Spectrum

Name: Spectrum
Brand: Campbell Scientific
SKU: Spectrum
Availability: InStock

Spectral Analysis and High-Speed Analog Input Module

Spectrum

Orderable

Spectral Analysis and High-Speed Analog Input Module

Pricing

Configuration

3-ChannelSpectrum-103Part Number: 34877
9-ChannelSpectrum-109Part Number: 34879

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Model:: Spectrum
Item Number:: Spectrum
Warranty:: 1 year

Overview

The Spectrum Spectral Analysis and High-Speed Input Module—available in three-channel or nine-channel variants—offers high-speed synchronous sampling for analog inputs, with dedicated analog input hardware that includes amplifiers, filters, and analog-to-digital converters (ADC).

Key Advantages

Maximize Your
High-Speed Dynamic Applications
Designed for analog measurements

Technical Description

The Spectrum 103 (three channels) and 109 (nine channels) share the same design, offering a variety of selectable input ranges on each channel.

Synchronization

Synchronization is achieved when all channels are sampled in coordination, based on a shared clock or timing signal.

Each channel is digitized using a 32-bit ADC and offer channel-to-channel sampling synchronization within approximately ±10 ns.

When using the EPI bus to synchronize across multiple modules, module-to-module synchronization is achieved within approximately ±100 ns.

Simultaneous

To achieve simultaneous measurements, where each channel is sampled at exactly the same time, each channel has its own dedicated ADC and processor. All channels begin their measurements at the same time and record over the same time interval—ensuring true time alignment across the board. Special hardware and processing is used to eliminate signal propagation delays and clock drift between modules.

Sample Rate

The Spectrum is capable of sustained high-speed measurements—up to 10,000 Hz per channel continuously. This is faster than any of our other products and allows for detailed insight into fast-changing signals.

When programming, select an anti-aliasing filter for sample rates up to 10 kHz and bandwidths up to 5 kHz.

Three-Axis

Each Spectrum channel offers selectable input ranges: ±200 mV, ±1 V, ±5 V, and ±10 V. The Spectrum 103 and 109, providing three or nine input channels respectively, make them ideal for three-axis accelerometers and strain gages.

Connection via EPI and CPI

Spectrum modules connect to data loggers via EPI or CPI networks using standard Ethernet cables (CAT5e, CAT6, or higher). EPI networks are ideal for Spectrum applications. For smaller channel count setups, a single Spectrum is connected to a traditional CPI-enabled data logger, such as the CR6.

Basic Programming

Short Cut software streamlines basic program creation for reading multiple Spectrum modules. It generates a wiring diagram and a CRBasic program for your data logger. For advanced processing or data management, you can further customize the CRBasic program.

Benefits

Synchronization across multiple modules
Simultaneous measurement across all channels
Sustained high-speed measurements up to 10 kHz
Ideal for three-axis accelerometers and strain gages
Connection to data logger via EPI and CPI
Streamlined creation of basic programs

Specifications

Operating Temperature Range: -40° to +70°C
Storage Temperature: -55° to +85°C
IP Rating: IP20
Humidity: 0 to 99%
(non-condensing)
Number of Channels: Three differential
(Spectrum 103)
Nine differential
(Spectrum 109)
Input Range: ±10000 mV, ±5000 mV, ±1000 mV, and ±200 mV
Common-Mode Input Voltage: ±15 Vdc
Absolute Maximum Input Voltage: ±16 Vdc
A/D Converters: 32-bit SAR ADCs
Measurement Accuracy @ 20°C: ±(0.04% of reading ±130 μV)

Note: The accuracy specification does not include sensor error or measurement noise.
Input Resistance: 80 MΩ
Input Time Constant: 230 ns
Input Offset Current: 5 nA typical, maximum @ 50°C
Processor: Digital signal processor 32-bit with floating point units
Processor Speed: 400 MHz
Memory: 128 MB SRAM
Power Requirements: 10 to 30 Vdc voltage
Dimensions: 21.6 x 13.7 x 7.6 cm (8.5 x 5.4 x 3.0 in.); additional clearance required for cables and wires
Weight: 1.6 kg
(3.53 lb)