Calibration Of The Reference Resistors - Ametek DTI 100 User Manual

9.3

Calibration of the reference resistors

Use following procedure for recalibration of the internal reference resistors:
1. Select the menu reference resistors.
2. Enter the date format as YYMMDD.
3. Connect the two reference resistors to the sensor inputs as shown on the figure
section 5.2.1.
4. Enter the value of the two reference resistors.
Current maximum resistor : 360.000 Ohm
Current minimum resistor :
Default resistors for DTI (0.0 Ohm & 360.0 Ohm)
Enter reference resistor value in sensor input 1 :
Enter reference resistor value in sensor input 2 : 355.0000
< ESC > aborts, Press < Enter > to accept
The default selection should only be used if the previous calibration went wrong.
Now the calibration will show the determination of the internal reference resistors calculated
from the two connected input values:
Press <ENTER> when the reading is stable (±0.0005 Ω).
5.
6. Confirm the taken sample by pressing <ENTER> again. If the taken sample is at the
limit of the stability criteria press <ESC> to make a new.
7. When the calibration is finished the software downloads the new reference resistor
values to the DTI which will take about 1 second.
8. Check the reading of the connected references in measure menu or the display.
The values must not differ more than ±0.001 Ω for the calibration to be accepted.
30/32
Determine new resistors
0.000 Ohm
Calculated resistor
New maximum resistor value :
New minimum resistor value :
< ESC > aborts, Press < ENTER > to accept
360.0180
49.9975
11-06-2001
No
55.0000 Ohm
Ohm
100975 05