Seaward DO4000 - Manual (Page 17)

Operating Instructions Digital Ohmmeter DO4000 Series
15
+I
+U
-I
-U
GROUND
Connection Diagram for Pt100 Plug
View from solder pins (rear) of plug
15. Calibration Process
WARNING! Competent and trained personnel should only carry this out. The
calibration is made from the front panel and no mechanical adjustments are
necessary.
Equipment required - Milliohmmeter Test Standard type MTS2 or a set of Resistance
standards 4m
Ω, 40mΩ, 400mΩ, 4Ω, and 400Ω and 4kΩ.
The 4000, 4001 and 4002 milliohmmeters are designed to minimise all calibration. The
carefully selected internal standards are used to give long term stability and minimal
drift. However, for those wishing to adjust the ohmmeter, proceed as follows.
The ohmmeter should be placed in a temperature controlled environment for at least
2 hours before calibration.
Connect the milliohmmeter standard type MTS2 to the measuring terminals. Press
and hold the CAL button and switch on the unit. The display will will show CODE for
a few seconds and then 0000 with a flashing curser on the first zero. The calibration
code 9252 must be entered using the UP and Down keys to increment or decrement
the value, the next digit is selected using the other arrow keys, press OK to valid the
code. Once the correct code number is validated the 4000 will enter the calibration
mode and the CAL Led will be lit.
The display will be set at 0.0 with the first digit flashing, set the zero on the MTS2 and
press OK. This will calibrate the zero reading on the first range, the display will then
move on to show full scale on that range 4.000 again with the first digit flashing. With
the 4000 ohm value selected on the MTS2 the exact value of the standard may be
entered using the arrow keys as before, once the correct value is entered press OK.
The 4000 will then automatically move to the next range, proceed as above until all
ranges are calibrated then press the CAL key to exit the calibration mode.
To change Pass code
1.
Press and hold down CAL key whilst powering up DO4000
2. Display = CODE then 0000
3. Enter CODE ( factory default code = 9252)
4. Display = 0.000
5. Press and hold down EDIT key for 2 seconds
6. Display = CODE then 0000
7. enter new 4 digit code number and press OK
8. Display = CODE then 0000
9. Re-enter the 4 digit code to verify and press OK
10. Display will read 0.000 ready for calibration
11. Note if second entry (confirmation of code is not the same as the first entered
number the DO4000. DO4001 will give long Bleep and return to step 2
12. Finally record the and keep the new CODE Number safely