Thermo Scientific Ramsey MINI CK100, Operating And Service Manual

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4-4
4.4 Cold Start
It may be necessary to cold start the MINI CK100 in the event memory becomes corrupted. In
the event of a cold start, you have the option of installing the factory default constants or
simply returning the instrument to its previous running state.
The cold start can be forced through the menu DIAGNOSITCS SCROLL (see 3.13.7)
When the following screen displays, all field entry data has been replaced by the factory default
constants.
Select the language and follow the initial setup procedures.
4.5 Load Cell Excitation and Signal Voltage
1. Measure excitation voltage across terminal 21 negative and 20 positive in the scale
junction box. This should be 10 VDC
±
5%.
2. If the excitation voltage is incorrect then measure the excitation voltage in the MINI
CK100 across terminal 6 negative and the 1 positive.This should be 10 VDC
±
5%.
3. Measure DC millivolt signal voltage across terminal 22 positive and 23 negative in the
scale junction box. This should be within 0-30 millivolts DC (3 mV/V load cell).
4. Measure DC millivolt signal voltage across terminal 3 positive and 4 negative in the
MINI CK100 . This should be the same as Step 3 above.
5. The millivolt output is in direct relation to weight applied. As weight is increased,
output should increase.
4.6 Lithium Battery Replacement
The MINI CK100 volatile memory backup battery can be replaced without any special tools.
WARNING
DANGER OF EXPLOSION IF BATTERY IS
INCORRECTLY REPLACED.
Replace only with same or equivalent type recommended by Thermo Ramsey. Dispose of
used battery according to manufactures instruction on battery or return to Thermo Ramsey.
1. Turn the MINI CK100 power off at the mains.
2. Remove the battery from its compression socket.
3. Observe the polarity markings on the battery socket base before inserting the new battery.
4. Insert battery
5. Restore power to the MINI CK100.
6. Re-enter date and time on instrument set up.
-- MEMORY ERASED --
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key to continue to
ITA
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