A-3-1-1 T4 AIN General Specs [T-Series Datasheet] | LabJack
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A-3-1-1 T4 AIN General Specs [T-Series Datasheet]




This T4 section is under construction. Please check back later for correct information. In the meantime look at the U3 analog inputs specs which are almost identical to the T4.

Table A.3-1. T4 Analog Input Information.  Specifications at 25 degrees C and Vusb/Vext = 5.0V, except where noted.

Parameter Conditions Min Typical Max Units
Analog Inputs          
Typical Input Range (1) Single-Ended, LV 0   2.5 volts
  Single-Ended, HV -10.0   10.0 volts
Max AIN Voltage to GND (2) Valid Readings, LV -0.3   3.6 volts
  Valid Readings, HV -12.8   20.1 volts
Max AIN Voltage to GND (6) No Damage, FIO -10   10 volts
  No Damage, EIO -6   6 volts
  No Damage, HV -40   40 volts
Input Impedance (7) LV   40  
  HV   1.3  
Source Impedance (7) Long Settling Off, LV     10
  Long Settling On, LV     200
  Long Settling Off, HV     1
  Long Settling On, HV     1
Resolution All Ranges   12   bits
  Single-Ended, LV, 0-2.5   0.6   mV
  Single-Ended, HV, ±10   5.0   mV
Integral Linearity Error     ±0.05   % FS
Differential Linearity Error     ±1   counts
Absolute Accuracy (8) Single-Ended %   ±0.13   % FS
  Single-Ended LV volts   ±3.2   mV
  Single-Ended HV volts   ±26.8   mV
  Differential %   ±0.25   % FS
  Differential LV volts   ±6.4   mV
  Differential HV volts   N/A    
Temperature Drift     15   ppm/°C
Noise (Peak-To-Peak) (9) Quick Sample Off   ±1   counts
  Quick Sample On   ±2   counts
Effective Resolution (RMS) (10) Quick Sample Off   >12   bits
Noise-Free Resolution (9) Quick Sample Off   11   bits
Command/Response Speed See Section 3.1        
Stream Performance See Section 3.2        
* LV specs refer to low voltage analog inputs which are available on the T4 analog lines AIN4 - AIN11.  HV specs refer to high voltage analog inputs which are available on analog lines AIN0 - AIN3 only.
(1) Note that these are typical input ranges.  The actual minimum on the low voltage inputs might not go all the way to 0.0 as discussed in Section  These are with DAC1 disabled on hardware version < 1.30.
(2) This is the maximum voltage on any AIN pin compared to ground for valid measurements.
(6) Maximum voltage, compared to ground, to avoid damage to the device. Protection level is the same whether the device is powered or not.     
(7) The low-voltage analog inputs essentially connect directly to a SAR ADC on the U3, presenting a capacitive load to the signal source. The high-voltage inputs connect first to a resistive level-shifter/divider. The key specification in both cases is the maximum source impedance. As long as the source impedance is not over this value, there will be no substantial errors due to impedance problems.     
(8) Absolute error includes INL, DNL, and all other sources of internal error at 25 C and VS=5.0V. To equate the percentage to voltage, multiply the full voltage span by the percentage.  For a single-ended low voltage input using the normal range the span is about 2.4 volts, so 2.4 * 0.0013 gives ±0.003 volts. For a single-ended high voltage input using the normal range the span is about 20 volts, so 20 * 0.0013 gives ±0.026 volts. Differential readings are not calibrated on high voltage channels.
(9) Measurements taken with AIN connected to a 2.048 reference (REF191 from Analog Devices) or GND. All "counts" data are aligned as 12-bit values. Noise-free data is determined by taking 128 readings and subtracting the minimum value from the maximum value.     
(10) Effective (RMS) data is determined from the standard deviation of 128 readings. In other words, this data represents _most_ readings, whereas noise-free data represents all readings.     

See also: Appendix A-3-1 Noise and Resolution