30A Manual.pdf

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MODEL 30A SERIES

LOW-PASS ELLIPTICAL

PLUG-IN FILTER MODULES

MODEL 30A-1:

1Hz to 99kHz

MODEL 30A-2: 0.1Hz to 9.9kHz

MODEL 30A-3: 0.01Hz to 990Hz

OPERATING MANUAL

FILTER MODULES

MODEL__________

S/N___________

MODEL___________

S/N__________

MAINFRAME

MODEL__________ S/N___________

MICROPROCESSOR

MODEL_________

S/N__________

255 Bodwell Street, Avon, MA 02322-1161

Tel: (508) 580-1660; Fax: (508) 583-8989

E-mail: krohnhite@aol.com; Web: www.krohn-hite.com

Model 30A

Table of Contents

TABLE OF CONTENTS

1.0

GENERAL DESCRIPTION ...............................................................................1-1

1.1

1.2

INTRODUCTION .......................................................................................................1-1

SPECIFICATIONS .....................................................................................................1-1

2.0

OPERATION....................................................................................................2-1

2.1

2.2

2.3

2.4

2.5

INTRODUCTION .......................................................................................................2-1

TURN-ON PROCEDURE ..........................................................................................2-1

SELF-TEST FEATURE..............................................................................................2-1

FRONT PANEL CONTROLS and DISPLAY .............................................................2-2

FILTER CHARACTERISTICS ...................................................................................2-3

2.5.1 Introduction ....................................................................................................2-3

2.5.2 Normalized Ripple Response ........................................................................2-3

VARIABLE BANDPASS and BAND REJECT OPERATION ....................................2-3

TRANSIENT RESPONSE .........................................................................................2-4

PHASE RESPONSE..................................................................................................2-5

DELAY TIME..............................................................................................................2-6

GROUP DELAY .........................................................................................................2-6

2.6

2.7

2.8

2.9

2.10

3.0

IEEE-488 STD (GPIB) PROGRAMMING ...........................................................3-1

3.1

3.2

3.3

3.4

INTRODUCTION .......................................................................................................3-1

FILTER TYPE ............................................................................................................3-1

MODE OF OPERATION............................................................................................3-1

DEVICE CLEAR .........................................................................................................3-1

4.0

INCOMING ACCEPTANCE ..............................................................................4-1

4.1

4.2

4.3

4.4

INTRODUCTION .......................................................................................................4-1

TEST EQUIPMENT REQUIRED...............................................................................4-1

PRE-FILTER, POST-FILTER AND UNITY GAIN ACCURACY ................................4-1

PASSBAND GAIN AND DISTORTION TESTS ........................................................4-2

4.4.1 Low Bands Ripple Response ........................................................................4-2

4.4.2 High Band Ripple Response (Model 30A-1) .................................................4-2

4.4.3 High Band Ripple Response (Model 30A-2) .................................................4-3

4.4.4 High Band Ripple Response (Model 30A-3) .................................................4-3

STOPBAND ATTENUATION ....................................................................................4-3

4.5.1 Band 1 ............................................................................................................4-3

4.5.2 Band 2 ............................................................................................................4-3

4.5.3 Band 3 ............................................................................................................4-3

4.5.4 Band 4 ............................................................................................................4-4

CUTOFF FREQUENCY.............................................................................................4-4

NOISE MEASUREMENTS ........................................................................................4-4

4.5

4.6

4.7

Model 30A

Table of Contents

Model 30A Plug-In Filter Module

Model 30A

Section 1 – General Description

SECTION 1

GENERAL DESCRIPTION

1.1

INTRODUCTION

The Model 30A Series are low-pass, 7-pole, 6-zero elliptical plug-in filters providing

115dB/octave roll-off, a minimum stopband attenuation of >80dB, and a typical passband ripple

of 0.22dB peak-to-peak. The Model 30A-1 covers the range from 1Hz to 99kHz. The Model

30A-2 operates from 0.1Hz to 9.9kHz and from 0.01Hz to 990Hz in the Model 30A-3.

With its 115dB/octave rolloff rate, the Model 30A provides a much narrower transition region

than an 8-pole Butterworth, and much less passband attenuation near cutoff. The transition

region from –3dB to –85dB is 64% of f

(cutoff), compared to 242% for the 8-pole Butterworth.

From –0.3dB to –85.6dB, it becomes 70% of f

compared to 404%. This permits lower sampling

rates and wider bandwidths, resulting in lower total system costs.

The Model 30A Series is part of an ever expanding line of plug-in filter cards for use in the

Model 3905C and 3916C Mainframes, which accommodates 5 to 16 filter cards respectively.

1.2

SPECIFICATIONS

FILTER CHARACTERISTICS

Function:

Low-pass filter, voltage gain amplifier.

Type:

7-pole, 6-zero elliptical.

Frequency Range f

Model 30A-1: 1Hz to 99kHz.

Model 30A-2: 0.1Hz to 9.9kHz.

Model 30A-3: 0.01Hz to 990Hz.

Resolution:

Model 30A-1

Band

Model 30A-2

Band

Model 30A-3

Band

Frequency

1Hz to 99Hz

100Hz to 990Hz

1kHz to 9.9kHz

10kHz to 99kHz

Resolution

1Hz

10Hz

100Hz

1000Hz

Frequency

0.1Hz to 9.9Hz

10Hz to 99Hz

100Hz to 990Hz

1kHz to 9.9kHz

Resolution

0.1Hz

1Hz

10Hz

100Hz

Frequency

0.01Hz to 0.99Hz

1Hz to 99Hz

100Hz to 99Hz

100Hz to 990Hz

Resolution

0.01Hz

0.1Hz

1Hz

10Hz

1-1

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