Kessler Engineering AT-AUTO Manuel utilisateur
AT-AUTO(tm)
Analog Meter Upgrade Kit
Installation Manual
P.O. Box 341543
Beavercreek, Ohio 45434
1 August, 2016
Copyright 2014
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Contents
1 Introduction 1
1.1 General Description and Purpose . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 ToolsRequired .................................. 3
1.3 MeterUpgrade .................................. 4
1.4 MeterCalibration................................. 11
1.4.1 Reading Peak Power . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.4.2 Forward Power Calibration . . . . . . . . . . . . . . . . . . . . . . . . 11
1.4.3 Reflected Power Calibration . . . . . . . . . . . . . . . . . . . . . . . 13
2 Service and Warranty 15
3 User Notes 16
3.1 User Notes - Continued . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
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List of Figures
1.1 AT-AUTO(tm)Meter Upgrade Kit Contents (Front/Rear View) . . . . . . . . 2
1.2 AT-AUTO(tm)after Meter Removal, Showing Peak–Hold PCB . . . . . . . . 5
1.3 AT-AUTO(tm)Peak – Hold PCB, Showing Four Resistors to be Jumpered/Replaced 6
1.4 AT-AUTO(tm)Meter Wiring Harness . . . . . . . . . . . . . . . . . . . . . . 7
1.5 AT-AUTO(tm)Prepared for Meter Install . . . . . . . . . . . . . . . . . . . . 8
1.6 AT-AUTO(tm)Meter Install Complete . . . . . . . . . . . . . . . . . . . . . 9
1.7 Side – view of installed meter and wiring harness . . . . . . . . . . . . . . . 10
1.8 Meter Board Adjustment Locations . . . . . . . . . . . . . . . . . . . . . . . 14
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List of Tables
1.1 AT-AUTO(tm)Meter Upgrade Kit Contents . . . . . . . . . . . . . . . . . . 1
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Introduction
1.1 General Description and Purpose
This meter upgrade kit replaces the AT-AUTO’s(tm)original “dingy colored”, incandescent
backlit meter with an improved-movement LED backlit meter. The original meter suffers
several impairments: The meter scales were congested and the poor choice of power ranges
of either 0 −300W or 0 −3000W limited the meter’s useful resolution. Additionally the
single incandescent lamp was prone to burn-out and often produced a “hot-spot” effect in
the meter.
The new meter provides ranges of 0 −150W and 0 −1500W and the scales have been
sanitized, removing the clutter, improving resolution, and making the meter easier to read.
The improved meter is also backlit with three white LEDs, providing a much more uniform
and pleasing illumination effect.
The AT-AUTO(tm)meter upgrade kit comes with the items listed in Table 1.1 and shown
in Figure 1.1.
Table 1.1: AT-AUTO(tm)Meter Upgrade Kit Contents
Quantity Description
1 LED-Backlit Meter – Printed Circuit Board Assembly
1 Wiring Harness
2 1.25 inch, 4-40 Hex Standoffs
2 0.25 inch, 4-40 Pan–Head Machine Screws
1 2 inch Length of #26 Tinned Copper Wire
4 10Ω Surface Mount Resistors (Optional)
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Figure 1.1: AT-AUTO(tm)Meter Upgrade Kit Contents (Front/Rear View)
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1.2 Tools Required
•#2 Phillips Head Screwdriver
•#2 Right-Angle Drive Phillips Head Screwdriver
•3
16
′′ Wrench or Socket
•Wire Cutters
•Small Needle-Nose Pliers
•Soldering Iron and Solder
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1.3 Meter Upgrade
Synopsis
The AT-AUTO’s(tm)top cover will be removed and the AT-AUTO’s(tm)stock meter, in-
candescent lamp, and holder will be removed and discarded. The Peak–Hold PCB will be
removed, modified, and re-installed. The replacement meter and PCB assembly will then be
installed and meter recalibrated.
Meter & Lamp Removal
The AT-AUTO’s(tm)top cover is held in-place by ten Phillips-head screws: five along the
left and right sides, respectively. Begin by removing these ten screws. Be careful not to loose
the ten plastic washers.
The stock meter and incandescent lamp are held in-place by a tin-plate enclosure, which
is held by two 4-40 hex nuts. Wires from the meter and incandescent lamp plug into the
AT-AUTO(tm)peak – hold PCB (located directly below the meter).
•Locate the meter enclosure, follow the wires from the meter and the lamp and unplug
them from the peak-hold PCB.
•Remove and discard the two hex nuts on either side of the tin-plate meter enclosure.
•Remove and discard the meter, tin-plate shield and the meter lamp.
•Replace any ground lugs removed in the prior steps.
When finished, the vacated meter area should appear as shown in Figure 1.2.
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Figure 1.2: AT-AUTO(tm)after Meter Removal, Showing Peak–Hold PCB
Peak – Hold PCB Modification
The new meter is lower impedance than the stock meter and four resistors on the Peak –
Hold PCB need to be shunted (or replaced).
•unplug the 4-pin connector from the Peak – Hold PCB.
•Remove the four 4-40 machine screws holding the Peak – Hold PCB.
•Turn the Peak – Hold PCB upside-down and locate the four resistors shown in Figure
1.3, and either jumper each of these resistors with the supplied #26 wire, or simply
remove the four circled resistors and replace each one with one of the four, 10Ω surface
mount resistors provided.
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Figure 1.3: AT-AUTO(tm)Peak – Hold PCB, Showing Four Resistors to be
Jumpered/Replaced
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