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Krohn-Hite 38 Operating Manual

Plug-in filter card
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Model 38
Plug-In Filter Card
0.03Hz to 1MHz Low-Pass
0.03Hz to 300kHz High-Pass
Operating Manual

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Summary of Contents for Krohn-Hite 38

  • Page 1 Model 38 Plug-In Filter Card 0.03Hz to 1MHz Low-Pass 0.03Hz to 300kHz High-Pass Operating Manual...
  • Page 2 Ser vice and War ranty Krohn-Hite In stru ments are de signed and man u fac tured in ac cor dance with sound en gi neer ing prac tices and should give long trou ble-free ser vice un der nor mal op er at ing con di tions. If your in -...
  • Page 3 Serial No. __________ Operating Manual © Copyright . 2005 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 U.S.A. - 042505. 15 Jon a than Drive, Unit 4, Brockton, MA 02301-5566 U.S.A.

  • Page 5: Table Of Contents

    Model 38 Table of Contents TABLE OF CONTENTS SEC TION 1 - GEN ERAL DE SCRIP TION IN TRO DUC TION · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 1-1 FUNC TION ·...
  • Page 6 Table of Contents Model 38 TABLE OF CONTENTS (CONTINUED) SEC TION 3 - IEEE-488 STD (GPIB) PRO GRAM MING IN TRO DUC TION · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 3-1 PRE LIMI NARY PRO GRAM MING IN FOR MA TION ·...
  • Page 7 Model 38 Table of Contents TABLE OF CONTENTS (CONTINUED) SEC TION 4 - IN COM ING AC CEP TANCE (con tin ued) DIS TOR TION CHECK · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 4-2...

  • Page 8: Section 1 - General Description

    Har monic Dis tor tion: –80dB at 1kHz. pass/high- pass fil ter or an am pli fier pro vid ing gains to 70dB in 0.1dB steps. The 38 will ac cept in put sig nals of ±10V DC Sta bil ity (RTI): Typi cally ±2mV/°C.

  • Page 9: Gen Eral

    Section 1 - General Description Model 38 Wide band Noise (RTI, 2MHz BW de tec tor): 200µVrms min. gain; 25µVrms max. gain. DC Sta bil ity (RTI): Typi cally ±10mV/°C. 1.5 GEN ERAL Cros stalk Be tween Chan nels: –85dB be low full scale with in put source <50 ohms.

  • Page 10: Section 2 - Operation

    Model 38 Section 2 - Operation SECTION 2 OPERATION 2.1 IN TRO DUC TION 2.2.5 Out put Gain (Post Fil ter) The Model 3988 is a plug- in fil ter card cov er ing the fre - Up and down GAIN SET con trols [↑] and [↓] in crease or quency range from 0.03Hz (0.003Hz with op tion 002) to...

  • Page 11: Stor Ing Set- Ups

    In tro duc tion the set- up of all five (Model 3905B) or six teen (Model The Model 38 is an 8- pole fil ter which can be ei ther low- 3916B) cards from that mem ory lo ca tion.

  • Page 12: Am Pli Tude Re Sponse

    2.3.3 Am pli tude Re sponse 2.3.4 Phase Re sponse Each chan nel of the Model 38 can op er ate in ei ther the Phase char ac ter is tics of the Model 38 is shown is Fig ure low- pass or high- pass mode at 48dB/oc tave at tenua tion and 2.2.

  • Page 13: Tran Sient Re Sponse

    1Hz. This will be 2π times the in put of the Model 38 op er at ing in the low- pass mode greater in °/Hz for a cut off of 1 ra dian/sec or –1845°/Hz and with both But ter worth and Bes sel re sponse is shown in Fig - –2211°/Hz re spec tively.

  • Page 14: In Tro Duc Tion

    3.1 IN TRO DUC TION Line Ter mi na tion Char ac ter Se quence The Model 38 re mote pro gram ming in ter face ac cepts both AS CII data com mands and IEEE- 488 stan dard com mands...

  • Page 15: As Cii Data Com Mands

    The Model 38 uses an in ter nal 32 char ac ter buffer for (see Sec tion 3.5.4) com mand proc ess ing. A line may be com posed of...

  • Page 16: Ieee- 488 Stan Dard Com Mands

    Model 38 Section 3 - GPIB Programming or F150 De vice When the de vice clear or H150 Clear com mand is sent, the fol- or HZ150 low ing pa rame ters or K0.15 changes re gard less of their or 1.5E2HZ...

  • Page 17: Par Al Lel Poll Ing

    PPC state. unit re quires serv ice. Ex am ple: If the Model 38 to be con fig ured is unit #5, and Er ror # De scrip tion we want it to re spond with a “1” when an er ror ex ists: In put gain too high or low.

  • Page 18: Uni Line Mes Sages

    The Talker Soft ware al lows an IEEE- 488 (GPIB) con trol ler to in ter ro gate the Model 38 and read back over the bus it’s set tings (gain, fre quency, etc.)Four dif fer ent types of data can be sent over the bus: Nor mally pa rame ter in for ma tion is re turned un less an “OS”, “Q”...

  • Page 19: Pro Gram Ming Ex Am Ple

    Ex am ple 1 – Mi cro soft Quick Ba sic ‘ Mi cro soft (R) Quick Ba sic (tm) pro gram for the Krohn- Hite Model 38‘ ‘ * En ter this pro gram from DOS by typ ing: QB 38 /LQBIB.QLB ‘...
  • Page 20 ‘ 3.6.2 Ex am ple 2 – Bor land Turbo C * Bor land Turbo C Ex am ple Pro gram for the Krohn- Hite Model 38 mul ti chan nel fil ter us ing the NI- 488 * Should work with Mi cro soft C also.
  • Page 21 /* GPIBERR is an er ror func tion that is called when a NI- 488 func tion fails. */ void gpiberr(char *msg); char rd[255]; /* read data buffer */ Gpib Dev,Gpib Board; /* de vice han dles */ void main() { printf(“\nSend ing data to the Krohn- Hite model 38...\n”); printf(“\n”);...
  • Page 22 Section 3 - GPIB Programming * As sign a unique iden ti fier (a ‘ha ndle’) to the K-H 38 and store it in the * vari able Gpib Dev. If Gpib Dev is less than zero, call GPIBERR with an er ror * mes sage.
  • Page 23 (Gpib Dev,"333HZ;20IG;20OG;AC;F", 20L); /* the ‘F’ dis plays the fre quency so when*/ if (ib sta & ERR) gpiberr(“ibwrt Er ror”); /* we read the unit we’ll see the freq */ * Read the K-H 38 again like bef ore. ibrd (Gpib Dev,rd,30L);...
  • Page 24 Model 38 Section 3 - GPIB Programming * The EXIT func tion will ter mi nate this pro gram. *======================================================= ========================== void gpiberr(char *msg) { un signed int i; /* Ta ble of ib sta (in ter face board status word) bit po si tions and cor re spond ing mes sages */ static struct { int bit;...
  • Page 25 Section 3 - GPIB Programming Model 38 { EFSO," EFSO <File sys. er ror>\n"}, { EBUS," EBUS <Com mand er ror>\n"}, { ESTB," ESTB <Status byte lost>\n"}, { ESRQ," ESRQ <SRQ stuck on>\n"}, { ETAB," ETAB <Ta ble Over flow>\n"}};...

  • Page 26: Section 4 - Incoming Acceptance

    The fol low ing pro ce dure should be used to ver ify that the Model 38 fil ter is op er at ing within speci fi ca tions. These checks Change the fil ter to low- pass mode, Bes sel type. Ad just the may be used for in com ing ac cep tance and pe ri odic per form- os cil la tor fre quency for –12.59dB;...

  • Page 27: Noise Check

    With a BNC tee, con nect both the os cil la tor and the AC me - nect it to the model 38’s out put. Set the fil ter to 5kHz. Volt - ter to the fil ter `+’ In put. Set the fil ter to GAIN with the me ter read ing should be 300mV or less.

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