Campbell CR9000, Инструкция по эксплуатации

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Section 7. Measurement Instructions
7-20
Parameter
& Data Type Enter INT8 INSTRUCTION PARAMETERS
-nnnn Instructs the INT8 to capture all events until " nnnn " edges have occurred on
channel 1, or until the logger addresses the INT8 with the CaptureTrig argument
true, or until 8000 (storage space limitation) events have been captured. When
the CaptureTrig argument is true, the INT8 will return up to the last
nnnn events
for each of the programmed INT8 channels, reset its memory and begin capturing
the next
nnnn events. The Dest array must be dimensioned large enough to
receive the captured events.
-9999 Causes the INT8 to perform a self memory test. The signature of the INT8's
PROM is returned to the datalogger.
RESULT CODE DEFINITION
0 Bad ROM
-0 Bad ROM, & bad RAM
Positive integer ROM signature, good RAM
Negative integer ROM signature, bad RAM
CaptureTrig
Constant,
Variable, or
Expression
This argument is used when the "Capture All Events" output option is used. When
CaptureTrig is true, the INT8 will return the last
nnnn events.
Mult, Offset
Constant,
Variable,
Array, or
Expression
A multiplier and offset by which to scale the raw results of the measurement. See the measurement
description for the units of the raw result; a multiplier of one and an offset of 0 are necessary to output in
the raw units. For example, the
TCDiff instruction measures a thermocouple and outputs temperature in
degrees C. A multiplier of 1.8 and an offset of 32 will convert the temperature to degrees F.
SDMSpeed (SDMSpeed)
Changes the rate that the CR9000 uses to clock the SDM data. Slowing down
the clock rate may be necessary when long cables lengths are used to connect
the CR9000 and SDM devices.
Parameter
& Data Type
Enter
SDMSPEED INSTRUCTION PARAMETER
SDMSpeed
Constant or
variable
Valid parameters range from 1 to 255 where 1 is the fastest (default) and 255 is the longest
period. The default bit period is approximately 2 microseconds. The time per bit, in
microseconds, is: BitPeriod = 2 * SD 5.
SDMTrigger
When SDMTrigger is executed, the CR9000 sends a "measure now" group
trigger to all connected SDM devices. SDM stands for Synchronous Device
for Measurement. SDM devices make measurements independently and send
the results back to the datalogger serially. The SDMTrigger instruction allows
the CR9000 to synchronize when the measurements are made. Subsequent
Instructions communicate with the SDM devices to collect the measurement
results. Not all SDM devices support the group trigger; check the manual on
the device for more information.