DAVIS Vantage Pro2 ISS User Manual download pdf (Page 3)

Wireless Vantage Pro2

™

Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.00" to 32.50" Hg, 410 to 820 mm Hg, 540 to 1100 hPa/mb

Elevation Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -999’ to +15,000’ (-600 m to 4570 m) (Note that console screen limits entry of lower

elevation to -999’ when using feet as elevation unit.)

Uncorrected Reading Accuracy. . . . . . . . . . . . . . . . . . . . ±0.03" Hg (±0.8 mm Hg, ±1.0 hPa/mb) (at room temperature)

Sea-Level Reduction Equation Used. . . . . . . . . . . . . . . . United States Method employed prior to use of current “R Factor” method

Equation Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Smithsonian Meteorological Tables

Equation Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.01" Hg (±0.3 mm Hg, ±0.3 hPa/mb)

Elevation Accuracy Required . . . . . . . . . . . . . . . . . . . . . ±10’ (3m) to meet equation accuracy specification

Overall Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.03" Hg (±0.8 mm Hg, ±1.0 hPa/mb)

Trend (change in 3 hours). . . . . . . . . . . . . . . . . . . . . . . . Change 0.06" (2 hPa/mb,1.5 mm Hg) = Rapidly

Change 0.02" (0.7hPa/mb, 0.5 mm Hg)= Slowly

Trend Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 position arrow: Rising (rapidly or slowly), Steady, or Falling (rapidly or slowly)

Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 minute or when console BAR key is pressed twice

Current Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant

Current Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant, 15-min., and Hourly Reading; Daily, Monthly, High and Low

Historical Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-min. and Hourly Reading; Daily, Monthly Highs and Lows

Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Threshold from Current Trend for Storm Clearing (Rising Trend

Low Threshold from Current Trend for Storm Warning (Falling Trend)

Range for Rising and Falling Trend Alarms . . . . . . . . . . . 0.01 to 0.25" Hg (0.1 to 6.4 mm Hg, 0.1 to 8.5 hPa/mb)

Clock

Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 minute

Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Time: 12 or 24 hour format (user-selectable)

Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . US or International format (user-selectable)

Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±8 seconds/month

Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Time: Automatic Daylight Savings Time (for users in North America and Europe

that observe it in AUTO mode, MANUAL setting available for all other areas)

Date: Automatic Leap Year

Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Once per day at set time when active

Dewpoint (calculated)

Resolution and Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1°F or 1°C (user-selectable) °C is converted from °F rounded to the nearest 1°C

Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -105° to +130°F (-76° to +54°C)

Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±3°F (±1.5°C) (typical)

Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 to 12 seconds

Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . World Meteorological Organization (WMO)

Equation Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . WMO Equation with respect to saturation of moist air over water

Variables Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Outside Temperature and Instant Outside Relative Humidity

Current Display Data . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Calculation

Current Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Calculation; Daily, Monthly High and Low

Historical Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . Hourly Calculations; Daily, Monthly Highs and Lows

Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High and Low Threshold from Instant Calculation

Evapotranspiration (calculated, requires solar radiation sensor)

Resolution and Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01" or 0.1 mm (user-selectable)

Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Daily to 32.67" (832.1 mm); Monthly & Yearly to 199.99" (1999.9 mm)

Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Greater of 0.01" (0.25 mm) or ±5%, Reference: side-by-side comparison against a

CIMIS ET weather station

Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 hour

Calculation and Source. . . . . . . . . . . . . . . . . . . . . . . . . . Modified Penman Equation as implemented by CIMIS (California Irrigation

Management Information System) including Net Radiation calculation

Current Display Data . . . . . . . . . . . . . . . . . . . . . . . . . . . Latest Hourly Total Calculation

Current Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . Latest Hourly Total Calculation, Daily, Monthly, Yearly Total

Historical Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . Hourly, Daily, Monthly, Yearly Totals

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DAVIS Vantage Pro2 ISS User Manual Page 3

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