Annex A: Calibrating Voltage And Current; Recalibrating The Receiver For The Optional V/I Sensor - Lemon Rx LM0051 Instructions Manual

Instructions for the Lemon Rx LM0051 and LM0052 Telemetry Receivers

Annex A: Calibrating Voltage and Current

The LM0051/52 comes packaged with a Voltage/Current (V/I) sensor, to which it is specifically calibrated
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at the factory. Any time a receiver is paired with a new V/I sensor, it must be recalibrated.
A voltage sensing wire is included with the receiver, to be used only when a V/I sensor is not present.
The LM0051/52 is calibrated only to the V/I sensor and so must be recalibrated to use the wire.
The LM0051U and LM0052U are not calibrated from the factory and must be calibrated by the user if
either the optional V/I sensor or the included voltage sense wire is to be used.

1. Recalibrating the Receiver for the Optional V/I Sensor

The Lemon Rx V/I sensing module provides both battery voltage and current sensing and must be
matched to a specific receiver. Recalibration of the receiver, as explained below, is needed whenever a
V/I sensor is paired with a receiver for the first time.
If the receiver is purchased as the LM0051U or LM0052U, it is not calibrated and must therefore be
calibrated to a V/I sensor if purchased separately.
An adequate calibration can be performed using a two-cell fully charged LiPo battery and Wattmeter.
Figure A.1 – V/I sensor connected to battery output. Note the two bind plugs. The system is
under load and the Wattmeter is showing 8.10V and 4.09A.
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The calibration procedures presented here apply equally to sensors used with the LM0041 Telemetry Receiver and the
LM0030 Telemetry System.
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