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Krohn-Hite 3382 Operating Manual

Tunable active filter
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Model 3380 Series
Tunable Active Filter
Op er at ing Man ual
0.1Hz to 200kHz
48dB/Oc tave Slope
Butterworth and Bessel Re sponse
Low-Pass, High-Pass, Band-Pass, Band-Re ject
Model 3381 - Sin gle Chan nel
Model 3382 - Dual Chan nel
Model 3384 - Four Chan nel

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Summary of Contents for Krohn-Hite 3382

  • Page 1 Model 3380 Series Tunable Active Filter Op er at ing Man ual 0.1Hz to 200kHz 48dB/Oc tave Slope Butterworth and Bessel Re sponse Low-Pass, High-Pass, Band-Pass, Band-Re ject Model 3381 - Sin gle Chan nel Model 3382 - Dual Chan nel...
  • Page 3 2004 Krohn-Hite Corporation. All rights reserved. Contents of this publication may not be reproduced in any form without the written permission of Krohn-Hite Corporation. Printed in USA - 9/2004. 15 Jonathan Drive, Unit 4, Brockton, MA 02301-5566 - Made in U.S.A.
  • Page 4 No other war ranty is ex pressed or im plied. Krohn-Hite Cor po ra tion re serves the right to make de sign changes at any time with out in cur ring any ob li ga tion to in cor- po rate these changes in in stru ments pre vi ously pur chased.

  • Page 5: Table Of Contents

    Model 3380 Se ries Ta ble of Con tents Ta ble of Con tents 1.0 GEN ERAL DE SCRIP TION · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 1-1 1.1 IN TRO DUC TION ·...
  • Page 6 Ta ble of Con tents Model 3380 Se ries Ta ble of Con tents (Con tinued) 2.5 REAR PANEL DC LEVEL AD JUST MENTS · · · · · · · · · · · · · · · · · · · · · · · · · · · 2-3 2.5.1 DC Level Adj (Rear Panel) Out ·...
  • Page 7 Model 3380 Se ries Ta ble of Con tents This page in ten tion ally left blank.
  • Page 8 Ta ble of Con tents Model 3380 Se ries...

  • Page 9: General Description

    IN TRO DUC TION The Krohn-Hite Model 3380 Fil ter Se ries (3381, 3382 and 3384) are one, two or four chan nel fil ters pro vid ing a tun able fre quency range from 0.1Hz to 200kHz; and with the 002 op tion, the range is ex tended to 0.005Hz. The fre quency re - sponse char ac ter is tic is selectable to ei ther max i mally flat (Butterworth) for clean fil ter ing in the fre quency do main, or lin ear phase (Bessel) to pro vide su pe rior fil ter ing of pulse or com plex sig nals.

  • Page 10: Gen Eral

    Section 1 - General Description Model 3380 Series Passband Gain: ±0.2dB. High-Pass Bandwidth (0dB Gain): >2MHz. Stopband Attenuation: >100dB. Maximum Input: ±10V peak at 0dB gain, reduced in proportion to gain setting. Pre-Filter Gain: 0dB, 10dB, 20dB, 30dB, 40dB, 50dB, ±0.2dB.
  • Page 11 Model 3380 Series Section 1 - General Description Rack Mount Kit: Part No. RK-314, permits installation of the Model 3380 Series into a standard 19" rack spacing. Extended 1 Year Warranty: Part No. EX3380. Specifications apply at 25°C, ±5°C.
  • Page 12 Section 1 - General Description Model 3380 Series This page in ten tion ally left blank.

  • Page 13: Operation

    Model 3380 Series Section 2 - Operation SECTION 2 OPERATION IN TRO DUC TION The Model 3381, 3382 and 3384 Fil ters are one, two or four chan nel fil ters re spec tively, pro vid ing a tun able fre quency range of 0.1Hz to 200kHz (0.005Hz with op tion 002).
  • Page 14 Section 2 - Operation Model 3380 Series Model 3382 Filters Note: On early mod els, a 120V/240V switch was pro vided next to the Norm/Low line switch. In put In stall Fuse 120V Norm Volt age 240V Range Model 3381...

  • Page 15: Self Test

    Model 3380 Series Section 2 - Operation SELF TEST When the Model 3380 is turned on, the mi cro pro ces sor per forms a self-test rou tine whereby the en tire RAM and ROM op er a tion is ver i fied. If there is a mal func tion, such as a de fec tive RAM or ROM, the word “bad” will ap pear in the DIS - PLAY fol lowed by a num ber 1 or 2.

  • Page 16: Low-Pass And High-Pass Op Er A Tion - [Mode]

    Section 2 - Operation Model 3380 Series 2.4.1.7 Low-Pass and High-Pass Op er a tion – [MODE] When [MODE] is pressed once, DIS PLAY in di cates the pres ent fil ter type, “h.P.” (high-pass) and “L.P.” (low-pass). When pressed again, the type will change (if the type was “L.P.” , the change will be to “h.P.”).

  • Page 17: Re Call Ing A Fil Ter Setup [Recll]

    Model 3380 Series Section 2 - Operation 2.4.1.13 Re call ing a Fil ter Setup – [RECLL] When [RECLL] is pre ceded by a num ber, it will re call the fil ter set-up which was stored in the mem ory lo ca tion se lected.

  • Page 18: Fil Ter Char Ac Ter Is Tics

    Section 2 - Operation Model 3380 Series FIL TER CHAR AC TER IS TICS 2.6.1 Am pli tude Re sponse Each chan nel of the Model 3380 can op er ate in ei ther the low-pass or high-pass mode at 48dB/oc tave at ten u a tion and pro vide ei ther max i mally flat (Butterworth) am pli tude re sponse or lin ear phase (Bessel) op er a tion.

  • Page 19: Group De Lay

    Model 3380 Series Section 2 - Operation Figure 2.3 Phase Response 2.6.3 Group De lay Group de lay , shown in Fig ure 2.4, on op po site page, is de fined as the de riv a tive of ra dian phase with re spect to ra dian fre quency, which is the slope of the phase curve.

  • Page 20: Tran Sient Re Sponse

    Section 2 - Operation Model 3380 Series 2.6.4 Tran sient Re sponse The nor mal ized re sponse for a unit step volt age ap plied to the in put of the Model 3380 op erat ing in the low-pass mode with both Butterworth and Bessel re sponse is shown in Fig ure 2.5, on page 2-12.

  • Page 21: Incoming Acceptance

    Low Dis tor tion RC Os cil la tor: Krohn-Hite Model 4400A or equiv a lent. RC Os cil la tor: 10Hz to 10MHz, fre quency re sponse of ±0.025dB from 10Hz to 500kHz. Krohn-Hite Model 4300B or equiv a lent.

  • Page 22: Stopband At Ten U A Tion

    Section 3 - Incoming Acceptance Model 3380 Con nect the fre quency coun ter to the os cil la tor, the os cil la tor to the fil ter `+’ in put, and the AC me ter to the fil ter in put. Set the fil ter to butterworth with the `TYPE’...

  • Page 23: Noise Check

    Model 3380 Section 3 - Incoming Acceptance Passive 2MHz Low-Pass Filter Figure 3.2 NOISE CHECK Short the `+’ in puts of both fil ter chan nels and set the chan nel be ing tested to 0dB in put gain, 0dB out put gain, lowpass (mode key), butterworth (type key), DC cou pled (press shift then type, if dis play shows `AC’...
  • Page 24 Section 3 - Incoming Acceptance Model 3380 AC/DC COU PLING CHECK Ap ply a 1Vdc sig nal to the IN PUT of the fil ter. Set the fil ter to low-pass mode with 0dB In put and Out put gain. In the DC COU PLED mode, the OUT PUT of the fil ter should be ap prox i mately 1Vdc and ap prox i mately 0Vdc in the AC COU PLED mode.

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