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. Author manuscript; available in PMC: 2019 May 1.
Published in final edited form as: Int J Audiol. 2017 Sep 8;57(SUP2):S27–S40. doi: 10.1080/14992027.2017.1370139

Table 1.

Conversion of Clinical units (CU) to Charge in dB (re:1nC). For a current level of 200 clinical units (CU) and a pulse width of 25 μs, the current in microAmps (μA), charge in nanoCoulombs (nC) in dB re 1nC varied between implant types.

Example 1:
CI24RE (CIC4 chip)		 Example 2:
CI24M and CI24R (CIC3 chip)
Current in microamps (μA) μA = 17.5 * 100 (CU/255) 648.14 μA = 10 * 175(CU/255) 574.44
Charge in nanocoulombs (nC) (μA*10−6)* (μs*10−6)* 10−9   16.20 (μA*10−6)* (μs*10−6)* 10−9   14.36
Charge in dB, re: 1nC 20 × log (nC)   24.19 20 × log (nC)   23.14