Specifications

Section 7. Measurement Instructions
SDMX50 (SDMAddress, Channel)
SDMX50 allows individual multiplexer switches to be activated independently
of the TDR100 Instruction.
SDMX50 is useful for selecting a particular probe to troubleshoot or to
determine the apparent cable length.
Because it is usually easy to hear the multiplexer(s) switch, the SDMX50
instruction is a convenient method to test the addressing and wiring of a level
of multiplexers: Program the datalogger to scan every few seconds with the
SDM address for the multiplexer(s) and channel 8. The Instruction always
starts with channel 1 and switches through the channels to get to the
programmed channel. Switching to channel 8 will cause the most prolonged
noise.
Remember each multiplexer level has a different SDM Address. Level 1
multiplexers should be set to the address 1 greater than the TDR100, Level 2
multiplexers should be set to the address 2 greater than the TDR100 and Level
3 multiplexers should be set to the address 3 greater than the TDR100. If the
SDMX50 multiplexers for a given level are connected and have their addresses
set correctly they should all switch at the same time.
Parameter
& Data Type
Enter
SDMAddress
Constant
The SDMAddress of the SDMX50 to switch. Valid SDM addresses are 0
through 14.
Channel
Constant
The SDMX50 channel to switch to (1-8)
TDR100 (Dest, SDMAddress, Option, Mux/ProbeSelect, WaveAvg, Vp,
Points, CableLength, WindowLength, ProbeLength, ProbeOffset,
Mult, Offset)
This instruction can be used to measure one TDR probe connected to the
TDR100 directly or multiple TDR probes connected to one or more SDMX50
multiplexers.
Parameter
& Data Type
Enter
Dest
Variable or
Array
The Dest parameter is a variable or variable array in which to store the
results of the measurement. The variable must be dimensioned to
accommodate all of the values returned by the instruction, which is
determined by the Option parameter.
SDMAddress
Constant
The SDMAddress parameter defines the address of the TDR100 with which
to communicate. Valid SDM addresses are 0 through 14. Address 15 is
reserved for the SDMTrigger instruction. If the Reps parameter is greater
than 1, the datalogger will increment the SDM address for each subsequent
TDR100 that it communicates with.
Note: CRBasic dataloggers are programmed using the base 10 address (0-
14) Edlog programmed dataloggers (e.g., CR10X, CR23X) used base 4
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