IC-101 Electronics Module | FMB Oxford

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IC-101 Electronics Module

IC-101 Electronics Module


  • Dynamic range <1 pA to 200 μA
  • Integrated digitisation and filtering
  • Fibre-optic, RS-232 and RS-485 interfaces.
  • Integrated calibration test source
  • Full control provided of integration modes
  • External trigger capability
  • Analog monitor output
  • Frequency monitor output (VFC).
  • Optional 3 kV high voltage output for ionization chamber biasing.


  • Ionization chamber readout
  • Low current and charge measurement


  • Auxiliary HV output 0 to 3000V


Parameter Value
Operating principle Gated integrator (charge integrating amplifier)
Integration capacitor Dual, software selectable
Input noise < 100 fA rms + 1 fA rms per pF input load up to 100 pF (1 second integration, 100 pF capacitor)
Input offset < 10 pA , 15 to 25 C. Offset can be removed by zero subtraction.
Stability Output drift < 200 fA / C / hour
External accuracy Better than 0.5% of full scale in use, integration time 500 μsec to 1 sec, after calibration with built-in current source
Integration time User selectable, 100 μsec to 10 sec.
External gate input TTL 10 kohm impedance
Trigger modes Internal (autorun), external
Digitisation 16 bit bipolar
Averaging modes Multiple conversions per integration; multiple integrations per reading to increase digital resolution up to 20 bits
Auxiliary HV PSU (Factory option) 0 to 3000 V programmable (polarity and maximum voltage factory selectable), 0.3 mA max. Noise and ripple < 0.1%
Power input +24 V (+/- 2 V) DC, 300 mA typ, 500 mA max
Controls Two rotary switches for loop address and comms mode/baud rate
Displays Status LEDs (power, device status, comms mode, data RX/TX). “HV on” LED
Case material Stainless steel sheet
Weight 1.2 kg (2.6 lb)
Operating environment 10 to 35C (15 to 25 C recommended to reduce drift and offset) , < 70% humidity, non-condensing, vibration < 0.1g all axes (1 to 1000 Hz) Vibration must be as low as possible to measure at the lower limit of the dynamic range.
Shipping and storage -10 to 50 C, < 80% humidity, non-condensing, vibration < 2g all axes, 1 to 1000 Hz


Interfaces RS-232 or RS-485, 8-bit ASCII. Selectable baud rate up to 115 kbps. The electrical interface can be set to be RS-232 levels, or full-duplex differential RS-485.
Fibre-optic loop, 10 Mbit/sec serial, 9-bit asynchronous binary. Ethernet connection to host through A300 or A500 loop controllers.
Host computer ASCII communications based on SCPI.
Diagnostic host program supplied for Microsoft® .net framework. Binary DLLs available for Microsoft® .net, National Instruments™ Labview ™, Microsoft® C++.and Linux.

Monitor outputs

Parameter Value
Number One, analog voltage
One, frequency
Signal type Analog voltage +/- 10 V into 10 kohm.
Frequency 0 to 1 MHz TTL into 50 ohm.
Mapping Signals map the selected nominal full scale current range.


Parameter Value
Signal input RBNC female
HV out SHV
External gate in Lemo coax size 00
Monitor outputs Lemo coax size 00 for analog voltage
Lemo coax size 00 for frequency
RS-232/RS485 Six pin mini-DIN (“PS/2”)
1    Tx/Rs-485 Tx+
2    Rx / RS-485 Rx-
3    Gnd
4    n/c
5    RS-485 Tx-
6    RS-485 Rx+
Fibre optics TX & RX ST bayonet, suitable for 1mm plastic fibre or 200 μm HCS fibre.
Power in 2.1mm threaded jack. Mates with Switchcraft S761K or equivalent.
Ground M3 threaded stud
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