LeCroy LW110 User Manual page 37

User Manual LW120
Changing the
Frequency,
Sample Clock and
Channel 2 SCLK
Divider
using these sub-menus is described later in this chapter.
1. Press the Waveform button
2. Rotate the dial counterclockwise to select between STD
(standard), ARB (arbitrary) and SEQ (sequenced) waveforms.
The displayed waveform type is automatically available at the
output connector.
LeCroy
MODEL
Waveform Type
POWER
FREQUENCY AMPLITUDE WAVEFORM
I
0
Figure 3-5. Selecting Waveform Type
The user should be careful not to confuse waveform frequency with
sample clock frequency. The waveform frequency parameter is
valid for standard waveforms only and controls waveform frequency
at the output connector. On the other hand, the sample clock
frequency parameter is valid for arbitrary waveforms only and
defines the frequency of which the generator clocks data points.
Standard waveform frequency is measured in units of Hz. Arbitrary
waveform sample clock frequency is measured in units of S/s
(samples per second). The frequency of a given arbitrary waveform
at the output connector is dependant on sample clock frequency,
the number of data points, and the specifics of the waveform
defined.
The sample clock divider is used to divide the sample clock for
channel 2. This way, each channel can have a different sample
clock rate. The sample clock is divided using integer numbers only.
Observe Figure 3-6 and modify frequency and sample clock using
the following procedure.
1. Press the FREQUENCY button
2. Select Freq, Sclk, or Divider CH2 parameter
3. Move the cursor from left to right until it appears under the digit
you want to change
2
STD.
2
ARB.
SEQ.
2
UTILITY
TRIGGER OUTPUT
1
Using The Instrument 3-7
100 MS/s ARBITRARY WAVEFORM
RESET
CURSOR
3
MAN TRIG
CHAN SYNC CHAN
1 2
! !
50 TTL 50