Philips PM3320 Operating Manual page 59

4-39E
7 SLOPE + -
Detection of events or external clock pulses on either the positive or the negative
slope of the input signal on the EV/EXT CLK input can be selected. The selected
function is displayed intensified.
Pushing the softkey changes the selection from + to - or reverse. This is also
indicated by the pilot lamp in the pushbutton NEGATIVE SLOPE.
8 RETURN
After pushing softkey RETURN, menu TRIGGER COUPLING is displayed again.
The selections as made before remain and the trigger level potentiometer is
operative.
in the TRIGGER COUPLING menu, the pilot lamp of the pushbutton NEGATIVE
SLOPE now indicates the trigger slope.
LF REJECT
With LF REJECT selected, low frequency trigger signals (up to 50 kHz) are blocked. Only
possible if the trigger input is AC coupled.
HF REJECT
With HF REJECT selected, high frequency trigger signals (> 50 kHz) are blocked.
SLOPE + -
With this softkey, triggering on the positive or on the negative slope of the signal can be
selected: SLOPE + - overrules DUAL selection.
DUAL
After selection of DUAL triggering, the instrument is able to trigger on either the positive or
the negative slope of the signal. The level (positive and negative) can be adjusted by the
level potentiometer.
This DUAL function is specially usefuil in the SINGLE-shot mode.
DUAL can not be selected in the time base range 100 ns/div...5ns/div and the text DUAL
is not displayed then. If DUAL is selected and this time base range is entered, a message
DUAL slope not possible in SAMPLING.
DUAL switched off.
is displayed.