MPS450 SERVICE MANUAL CALIBRATION
14
CALIBRATION INSTRUCTIONS
SETUP FOR CALIBRATION
Following are setup instructions for calibrating the MPS450.
(References to function keys – [F1], [F2], [F3], and [F4] – refer to the 4 blue keys located on the
keypad just beneath the LCD.)
1. Warm up the DMM and power supply for 20 minutes.
2. Put on the ESD wrist strip, and ensure that it is functional.
3. Remove the tamper-resistant Quality Seal from the rear panel. (Note that breaking the
tamper seal voids the factory calibration.)
4. Connect the battery eliminator, or install fresh batteries.
5. Turn on the MPS450 by depressing the green button.
6. Wait until the power-up sequence has completed (6 seconds).
7. Press the SETUP key (labeled in yellow just above the corresponding 0 number key).
8. Select > by pressing the [F4] key.
9. Select UTIL by pressing the [F3] key.
10. Locate the CAL SWITCH through the hole in the rear panel. While holding the CAL
SWITCH depressed (using a pencil or similar item), select CAL by pressing the [F1] key.
11. The display reads
Start w/raw constants? If the unit has not been calibrated before, or if the
microprocessor has been changed, select YES by pressing the [F1] key. If the unit has been
calibrated before, select NO by pressing the [F2] key.
CALIBRATION PROCEDURE
Following are calibration instructions for the MPS450. (Instructions to “Zero the DMM” refer to
pressing the button [on the DMM] that nulls the reading.)
NOTE: The following step numbers match the calibration step numbers displayed
on the LCD screen of the MPS450 during the calibration procedure.
1) ECG High-Range Reference:
¾ Connect the +DMM to the RA post, and connect the –DMM to the LL post.
¾ Set the DMM to read 100 mV DC.
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