INSTRUCTION MANUAL Multimeter 7 in 1 - 01 - www.skyrc.
TABLE OF CONTENTS TABLE OF CONTENTS Introduction Features Set Contents Battery Checker Battery Internal Resistance Watt Meter Servo Tester Tacheometer RPM Temperature Thrust Calculator Product Specifications Warranty And Service 03 04 04 06 08 10 12 13 14 15 16 16 CAUTION - Before you start This is a sophisticated unit which will be an important tool in your electric powered model program. Please be careful with it! And please read this instruction manual thoroughly before operating.
INTRODUCTION INTRODUCTION Thank you for the purchase of this SKYRC i-Meter. The SkyRC i-Meter can carry out an enormous range of functions related to Electric Powered models and has been designed with ease of use as a prime objective. This Instruction Manual describes the scope of i-Meter and how to make it work for you.
FEATURES FEATURES 1. Battery Checker 2. Battery Internal Resistance 3. Watt Meter 4. Servo Tester 5. Optical Tachometer 6. Temperature Gauge 7. Thrust Calculator SET CONTENTS 1 2 3 5 4 1. Input Cable 2. Battery Internal Resistance Cable 3. i-Meter www.skyrc.com - 04 - 4. Temperature Probe 5.
FEATURES The Main screen displays all the available functions. The desired function can be accessed by highlighting the desired function by pressing ‘MODE’ button, pressing the ‘ENTER’ button to select that function. B I W S T T T S A N A E A E H E T T T R C M R T T . T V H P U ERY RES ME O T OME ERA ST UP I T E T T C C S E S E U A H T R T R R L ECKER ANCE ER RPM E C... MODE B I W S T T T S A N A E A E H E T T T R C M R T T .
BATTERY CHECKER BATTERY CHECKER The i-Meter allows you to check the individual cell voltages of a 2 cells8 cells Lithium battery. The i-Meter individually measures & diagnoses the cell voltages of the multiple cells, the result is displayed on the large liquid crystal screen. The i-Meter replaces all of the tedious measurement and calculations required in the past to determine the overall voltage of the LiPo, LiFe & LiIon pack and the individual cell voltages that determine the balance of the Lithium pack.
BATTERY CHECKER Connect the balance lead to ‘VOLT PORT’ Press ‘ENTER’ to enter main function screen Press ‘ENTER’ to select BATTERY CHECKER function Press ‘MODE’ to select battery type Press ‘ENTER’ to confirm battery type Battery Type Remaining Amount % Balance Status % L 1 3 5 7 5 6 3 i ) ) ) ) 7 9 . Number of Cells P 3 3 3 0 % % 8 o . . . 8 8 8 6 4 5 7 S 7 2 7 2 2 4 6 8 Serial Pack Voltage 3 ) ) ) ) . 3 3 3 0 1 . . .
BATTERY INTERNAL RESISTANCE The difference is shown graphically between the cell that is showing the highest cell voltage to the cell that is showing the lowest cell voltage (largest cell voltage difference) indicated on the graph. When the cell voltages read equal, the bar extends all the way to the right (O). This indicates that the cells are all balanced to a satisfactory level. When the cells have a difference in voltage the bar shortens and indicates towards the left (X).
BATTERY INTERNAL RESISTANCE Once we have an idea of the internal resistance of a cell we can then use that to determine how efficient our power setup is as well as knowing how much power is being turned to heat in the battery pack and additionally know how much the voltage can potentially drop under load. B I W S T T T S A N A E A E H E T T T R C M R T T . T V H P U ERY RES ME O T OME ERA ST UP I T E T T C C S E S E U A H T R T R R L ECKER ANCE Int.Resietance Res: ER RPM E C...
WATT METER PRECAUTIONS 1. Do not leave a cell connected to the i-Meter for more than five minutes. 2. Be aware that although the i-Meter only takes small samples from the battery pack, the voltage will be reduced. Make sure you check your pack balance. 3. Avoid plugging the cell in reverse polarity. The i-Meter can cope with a reversed connection for a few seconds but it’s still better not to do it in the first place. 4.
WATT METER Effect of gearing and propeller size and shape on power consumption and battery currents Effects of modifications, age and damage on many electrical system components Clever hobbyists will discover new applications to further improve electric model performance. The following are some examples of meter connections. Many other arrangements and uses are possible Testing Loads (e.g.
SERVO TESTER Receiver & Servo Testing Servo 1 Battery Pack C P V W P E C U E O A E n h W R A L T A e a A R K T T K r r T E ( A A ( g g T N C G G W y e T ) E E ) : : METER : 35.11 : 52.11 : 25.13 : 882.3 : 1309. 82Wh 3.2Ah A A V 1W 2W Reciver Servo n... SERVO TESTER Servo testers are very useful for exercising your servos and Electronic Speed Control (ESC) without the need to turn on your transmitter, and you do not even need your receiver.
TACHEOMETER RPM To use the Servo Tester to operate an ESC and motor Connecting a battery to the i-Meter volt port. Another plug connected to the Servo Tester is the plug from the ESC that normally goes to the receiver. Connect the ESC to motor leads. When you connect the battery to the ESC it will power up. It should react the same way does when powered up using the radio gear with the throttle stick in the minimum power position. You can now spin up the motor by turning the servo tester knob.
TEMPERATURE Please DON’T use optical tachometer with fluorescent lighting which will give false readings, such as 3000 or 3600 rpm. The optical RPM sensor will function over a large range of propeller sizes, RPM and lighting conditions. It has even able to measure 40mm diameter model boat props spinning in the air. Experiment with different sensor positions. In some cases, best results may be achieved by testing in the shade.
THRUST CALCULATOR THRUST CALCULATOR The thrust calculator can estimate the thrust of an airplane, there are many variances and some known factors. Lets assume we have an airplane and this is its first flight. We know the size of the propeller and we can do a static full throttle rpm check with a tachometer on the ground. We can now add these known figures into Thrust Calculator. By the fact that you can verify thrust it becomes possible, to estimate the general power of the airplane in advance.
PRODUCT SPECIFICATIONS The static thrust calculation is taken from the October 86 AMA magazine, air density is based on 29.92 in Hg, and propeller pitch is not used in this calculation. Practical tests revealed very little if any change in thrust due to pitch variation at the same RMP. It is believed that this is partly due to any increase in thrust being negated by blade stalling and a more turbulent influx area with increased pitch. This obviously only applies to static conditions, not flying conditions.
