Specifications are subject to change without notice.
7.a-4 Specifications
978090
IOtech 652u & 655u User’s Manual
Calibration Notes
Factory calibration of 652u and 655u was conducted with the units in their standard operating upright horizontal
position, with the chassis cover clear of other devices and objects.
For 655u thermocouple calibration, 5-22 AWG wires were used.
Additional notes pertaining to the 655u and temperature readings.
•
To meet the accuracy specifications, the temperature connector plastic shell must be installed. Installation
instructions are provided on page 3-6.
•
Following a drastic (rapid) change in ambient temperature (of the 655u’s environment) allow the unit to
stabilize to the new ambient before taking temperature readings. If the unit has not stabilized, temperature
readings may not meet published specifications.
•
A gradual change in ambient temperature (to the 655u’s environment) will not result in any significant
measurement error.
•
Different gauge sizes and the total number of thermocouples used will affect the accuracy of the temperature
readings; however, the measurements will remain within specified accuracy. For maximum accuracy, populate
all five temperature channels with 5-22 AWG thermocouples.