26
OsmoTECH PRO Multi-Sample Micro-Osmometer Service Guide
Chapter 4
Chapter 4: Diagnostics
This chapter describes basic diagnostic procedures that
you can perform.
4.1 Accessing the DIAGNOSTICS menu
1. From the Home screen, press > DIAGNOSTICS.
2. Select one of the following diagnostics options.
Function Description/Use
A/D Analog-to-digital circuit testing
Test Card Test card status
Sample probe Measure the sample probe resistance
Barcode Test the barcode scanner
Events View/export system events log
Printer Test the printer
LCD Inspect screen for dead pixels
Solenoid Executes multiple impacts
Motors Tests the sample and block motors, and the
wipe process
Cleaning Clean and inspect the sample probe
Maintenance Log routine cleaning, preventative
maintenance, and repairs of instrument, and
save to instrument events database
4.2 Testing the analog-to-digital converter
Use the A/D feature to test the analog-to-digital
converter (A/D), sample probe, block probe, cooling
assembly, and the eciency of heat transfer between the
cooling assembly components. Results are presented as
resistance (ohms), temperature (°C), and power
level(%).
If you select Fixed resistance, the test runs with known
resistor values (bypassing the cooling circuitry) to verify
that the A/D is operating correctly.
1. Press A/D.
If you select Fixed Resistance, the test runs with known
resistor values (bypassing the cooling circuitry) to verify
that the A/D is operating correctly.
2. Select a set point temperature.
After five minutes, the block temperature should
roughly equal the set point temperature.
NOTE: Power level is expressed as a percentage,
indicating how much power the thermoelectric
cooler uses to reach a temperature set point
sensed by the block probe. An increasing power-
level requirement indicates deteriorating
performance of the cooling assembly.
NOTE: When testing in this mode, appropriate readings
are 6200 ohms ±50 ohms. Readings outside this
range might point to issues with the A/D.
3. Press Exit to return to the Diagnostics menu.
To Next Page
Loading...
Need help?
General
