I200 2-channel digital electrometer
Features
- Two independent gated integrator channels
- Dynamic range 0.1pA to 100 μA
- Integrated digitisation and communications
- Integrated calibration test source
- Selection of current and charge integration modes
- External trigger capability
- Optional high-precision analog output for servo control applications
- Auxiliary I/O port
Applications
- Ionization chambers
- Two electrode beam position monitors
- Photodiodes
- Ultra-low current and charge measurement
- With servo control option:
- Stabilisation of double crystal monochromators for synchrotron beamline experiments by control of the crystal cage piezo motor amplifier
- Stabilisation of beam position in charged particle or photon beamlines
Options
- Auxiliary HV output 0 to 1000 V
- Alternative feedback capacitor options
- Servo control options
Specifications
| Parameter | Value |
|---|---|
| Operating principle | Gated integrator (charge integrating amplifier) |
| Integration capacitor | Dual, selectable |
| Input noise | < 10 fA rms + 1 fA rms per pF input load up to 100 pF (1 second integration, 10 pF capacitor, 0 V bias) |
| Input offset current | < 100 fA at 0 V bias, 25 C < 600 fA at 0 V bias, 50 C < 200 fA at 400 V bias, 25 C |
| Stability Output drift | < 5 ppm / C / hour |
| Integration time | User selectable, 100 μsec minimum |
| Integration modes | 0: continuous current; 1: continuous charge, 2: lossless charge; 3: external gate integration; 4: externally-triggered burst mode |
| External gate | 0/+5 V, 50 ohm or fibre-optic receiver, software-selectable |
| Digitisation | 16 bit bipolar, 250 kHz |
| Auxiliary HV PSU | (Factory option) 0 to 1000 V programmable (polarity and maximum voltage factory selectable), 1mA max. Noise and ripple < 0.1% |
| Power input | +24 V (+/- 2 V) DC, 350 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 transmission rcv/xmit). “HV on” LED |
| Case material | Stainless steel sheet |
| Weight | 1.64 kg (3.6 lb) |
| Operating environment | 10 to 35 C (15 to 25 C recommended to reduce drift and offset) , < 70% humidity, non-condensing, vibration < 0.1g all axes (1 to 1000 Hz) |
| Shiping and storage environment | -10 to 50 C, < 80% humidity, non-condensing, vibration < 2g all axes, 1 to 1000 Hz |