METRON PS-416M, Руководство пользователя и обслуживания

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4. Control and Calibration
This chapter explains PS-416M maintenance procedures, including testing
and calibration.
4.1 Required Equipment
•
Digital multimeter, 10pV resolution, 0.1% accuracy.
•
Frequency counter
•
Oscilloscope
•
Power supply variable V/A
4.2 Preparation
1. Set the switches on PS-416M as follows:
Power: Off
Base: 1K
Lead: II
Sensitivity: 40
Temperature: 30 º C
2. Connect a current to the battery contact. Adjust the voltage from 9V
±
0.2V with a power limitation of 70mA
±
20mA.
4.3 Function Testing
1. Turn the Power Switch on. The LCD display will briefly show the soft-
ware version number, before showing the active ECG function (03).
Press the Key Switches beneath the display and check that the number
displayed increases or decreases with each press. Press
Enter and check
that the display flashes once.
2. Measure the current consumption from the power supply.
Requirement: 19mA
±
2mA.
3. Measure the operating voltage in PS-416M with the multimeter. The fol-
lowing values are acceptable:
Testpoints
- +
Value Maximum
Deviation
TP10 - TP4 +5V ±
0.2V
TP10 - TP5 -5V ±
0.4V
TP10 - TP9 +1.24V ±
0.03V
TP14 - TP11 +7V +6 - 1V
TP14 - TP12 -7V +1 - 6V
TP14 - TP13 +5V ±
0.2V