Philips 6652C - Page 24

PHILIPS
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10mVrms .. MAX 12Vrms
TRIGGER LEVEL
The trigger level is set in one of three ways:
In AUTO mode the counter automatically cal-
culates the 50% level of the input signal, or
sets trigger levels at 10% and 90% of the
signal's amplitude. AUTO is automatically se-
lected immediately after power on unless a
program
dictates otherwise.
Via KEYBOARD the trigger levels may be set
either from a stored panel program or manual-
ly from the keybord.
Via the potentiometers (both AUTO and KEY-
BOARD are off). Potentiometer values cannot
be stored in a stored panel program.
Trigger LEOs
The trigger level is adjustable between +5V and
-5V, or between +50V and -50V (ATT x10). The
LEDs show the state of triggering:
- ON - the signal is above the trigger
level.
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- OFF
- BLINKING
READ
~ 1
the signal is below the trigger
level.
the signal is crossing the hy-
steresis band.
Shows the current trigger levels. Channel A on
the left hand side and channel B on the right
hand side of the display.
COM'non
Connects channels A and B internally and disab-
les the channel B connector and impedance
(1 MOhm/50 Ohm) control. The coupling, attenua-
tion, slope and trigger level controls for chan-
nel B remain active.
CHECK
When active, the internal 10MHz reference signal
is connected to the logic circuits. CHECK allows
a self test of all functions except phase, duty
factor, Vmax, Vmin and Vpp.
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