" Observer Software " / FAQ Results @ seintl.com

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Observer Software / In the Observer software, the needle will read differently than the event recorded in the graph. Is this a problem?

The dwell time (upper right of the screen. fig 1.) is set to a longer value than the Meter Response time next to the analog needle.

The settings are 60 seconds for the dwell time and 1 second for the meter. A quick spurt of five counts would make the needle jump to higher since it is integrated over a brief amount of time. The dwell time would, in this case, integrate over a longer period of time and thus smooth out these statistical variations.

Observer Software / Can I use the Observer Software with the Monitor 4 Family product line?

Yes. However, earlier models of the instruments do not come with the data out standard. Modifications can be made at the time you place your order or by sending your instruments to SE International, Inc. Please contact our support team for pricing.

Observer Software / Why are my instrument and the Observer Software slightly different?

Depending on whether or not you are able to start taking an acquisition with both the Observer Software and the instrument you are using at exactly the same time, the averages will be slightly different.

Observer Software / I have a 64-bit operating system. Why can I not install the Observer Software?

Please download the 64-bit version of the Observer Software installer by CLICKING HERE

Observer Software / Why do I see regular peaks in the Observer Software histogram that are much higher when using an SEI Inspector?

If the average background rate is 65 cpm (1961 counts divided by 30 minutes) there will be, on average, a little over 1 count observed in each one-second interval. In practice, most 1-second intervals will have 0, 1, or 2 counts, as we can't have a non-integer number of counts. Several will have 3, and a handful will have 4.

Since the dwell time is 1 second and the display is cpm, the count from each second is multiplied by 60 to make "instantaneous cpm".

For 1 count, the display will put a point at 60 cpm. For 2 counts, the display will put a point at 120 cpm. For 3 counts, the display will put a point at 180 cpm. For 4 counts, the display will put a point at 240 cpm.

Average those values over a longer period of time and the rate will be around 65 cpm.

Statistics are integrally linked with radiation measurements. This is exacerbated with (1) low count rates and (2) short dwell times. It is recommended that the dwell time be set to something closer to what the SEI Inspector uses, which would be around 30 seconds.

Observer Software / Why can't I see what COM Port was installed for use with my Serial Observer Software?

Windows Update is supposed to install the drivers for it automatically, but we have had instances where it has not. Download the drivers for the cable at the following link: http://www.ftdichip.com/Drivers/CDM/CDM20830_Setup.exe Once the drivers are installed, it should assign a COM Port to the cable when you plug it into the USB port on your computer. The detector does not have to be plugged into the cable for this to happen. If the COM Port number is not displayed in the lower right system tray when you plug in the cable, you can also go to : Control Panel>System>Device Manager>Ports and LPT. This will show you the COM port to connect to your detector.