HP 8510, User Manual

Page: 56 / 73

Figure 9-2.
Using External Trigger and External Modulation PRP = 10 microseconds, Duty Cycle = 50%
Figure 9-2 a is the pulse prole domain resp onse. Multiple pulses are visible b ecause the stop
time is greater than the stimulus PRP . Notice that for external triggering the minimum start
time is ab out p ositiv e 3 measuremen t resolution p erio ds with resp ect to the external trigger.
Ev en though the in ternal pulse output is not used in this particular conguration, the pulse
prole measuremen t resolution p erio d is set b y algorithm using the greater of the pulse width
and stop time.
Figure 9-2 b is the frequency domain resp onse with the trigger dela y set to measure during the
On time of the pulse.
One metho d used to set the trigger dela y to an appropriate v alue is:
1.
Press 4 DOMAIN 5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
PULSE PROFILE , then set appropriate Start and Stop times.
2.
Press 4 MARKER 5, then mov e the marker to the p oint on the pulse y ou w an t the frequency
domain measuremen t to b e made.
3. Press 4 STIMULUS MENU 5
NNNNNNNNNNNNNN
MORE
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
TRIGGER MODE
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
TRIGGER DELAY .
The curren t v alue of the trigger dela y will b e display ed. No w press 4 =MARKER 5. The time
v alue at the marker will b e assigned to the trigger dela y function.
4.
Press 4 DOMAIN 5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FREQUENCY . The trace sho ws the resp onse at the time after the TTL
T rigger In signal falling edge as set b y the trigger dela y v alue.
In y our application it may b e desirable to complemen t the pulse mo dulation and the external
trigger signals.
Using External Triggering and Pulse Modulation 9-3