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Details
Details
The LJTick-InBuff (LJTIB) is an input buffer tick that allows LabJack devices to directly measure pH sensors and other kinds of weak signals. Our main LabJack DAQ products (U3, U6, UE9, and T7) require somewhere on the order of 10 to 100pA of bias current. This accessory can really help users trying to measure signals with >10MΩ of source impedance. The LJTick-InBuff accomplishes this by adding a Texas Instruments OPA2140 high-precision, low-noise Op Amp inbetween a devices analog input channel and the sensor. Simply connect the LJTick-InBuff to a screw terminal with analog inputs and connect a sensor to the INA or INB screw terminal of the LJTick-InBuff.
- Only requires 1pA bias current
- ±10V input range
- Has pads to optionally install gain resistors
Common Applications
- Measuring PH sensors.
 Figure 1: LJTick-InBuff |
 Figure 2: LJTick-InBuff with U3-LV |
Screw Terminal Descriptions
VS: This is the same 5 volt output as the VS terminals on the LabJack itself. This is an output terminal, not an input. It can be used to provide 5 volt (nominal) power as needed.
GND: Same as LabJack ground (GND).
INA/INB: These input lines go through the Op Amps to have their signals amplified before being sent to a LabJack device..
LJTick-InBuff Schematic
Figure 3: LJTick-InBuff Schematic
Specifications
Product Comparison |
|||||||||
| U12 | U3-LV | U3-HV | U6 | U6-Pro | UE9 | UE9-Pro | T7 | T7-Pro | |
| AIN Voltage | ±10V | 0-2.4V | ±10V [1] | ±10V | ±10V | ±5V | ±5V | ±10V | ±10V |
| Analog Inputs | 8 | 16 | 16 | 14 | 14 | 14 | 14 | 14 | 14 |
| Effective Resolution [2] | 12 bit | 12 bit | 12 bit | 16 bit | 22 bit | 12 bit | 20 bit | 16 bit | 22 bit |
| Digital I/O | 20 | 20 | 16 | 20 | 20 | 23 | 23 | 23 | 23 |
| Logic Level | 5V | 3.3V | 3.3V | 3.3V | 3.3V | 3.3V | 3.3V | 3.3V | 3.3V |
| Analog Outputs | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Counters | 1 | Up to 2 | Up to 2 | Up to 2 | Up to 2 | Up to 2 | Up to 2 | Up to 10 | Up to 10 |
| USB | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| LJTick Compatible | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Internal Temp Sensor | No | Yes | Yes | Yes | Yes | Yes |
Yes |
Yes | Yes |
| Thermocouple Ready [3] | No | No | No | Yes | Yes | No | Yes | Yes | Yes |
| Ethernet | No | No | No | No | No | Yes | Yes | Yes | Yes |
| Scripting | No | No | No | No | No | No | No | Yes | Yes |
| Wireless | No | No | No | No | No | No | No | No | Yes |
| Real-time Clock | No | No | No | No | No | No | No | No | Yes |
[1] Can be configured for -10V to +20V range.
[2] According to actual measured data, see related Noise and Resolution (App Note)
[3] If not thermocouple ready, can purchase an amplifier like the LJTick-InAmp, see related Thermocouples (App Note)
[2] According to actual measured data, see related Noise and Resolution (App Note)
[3] If not thermocouple ready, can purchase an amplifier like the LJTick-InAmp, see related Thermocouples (App Note)