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REPORT: Input lag Part 6


Simply opening the case reveals that these extra parts are not exactly cheap. The gauge heads and assorted boxes fit perfectly into the tailored foam sections.

The fine connections on both sides of the gauge heads are already protected against accidental damage and undesired touching of the contact surfaces through their structure.

Left: The connectors to the oscilloscope are surrounded by thick metal. Right: Miniature coaxial connectors are also sunk into the exterior at the tips of the probes.

The gauge heads not only allow for differential signal reception, but also have what is known as TriMode™ measurement switching. Operating mode switching here allows the user to carry out asynchronous measurements (single ended), differential measurements (differential mode) or common mode measurements (common mode) without having to change the gauge head.

The probe tips

The scope of supply includes various solderable probe tips for various areas of application, a certificate of calibration, various connector cables, a calibration plate, a manual and various small parts which make it easier to attach a probe tip onto a circuit board.

Here, the "TriMode Long Reach Solder Tip", a probe tip for high bandwidths, represents the ideal combination for the P7508 gauge head if the highest level of precision is desired. However, attaching it is a finicky business, since two to three wires as thin as 0.02 mm must be mounted and soldered as illustrated in the example below.

Left: TriMode Long Reach Solder Tip with far beyond 8 GHz bandwidth, depending on the gauge head. Right: Example of ideal use of the probe tip.

The two other probe tips used in the test are easier to use, since small cable ends complete with resistors are soldered on already ex works.

Left: TriMode High-Temp Tip with bandwidth of up to 6 GHz. Right: TriMode Micro-Coax Tip with bandwidth of up to 4 GHz.

These are suitable for somewhat more moderate bandwidths of 6 GHz and 4 GHz respectively, which is fully sufficient for all measurements. They were only used for signals with frequencies considerably lower than 500 MHz.

The photo receiver

The requirements for the photo receiver were clearly defined: With a known, ideally negligible lag, light emitted by a monitor from a very limited section of the display surface should be transferred into usable electrical impulses. Here, therefore, the entire lag, from the radiation of the visible light, including the amplification of the signals, to the output to the oscilloscope should be considerably less than 1ms and here, the amplification should be sufficient to allow a signal to be measured.

Manufacturer Femto from Berlin was not only friendly enough to provide one of its high-quality products, but was also helpful enough to allow us to determine the total lag of the device in advance.

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