2. Description of the Barracuda
Hardware and Specifications
Barracuda & QABrowser Reference Manual
2012-10/4.3A
32
- EMM-1Ch/2Ch/Bias/BiasB
- EMM-BiasW
Reading×10
-6
or 100 fA
Reading×10
-6
or 2.5 fA
0.1 ms – 34000 s
1 – 65535 pulses
For Current the specified Inaccuracy is valid for Irradiation times > 100 ms. Below
that, the inaccuracy of the time will also affect. This since the Current is calculated
as the Charge divided by the Irradiation time. Please see section Waveforms and
Triggers for further description.
Current EMM-1Ch/2Ch
- High Sensitivity
- Unipolar positive
- Unipolar negative
- Bipolar
- Low Sensitivity
- Unipolar positive
- Unipolar negative
- Bipolar
2 pA – 95 nA
-2 pA – -90 nA
±2 pA – ±45 nA
1 nA – 10 µA
-1 nA – -10 µA
±1 nA – ±5 µA
±1 % or ±0.5 pA
±0.5 % above 100 pA
±1 % or ±10 pA
Current EMM-Bias/BiasB
- High Sensitivity
- Unipolar positive
- Unipolar negative
- Bipolar
- Low Sensitivity
- Unipolar positive
- Unipolar negative
- Bipolar
2 pA – 95 nA
-2 pA – -85 nA
±2 pA – ±47 nA
1 nA – 10 µA
-1 nA – -4.8 µA
4.8 µA – -1 nA/
1 nA – +5.2 µA
±1 % or ±0.5 pA
±0.5 % above 100 pA
±1 % or ±10 pA
Current EMM-BiasW
- Very High Sensitivity1
- Unipolar positive
- Moving average
- High Sensitivity
- Unipolar positive
- Low Sensitivity
- Unipolar positive
200 fA – 2.5 nA
40 fA – 2.5 nA
2 pA – 95 nA
1 nA – 10 µA
±1 % or ±20 fA
±1 % or ±4 fA
±1 % or ±0.5 pA
±1 % or ±10 pA
Note 1: To get access to the wide range of the EMM-BiasW, "very high" sensitivity must be
chosen. This alternative is only possible to choose in free run mode or in timed mode. See also
section Update Modes .
Pulses
Min. output peak current
- High Sensitivity
- High Sensitivity Ion Chambers
- Low Sensitivity
current (min. pulse width)
12.5 pA (4 ms) / 100 pA (0.5 ms)
50 pA (8 ms) / 400 pA (4 ms)
500 pA (4 ms) / 4000 pA (0.5 ms)
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