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be partially eliminated by the R77 trim on the 670 board. This trim is adjusted so that the AGC

signal changes minimally through a full angular shaft rotation. This signal should not need

adjusting during the normal lifetime ofthe scanner. This adjustment should only be made when

retuning the original scanner or when matching a new scanner to the servo board. Refer to

section 6.0 for details on this procedure.

3.6. Command Input

3.6.1 Input configuration jumper fW4)

(AN) = Analog command signal

(DI) = Digital command signal (from digital input option module)

(SE) = Single ended input

The board input can accept a two or

three

wire connection. For single ended two-wire inputs, the

unused op-amp input is strapped to GND #6 via

W4.

The table below indicates were to connect

signal, ground and

jumpers for

the

particular input configuration:

Input configuration

(AN) Differential

(AN) Non-inverting (SE)

(AN) Inverting (SE)

(DI) Non-inverting

(DI) Inverting

3.6.2. Analoe Input

W4 pin strapping

1-3

1-3,4-6

3-4

3-5,4-6

5-6,3-4

r+)in (-)in GND

J1.3 Jl.l J1.2

J1.3 - J1.2

- Jl.l J1.2

The analog command input signal is applied via Jl. The input voltage range is +/-10V for fiill

angular excursion. Ensure that W4 and the input signal on Jl are connected for the particular

configuration desired

from

the chart

above.

The scanner will move as follows:

input voltage = -lOV position = full CCW angle

input voltage =

position = center

input voltage = +10V position = full CW angle

The coimector kit included with your system has the necessary hardware to build the input

connector

J1.

The connector is Molex #50-57-9404 witii Molex pins #

16-02-0103.

3.63.

Digital Inpot Module

The digital input option employs a 16-bit digital-to-analog converter or DAC (Analog Devices

#AD7846JP). The DAC converts the digital word presented at its input to an analog output

voltage. This voltage is proportional to the 16-bit word. Refer to the applicable Users Guide for

detailed information with regard to the operation ofthe particular digital input option to be used.

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