5 analog input channels (expandable to 100*)
Each channel is independent and supports: one isolated 3-wire or 4-wire input, or two isolated 2-wire inputs, or three common referenced 2-wire inputs.
The following maximums apply.
Two wire with common reference terminal: 15 (expandable to 300*)
Two wire isolated: 10 (expandable to 200*)
Three and four wire isolated: 5 (expandable to 100*)
*Expansion requires optional CEM20 Fundamental Input Ranges
The fundamental inputs that the DT80 can measure are voltage, current, resistance and frequency. All other measurements are derived from these.
Integrates over 50/60Hz line period for accuracy and noise rejection
Maximum sample speed: 25Hz
Effective resolution: 18 bits
Common mode rejection: >90dB
Line series mode rejection: >35dB
Inter-Channel Isolation: 100V (relay switching)
Analog Section Isolation: 100V (opto-isolated)
Input impedance: 100KΩ, >100MΩ
Common mode range: ・}3.5V or ・}35V on 30V range Sensor Excitation (Supply)
selectable 250μA or 2.5mA precision current source, 4.5V voltage source, or switched external supply
General Purpose: Switchable 12V regulated supply for powering sensors & accessories (max 150mA)
Switchable 5V regulated supply for powering analog sensors (max 25mA)
Supports a wide range of sensors including, but not limited to, those listed below.
A wide range of sensor scaling and linearising facilities including polynomials, expressions and functions.
B, C, D, E, G, J, K, N, R, S, T
Calibration standard: ITS-90
Materials supported: Pt, Ni, Cu
Resistance range: 10Ω to 10KΩ
YSI 400xx Series, other types*
Resistance range: <10kΩ**
* Other thermistor types are supported by thermistor scaling and calculated channels.
**Resistance range can be increased with the use of a parallel resistor.
Monolithic Temperature Sensors Types supported:
LM34 - 60, AD590, 592, TMPxx, LM135, 235, 335
Strain Gauge and Bridge Sensors Configurations:
. , . & full bridge Excitation: voltage or current
Current Loop Internal 100Ω shunt or external shunt resistor
8 bi-directional channels
Input Type: 8 logic level (max 20/30V)
Output Type: 4 with open drain FET(max: 30V, 100mA), 4 with logic output.
Relay Output 1 latching relay, contacts (max: 30Vdc, 1A)
Low Speed Counters 8 counters shared with digital inputs.
Low speed counters do not function in sleep mode.
Size: 32 bit
Max Count rate: 10 Hz
Dedicated Counter Inputs 4 high speed or 2 phase encoder (quadrature) inputs
Size: 32 bit
Max Count rate: 100 kHz
Input type: 2 logic level inputs (max ・}30V), 2 sensitive inputs (10mV) for magnetic pick-ups (max ・}10V)
4 SDI-12 inputs, shared with digital channels.
Each input can support multiple SDI-12 sensors.
Generic Serial Sensor
Flexible options to allow data to be logged from a wide range of smart sensors and data streams.
Available ports: Serial Sensor Port (RS232, RS422, RS485) or Host RS232 Port*
Baud rate: 300 to 115,200
*If used as a Serial Sensor channel then the Host Port is not available for other communications.
Calculated Channels Combine values from analog, digital and serial sensors using expressions involving variables and functions.
Functions: An extensive range of Arithmetic, Trigonometric, Relational, Logical and Statistical functions are available.