USB DAQ with 16 Analog inputs SE or 8 differentials, Analog outputs 2E/S Digital: 16. Counters/Timers: 2 channels, 16-bits Frequency: 100 KHz. Galvanic isolation ± 500V. Up to 100 kS/s. Configurable gain of 1, 2, 4 and 8. Ranges of ± 1.25V, ± 2.5V, ± 5V and ± 10V. The DT9800 Series is a family of low-cost, isolated, multifunction USB data acquisition modules. All DT9800 Series modules feature 16 single-ended (SE)/8 differential (DIFF) inputs with 12- or 16-bit resolution, up to 100 kS/s aggregate sample rate, 16 digital I/O lines, 2 counter/ timers, and optional 12- or 16-bit analog outputs.
Analog Inputs
All DT9800 Series modules support 16 single-ended or pseudo-differential analog input channels or eight differential analog input channels. Software selectable gain settings of 1,2,4, and 8 provide effective input ranges of ±1.25 V, ±2.5 V, ±5 V, and ±10 V. On the DT9801 and DT9801, you can specify a unipolar range of 0 – 10 V.
±500 V Isolation Protects Your Data
Computers are susceptible to ground-spikes through any external port. These spikes can cause system crashes and may even cause permanent damage to the computer. The DT9800 Series modules feature 500 Volts of galvanic isolation to protect the computer from ground-spikes and to ensure a reliable stream of data.
Flexible Acquisition Modes Using The Input Channel-Gain List The DT9800 Series module can acquire data from one or more analog input channels using an input channel-gain list. A 32-location channel-gain list allows great flexibility in configuring channels, sample rates, and gains. For example, it permits sampling non-sequential analog input channels, analog input channels with different gains, and digital inputs at the A/D sample rate.
For each entry in the input channel-gain list, specify the channel to sample and the gain to apply to that channel. Channels in an input channel-gain list are sampled in order from the first entry to the last entry in the list. Channel numbering is zero-based; that is, the first entry in the input channel-gain list is entry 0, the second entry is entry 1, and so on.
The DT9800 Series modules provide two ways to cycle through the channel-gain list:
- Continuous scan mode — Choose this mode to accurately control the period between conversions of individual channels in the channel-gain list.
- Triggered scan mode — Choose this mode to accurately control both the period between conversions of individual channels in the channelgain list and the period between each scan. This mode emulates a sample-and-hold function and is useful when synchronizing or controlling external equipment, or when acquiring a buffer of data on each trigger or retrigger.
Triggers A trigger is an event that occurs based on a specified set of conditions. The DT9800 Series module supports the following trigger sources:
- Software trigger — A software trigger event occurs when you start the analog input operation (the computer issues a write to the module to begin conversions). Using software, specify the trigger source as a software trigger.
- External trigger — An external digital trigger event occurs when the DT9800 Series module detects a rising edge on the Ext A/D Trigger input signal connector. The trigger signal is TTL-compatible. Using software, specify the trigger source as an external, positive, digital (TTL) trigger.
Analog Output Channels The DT9802 and DT9804 modules support two DC-level analog output channels (DAC0 and DAC1). Within each DAC, the digital data is double-buffered to prevent spurious outputs, then output as an analog signal. Both DACs power up to a value of 0 V ±10 mV. Resetting the module does not clear the values in the DACs. The DT9800 Series modules can perform single-value analog output operations only. Use software to specify the range, gain, and analog output channel, and then output the data from the specified channel. You cannot specify a clock source, trigger source, or buffer. Note: You cannot perform a single-value analog output operation while the A/D subsystem is running. The settling time for each DAC is 50 µs (20 V steps). Single-value operations stop automatically when finished; you cannot stop a singlevalue operation.
Digital I/O All DT9800 Series modules feature 16 digital I/O lines. These lines are divided into the following 8-bit ports: Port A, input and Port B, output. You can also read the status of Port A at rates as high as the maximum speed of the A/D by including the digital input lines of Port A as a channel in the analog channel-gain list. This dynamic digital input feature allows you to “time stamp” the digital inputs in relation to the analog inputs. In this mode, all 8 digital input lines of Port A are read as one word.
The digital outputs have sufficient current capability to drive external solid-state relay modules (sink 12 mA and source 1 mA). If you apply +5 V to the +5 V outputs, the digital outputs maintain their previous state if the computer goes down or if the USB cable is unplugged. On enumeration, the module senses +5 V and does not reset the digital outputs.
User Counter/Timers Two 16-bit counter/timers are supported by all DT9800 Series modules. The counters are numbered 0 and 1. Each counter accepts a clock input signal and gate input signal and outputs a clock output signal (also called a pulse output signal). DT9800 Series modules support the following counter/timer operation modes: Event counting, Frequency measurement, Rate generation, One-shot, and Repetitive one-shot. You can cascade two counters internally through software or cascade more than two counters externally on the user connections. You can also set the duty cycle, frequency, and output polarity of the output pulse from the user counter/ timers.
USB 2.0 Compatibility The DT9800 Series modules are fully compatible with USB 2.0 and USB 1.1. USB 2.0 extends the speed of connection to up to 480 Mbps. For optimal performance, it is recommended that you use the modules with a USB 2.0 port. The DT9800 Series can be used with a USB 1.1 port, but at USB 1.1 performance. The DT9800 Series modules are USB powered – no external power supply needed. Features:
- ±500 V galvanic isolation prevents ground loops, maximizes analog signal integrity, and protects the computer
- Runs on USB power ideal for portable applications – no external power supply needed
- 16 SE/8 DIFF analog input channels, 12- or 16-bit resolution
- Fast sampling: up to 100 kS/s sample rate
- Analog output channels: optional 12- or 16-bit
- 16 DIO, two 16-bit counter/timers
- Flexible acquisition modes for input operations: single value, continuous, and triggered scan
- Includes free QuickDAQ software to get up and running quickly.
- Supported Operating Systems: Windows® 10/8/7/Vista®/XP 32/64-bit
