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Voltage reference accessory that outputs a stable 2.5V. Commonly used as an excitation voltage for various circuits. The IOA and IOB lines are pass-through terminals, and do not interact with the accessory in any way.

  • Voltage: 2.5V

  • Accuracy: ±0.08%, ±2mV

  • Maximum load: 50mA

  • Short circuit current: 100mA

  • Temperature coefficient: 5ppm/°C



The LJTick-VRef-25 (LJTVR-25) is tick that provides screw terminal access to a stable 2.5V reference voltage. Teference voltages are useful when trying to communicate with several different sensors ranging from temperature, pressure, flow, motion, vibration, force, and more. The VS line on most of our devices is not suitable for direct control of sensors that require noise free voltage sources. With out a stable reference voltages many applications need to use a digital I/O line, one of the analog output channels, or use a secondary power supply. The LJTVR-25 and LJTVR-41 both have a LJT1461A voltage regulator on board to supply 50mA of current to sensors requiring excitation signals. The LJTick-VRef-25 outputs 2.5V and the LJTick-VRef-41 outputs 4.096V.

Common Applications

  • When ever a regulated 2.5V signal is needed.
LJTick-VRef-25 USB, Ethernet, WiFi Data Acquisition (DAQ) Device voltage Regulation Accessory

Figure 1: LJTick-VRef-25

LJTick-VRef-25 with U3-LV USB Data Acquisition (DAQ) and Control Device

Figure 2: LJTick-VRef-25 with U3-LV

Screw Terminal Descriptions

2.500: This screw terminal outputs the 2.5V reference voltage.

GND: Same as LabJack ground.

IOA/IOB: These lines are directly passed through from the screw terminals they are connected to. In Figure 2 they are FIO0 and FIO1.

LJTick-VRef-25 Schematic

LJTick-VRef-25 Schematic

Figure 3: LJTick-VRef-25 Schematic


  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
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)