Section 8. Operation
315
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 CR800,
modules for completion of resistive bridges, and shunt modules for measurement
of analog-current sensors. Refer to the appendix Signal Conditioners
(p. 539) for
information concerning available TIM modules.
8.2.7 Vibrating Wire
Vibrating wire modules interface vibrating-wire transducers to the CR800. Refer
to the appendix Pulse / Frequency Input-Expansion Modules
(p. 538) 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 CR800
can monitor by converting low-level ac to high-frequency pulse. Refer to the
appendix Pulse / Frequency Input-Expansion Modules
(p. 538) for information
concerning available pulse-input modules.
8.3 Memory and Final Data Storage
8.3.1 Storage Media
CR800 memory consists of four non-volatile storage media:
• Internal battery-backed SRAM
• Internal flash
• Internal serial flash
• External flash (optional flash USB: drive)
•
Table CR800 Memory Allocation (p. 316) and table CR800 SRAM Memory (p. 317)
illustrate the structure of CR800 memory around these media. The CR800 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. 431) menu.
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