Delayed Time Base Generator; Miscellaneous - Philips PM 3214 Instruction Manual

19
-- 2.2.5 Delayed time base generator
LEVEL
Continuously variable control to select over a fixed range the level
SLOPE (IN +, OUT —) of the triggering signal at which the time base generator starts.
~-^ This control incorporates apush-pull switch, which enables choice
of triggering on the positive or negative going edge of the triggering
signal.
-.
...
...
.~
..
A
A
1
Trigger mode switch Function
AC — DC
2-way pushbutton switch selecting the trigger mode
AC Normal triggering and fixed range of the LEVEL control. The DC
component of the trigger signal is blocked.
DC
Normal triggering and fixed range of LEVEL control. The DC
component of the trigger signal is passed.
DELAY TIME Continuously variable vernier control of the delay time, together
with the TIME/DIV
controls of the main time base generator.
Trigger source switch Function
A — B —EXT —MTB 4-way pushbutton switch selects the trigger source and starting
point of delayed time base. No pushbutton depressed has the same
effect as the MTB button depressed.
A Internal triggering
Signal derived from channel A.
B Internal triggering
Signal derived from channel B.
A B Composite signal, derived after the electronic channel switch.
~-COMPJ
Triggering occurs on the displayed waveform, after selected delay
time.
EXT
Triggering on an external signal connected to the adjacent
1MS2//20pF socket.
MTB
Internal triggering signal derived from the main time base to start
the delayed time base immediately after the selected delay time.
TIME/DIV (outer switch) Selects the time coefficient from 2µs/d
iv to 1 ms/div in a 1-2-5
sequence. Incorporates an OFF position by which the delayed
time base generator is switched off.
TIME/DIV (inner knob) Continuously variable control of the time coefficients. Must be in
the CAL position (i.e. fully clockwise) for the time axis to be
calibrated according to the indication of the TIME/DIV switch.
1
MSZ — 20 pF BNC socket for external triggering signal.
2.2.6 PAiscellaneous
CAL Output socket supplying squarewave voltage = 2 kHz at an amplitude
of 1.2 V p-p± 1%. To be used for probe compensation and/or
checking vertical deflection accuracy.
DC POWER IN Input socket at the rear of the instrument allows operation by an
external d.c. supply. Rated supply voltage 22 V to 27 V, current
capability > 1A.
LINE (MAINS) VOLTAGE Must be set according to section 2.1.2 before the instrument is
ADAPTOR connected to the local mains voltage.