Select DC-coupling and set the
trigger level to the desired level.
The auto-level function always sets the DC trigger-level to
50% of the amplitude, it does also switch on the attenuators
when needed. Auto-level is selected simultaneously for both
A and B inputs.
The measuring rate is reduced to about two measurements/
second when using Auto-Level.
The sensitivity is decreased to 150 mVpp, and the minimum
frequency is 100Hz.
NOTE: Auto level gives automatic trigger level setting to AC
coupled inputs also.
Use Read-Level to check what trigger-levels Auto-Level has
selected.
For frequency, period, and ratio measurements:
Select AC-coupling and set the sensitivity so that the hyster-
esis band of the Timer/Counter is about half the amplitude
of the input signal.
For time measurements:
Select DC-coupling and set the trigger level to the desired
level.
If the sensitivity is too high, the Timer/Counter will be
triggered by noise and interference instead of by the signal.
OPERATING INSTRUCTIONS
Page: 19
PM 6666 - OPERATORS MANUAL
