Current Measurement
F-type devices are for applications with relatively high currents from nanoamps to milliamps or when high-speed data is required.
These devices use the I-V converter circuit, also known as a transimpedance amplifier. The input current passes through a resistor to develop a voltage according to Ohms law. An operational amplifier is used to balance the voltage with varying currents to provide a high degree of linearity across the measurement range.
The voltage output continuously tracks the current input. The bandwidth of the operational amplifier and stray capacitances attenuate very high frequencies. Low-pass filters attenuate frequencies closer to the ADC sample rate.
I128
128 Channel Charge Integrator Digital Electrometer
FX4
High-speed Quad-channel Precision Electrometer
IC101
Precision Electrometer Digital Current Integrator with High Voltage
I3200
32-Channel Charge Integrator Digital Electrometer
F460
4 Channel Precision Electrometer with High Voltage
F100
Fast Digital Electrometer
I404
4 Channel Charge Integrating Digital Electrometer
I400
4 Channel Biased Input Charge Integrating Electrometer
I128S
128-Channel Electrometer
Charge Measurement
I type devices use a converter circuit with a capacitor as the feedback element. The output is the voltage across the capacitor. Using a capacitor to integrate suppresses noise and allows small input currents.
I type devices are good for measuring fast pules and very small currents.