TB 9-5855-1890-35
(2) Set offset voltage switch to ALIGN.
(3) Adjust offset voltage potentiometer R4 (fig. 1) for an indication change of 0.1 V
dc on digital voltmeter.
NOTE
If ∆T is less than 4.05 oC, decrease offset voltage; if ∆T is
greater than 4.95 oC, increase offset voltage.
NOTE
As temperature indication nears in-tolerance condition, it
may be necessary to adjust offset voltage in 0.05 V dc
increments.
(4) Set offset voltage switch to ON.
(5) Replace temperature controller cover plate, close shroud access hatch, and
allow 15 minutes for temperature stabilization.
(6) Observe and record indication on differential voltmeter.
(7) Using differential thermocouple set calibration data and indication on
differential voltmeter, calculate the temperature difference indication.
(8) Repeat (1) through (7) above as required to produce a temperature difference
indication between 4.35 oC and 4.65 oC.
(9) Set power switch to OFF, but do not disconnect test setup. Allow TI to cool
for 15 minutes.
(10) Set voltage offset switch to ALIGN.
(11) When differential voltmeter indicates 0 l0 V, set power switch to ON and
immediately observe digital voltmeter indication and record as Vo (new).
(12) Set power switch to OFF.
(13) Set voltage offset switch to ON.
9. Final Procedure
a. Annotate value of Vo (new) on offset voltage label located on TI temperature
controller (R).
NOTE
If TI has not required adjustment, record previous offset
voltage as Vo (new).
8
CHANGE 2
PIN: 060578-001
