Brief Directions For Different Operating Modes - Philips PM 5775 Manual

3. BRIEF DIRECTIONS FOR DIFFERENT OPERATING MODES
3.4.
2.
Internal single pulse operation
— Release switches CONT. GATED, S6, SINGLE.DOUBLE, S7, and NORM./INV.,
S8, (positions CONT., SINGLE and NORM.).
~ Set control DC OFFSET IN 50 Q, RV4, to OV.
— Set switch DELAY, S2, to 5 ns and turn its FINE control, RV2, fully counter-
clockwise.
— Set switch REPETITION TIME, S1, to the required value and check that the
pulse width is less than half the repetition time.
— Set switch AMPLITUDE IN 50 Q, S4, to required level and polarity. If necessary,
adjust with the FINE control, RV4.
- Connect PULSE OUT, P3, to the test object via a 50 Q termination (e.g. 3 W,
50 2 termination PM 9581).
— Ifrequired, depress switch NORM. INV., S8, to obtain inverted pulses.
Internal double-pulse operation
— Release switches CONT. GATED, S6, and NORM. INV., S8, (positions CONT.
and NORM.).
— Depress switch DOUBLE, S7.
— Check that the relationship between pulse width, delay time and repetition time
is correct (ty < tq <T). See Figure VI-6.
The duty cycle is less than 50 %o in normal operation.
Control the distance between the twin pulses by turning FINE control RV2.
Internal operation, externally gated
~ Depress switch CONT. GATED, S6, (position GATED).
— Set DC OFFSET IN 50 Q, RV4, to 0 V.
— Choose the required amplitude and polarity of the output pulse with switch
AMPLITUDE IN 50 2, S4, and vernier RVS.
— Select normal or inverted mode with switch NORM. INV., S8.
+ Set switch DELAY, S2, to 5 ns and turn FINE control RV2 fully counter-
clockwise.
— Apply the external gating signal from another pulse generator to input TRIGG./
GATE IN, P1.
Input amplitude > +1,2 V.
~— Select the pulse width in accordance with the repetition. time.
— Figure VI-7 illustrates the correct relationship between the time settings of the
PM 5775 (PM 5776) and the external pulse source.
If gated double-pulse operation is required check also the conditions for double
pulse mode (paragraph B.2.).
Because of internal synchronisation the PM 5775 (PM 5776) frequency and the
external gating frequency are automatically locked to ensure jitter-free operation.