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Counting unit
C9945-14
The C9945-14 is counting unit with a USB interface and can be used as 16 ch photon counter. This unit uses the double-counter method that has two counter circuits to allow measurements with no dead time. C9945-14 model has LVDS input for multichannel photon counting head.
Specifications
| Parameter | Description / Value | |
|---|---|---|
| Input | Number of input signals | 16 ch (*1) |
| Signal input level | LVDS | |
| Signal pulse width | 5 ns or longer | |
| Input impedance | 100 Ω | |
| Counter | Counter method | Double counter method |
| Max. count rate | 100 MHz | |
| Max. counter capacity | 228 counts / counter gate (*2) | |
| Internal counter gate time | 500 ns to 1 s (1, 2, 5 step) (*3) | |
| Trigger | Trigger method | Software trigger / External start trigger |
| External start trigger signal input level | TTL | |
| I/O | Number of output | 2 |
| Output level | TTL | |
| Number of input | 2 | |
| Input level | TTL | |
| Synchronous signal input level | LVTTL | |
| ID switch | 0 to 7 | |
| Buffer capacity | 4096 (word) (*4) | |
| Compatible OS | Windows® 11 pro (*5) | |
| Interface | USB 2.0 | |
| Supply voltage | DC 6.5 V to 8.0 V / 0.5 A | |
| Operating ambient temperature / Humidity | +5 ℃ to +45 ℃ / 80 % or less (No condensation) | |
| Storage temperature / Humidity | 0 ℃ to +50 ℃ / 85 % or less (No condensation) | |
| AC adapter | AC input | AC 100 V to 240 V |
| Output | +7 V / 1.6 A | |
Notes
*1 Data for all 16 channels are always output, independent of the number of connected heads.
*2 Possible to select bit numbers 28, 16, 8, 4 for count / counter gate.
*3 This specification shows the maximum input frequency per gate, NOT the continuous data output rate. In continuous operation, USB 2.0 speed and buffer capacity limit the gate time and data rate. Very short gate times (μs or less) are not guaranteed.
*4 1 (word) = 2 (byte) = 16 (bit)
*5 Power save mode of a personal computer should be turned off.
* CD-ROM (Software), AC adapter & USB 2.0 cable are supplied.
Block diagram
Dimensional outline (Unit: mm)
Connection example
- Confirmation
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