User Manual LW120
4. Use the dial to modify the parameter. The output waveform is
updated immediately as you rotate the dial however, note that
frequency has an affect on standard waveforms and sample
clock and the divider parameters affect arbitrary and sequenced
waveforms only.
!
50
TTL
POWER
I
0
OUTPUT
LeCroy
MODEL
100 MS/s ARBITRARY WAVEFORM
!
50
CHAN
1
SYNC
CHAN
2
RESET
CURSOR
MAN
TRIG
TRIGGER
AMPLITUDE
FREQUENCY
UTILITY
WAVEFORM
2
4
1
2
2
3
Figure 3-6. Modifying Frequency, Sample Clock and Channel 2
Sample Clock Divider
Freq 1.0000000MHz
Sclk 64.000000MS/s
Divider CH2 1
Programming the
Amplitude and
Offset
Output amplitude and offset can be programmed separately for
each channel. Amplitude and offset are set within windows, so
before you select values for these parameters, make sure that you
do not exceed amplitude and offset limits.
The LW120 has fine offset adjustment, which expands the offset
resolution to nearly 19 bits. The fine offset does not depend on
amplitude-offset ranges so it could be applied at any value. For
example, you have 4V amplitude and 1.100V offset. Fine offset
setting of 50
µ
V will give you an output offset of 1.10005V. This
feature is extremely useful in applications where tiny null offsets are
required, for example, balancing mixer inputs.
The relationship between amplitude and offset is defined using the
following equation:
Offset
Amplitude
Window
+
≥
2
Table 3-4 summarizes the various amplitude ranges and their
respective amplitude windows and offset ranges. Note that offset
resolution is different between basic LW120 and with LPCM option
installed.
Using The Instrument 3-8