Interfaces directly to a PC for quick setup and data acquisition
概览
The Granite™ Volt 108 easily expands the channel count on your data-acquisition system. It has eight differential or 16 single-ended input channels, as well as two excitation channels. The Volt 108 provides programmable, precision excitation for standard sensor measurements and power outputs for controlling sensors and peripherals. This module features a 24-bit, analog-to-digital converter with low-noise performance for superior analog measurements.
优势与特点
- 24-bit ADC and low-noise inputs for increased measurement quality
- Distributed data acquisition
- Channel count expansion via the CPI bus on Campbell Scientific data loggers
- Easier to program than traditional multiplexers
- Programmable noise rejection
- CANbus 2.0 A/B output available with the Extended Duty (-XD) version
- USB 2.0 interface for PC-based operation with Campbell Scientific Surveyor software
图像
3D/CAD 文件：
产品规格
| Power Requirements | 9.6 to 32 Vdc voltage |
| Mounting | Standard 1-in. grid (DIN rail mounting available) |
| Accuracy |
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| Number of Channels | 8 differential or 16 single-ended |
| Operating Temperature Range |
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| Maximum Scan Rate |
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| Input Range | ±5000 mV, ±1000 mV, and ±200 mV |
| Period Averaging | Traditional period averaging on analog input channels |
| CPI | For data logger connection. Baud rate selectable from 50 kbps to 1 Mbps. (Allowable cable length varies depending on baud rate, number of nodes, cable quality, and noise environment, but can be as long as 700 m under proper conditions.) |
| USB | USB 2.0 full speed connection available for attaching to a PC. (Port is used to configure the module and download updates via our Device Configuration Utility.) |
| Warranty | One year against defects in materials and workmanship |
| Dimensions | 20.3 x 12.7 x 5.1 cm (8 x 5 x 2 in.) |
| Weight | 0.8 kg (1.75 lb) |
Typical Current Drain |
|
| Sleep | <1 mA |
| Active 1 Hz Scan |
2 mA (estimated) Assumes one single-ended measurement with the first notch frequency (fN1) at 30 kHz Note: Any sensor excitation or switched power loads will be additive to this value. |
| Active 20 Hz Scan |
20 mA Assumes one single-ended measurement with the first notch frequency (fN1) at 30 kHz Note: Any sensor excitation or switched power loads will be additive to this value. |
| Active 1 kHz Scan |
67 mA Note: Any sensor excitation or switched power loads will be additive to this value. |
Voltage/Current Excitation Outputs |
|
| Voltage Excitation | ±5 V (@ 50 mA) |
| Current Excitation | ±2.5 mA (±5 V compliance voltage) |
| Number of Voltage/Current Excitation Outputs | 2 |
General Purpose Outputs |
|
| Number of SW5V Outputs | 2 |
| SW5V Output Resistance | 30 Ω |
| Number of SW12V Outputs | 1 |
| Typical Limit of SW12V Outputs | 200 mA |
| Minimum Limit of SW12V Outputs | 180 mA |
| Number of 12V Outputs | 1 |
| Typical Limit of 12V Outputs | 200 mA |
| Minimum Limit of 12V Outputs | 180 mA |
兼容性
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
数据采集器
| Product | Compatible | Note |
|---|---|---|
| CR1000X | Requires OS version 4 or greater. | |
| CR6 | Requires OS version 10 or greater. |
Distributed Data Acquisition
| Product | Compatible | Note |
|---|---|---|
| Granite 10 | Requires OS version 1 or greater. | |
| Granite 6 | Requires OS version 1 or greater. | |
| Granite 9 | Requires OS version 1 or greater. |
Additional Compatibility Information
The Volt 108 is compatible with CPI-enabled data loggers only.
下载
CPI Calculator v.1.0 (2.49 MB) 06-07-2016
The CPI Calculator is a downloadable Microsoft Excel spreadsheet used to estimate the usage and capacity of a CPI network. The calculator provides an overview on CPI devices including the CDM-A108, CDM-A116, CDM-VW300, CDM-VW305, and the CSAT3B. The calculator can also estimate the measurement speed of the CDM-A108 and CDM-A116 based on the number of channels and measurement parameters.
The CPI Calculator is an estimation tool and will help you better understand and design CPI networks by considering the following:
- What is the capability of each CDM or CPI device
- What is the CPI network capacity
- How much of the CPI capacity are the CDMs or CPI devices using
常见问题解答
Granite Volt 108: 8
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The Volt 108/116 XD and Temp 120 XD output CAN2.0b data frames in Big Endian byte format.
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Only the XD versions (not the SD) support CANOut 2.0b. To enable this function, use our SURVEYOR software. When SURVEYOR recognizes an XD module, a CAN Enable menu appears with a “CAN Enabled” slider switch.
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In the Burst Mode operation, repeated measurements are performed on the same channel for X number of times. Then there is a waiting period for the measurements to be processed and transmitted to the data logger. No measurements can be made during this processing period. The maximum capture rate is 30 kHz on a single channel for a duration of 2.18 seconds (absolute maximum capability).
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All outputs except strain gauge calculated microstrain are supported in CANOut:
- Volt SE/Diff output in mV
- BridgeFull in mv/V
- BrHalf3W and BrHalf4W in Rs/Rf
- Temp 120 output in desired temperature units
Note: Strain values are in mV/V and either need a data logger or post processing to calculate microstrain.
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Yes, both 11-bit and the 29-bit (extended) message identifiers are supported.
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If a CPI-enabled device is running and there are skipped scans in the data logger, what can be done?
The default CPI bus speed setting is 250 kB/s. The speed is adjustable in your CRBasic data logger program. Use the CPISpeed() instruction in your CRBasic program to adjust the CPI bus bandwidth to meet the following maximum combined (total) Ethernet cable lengths:
- 1000 kB/s for maximum combined Ethernet cable lengths of 15.2 m (50.0 ft)
- 500 kB/s for maximum combined Ethernet cable lengths of 61.0 m (200.0 ft)
- 250 kB/s for maximum combined Ethernet cable lengths of 152.4 m (500.0 ft)
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In continuous scan mode (normal operation), 1 kHz on 1 channel is typical.
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Yes, a specific CAN ID can be selected for each module.