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function. The battery-backed histogram memory provides up to 16,000 channels of non-volatile data storage with optional 32,000 channels. A flash memory provides for non-volatile storage of multiple

spectra. Over 600 512-channel spectra may be stored. time clock is implemented.

A digital version of the Gedcke-Hale3


The digital trapezoidal filter provides 99 rise time (RT) and 16 flat top (FT) choices in the ranges 0.8 S to 20 S and 0.3 S to 2 S respectively. This range of choices is wider than other DSP units to allow precise optimization of detector settings. A digital Automatic Pole Zero circuit4 is provided, along with an optimize function to automatically optimize the flat top tilt as well as Pole Zero across the range of rise time/flat top combinations.

Figure 1 Portable MCA Schematic Block Diagram

Battery and Power Management

The instrument is powered by a single Sony NP-F960 camcorder battery, which will operate for up to 12 hours including supplying the detector power. The battery may be replaced without loss of spectral data and the instrument restarted in seconds. The battery management circuitry is built into the instrument. Any 12V DC external supply will charge the battery and operate the instrument.


The instrument is packaged in an impact-resistant, ABS plastic enclosure, with rubberized overmolding, as shown in Figure 2. The outside overmold is a shock-absorbing, easy grip, stay clean coating. The display and sealed membrane keypad are recessed to protect them if the instrument is dropped. The easy-to-grip enclosure will fit in a box 20 cm x 12.7 cm x 7.7 cm and the weight including battery is <850 gm.

Display and Built-in Analysis functions

The 240 x 160 pixel backlit LCD (Figure 3) provides live spectral display, status information and analysis results. It features full display, display of multiple ROIs and Zoom modes.

Figure 2 The portable MCA in hand- held use

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