Probably selfmade

See 3a

A contacting conductivity cell has two or more flat electrodes of known surface area and placed at a known distance from each other. They are made of conductive material, such as graphite, stainless steel or platinum. When an alternating voltage is applied between the electrodes, conductive ions in the liquid produce an electric current. High conductivity indicates a high ion concentration.

To check point-to-point connections.

pH meter with connection for Pt100 temperature sensor temp. range 0 - 100 degrees C

pH meter with connection for Pt100 temperature sensor temp. range -5 - 130 degrees C

Include: Filter type ZS 0120 Range 20-20000 Hz Filter type ZS 0121 Range 200-5000 Hz

The HP 83651 is a high-performance synthesised sweep-generator manufactured by Hewlett-Packard (HP), now part of Keysight Technologies. This signal generator is designed for RF (Radio Frequency) and microwave applications, providing precise and stable signal generation capabilities. Key features of the HP 83651 include its ability to generate swept frequency signals across a wide frequency range. It's commonly used in various applications such as communications, radar, and electronic warfare for testing and development purposes. As the HP 83651 is part of a legacy product line, it's essential to refer to the specific documentation and manuals provided by Keysight Technologies for detailed specifications, operational guidelines, and other relevant information. If you're working with this equipment, it's also worth checking if there are newer models or series available for your testing needs.

An S-parameter test-set is a component of a network-analyser used for measuring and characterising the behaviour of electronic devices, particularly in the radio frequency (RF) and microwave frequency ranges. S-parameters, or scattering parameters, describe how a device or network responds to signals at different frequencies. The S-parameter test-set typically includes various components such as directional couplers, bridges, and detectors. These elements allow the network analyser to measure the amplitude and phase of signals as they pass through or reflect off the device under test (DUT). S-parameters are represented in matrices, and different S-parameters (like S11, S21, S12, S22) provide information about signal reflection and transmission characteristics. For example, S11 represents the reflection coefficient at port 1, while S21 represents the transmission from port 2 to port 1. Overall, the S-parameter test-set plays a crucial role in the characterisation of RF and microwave devices, providing valuable insights into their performance, impedance matching, and signal behaviour across a range of frequencies.

The Agilent 6622A power supply outputs combine with a built in GPIB interface. Simple programming commands ease access to all features and capabilities. Dual ranging outputs provide greater flexibility in available voltage and current. Two, three, or four isolated outputs are integrated into one package, conserving rack space and GPIB addresses. Most of the outputs also provide dual ranges, for more current at lower voltage levels. The outputs can be connected in parallel or series to further increase the flexibility that these products offer the system designer. Programming is done using industry standard SCPI commands. Test system integration can be further simplified by using the VXIplug&play drivers. These power supplies help reduce test time with fast up and down programming, enhanced by an active downprogrammer which can sink the full rated current.

The HP 8510C is a network-analyser manufactured by Hewlett-Packard (now known as Keysight Technologies). This network-analyser is part of the HP 8510 series and is used for measuring the performance of RF (Radio Frequency) and microwave devices, such as amplifiers, filters, and antennas. Key features of the HP 8510C include its ability to analyse complex impedance, perform S-parameter measurements, and characterise devices over a wide frequency range. The analyser typically operates in the microwave frequency range, making it suitable for applications in telecommunications, radar systems, and other RF/microwave engineering fields. It's important to note that the HP 8510C is a legacy product, and newer models and series of network-analysers have been developed by Keysight Technologies since its release. If you are working with this equipment, be sure to consult the relevant documentation and resources for accurate information and support.

Besides the HP 8510C Network analyzer and its display unit the testsystem configuration contains:
an Agilent 8517B S-Parameter Test Set with a range of 45 MHz - 50GHz
an Agilent 83651B Series Synthesized Sweeper with a range of 10Mhz - 50Ghz
and a HP 6622A System Power Supply unit.

Range 0 - 50 (inf) MOhm Voltage: DC or AC; 0 - 260 V or 0 - 520 V.

Three scales: 0 - 0.5 MOhm 0.4 - 10 (inf.) MOhm 10 - 10,000 MOhm. Adjustable voltages: 20 V - 2000 V.

Legacy A.E. Krösing, Stabilix b.v. accessory: test crystal in small box