MicroTim™ Precision Digital Barometric Altimeter / Barometer / VSI
Contents
1. 7 2 1 VSI Units The unit selections available in altimeter mode are also available in vsi mode The default is feet per minute You Jar may toggle to metric meters per minute by holding the co key for 5 seconds then releasing 7 2 2 VSI Deadband MicroTim will display as zero any climb sink rate less than 30 feet per minute 7 3 Exiting VSI Mode Normal altimeter operation is restored by executing a NORMAL system reset by initiating a reset and NOT touching any keys until it is complete See section 1 3 Restoring Factory Default Settings 8 Vertical Accumulator Mode MicroTim is primarily for altitude indication However it can also be configured to act as a vertical accumulator This logs the total vertical distances traversed by the unit since last zeroed Like barometer and vsi modes accumulator mode is activated by executing a special system reset 8 1 Activating Accumulator Mode To activate accumulator mode i ZERO 5 Begin a system reset by holding down the key for 5 seconds then releasing the key The system reset will begin when the key is released During the reset MicroTim will show the serial number sern and firmware revision number frn followed by a screen test starting with 0000 and ending with 9999 TALT 6 At any time during the screen test before 9999 appears press and hold the key If this key is being HELD DOWN as the reset cycle completes i e showing 9999 on the screen then Mi2. MicroTim To toggle between slow fast sampling rates hold J for 5 seconds and release FAST or SLO will display showing the new rate Be aware that in slow mode brief changes in altitude can be missed For example a 10 foot vertical dip lasting 10 seconds may not register on MicroTim Fast mode the default has a better chance of detecting this 20 feet in vertical distance traveled 8 3 Exiting Accumulator Mode Normal altimeter operation is restored by executing a NORMAL system reset by initiating a reset and NOT touching any keys until it is complete See section 1 3 Restoring Factory Default Settings 13 9 MicroTim Messages MicroTim can display the following messages MESSAGE EXPLANATION rger Range Error Out of the calibrated range of 2000 to 19999 feet ader Internal hardware failure Unit requires service feet Units have just been changed to feet inHg metr Units have just been changed to meters kPa ftmb Units have just been changed to feet mbar bp MicroTim has just been switched to barometric pressure mode as opposed to field elevation mode fld MicroTim has just been switched to field elevation mode frn Firmware revision number i e software version follows Upon reset MicroTim displays frn then firmware revision number sern Electronic serial number follows this message Upon reset MicroTim displays sern then the u
3. have 15 Question What does the warranty cover Answer MicroTim is warranted for a period of one year from date of purchase against defects in workmanship The following items are NOT covered 1 Bleeding LCD displays black spots This is a direct effect of being overly shocked dropping from a significant distance onto concrete for example or being subjected to excessive cold hot temperatures 2 Being subjected to temperatures out of the specification An internal temperature sensor logs the maximum minimum temperatures ever encountered by the unit The 20C to 85C range must be maintained 3 Stripped holes due to over tightening screws Gently tighten until snug They will not vibrate loose 4 Cosmetic damage like scratching the cover or using sharp objects or fingernails to push the 3 buttons Faceplates can however be replaced for a charge Email repairs 2microtim com for details 16 17
4. 0 seconds then re insert 7 Replace cover and the two screws DO NOT OVER TIGHTEN THE SCREWS These screws will not vibrate loose and gentle tightening is all that is required MicroTim is not warranted for stripped holes Also the lid is recessed to clear the battery and fits correctly only one way Observe the recess in the cover Appendix A Frequently Asked Questions Question When in ftmb or metr modes I cannot reach the exact number I am trying for Why not Answer MicroTim is changing the barometric pressure internally by 0 01 inHg 9 3 feet then converting to mbar or kPa Pick the number closest to the setting you are trying for Question This is a barometric altimeter How does the sensor access the local pressure Answer MicroTim has an unsealed rear cover which allows the internals to equalize with external air pressure In addition a small hole in the cover is present to ensure equalization The rear cover and this small hole should never be sealed or the accuracy of the unit will be severely affected Question I replaced the battery and the unit seems frozen What now Answer The unit has not booted correctly Remove the battery for one minute then reinsert Within 10 seconds the unit should be running normally Repeat if necessary Question What if I have a problem I cannot seem to solve Answer Go to http www microtim com or email support microtim com and we will answer any questions you
5. 52 MicroTim is 652 units BELOW ground level 3 Keypad Function Details There are three keys on MicroTim not six Each key has 2 functions 1 A primary function upper text activated by quick press release 2 A secondary function lower text activated by holding the key down for 5 seconds then releasing Primary Key Functions press release Raise barometric pressure Lower barometric pressure Zero AGL Secondary Key Functions hold down 5 seconds then release Toggle display mode hold 5 sec Toggle display units hold 5 sec Restore defaults hold 5 sec 4 Setting the Barometric Pressure MicroTim contains a barometric pressure setting which allows the user to enter the current local barometric pressure to correct the altitude readings for weather changes Pat Laut To VIEW the current barometer setting press either of the alt keys co once MicroTim will display the barometer setting for 5 seconds TaT ALT To CHANGE the barometer setting repeatedly press release the alt keys EEA co until the desired barometer setting is achieved When viewing altitude in metr meters kPa mode the barometric pressure reads in units of kPa and 101 32 kPa will display as 10132 When viewing in ftmb mode the barometric pressure reads in units of mbar millibars Note that since the decimal point is not shown mbar units will display the same as kPa units For example 1013 2 mbar will read a
6. Accumulator Sampling Rate 13 8 3 Exiting Accumulator Mode ee 13 9 Micro Tim Messages ansehe is 14 10 Changing the Battery ooooocccnoncccnocccnoncccnnonanononan nns 14 Appendix A Frequently Asked Questions eee 15 WARNING DO NOT OVER TIGHTEN THE SCREWS when changing the battery Warranty does not cover stripped screw holes The battery cover is recessed to clear the battery and only fits correctly one way Observe the recessed battery cover when replacing the battery Serial Number Firmware Revision Number Checked MicroTim is a precise durable low power digital barometric altimeter Here are some of the major features of the MicroTim altimeter e Lightweight and portable Low power consumption Runs for months on a single replaceable AAA penlight battery e Low battery warning Typically several days warning Displays in units of meters kPa or feet inHg or feet mbar e Barometric pressure adjustable Factory calibrated e Durable Moisture and vibration resistant e Can function as a high precision barometer e Can function as a VSI Vertical Speed Indicator Can function as a Vertical Accumulator total vertical distance traversed 1 General Operation The sealevel altitude ASL is displayed when no key activity has occurred in the past 5 seconds The barometric pressure setting corrects these altitude readings for weathe
7. MicroT im Precision Digital Barometric Altimeter Barometer VSI User Manual Document Revision 4 0 Firmware Version 2 2 Table of Contents 1 General Operation ausser send 6 1 1 Altitude Display MOdeS ooooncccnocccooccconcnannninanonnnonns 6 Ti Innerer 6 13 Restoring Factory Default Settings 6 2 Display Mode ExampleS ooooonnnccnnoncccnonccinonnnonnnccnnnnnoos 7 2 1 ASL Display Example 7 2 2 AGL Display Example oooonnonanononacinnnnnnnnocn nncconos 7 3 Keypad Function Details cunas 8 4 Setting the Barometric Pressure 8 5 Pield Blevation Moden sans ten 9 6 Barometer Mode u ua it 10 6 1 Activating Barometer Mode u ee 10 6 2 Calibrating the Barometer 10 6 2 1 Calibrating Barometer Mode by Known Elevation 10 6 2 2 Calibrating by Known Barometric Pressure 10 6 3 Using the Bar meler asien 10 6 3 1 Barometer Units unvatacoaarandints 11 6 4 Exiting Barometer Mode 11 7 SL MOS Ree 22er 11 7 1 Activating VSI Mode citant 11 Ta Using VS Lia 11 7 2 1 VST Unai anaa 12 1 22 VSLDeadband suit 12 1 3 Exiting VST Mode ae 12 8 Vertical Accumulator Mode 2022uersner sense nenn 12 8 1 Activating Accumulator Mode uu cesses 12 82 Using the Vertical Accumulator 12 8 2 1 Zeroing the Accumulator eeeeeeeeeeee 13 8 2 2 Accumulator Unis ec et 13 8 2 3 Accumulator Deadband 13 8 2 4
8. croTim will enter accumulator mode Do not release the key until ACC appears on the display MicroTim is now in tau accumulator mode and you may release the HEN key 8 2 Using the Vertical Accumulator In accumulator mode MicroTim displays 3 distances in a cyclic fashion all in TENS of units feet or meters 12 1 Vertical distance CLIMBED 2 Vertical distance DESCENDED 3 The sum of 1 and 2 total vertical distance no sign Some examples of accumulator readings are Accumulator Meaning Reading 0300 MicroTim has CLIMBED 3 000 units since last zeroing 1288 MicroTim has DESCENDED 12 880 units since last zeroing 1588 Total vertical units traveled are 15 880 units i e 3 000 12 880 15 880 8 2 1 Zeroing the Accumulator ZERO Pressing the key sets all 3 accumulator quantities to zero 8 2 2 Accumulator Units The unit selections available in altimeter mode are also available in accumulator mode The default is feet You may toggle to metric meters by holding the co key for 5 seconds then releasing 8 2 3 Accumulator Deadband After each reading MicroTim will ignore any changes in altitude of 2 feet or less 8 2 4 Accumulator Sampling Rate MicroTim accommodates two sampling rates FAST sampling rate default and a slower sampling rate for slower vertical movement SLO where the accumulator deadband may be eae slow climbs descents to be ignored by
9. essure in inches of mercury 7 ZERO Holding down the reset key for 5 seconds then releasing will restore these factory default settings During a system reset MicroTim will display 1 The unique electronic serial number sern followed by the serial number 2 The firmware version frn followed by the firmware version 3 A screen test cycling from 0000 to 9999 4 The defaulted barometric pressure 2992 then MicroTim resumes normal operation with the default settings 2 Display Mode Examples 2 1 ASL Display Example This is the altitude above mean sea level also referred to as MSL The ASL altitude appears as an UNSIGNED number In the case of being BELOW sea level an ARROW will appear in the upper left corner of the display to indicate an altitude below sealevel Examples of ASL readings ASL Meaning Reading 2368 MicroTim is 2368 units ABOVE mean sea level MicroTim is 421 units BELOW 0421 mean sea level 2 2 AGL Display Example This is the altitude above a user selected ground level The AGL altitude always appears with a or sign This is what distinguishes AGL from the ASL altitude ASL altitude never appears with a sign uses an arrow for negative ASL Zero the AGL at any altitude with a ZERO press release of the zero key E Examples of AGL readings AGL Meaning Reading 1368 MicroTim is 1368 units ABOVE ground level 06
10. m is at you can calibrate the barometer by entering this elevation Press the FALT co keys until the correct elevation appears on the screen The elevation will increment in 9 3 foot steps equivalent to 0 01 inHg at sealevel Select the elevation closest to your true elevation After no keys have been pressed for 5 seconds MicroTim will stop displaying the reference elevation and show the correct barometric pressure 6 2 2 Calibrating by Known Barometric Pressure Par Baur Note that alternatively you may simply know the current barometric pressure in your area and use the EXA co keys to force MicroTim to this value From then on MicroTim will display the correct barometric pressure 6 3 Using the Barometer In barometer mode MicroTim displays the barometric pressure constantly MicroTim updates the reading once per minute and NEVER goes into sleep mode 10 6 3 1 Barometer Units The three unit combinations available in altimeter mode are also available in barometer mode The default is inches of mercury for pressure and feet for reference elevation inHg feet You may toggle through metric kPa meters Jarr and mixed mbar feet by holding the co key for 5 seconds then releasing 6 4 Exiting Barometer Mode Normal altimeter operation is restored by executing a NORMAL system reset by initiating a reset and NOT touching any keys until it is complete See section 1 3 Restoring Factory Default Settings 7 VSI Mode MicroTim i
11. nique electronic serial number of this unit agl MicroTim has just been configured to display only AGL altitude asl MicroTim has just been configured to display only ASL altitude both MicroTim has just been configured to display both AGL and ASL altitudes baro MicroTim is now in barometer mode VSI MicroTim is now in VSI mode ACC MicroTim is now in vertical accumulator mode FAST Accumulator is now in FAST sampling mode SLOW Accumulator is now in SLOW sampling mode batt Low Battery Install a fresh high grade battery 10 Changing the Battery The MicroTim digital is a low power device which will operate for months on a single high end for example Energizer E2 AAA size penlight battery A high quality alkaline battery is obviously preferable in terms of battery life Do not use rechargeable batteries as these types of batteries self discharge relatively quickly To change the battery 1 Place the unit on a soft cloth or hold the unit to prevent scratching the faceplate while changing the battery 2 Remove the 2 Philips screws by turning them counter clockwise 14 3 Gently remove battery by pulling the ribbon upward 4 Re position the ribbon under a fresh battery observing the correct polarity 5 If no numbers appear after 10 seconds the battery may not be contacting correctly Rotate the battery inside the unit slightly 6 If the unit is not powering up correctly remove the battery for 6
12. r changes and is set by single Pat LAT press releases of the altitude keys MEA co The default barometer setting is 2992 29 92 inHg 1 1 Altitude Display Modes MicroTim can be configured to display e ASL default Unsigned number Arrow indicates negative readings below sealevel e AGL Altitude above Ground Level Sign is displayed to show altitude above or below the location MicroTim was last zeroed at e Both AGL ASL alternately every 2 seconds To change the display mode hold the display key MEN for 5 seconds then release MicroTim will then flash the selected display mode ASL AGL BOTH for 5 seconds 1 2 Units MicroTim displays altitude in feet and barometric pressure in inches of mercury by default Three sets of units are available 1 Altitude in feet barometric pressure in inches of mercury default 2 Altitude in meters barometric pressure in kPa 3 Altitude in feet barometric pressure in millibars Jar To change units hold the units key co for 5 seconds then release MicroTim will then flash the selected unit pairing FEET METR FTMB for 5 seconds After 20 minutes of inactivity no key activity or significant altitude changes MicroTim goes into a battery saving sleep mode which is indicated by the message slep To restore normal operation press any key 1 3 Restoring Factory Default Settings By default MicroTim is in altimeter mode displaying ASL in feet and barometric pr
13. ress Note Upon reset MicroTim defaults to bp mode 6 Barometer Mode MicroTim is primarily for altitude indication However it can also be configured to act as a high precision barometer when it remains at a constant elevation Barometer mode is activated by executing a special system reset 6 1 Activating Barometer Mode To activate barometer mode i ZERO 1 Begin a system reset by holding down the key for 5 seconds then releasing the key The system reset will begin when the key is released During the reset MicroTim will show the serial number sern and firmware revision number frn followed by a screen test starting with 0000 and ending with 9999 ZERO 2 At any time during the screen test before 9999 appears press and hold the key If this key is being HELD DOWN as the reset cycle completes i e showing 9999 on the screen then MicroTim will enter barometer mode Do not release the key until baro appears on the display MicroTim is now in barometer 7 ZERO mode and you may release the key 6 2 Calibrating the Barometer When set to barometer mode MicroTim assumes a barometric pressure of 29 92 inches of mercury This reading needs to be calibrated to your elevation Once it has been calibrated the barometer will read correctly always unless MicroTim is moved to another elevation 6 2 1 Calibrating Barometer Mode by Known Elevation aut If you know the elevation MicroTi
14. s 10132 When viewing in feet mode the barometric pressure displays in units of inHg and 29 92 inHg will display as 2992 5 Field Elevation Mode Many users will not have access to the current barometric pressure for their area but will know their current starting elevation Trial and error finding the correct barometric pressure setting to produce this known starting elevation can be tedious To ignore barometric pressure altogether and dial in a known starting elevation place MicroTim in field elevation mode To toggle MicroTim between field elevation fld and barometric pressure bp modes do a quick press release each of the keys in the following sequence ety Sar Ey Lact zero ia TaT aa TALT ZERO msr ose ose That is up down up down zero up down up down zero Then fld or bp will appear on the screen verifying that the mode has been successfully changed Repeat this sequence until desired mode appears Note To prevent accidental activation of the bp fld mode selection MicroTim ignores the sequence if more than 2 seconds elapses between any of the keypresses in the sequence act LAT Once field elevation mode is achieved pressing the alt keys MGM co now immediately displays the newly adjusted altitude In this mode MicroTim does not display the barometric pressure at all but still adjusts the altitude by 0 01 rar ALT inHg 0 339 mbar or about 9 3 feet with each HEN or co keyp
15. s primarily for altitude indication However it can also be configured to act as a VSI Vertical Speed Indicator Like barometer mode vsi mode is activated by executing a special system reset 7 1 Activating VSI Mode To activate VSI mode i ZERO 3 Begin a system reset by holding down the key for 5 seconds then releasing the key The system reset will begin when the key is released During the reset MicroTim will show the serial number sern and firmware revision number frn followed by a screen test starting with 0000 and ending with 9999 Y art 4 At any time during the screen test before 9999 appears press and hold the co key If this key is being HELD DOWN as the reset cycle completes i e showing 9999 on the screen then MicroTim will enter vsi mode Do not release the key until VSP appears on the display MicroTim is now in vsi mode and you SALT may release the co key 7 2 Using VSI In vsi mode MicroTim displays your vertical speed in units per minute feet per minute by default A sign indicates climb and a sign indicates sink Some examples of VSI readings are VSI Meaning Reading 0160 MicroTim is CLIMBING at an average rate of 160 units per minute 11 1150 MicroTim is DESCENDING at an average rate of 1150 units per minute where units are feet by default but may be set to meters by changing the units see section 7 2 1
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