Instek DAQ-903 – 40-Channel Single-Ended Multiplexer

Description
Instek DAQ-903 – 40-Channel Single-Ended Multiplexer
The Instek DAQ-903 can switch 40 single-wire inputs per module. It can be used for common-low applications such as battery testing, component characterization, and desktop testing. The low voltage connection is isolated from the ground and can be floated up to 300 V. DAQ-903 also supports all 2-wire internal measurements except current.
Please note: this item is only a module – mainframe is sold separately.
Several versions available
Instek offers several modules for use with its DAQ-9600 mainframe. The information below provides an overview of the main specifications for each. For more detailed information, please click here.
DAQ-900
20-Channel Universal Multiplexer (Solid State Relay)
Scanning speed up to 450 channels per second
2-wire and 4-wire scanning
Built-in temperature cold junction reference
120V switching
DAQ-901
20+2 Channels Universal Multiplexer (Armature Relay)
Scanning speed can reach 80 channels per second
2-wire and 4-wire scanning
Built-in temperature cold junction reference
300V switching
The extra 2 channels can directly measure current (1A/per CH)
DAQ-903
40-Channel Single-Ended Multiplexer
Scanning speed can reach 80 channels per second
Single-wire switching is suitable for common-low applications
Built-in temperature cold junction reference
DAQ-904
4 x 8 2-Wire Matrix
3ms switching speed
32 2-wire intersections
300V, 1A switching
Up to 96 crosspoints (3 slots)
DAQ-909
8+2 Channels High Voltage High Current Multiplexer
3ms switching speed
DC voltage 600V, current 2A
2-wire and 4-wire scanning
Additional 2 channels can directly measure current (2A/per channel)
Internal DMM measurement functions supported

DAQ-900 DAQ-901 DAQ-903 DAQ-904 DAQ-909
AC/DC Voltage ✓² ³ ✓ ✓
✓
AC/DC Current
✓

✓
Freq./Period ✓ ✓ ✓
✓
2-Wire Resistance ✓¹ ✓ ✓
✓
4-Wire Resistance ✓¹ ✓

✓
Thermocouple ✓ ✓

✓
2-Wire RTD
✓ ✓
✓
4-Wire RTD
✓

✓
Transistor
✓ ✓
✓
Capacitance
✓ ✓
✓

Note:
1. For the measurement of 100Ω and 1kΩ resistance ranges, it is recommended to use 4-wire resistance. The maximum resistance range of DAQ-900 is 1MΩ.
2. When measuring AC voltage, the input impedance will decrease with frequency. A source impedance of 5Ω or less will maintain specification over frequency. A source impedance of 50Ω or less will maintain specification in the 5 kHz range.
3. For DC voltage measurement, if the integration time is short and the source impedance is high, more stabilization time may be required.