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Precision Trading 60 R3.0 User Manual

Page 42

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Operator Manual, Supercharger 60

R3.0

Page 42 of 62

9. CALIBRATION

• NOTE 1: The Charger-Analyzer must be verified (and calibrated if required) at least once

every 12 months, or earlier if deviation from performance is observed. (see first note on
section 7).

• NOTE 2: Perform adjustments only when changing parts and components that require re-

calibration.

• NOTE 3: Perform a Verification of Performance prior to attempting a calibration (see

Section 7, page 25). If the Charger-Analyzer does not perform in accordance to what is
called for in Verification of Performance, then, and only then, proceed with an actual
calibration (adjustments).

9.1 CIRCUIT BOARD ADJUSTMENTS AND CALIBRATION

WARNING! The ground of the electronics circuitry floats on the battery voltage. Make
no connections between the electronics ground and the battery or chassis ground.
Serious damage to the wiring and control circuits will occur if any part of the circuitry
becomes in contact with the chassis while a battery is connected.

NOTE: Most adjustments are performed with no current (no battery required) and
require the use of a voltage source to simulate battery voltages such as the CAL-100
Calibrator or a Power Supply. A battery is required for the adjustments of current output.

9.2 DIGITAL METERS (see [Figure 6]).

NOTE: Digital meters are adjusted by means of multi-turn trimming potentiometers
(trimpots) located on the rear (solder side) of the METERS board.

9.2.1. AMMETER.

9.2.1.1. NOTE 1: Newer versions of this circuit board no longer have a zero

adjustment.

9.2.1.2. NOTE 2: Modified versions of this circuit board may not have a zero

adjustment. (not required).

9.2.1.3. ZERO:

• Adjust the zero with R3 for a reading of 00.0 (the exact point is

when the + - signs alternate).

9.2.1.4. SCALE:

• This meter has a full scale of 199.9 millivolts to read a 100 AMP

shunt with an output of one millivolt per AMP.

• Verify and calibrate using an external ammeter with digital

readout. Adjust R10 at a minimum of 25.0A for a reading within
±0.1A of the reference ammeter.