(4)Condenser lens astigmatism correction

-Press STIG to activate stigmator control.

-Press COND soft key so that it is highlighted (the default is OBJ).

-Condense the beam.

-Use MULTIFUNCTION knobs to correct the astigmatism. The beam should be round when changing the setting of the INTENSITY knob, or the filament image will be sharpest if filament is under-saturated.

-To see the sharp image of filament, three conditions, under-saturated, crossover, and free from astigmatism, must be met.

-Press STIG to de-activate stigmator control.

(4)Pay attention to filament image while slowly increase filament current to saturate (prefer slightly under-saturate) position. Emission current should be 5~8 µA.

(5)Check aperture center by spreading the beam, make sure that beam spreads without sweep.

(C)Alignment of Imaging System:

(i)Voltage Center Alignment

To align the imaging system, the AC component is superimposed on the accelerating voltage in order to move the image radially. The center of the radial movement (called “voltage center”) is then matched with the center of the fluorescent screen. The main purpose of this step is to center the beam tilt so there won’t be a tendency to have a two-dimensional image smeared out in one direction. This is very important in doing high-resolution work.

(1)Z-alignment (eucentric height adjustment)

-Rough focus the sample at 10,000 to 20,000X.

-Find an identifiable object and center it on the screen

-Tilt the sample. This may cause the center of the field of view to move towards the edge of the projection screen if the specimen is not at eucentric height position.

-Set the specimen height at the point where there is no movement of the specimen upon tilting by adjusting the z control (screw on the goniometer just below the sample holder).

-Bring the tilt mechanism to 0o.

(Hint: if autofocus is way off, z-alignment is bad. Focus the image with the z-alignment from autofocus (use screw on the goniometer just below the sample stage))

(2)Pivot point X and Y

-Move to center of sample (i.e., any hole or away from the sample).

-Press PIVOT PT X soft key in ALGN.

-Condense beam.

-Use MULTIFUNCTION knobs to bring two circles together.

-Press PIVOT PT Y soft key in ALGN.

-Condense beam.

-Use MULTIFUNCTION knobs to bring two circles together.

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Philips CM-20 manual Alignment of Imaging System, Voltage Center Alignment
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CM-20 specifications

The Philips CM-20 is a dynamic and innovative multimedia speaker system that enhances the audio experience for users yearning for rich sound quality and versatile functionality. Designed with modern aesthetics and cutting-edge technology, the CM-20 is ideal for home entertainment setups, providing user-friendly features that cater to audio enthusiasts and casual listeners alike.

One of the standout features of the Philips CM-20 is its powerful audio output, delivering deep bass and crisp highs. Its advanced speaker design includes well-engineered drivers that ensure a balanced sound profile, making it suitable for various audio genres, from classical to contemporary. The system is equipped with a built-in amplifier, which optimizes performance and ensures minimal distortion even at higher volumes.

Connectivity is a key aspect of the CM-20. It boasts multiple input options, including Bluetooth, USB, and RCA. This allows users to easily connect a variety of devices, such as smartphones, tablets, and computers, enabling seamless streaming of music. The Bluetooth capability is particularly noteworthy, as it permits users to enjoy wireless audio playback without the hassle of tangled cords.

The user-friendly interface of the Philips CM-20 is another highlight. It features intuitive controls that make it easy to adjust volume, bass, and treble settings, allowing users to customize their audio experience to their personal preferences. Additionally, the speaker system includes a remote control for added convenience, enabling users to manage playback from a distance.

In terms of build quality, the CM-20 combines durability with sleek design. Its compact size makes it easy to integrate into any living space, while the aesthetically pleasing finish enhances the overall décor. The system is built to last, providing a robust solution for long-term use.

Another key characteristic of the Philips CM-20 is its energy efficiency. The speaker system is designed to minimize power consumption without compromising performance, making it an eco-friendly choice for audio lovers.

In summary, the Philips CM-20 stands out with its powerful audio capabilities, versatile connectivity options, user-friendly controls, and appealing design. It represents a great addition to any home audio setup, providing an enjoyable listening experience suitable for any occasion. Whether for casual use or dedicated listening sessions, the CM-20 is engineered to impress.
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