Firing Voltage

The following information applies to the : CAL3K-AP , CAL3K-A , CAL3K-U, CAL3K-F.


The firing voltage determines the amount of energy put into the firing wire to make it glow and ignite the cotton fuse. The energy (voltage) depends on:

  1. The type of firing wire material and size
  2. The age of the firing wire: it gets thinner (oxidizes) with every firing
  3. The oxygen pressure: High pressure cools the wire

There are no strict rules on how to setup the firing voltage. A setting of 25V is standard. If the wire blows off with every firing then the voltage is set too high. You should get approximately 50 firings out of one wire.

If you get ‘miss-fires’ and you find the cotton is intact but lying inside the crucible, then the voltage is set too low.

The ‘Firing voltage’ can be set from a PC. It may be possible to set it from the CAL3K keyboard if your setup allows it. If it does not allow it could be that it is password protected.

CAL3K Keyboard Commands - Escape Key | DDS Calorimeters Home
CAL3K Keyboard Commands - F Key | DDS CalorimetersCAL3K Keyboard Commands - I Key | DDS CalorimetersCAL3K Keyboard Commands - R Key | DDS CalorimetersCAL3K Keyboard Commands - I Key | DDS Calorimeters Start of Command
CAL3K Keyboard Commands - Enter Key | DDS Calorimeters Accept Command
CAL3K Keyboard Commands - 2 Key | DDS CalorimetersCAL3K Keyboard Commands - 5 Key | DDS CalorimetersCAL3K Keyboard Commands - Fullstop Key | DDS CalorimetersCAL3K Keyboard Commands - 1 Key | DDS Calorimeters Enter Value
CAL3K Keyboard Commands - Enter Key | DDS Calorimeters Accept Value

READ FIRING VOLTS

The ‘READ….’ Keyboard commands are ‘non-influential’, they just monitor in real time a particular condition. The firing voltage should be very close to the setting of 25Volts.

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COTTON & WIRE CORRECTION

The sample is ignited by sending a current through the firing wire. This makes the wire glow, which in turn ignites the cotton thread, which in turn ignites the sample.

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SPIKING OPERATIONS

The spiking method is called for when a sample has a very low CV or burns reluctantly. Then a better burning material is added to the sample to help the process. The better burning sample is the spike.

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