ILP-8

Integrator Long Pulse – 8 Channel (ILP-8)

Features
– 8 differential independent integrator channels
– Very large dynamic range (22 bit at 1000 sec)
– Continuous stable operation while gated on
– 10E-9 Vs/s figure of merit (RC*Drift Error/Run Time) at 10e4 second
– Exceeds ITER integrator stability requirements (drift error, run time, common mode rejection)
– 5 MHz bandwidth
– 1 µs to 100 ms RC time constant
– 50 Ω to 100 kΩ factory settable impedance input
– Low output impedance
– I/O connectorization includes BNC, RJ45, and SCSI
– National Instruments DAQ drivers available

Applications
– Magnetic field Measurements
– Current Measurements
– Analog Voltage Integration

Description
The ILP-8 is an ultra stable, high frequency, analog differential integrator. The period of integration can range from 1 s to continuous and is controlled by an external gate. The integrators are standardly packaged in a 1U rack mountable chassis. A number of parameters are factory selectable, based on the selected application. These include the I/O connectorization, the integration RC time constant, and the integrator input impedance.

The ILP-8 integrator measures both extremely small fields and extremely large fields with high precision. For example, if connected to a loop with a 0.1 m2 area (100 turns 3 cm in diameter) wound on ferrite with a relative permeability of 1000, the integrator would produce a 1 mV output when measuring a 100 pT field. When measuring medium to large fields, small air core pickup coils would be used. Since air core coils do not suffer saturation issues, the ILP-8 integrator can measure very large currents, for very long times, without the usual droop and saturation issues encountered when using standard current monitors/transformers. There is no inherent limit to the maximum field size or current that can be measured.

Because of the ILP-8’s extremely high gain and high frequency of operation, the integrator has an unprecedented effective dynamic range. For example, if given a 1000 second square wave input signal, using a 12 bit digitizer, the ILP-8 can produce a post processed signal with 100 ns temporal resolution, and 22 bits of dynamic range information. This capability allows for extremely small high frequency detail to be resolved on much larger and slower signals.

[Specify when ordering: RC time constant, input termination resistance]