Quorum Q150T S Instruction Manual
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Q150T Sample Preparation System10473 - Issue 5 36 Q150T - Instruction Manual5.7.2 The ramped current profileTo achieve the controlled thickness this process uses a controlled evaporation currentprofile (see Figure 5-5).Ramped carbon processEvaporation timeOutgas time051015202530354045500 10 20 30 40 50 60 70 80 90 100Time(s)Current(A) Ramp terminatedPreEvap End currentRamp terminated atEvaporation CurrentCurrent increasing atCurrent Ramp RateCurrent increasing atPre Evap RateOutgascurrentFigure 5-5. Ramped Profile with default parametersThis consists of four phases:1. The rods are outgassed at the Outgas Current for the Outgas Time. The shutteropens and the evaporation starts.2. The evaporation current increases at the Pre Evap Rate until the value of PreEvapEnd Current is reached.3. The evaporation current now increases at the Current Ramp Rate until theEvaporation Current value is reached or the Evaporation Time has expired.4. The evaporation current is held constant until the Evaporation Time has expired.If you observe excessive sparking during the first 30 seconds of theevaporation stage the Pre Evap End Current parameter should be reducedby 1A at a time (but no lower than 27A).If excessive sparking is seen 30 seconds or more into the evaporationstage, reduce the Current Ramp Rate.If you change Ramped Profile parameters ensure that the evaporation time is sufficientto achieve a constant current for at least 8 seconds (but no more than 30s) at the end ofthe profile.The default settings are correct for use with a 1.4mm spigot. However, there is often aslight variation in the tooling of the rod shapers. You can correct the default currentsetting for the actual rod spigot size using the following formula:New current =Spigot diameter2 x Default current1.69For example, if the actual spigot diameter is 1.1mm you should use an evaporationcurrent of 30.8A. |
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