Axis 670 Manual de Instruções descarregar pdf (Página 54)

6.2.2 Notch Filter Tuning Procedure

The 6740-XX Notch Filter Module (NFM) is designed to be inserted into J5 of the 670 servo

amp.

The selection ofthe proper

NFM

is described below, along with tuning information.

Overview

This procedure indicates how to:

1) Determine the

1**

torsional resonant

frequency

(Fr) of a scanner and mirror load

combination

2) Select the proper 6740-xx Notch Filter Module (NFM)

3) Insert and Tune the NFM to the Fr

This procedure assumes the following:

properly heat-sinked, working 670 board is hooked up to a power supply with

adequate current capability

- A working scanner with mirror load

in an X-Y mount or test clamp similar to what

the end use would provide, and connected to the 670 board

- The proper test equipment for normal system tuning is also set up and ready

- The 670 schematic and outline drawings are in front of you.

- The 6740 Notch Filter Module schematic is in front of you

Equipment Needed:

- Oscilloscope (dual trace, minimum 60Mhz BW)

- Frequency counter

* 670 board GND connection

points:

TP2, W7.2

6.2.2.1

Determining Fr;

a) Set signal generator to Ikhz sine wave, lowest amplitude. Note that we are assuming

that Fr will be above IKhz. Connect a

frequency

counter to the output ofthe signal

generator with a

"T"

connector.

b) Without the NFM inserted into J5 (servo loop is

broken),

connect the signal generator

TP6.

Ground can be obtained on TP2 or W7.2.

c) Observe position (TP

and current (TP3) with scope.

d) Tum on power and signal generator.

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Axis 670 Manual de Instruções Página 54

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