Table of Contents
Advertisement
E1437A
ASCII Overview and Commands
Description:
CLOCK:SETUP is used to configure all timing parameters used for sampling (ADC
clock) and decimation/zoom (DSP clock). This command, as well as the other
CLOCK commands covered in this description, is used to select the source and
distribution of clocking and synchronization signals used by the E1437 module. The
primary clock signal used by the module is the ADC clock, for which the rising edges
indicate the time for each sample of the analog-to-digital converter. Another clock
signal is the DSP clock, which drives the digital signal processing and memory
sections of the module. Normally the DSP clock is the same as the ADC clock, and
data is transferred synchronously from the ADC to the DSP portion of the module.
However, in certain situations the two clocks may be independent, requiring
asynchronous data transfers from the ADC to the DSP. The remaining CLOCK
commands and queries listed above set or query the parameters individually.
Parameter definitions:
SYNC signal. Modules in multi-module systems must all have the same sync
parameter setting.
parameter
(ADC) for single module operation or when a module is used as the master ADC
clock source for a multi-module system. In multi-module systems the source
parameter is ignored for all but the master module.
parameter
5-10
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
is used to specify whether the module uses a shared ADC clock and
value
0
OFF. The ADC clock and SYNC are generated locally
FRONT. The module uses the shared clock and SYNC provided on the front panel
1
distribution connectors
REAR. The module uses the shared ADC clock and SYNC signals which are distributed on
2
the VXI backplane using the ECL trigger lines
selects the clock source that is used to drive the analog to digital converter
value
0
20.48 MHz internal oscillator
1
20 MHz internal oscillator
2
EXT. TTL, ECL, or sine signal on the external, BNC, front panel clock input connector
EXT:PLL. Takes a 10 MHz reference from another instrument on the external, BNC, front
3
panel clock input connector and uses a PLL to convert it to a 20 MHz reference
multisync parameter definition
source parameter definition
CLOCK:SETUP
command/query
Advertisement
Table of Contents
