Campbell Scientific CR3000 Micrologger - Manual (Page 335)

Section 8. Operation
335
8.2.5 Analog Control / Output Devices
The CR3000 can scale measured or processed values and transfer these values in
digital form to either its on-board CAO ports or to an analog output device. The
analog output device performs a digital-to-analog conversion to output an analog
voltage or current. The output level is maintained until updated by the CR3000.
Refer to the appendix Continuous Analog Output (CAO) Modules
(p. 565)
for
information concerning available continuous analog output modules.
8.2.6 TIMs
Terminal Input Modules (TIMs) are devices that provide simple measurement-
support circuits in a convenient package. TIMs include voltage dividers for
cutting the output voltage of sensors to voltage levels compatible with the
CR3000, modules for completion of resistive bridges, and shunt modules for
measurement of analog-current sensors. Refer to the appendix Signal
Conditioners
(p. 563)
for information concerning available TIM modules.
8.2.7 Vibrating Wire
Vibrating wire modules interface vibrating-wire transducers to the CR3000. Refer
to the appendix Pulse / Frequency Input-Expansion Modules
(p. 562)
for information
concerning available vibration-wire interface modules.
8.2.8 Low-level ac
Low-level ac input modules increase the number of low-level ac signals a
CR3000 can monitor by converting low-level ac to high-frequency pulse. Refer to
the appendix Pulse / Frequency Input-Expansion Modules
(p. 562)
for information
concerning available pulse-input modules.
8.3 Memory and Final Data Storage
8.3.1 Storage Media
CR3000 memory consists of four non-volatile storage media:
• Internal battery-backed SRAM
• Internal flash
• Internal serial flash
• External flash (optional flash USB: drive)
• External CompactFlash
® optional CF card and module (CRD: drive)
Table CR3000 Memory Allocation
(p. 336)
and table CR3000 SRAM Memory
(p. 337)
illustrate the structure of CR3000 memory around these media. The CR3000
utilizes and maintains most memory features automatically. However, users
should periodically review areas of memory wherein data files, CRBasic program
files, and image files reside. Review and management of memory are
accomplished with commands in the datalogger support software
(p. 76)
File
Control
(p. 456)
menu.