System for multichannel measurement of electrical quantitites

ClassOther Analyzer / Spectroscope
Responsibleprof. Ing. Kamil VRBA, CSc.

System for multichannel measurement of electrical quantitites

The system allows easy realisation and automation of measurements of many electrical quantities simultaneously. The main component is Agilent 34980A multifunction switch/measure unit equipped with 80-channel multiplexer array. The measure unit is supplemented by 2-channel synchronous multifunction signal generator Agilent 81150A.

1. Agilent 34980A – is basically a fast and accurate multimeter which is equipped with input multiplexer. Some important parameters include:

-6 1/2 digit resolution.
-Up to 3000 readigns/second.
-Voltage range 100 mV to 300 V, better than 0.003% accuracy.
-Current range 10 mA do 1 A, better than 0.05% accuracy.
-2-wire and 4-wire resistance measurements, 100 ohm to 100 Mohm range.
-Frequency from 3 Hz to 300 kHz.
-80 measuring channels (two Agilent 34921A multiplexer cards), every channel switches Lo and Hi multimeter terminals.
-4 ms typical channel swiching time.
-The switching array can be expanded by up to 6 more cards.
-USB, GPIB and Ethernet (including LXI) interfaces for remote control.

2. Agilent 81150A – essentially includes three different signal generators in one instrument:

-Analog arbitrary waveform generator,
-pulse pattern generator for digital circuits,
-programmable noise generator.

The analog generator has parameters:

-14-bit resolution, 512 kSa pattern memory, up to 2 GSa/s speed.
-Output frequency up to 240 MHz.
-Many pre-defined signal patterns which are easy to set up via built-in graphical user interface.
-Supports sweeping and bursting of the output signal patterns.
-Supports AM, FM, PM, PWM and FSK modulations.
-The output analog signal can be injected with noise from the noise generator.

The pulse pattern generator has parameters:

-Compatible with all current families and technologies of digital circuits.
-Supports two, three and four-state logic signals.
-Up to 120 Mbit/s output speed.
-16 Mbit pattern memory.
-Can generate pseudorandom binary sequences with lengths up to 2^31 bits.