Campbell CDM-VW300 Series Manuel télécharger pdf (Page 20)

CDM-VW300 Series Dynamic Vibrating-Wire Analyzers

Operating temperature

Standard:

–25° to 50°C

Extended:

–55° to 85°C

Power requirement

Voltage:

9.6 to 32 Vdc

Typical current drain

CDM-VW300:

115 mA @ 12 Vdc

CDM-VW305:

190 mA @ 12 Vdc

Output

CPI:

Connects to datalogger. Baud rate

selectable from 50 kbps to 1 Mbps.

Cable length varies depending on

baud rate, number of nodes, cable

quality, and noise environment.

2500 ft maximum.

USB:

Connects to PC. USB 2.0 full speed.

Provided for configuration, updates,

and communication with DVWTool

software. The USB port does not

support collection of time-series

data.

Weight:

< 1 kg, < 2 lb

Dimensions:

20.3 x 12.7 x 5.1 cm (8 x 5 x 2 in)

Mounting:

One-inch grid. Optional DIN rail

mounting is available using

Campbell Scientific pn 29388.

SC-CPI module connects to terminals C1, C2, C3 (not SDM-C1, SDM-C2, SDM-C3).

CR3000 is the recommended datalogger.

These rates available only on PC with fast processor using USB cable in lab mode.

The effective resolution (precision) of the output is limited by noise and varies with the sample

rate.

Typical values for a 2.5 kHz resonant sensor.

Thermistor accuracy and resistance of the wire should be considered as additional errors.

6. Installation

The CDM-VW300 system is designed for use with a PC or as part of a field

data-acquisition system using a Campbell Scientific CR3000 datalogger.

When sensors are sampled at slower rates equal to or less than 50 Hz, a

CR1000 or CR800 datalogger can be used.

Pre-configure and test the system before taking it to the field. Issues that are

unresolved before placing instrumentation in the field will usually be more

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Campbell CDM-VW300 Series Manuel Page 20

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