do_troubleshooting
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do_troubleshooting [02/11/2016 15:55] pieter |
do_troubleshooting [10/04/2018 09:34] pieter [Check the electrode] |
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| 2. Some tests of the electrode with an Ohm meter: | 2. Some tests of the electrode with an Ohm meter: | ||
| * Remove the membrane cap and rinse the electrode tip. Gently dry it by dipping a soft tissue. | * Remove the membrane cap and rinse the electrode tip. Gently dry it by dipping a soft tissue. | ||
| - | * When measuring the Ohmic resistance between the 2 contacts of the BNC plug, you should measure a NTC resistance value that varies with the temperature (decreasing when heating up). Normally is it a 10K resistance (10000 Ohm @25°C) but might be a 5K resistance (5000 Ohm @25°C) also for older models. | + | * When measuring the Ohmic resistance between the 2 contacts of the BNC plug, you should measure a NTC resistance value that varies with the temperature (decreasing when heating up). Normally is it a 10K resistance (10000 Ohm @25°C) but might be a 5K resistance (5000 Ohm @25°C) also for older models. |
| - | * Another measurement is between the BNC plug contacts and the metals (Lead and Platinum) at the electrode tip. Be careful when touching the Platinum metal cap at the tip as it easily detaches from the electrode which would destroy it permanently. Each metal is connected to one of the BNC contacts and should measure around zero Ohm. | + | * This same NTC value should be measured between the two electrode metals Lead and Platinum at the electrode type. Value? ....... Ohm |
| - | * A resistance measurement between the temperature banana plugs should give a resistance value around 1100 Ohm @ 25°C. This resistance should increase when becoming warmer. | + | * Another measurement is between the BNC plug contacts and the metals (Lead and Platinum) at the electrode tip. Be careful when touching the Platinum metal cap at the tip as it easily detaches from the electrode which would destroy it permanently. Each metal is connected to one of the BNC contacts and should measure around zero Ohm. |
| - | 3. When 1. and 2. are found to be OK. The electrode should be reassembled. Watch very carefully for the correct placement of membrane, O-ring and membrane cap. After reassembling, | + | * Value between the BNC outer conductor and Lead metal? ....... Ohm |
| + | * Value between the BNC central pin and Platinum tip? ....... Ohm | ||
| + | * Value between the BNC outer conductor and Platinum tip? ....... Ohm | ||
| + | * Value between the BNC central pin and Lead metal? ....... Ohm | ||
| + | * A resistance measurement between the temperature banana plugs should give a resistance value around 1100 Ohm @ 25°C. This resistance should increase when becoming warmer. | ||
| + | 3. When 1. and 2. are found to be OK. The electrode should be reassembled. Watch very carefully for the correct placement of membrane, O-ring and membrane cap. After reassembling, | ||
do_troubleshooting.txt · Last modified: 13/06/2018 08:19 by pieter
