2. Description of the Barracuda
Hardware and Specifications
Barracuda & QABrowser Reference Manual
2012-10/4.3A
30
between –300 to 300 V.
· EMM-BiasB, single channel electrometer module with polarizing voltage (bias)
between –300 to 300 V on either the triaxial connector or on a banana
connector.
· EMM-BiasW, single channel electrometer module with polarizing voltage (bias)
between –300 to 300 V on either the triaxial connector or on a banana
connector. Unipolar positive input only.
The single channel electrometer module EMM-1Ch measures exposure time and gives
the waveform with a resolution of 0.5 ms (low-speed mode). The QABrowser can show
the waveform for each exposure.
The dual channel electrometer module EMM-2Ch consists of two identical
electrometers as the one in EMM-1Ch. It can measure two electrometer signals
simultaneously. Exposure time is measured individually on the two channels.
The electrometer modules with polarizing (bias) voltage supply, EMM-Bias,
EMM-BiasB, and EMM-BiasW, are basically all the same electrometer as the one in
EMM-1Ch, but with an added bias voltage supply. They have floating input and the
bias voltage is selectable. The EMM-BiasB and EMM-BiasW also includes the option
to output the bias on a banana jack, for use with BNC/Banana type ion chambers. The
EMM-BiasW has a wider measurement range, but is unipolar only. All the bias
modules are only available as single channel electrometers.
2.6.4.2 Specifications, EMM
The inaccuracy is here defined as the root of the square sum of systematic errors,
which has not been eliminated, and random errors (dispersion around a mean value).
The calculation of the inaccuracy is based on 15 different measurements and with a
confidence level of 95 %. Of the total inaccuracy, random error is 20 % and general
inaccuracy is 80 %.
Note: Irradiation time is often called exposure time in daily use.
Reference conditions
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