Kestrel DROP FAQ's 0
What does the Refresh button do on the Stats screen?
The Stats page shows the data that is currently stored in the logger on the DROP. Currently you need to disconnect and reconnect to acquire more data, so the Refresh is useful only during an active download. You can hit the Refresh button to populate more Stats as they are in the process of being downloaded to the application.
How do I get additional data onto the Kestrel LiNK(Formerly Kestrel Connect) application after a download?
You must disconnect and then reconnect the DROP to get any additional logged data uploaded into the program. You can do this by closing and re-opening the program as long as Device Power Saving is turned ON.
How do I save battery life on the DROP if the DROP is idle?
Set the logging rate to the max, 12 hours. You could set the data refresh rate to its max, 1 minute, but that will only have an effect when connected to the DROP. Also if you connect to the DROP in colder weather, this will affect battery life more than in warmer temperatures. If possible, warm up the DROP before doing a data upload to Kestrel LiNK to help with battery life.
When I move the DROP to a new location should I rename it?
This is really just personal preference. If the DROP name is related to its location or purpose, then obviously changing the name would be helpful each time.
Can the same DROP be accessed on multiple phones / devices independently?
Yes. Once you make the settings to the DROP (custom name, logging rate, data refresh rate), those settings stay with the DROP itself. This means that all anyone else would have to do is download the Kestrel LiNK(Formerly Kestrel Connect) app from the iTunes App store and connect to the DROP to access.
Can the DROP be accessed by multiple devices simultaneously?
No. Once a device is connected to a DROP, another device will not be able to connect to the DROP until the first connection has been closed.
How do I read the logged data and print it out?
To read the data that has been logging on the DROPs, all you have to do is simply connect to the DROP with your iOS device and the data log will be downloaded. You can tell it’s downloading by looking at the DROP’s name near the top of the screen, as you’ll see a spinning graphic and a percentage that changes over time. Once it has reached 100%, you’ll have to navigate to the Stats screen using the menu at the bottom of the app. There you’ll find an Export Data button at the top which you can use to email the data log to yourself and then print it out.
My DROP is not connecting to Kestrel LiNK (Formerly Kestrel Connect) on my device, what should I do?
1. Make sure you have an device that is compatible with Kestrel LiNK. Compatible devices include: iPhones- iOS 6 installed; iPhone 4s or later. iPad: 3rd generation or later. Android 4.3 and higher. Works with most Android devices with Bluetooth Smart®, including Samsung Galaxy, Nexus 4, Motorola Droid and other recent generation phones and tablets.
2. Make sure Bluetooth is ON on your device.
3. Make sure the battery tab has been pulled and power is on the DROP. It may be necessary to replace the battery if the light doesn't come on when you press the black button on the front of the DROP.
4. If the battery tab is pulled out, try taking the battery itself out of the DROP and reinserting. Also, make sure there isn't any metal or obstructing objects between the DROP and your device.
If none of these steps work, contact our technical support team at firstname.lastname@example.org.
Where can I find my barometric pressure for my DROP D3 on the Kestrel LiNK(Formerly Kestrel Connect) Application?
There is no barometric pressure reading on the DROP D3. Currently only station pressure is provided. Station pressure is the pressure felt at the current location without adjusting for altitude. Station pressure is used in applications like ballistics and auto racing. Typically barometric pressure is only used for weather related phenomenon. Barometric pressure may be added in a future release.
When will the DROP be available for use with Android devices?
Yes, the DROP works with both iOS AND Android Devices. Click here to learn more about Kestrel LiNK for Android.
When setting range, you don't seem to be able to set an end date. Does the DROP just continue logging until you stop it?
Yes.The DROP will always be logging data if the battery is in the unit. There is no way to turn logging off without removing the battery, although you can set the frequency to every 12 hours.
How much data can I store on the DROP?
The D1 can store 13064 data points. The D2 can store 8165 data points.And the D3 can store 6220 data points.
What is a data point? Does 1 measurement constitute a “data point”?
A data point is a collection of all the measurements at a set point in time. In other words, if you record the temperature, humidity and pressure at 12:00 AM, all these numbers will constitute a single data point. Thinking of a data point as a “data set” may help.
How long can I record data before I need to connect to upload the data log? I want to collect data for X amount of days, what should I set the data logging rate at?
Data Points: 13064
Logging every 2 seconds - Fills up after 7.5 hours
Logging every 10 minutes - Fills up after 90.7 days
Logging every 2 hours - Fills up after 544 days
Data Points: 8165
Logging every 2 seconds - Fills up after 4.5 hours
Logging every 10 minutes - Fills up after 56.7 days
Logging every 2 hours - Fills up after 340 days.
Data Points: 6220
Logging every 2 seconds: Fills up after 3.4 hours
Logging every 10 minutes - Fills up after 43.2 days
Logging every 2 hours - Fills up after 259 days
What will happen when my data logger becomes full?
This is dependent on a setting for the DROP in the Manage Data Log section. If you go to Manage->Manage Data Log, you will notice a Wrap Log toggle button. If the Wrap Log toggle button is slid to the right (indicates ON), then the oldest logged data will be overwritten when the data logger is full. If the slide is to the left (indicates OFF), then no more data will be collected when the data logger becomes full.
- Michael Michinok
Tips for taking accurate measurements with your Kestrel Meter 0
"All measurements not available in all units"
For best accuracy when taking temperature measurements you must keep the air moving around the temperature sensor and keep the Kestrel out of prolonged, direct sunlight. If there is a strong breeze, just point the Kestrel into the wind. If there is no wind, swing the Kestrel around in a circle on its lanyard or rapidly wave it back and forth in hand. This ensures that the sensor measures the temperature of the air rather than the temperature of the case. Alternatively, if you have time, allow the Kestrel to rest where you want to measure the air temperature (NOT in your hand or in direct sunlight if there is no wind) until the case temperature equalizes with the air temperature. When equalized, the display will read a constant value. Be aware that this could take a few minutes, particularly if there is no wind.
One reason your Kestrel may not be reading accurate ambient humidity is because of proximity to humidity sources such as your hand, your body or the ground. Avoid covering the large humidity chamber opening on the case rear with your fingers. Keep all fingers below the finger groove and away from the chamber opening. Do not take reading that rely upon humidity with the Kestrel meter lying flat – raise it into the air vertically or stand it on its base and orient it into the wind or air flow. If a high level of accuracy is required for measurements involving humidity, do not hold the unit while taking measurements. Taking readings with the Kestrel in your hand or over your body can raise relative humidity by 5% or more. A Kestrel vane mount will isolate the Kestrel Meter from erroneous humidity influences and keep it oriented into the wind or air flow while taking measurements. Whenever you move your Kestrel Meter into a new environment wait until the primary sensor values have stabilized (Temperature, Humidity, etc.) before taking measurements that rely upon these values. After a large change in environmental condition, this may take 15 minutes or more, with humidity potentially taking the longest. If the humidity sensor housing (located above the rear label) is wet, the Kestrel cannot take an accurate humidity reading. If the sensor does become wet, shake the unit vigorously to remove the water, and then let it dry completely before use. If the sensor comes in contact with salt water, rinse it thoroughly with clean water, then shake it and allow it to dry. As is typical with humidity sensors, it is possible for the humidity sensor in the Kestrel to drift over time as described in the spec sheet. If your unit has a Humidity recalibration function, it can be returned to the factory or used with the Kestrel RH Calibration Kit to recalibrate its humidity readings.
Wind Meter Functions
Wind speed is highly dependent on surrounding obstructions such as buildings, yourself and the ground, with wind speeding up as it flows around and over obstacles and slowing down as it passes behind them. Even in an open area, Wind speed will be slower near the ground so ensure you are taking measurements at an appropriate height for your application. Hold the back of the unit directly into the wind. Holding the unit off-axis by 5° will reduce accuracy by 1%, 10° will reduce accuracy by 2% and 15° will reduce accuracy by 3%. Using a Kestrel Vane Mount will ensure the unit is correctly oriented into the wind and measuring accurate wind speeds. The Kestrel impeller housing can rotate in the unit. For best accuracy, ensure one of the three “arms” of the impeller housing is pointing straight up. The wind speed displayed by the Kestrel Meter is a 3 second rolling average. This allows the unit to provide a value that is more representative of the typical, ambient conditions but not capture peak speeds for instantaneous blasts of air.
The compass in the Kestrel Meter is used for direction, crosswind, headwind/tailwind as well as for capturing various user inputs based on direction. When calibrating and when using the compass, it is important to hold the unit as vertically as possible. Any tilt in angle present when the unit is calibrated or when measurements are taken will negatively impact the accuracy of the compass reading. Many users will inadvertently tilt the Kestrel Meter away from themselves slightly when holding the unit. If a high level of accuracy is required, using a Kestrel vane mount on a leveled tripod for calibration and measurement can eliminate error.
All pressure and altitude measurements are made using the pressure sensor. Some units have a dedicated “Pressure” screen which shows Station Pressure, the raw pressure reading straight from the sensor. The Barometric Pressure measurement (Baro) displays the local Barometric Pressure using the Station Pressure measurement adjusted to the local altitude using the Reference Altitude value input by the user. The Altitude measurement displays the local altitude using the Station Pressure measurement combined with the Reference Baro value input by the user. To obtain an accurate barometric pressure or altitude readings, you must first know EITHER your location’s current barometric pressure OR your current altitude. If the Reference Altitude value is incorrect, the Barometric Pressure reading will also be incorrect. If the Reference Barometric pressure value is incorrect, the Altitude reading will also be incorrect. Because Barometric Pressure and Altitude are each dependent on the alternate reference value remaining constant, Barometric Pressure and Altitude cannot be accurately measured simultaneously. If your unit has a pressure recalibration function, a new Barometric Pressure calibration value may be input. If this value was not taken from a verified source (a local airport or weather station) with the Kestrel being calibrated at the same location as the reference device, pressure related measurements may be incorrect.
When changing environments (such as moving form an air conditioned room to outdoors or removing the unit from your pocket) the unit requires between 8-15 minutes to equilibrate to its surroundings before taking readings. Take measurements at least 3 feet off the ground and in the same wind or air flow conditions as the people you are monitoring. Ensure the Kestrel is oriented into the wind and able to measure the full wind value. A tripod or pole mount and the Kestrel Rotating Vane Mount are ideal for ensuring accurate measurements. Differences in the reflectivity of ground surfaces such as grass or asphalt will impact measurements. Be sure to take measurements in the same solar/radiant heat environment as the people you are monitoring. Unlike best practices for other measurements, WBGT is intended to be taken in direct sunlight. As long as there is occasional wind the Kestrel has software that allows it to maintain an accurate WBGT reading despite being placed in direct sunlight.
Kestrel Professional Meters can calculate air flow through a duct by combining user input information about the size and shape of the duct with the measured air velocity. In addition to reading the instantaneous Air Flow off the main measurement screen, a more accurate result may be obtained by capturing an average air flow on the Min/Ave/Max screen while traversing the duct. Traversing consists of dividing the area of the duct into evenly sized sections and averaging the air flows at the center of all sections. By spending an equal amount of time at each measurement location and quickly moving between measurement locations, the average air flow measurement can provide a more accurate measure of the air flow in the duct. Capturing an average can be particularly helpful when measuring ducts with registers or dimensionally uneven air flow.
(Kestrel 5200 Professional Environmental Meter) Kestrel Professional Meters can calculate a concrete evaporation rate (ACI 308) by combining a user input concrete temperature with measured air temperature, wind speed and relative humidity. Concrete mix temperature is generally measured with a probe or infrared thermometer and should be read at the time of making the evaporation rate measurement After inputting the mix temperature, hold the unit vertically, approximately 20 inches above the surface of the concrete while facing the rear of the unit directly into the wind. To avoid inaccurate Evaporation Rate readings due to thermal loading it is best to shade the Kestrel. (Be sure the source of shade is not obstructing the wind speed measurement.) The ACI recommends taking a 6-10 second average of the evaporation rate to account for fluctuating wind speeds. To measure an average Evaporation Rate, scroll right from the Evaporation Current Measurement Screen to the Min/Ave/Max Screen and press select to manually start and stop a capture.
- Mike M
How to determine if your Kestrel 4 Series Weather Meter has Bluetooth 0M ost 4000 series Kestrel Meters come in two versions, Non-Bluetooth and Bluetooth. Here is a simple way to determine if your meter has Bluetooth. Look at the LCD screen. In the black area surrounding the LCD readout, you will see the Kestrel name and bird on the top right hand side. If your meter has Bluetooth, in the top left corner of the black area there will be a Bluetooth logo . If there is no logo, then the meter you have does not have Bluetooth. If you look at the picture of the three meters together. The meters in the middle and right have Bluetooth.
- Michael Michinok
- Tags: Bluetooth
I don't think my wind speed is reporting correctly. What can I do? 0The Issue could be the impeller or the unit itself.
- Try the following steps to see if the impeller is bad.
- Pop out impeller and then reinsert to see if issue resolved.
- If not, go get a magnet. A refrigerator magnet is fine.
- Pop out the impeller and put Kestrel display screen on Wind.
- Move magnet around impeller area and take note of any wind reading.
- If a small wind reading appears, impeller is defective: replace the impeller with a new impeller from AllKestrel.com.
- If no wind reading appears, unit is defective: send unit into NK for repair.
- Michael Michinok
Altitude / Barometric Pressure Calibration of your Kestrel Meter 0
- Start with a known: Either Current Baro Pressure or Current Altitude
- NK Recommends identifying their current altitude since it is constant
- Enter this reference altitude on the barometric pressure screen.
- For K123s, you would enter this by pressing both outside buttons
- Take note of the updated Barometric Pressure that is shown.
- Use this updated Baro Pressure as your reference pressure on the altitude screen.
- You are now calibrated for your current location / conditions.
- Note: If you change altitude, the barometric pressure will become inaccurate.
- Note: If a weather system moves in, the altitude will become inaccurate.
- What is Sync Alt or Sync Baro?
- Both serve the same function (i.e., if you select Yes, both become Yes)
- If ON, when you exit the Ref Baro or Ref Alt screen, the Kestrel will input the adjusted Baro (or Alt) into the other screen automatically.
- Basically you are saving one step above, but this function only updates once.
- This function is only active when in the reference screens.
- If OFF, customer has to take note of pressure and manually input in.X
- Barometric Pressure – Pressure adjusted to sea level. Need Ref Alt.
- Typically only used in meteorology.
- Used to equate pressures independent of the altitude in order to view pressure changes / storm fronts.
- Station Pressure - Unadjusted pressure. Ref Alt = 0.
- This is used in most practical applications outside of weather:
- Ballistics, air flight, drag racing, etc.
- This is the unadjusted atmospheric pressure felt at that spot.
- Common questions:
- What do I need to set my reference altitude to if I’m using it for shooting?
- For Applied Ballistics and HORUS, the ballistics calculator ALWAYS uses station pressure despite the altitude that is entered.
- If users want station pressure, they should set their reference altitude to ZERO.
- If you want the altitude to display correctly and have station pressure, you will need the current barometric pressure and enter that as the reference barometric pressure. The reference altitude should remain zero. Sync Alt should be OFF.
- I use density altitude for my ballistics program, so what should I set as my reference altitude?
- Density altitude is calculated from Temperature, Humidity and Station Pressure. Somewhat counterintuitive, density altitude is not using the altitude number. The Kestrel will always display the correct density altitude no matter what is entered into as the reference altitude.
- Michael Michinok
When should I recalibrate my Kestrel Meter's sensors? 0
Kestrel Humidity Sensor
- Can drift up to +/- 2% for every 24 months.
- This is independent of whether or not the Kestrel is being used.
- Recommend every 2 years to stay within specs.
Kestrel Wind Sensor (Impeller)
- Drift is < 1% after 100 hours use at 16 MPH.
- This is dependent on usage.
- Recommend purchase new impeller every 2 – 3 years based on usage.
Kestrel Temperature Sensor
- Sensor will have negligible drift during the life of the product.
- Should not need recalibration.
Kestrel Pressure Sensor
- Sensor will have negligible drift during the life of the product.
- Can be recalibrated in the field with a known reference source.
- Contact NK before adjusting System Barometric Pressure however.
- Michael Michinok