Measurement Applications of the DAQ-9600
Creating a Dedicated Multi-Point Current Measurement Module
The DAQ-9600 data acquisition system offers seven modules for implementing multi-channel measurement.
Among them, the DAQ-901 and DAQ-909 modules each provide two channels capable of directly measuring current.
| Module description | Type |
Speed (ch/sec) |
Max volts |
Max amps |
Bandwidth |
Thermal offset |
Comment |
|
DAQ-900 20 ch Multiplexer |
2-wire solid-state (4-wire selectable) |
450 | 120 V | 10 MHz | < 4 μV | Built-in cold junction reference | |
|
DAQ-901 20 ch Multiplexer + 2 ch current |
2-wire armature (4-wire selectable) |
80 | 300 V | 1 A | 10 MHz | < 4 μV |
Bulit-in cold junction reference 2 additional current channels (22 total) |
|
DAQ-903 40 ch Single-Ended Mux |
1-wire armature (common low) |
80 | 300 V | 10 MHz | < 1 μV | No four-wire measurements | |
|
DAQ-904 4 x 8 Matrix |
2-wire armature | 300 V | 10 MHz | < 1 μV | |||
|
DAQ-907 Multifunction Module |
16 bit of digital input and output |
42 V | Open drain | ||||
| 100 kHz totllizer input | 42 V | 100 kHz | Input threshold selectable | ||||
| Two 18-bit analog outputs | ±12 V | ±24 mA | Max 40 mA total output per frame | ||||
|
DAQ-908 20 ch Actuator / General Purpose Switch |
SPDT / from C | 300 V | 10 MHz | < 4 μV | |||
|
DAQ-909 8 ch HV Multiplexer + 2 ch current |
2-wire armature (4-wire selectable) |
60 |
DC 600 V AC 400 V |
2 A | 10 MHz | < 4 μV |
High voltage / high current channels 2 additional current channels (10 total) |
When multiple current measurement points are required, a common approach is to connect a shunt in series and measure the voltage across them (converting current to voltage).
However, measurement discrepancies often occur due to variations in the tightness of the connections between the shunt and the measurement channels. The DAQ-909 (8-channel high-voltage + 2-channel high-current multiplexer) includes designated solder pads on the module for mounting shunt resistors.
By soldering the shunts directly onto the pads, measurement errors caused by loose screw connections can be eliminated. As a result, this module effectively becomes a dedicated current measurement module.
 |
Note: Recommended shunt values
1 Ω : For milliampere (mA) current measurements
0.1 Ω: For ampere (A) current measurements (up to 2 A)
When using the DAQ-Data Logger software, set the function to DCV, and use the MX+B conversion feature to convert the measured voltage into current (A).
(Settings)
(Results)
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Good Will Instrument Co., Ltd
No. 7-1, Jhongsing Road, Tucheng Dist.,
New Taipei City 23678, Taiwan R.O.C.
Email: marketing@goodwill.com.tw