Advertisement
Model 5328A
Operation
500 mVDC
A INPUT
250 mVDC
0 VDC
750 mVDC
B INPUT
OPTION css
=
=<"
2a
T.AA—B
-50 mV
MARKER
Figure 3-17.
Level Control Settings
NOTE
Simple measurement of a time interval, the +LEVEL
control of the A and B input channels were used to set
the trigger LEVEL of A and B.
3-76.
Hysteresis
3-77.
The width of the hysteresis band, shown in Figure 3-18 is determined by the sensitivity of
the counter.
For frequencies below 40 MHz, it is less than 50 mV peak-to-peak. At frequencies
from 40 MHz to 100 MHz, it is less than 70 mV peak-to-peak. The signal must pass through the
entire hysteresis band before a trigger pulse is generated. If the SLOPE switch is set to "+", the
trigger pulse occurs at the top of the hysteresis band. If the SLOPE switch is set to "~", the trigger
pulse occurs at the bottom of the hysteresis band.
3-78.
Since trigger level measurements made by the Option 020 or 021 DVM indicate the center
of the hysteresis band (except for when hysteresis compensation is in effect, see Paragraph 4-32),
a better value for the actual trigger level may be obtained by subtracting one half the hysteresis
band (''~" slope) or adding one half the hysteresis band (''+" slope). A typical value for the width
of the hysteresis band is 50 mV peak-to-peak.
3-79.
The value to use for the hysteresis band depends on the frequency; or, for pulses, it
depends on the rise time.
+ SLOPE
TRIGGER
POINT
TRIGGER
70 mV TYPICAL
- SLOPE
TRIGGER
POINT
Figure 3-18.
Hysteresis Band
Advertisement
