HP 8082A Operating And Service Manual page 18

EXT W1DTi-i OPERATING MODE
In External Width mode, the pulse repetition
3-21
rate and width are determined by the repetition rate and
width (at the threshold set by the EXT iNPUT LEVEL
control) of an externally applied
mode the PULSE PERIOD controls, the PULSE DELAY
controls, the PULSE WIDTH controis and the
NORMAL PULSE switch have no effect on the pulse
output. To obtain an output similar to that in Figure
3-5, adjust the controls as shown below.
that the controls are already set-up as described above
for a Normal pulse; therefore only the alterations to these
control settings will be given.
EXTERNAL
SIG:: -- L
TRIGGER
OUTPUT
PULSE
OUTPUT
o v
Figure 3-4. Pulse Output in NORM Mode
a. Set the Mode switch @ to EXT WIDTH.
b. Apply an external trigger to the EXT
INPUT @
foliowing
Pulse shape - sine or square wave
Amplitude - between 2QOmV and CjV
Frequency - 74kHz
c. Set the EXT r'NPUT LEVEL @ control
as required to vary the switching threshold.
d. Set the SLOPE/POLARITY switch as re-
quired to trigger off the- rising iPOSf or failing
TRIGGER
LEVEL
. The input should have the
characteristics: