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The TDC1 is a combined moderate-speed counter and timestamping/timetagging device for processing electrical pulses in four independent inputs. It can accept a wide range of standardized signal standards including (NIM and TTL) and is completely powered from a USB2 connection. The internal clock source can be disciplined by an external 10 MHz timing reference for precise absolute timing.
In counting mode, the device has 4 independent counters registering events on each of the four inputs, and 4 counting coincidence events between 4 pairs of inputs that register counts for a selectable integration time from 1ms to 65s.
In timetag mode, the device registers the absolute time of the leading edge every signal event (pulse) at any of the input lines with a resolution of 2ns together with the logical state of all four input lines. This allows to identify complex detector patterns with a single device.
The TDC1 is bundled with open source scripts in Python and C to perform data collection and visualize real time counts and coincidences.
Price indicated is valid only for Europe, US, UAE, China, Taiwan, Korea, Turkey, Australia and South-East Asia.
| User Wiki hosted on Github |
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| Software Repository hosted on Github |
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| Python Package for S-Fifteen Devices |
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| GUI Repository hosted on Github *new 2022* |
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| Datasheet PDF Format |
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Physical Parameters:
| Size | approx 85mm x 46mm x 22mm |
| Weight | 150g |
| Power consumption |
<0.5W (100mA from USB bus) |
Signal Inputs:
| Impedance | 50Ohm (default) and 1kOhm (selectable by jumpers) |
| Input standards | TTL, NIM, custom (positive or negative pulses with a trigger level between -3.3V and +3.3V) |
| Absolute Maximum Input Amplitude | +4.2V/-4.2V |
| Minimal pulse width | 2ns |
| Minimal pulse separation | 2ns |
| Connector | LEMO00 size coaxial connector (optional: SMA) |
Clock reference:
| External reference frequency | 10MHz nominal (accepts 9...11MHz) |
| External reference amplitude | 100mVpp min, 2.3Vpp max |
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automatic or forced manual |
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<50ppm, temperature drift TBD |
Counter mode parameters:
| Maximal count rate | 80MHz in each channel |
| Integration time | 1ms to 65535ms in steps of 1ms |
| Pairwise Coincidences | Ch1-Ch3/Ch1-Ch4/Ch2-Ch3/Ch2-Ch4 |
Timestamp mode parameters:
| Timing resolution | 2ns |
| Timing jitter | <200ps (nominal) |
| Maximal counting rate | <13Mevents/s average, <250 Mevents/s in bursts of <256 events (see detail specification) |
| Dead time between events | None |
Interface:
| Host connection | USB CDC ACM class / virtual com port (no device driver necessary) |
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Text or binary |
Software:
| Windows, Mac, Linux | Labview .vi and Python scripts hosted at Github (MIT Licence) |
Frequently Asked Questions:
Check that the trigger level is set appropriately.
Ensure that the USB port is able to supply enough current for the device. Plug directly to the host to check.
In PAIRS mode, a coincidence is counted when both input channels are high within a time step of 2ns (Even when the edges of the two pulses occur in different time step. Thus the effective coincidence window is the sum of both pulse widths.
There is an issue with the latest Windows (>8) serial driver that has a lower throughput compared to older (<7) versions causing data to be corrupted in transit from the TDC1 to the host. A workaround that checks for corrupted data at high count rate is implemented in pyS15
