Elsys AG
www.elsys-instruments.com
22
TraNET FE User Guide
5.4 Standard Filter
On each channel a Low-Pass First Order Filter with
100 kHz or 1 MHz (10 KHz, 100 kHz for TPCE-I)
bandwidth can be activated.
The analog bandwidth of the amplifier itself is set around the half of the maximum sampling
rate, eg. 10 MHz for a 20 MHz board.
When the cards are used below the maximum sampling rate an internal digital filtering is
done. Therefor an Anti-Aliasing Filter is not needed in the most situations. The picture above
shows a 20 MHz card used at 1MHz. High frequency noise above 10 MHz is filtered by the
analog bandwidth of the amplifier with 20 dB/dec. Noise between 500 kHz and 10 MHz is
digital filtered an will not produce any mirror signals at lower frequencies.
digital
filtered
10 kHz 100 kHz 1 MHz 10 MHz 100 MHz
0 dB
- 20 dB
Analog Bandwidth
5.5 Trigger Logic
Elsys DAQ cards are available with two different trigger packages, the standard trigger pack-
age and the Advance Trigger package:
Standard Trigger
Advance Trigger
• Positive/Negative Slope
• Window In/Out
• all Standard Trigger
• Pulse > & Pulse <
• Delay > & Delay <
• Slew Rate Trigger
• State Trigger
• AND Trigger linking
• Trigger on multiplied signals (Power Trigger)
• Trigger on Marker Inputs
(TPCE only)
Each channels can be the trigger source at once. The first channel which detects a trigger will
trigger the measurement. One external Slope trigger is available on the 25-Pol D-SUB connector.
