UVMFR-7 Frequently Asked Questions
4. Instrument Selection
The YESDAS-2 has 32 analog channels, with 8 of them taken up by an MFR-7 or UVMFR, or a 11 channels for a SPUV-10. Assuming you want to monitor bettery voltage, a MFR-7 or UVMFR can accept up to 23 other sensors; a SPUV-10 can handle 20 more. In addition six pulse/digital TTL counter inputs are availabel for anemometers or tipping bucket rain sensors. Adding several pyranometers or IR pyrgeometers is possible and frequently down for users that would like to integrate a MFR into their legacy BSRN-type tracking pyranometer installations.
If you intend to connect the YESDAS-2 up to other instruments, please let us know at time of order so we can advise you.
2. Can I use a different data logger that we already own to run a MFR-7, SPUV, or UVMFR to save some money?
No. YESDAS-2 provides a sophisticated ephemeris algorithm, and thermal control to these instruments, and is therefore tightly coupled to their design. In addition, our multi-platform user software and our optical calibration facilities are dependent on YESDAS-2. Also, YESDAS-2 provides automated Langley analysis and optical depth capability. Keep in mind that the cost of the YESDAS is only a fraction of an MFR-7, UVMFR, or SPUV system, so any cost savings would be minimal.
3. Can I connect a second MFR-7 head to the YESDAS-2 on my MFR/UVMFR system that we already own? What about adding a SPUV?
Yes, but only if it is a downward-looking head (this is our DFR system). You can also connect a SPUV to an MFR/UVMFR. For example, an existing MFR or UVMFR can add on a SPUV as a factory upgrade. Conversely, a SPUV/YESDAS-2 system can have an MFR-7/UVMFR instrument head added by the factory. However, it is not possible to connect two complete shadowband instruments, such as two MFR/UVMFRs, to a single YESDAS.
Yes, the system runs off 12 Vdc. An optional 110/220 Vac supply is available, and we recommend that you use line power as the soalr panel to drive the abtteyr will be quite large.
In the April 1998 issue of the Bulletin of the American Meteorological Society a peer-reviewed paper describes the calibration stability of the US government's UV monitoring network over a four year period. This paper describes the long term calibration stability of approximately fifty YES model UVB-1, MFR-7, and UVMFR-7 instruments during a four year period, and concludes that the stability has been outstanding.
6. What other meteorological sensors (such as temperature, humidity, pressure, wind direction/speed) can be added to the YESDAS-2 connected to an MFR, UVMFR, or SPUV?
Any meteorological sensor with either a voltage current or digital (TTL) pulse type output (but not RS-232) can be added. The YESDAS-2 manual covers this subject in detail.
7. Can the MFR-7 and UVMFR be combined into a single instrument that covers the UV-B through the visible/NIR?
No, (this is why we have separate products). An MFR-7 measures optical signals at a different order of magnitude than does the UVMFR. Hence the internal design of these two instruments is vastly different. Measuring UV requires a much higher gain level to measure the much smaller signals present. A SPUV, however, can be setup to cover from 300 nm all the way to 1040 nm.
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This page was last updated on Monday, September 11, 2006 .