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2. Pre- and Post-Arm Sample Rates. With dual rate sampling, pre-arm
and post-arm readings occur at different sample rates. It is recommended
that pre-arm readings use the faster of the two sample rates. The reason is
once the arm is received, one addtional sample at the pre-arm rate must
occur before the post-arm rate is used.
3. Dual Rate Sampling Reference Sources. The reference sources
available with trigger source DTIMer are:
INTernal - the digitizer’s internal 20 MHz oscillator (default source)
CLK10 - the VXIbus system’s 10 MHz clock
ECLTrg0 - the VXI backplane ECLTrg0 trigger line
ECLTrg1 - the VXI backplane ECLTrg1 trigger line
EXTernal2 - the digitizer’s front panel "Ext 2" BNC port
When using any of these references, one of the two sample rates must be set
to the reference period. Also, the reference used must be specified with the
SENSe:ROSCillator:SOURce command, and if the source is ECLTrg0/1 or
EXTernal2, the frequency of the reference must be specified with the
SENSe:ROSCillator:EXTernal:FREQuency command.
4. Other Dual Rate Sampling Sources. When the dual rate sampling
source is DECLtrg, ECLTrg0 paces the pre-arm readings and ECLTrg1
paces the post-arm readings. The sample rates are determined entirely by
the source(s) driving the trigger lines. When the dual rate sampling source is
DEXTernal, front panel port "Ext 1" paces the pre-arm readings and port
"Ext 2" paces the post-arm readings. The sample rates are determined
entirely by the source(s) driving the ports.
5. Additional Information. More information on dual rate sampling is
found in Chapter 3 - "Understanding the Digitizer".
Using Multiple Digitizers
This program demonstrates:
• how to route the internal reference clock from one digitizer to a
second digitizer, and how to configure the digitizers such that they
are armed simultaneously.
56 Usin
g
the Di
g
itizer Chapter 2