[SAC-HELP] Transfer problem

[Brian Savage]

Dear Blaine,

This error is generated by evalresp.  You should be able to confirm this by running evalresp on your RESP file.

For example
% evalresp CPCT HHE 2010 001 0.001 20 -v -f RESP.ET.CPCT.HHE.2
<< EVALRESP RESPONSE OUTPUT V3.3.3 >>
 WARNING (norm_resp): computed and reported sensitivities differ by more than 5 percent. 
	 Execution continuing.
 --------------------------------------------------
  RESP.ET.CPCT.HHE.2
 --------------------------------------------------
  ET CPCT 00 HHE  2009,001,00:00:00 2011,026,00:00:00
   Seed units: Velocity(in)->Counts(out)
   computed sens=1.14868E+09 (reported=1.25829E+09) @ 5.00000E-02 Hz
   calc_del=8.92261E-01  corr_app=8.92261E-01  est_delay=8.92261E-01  final_sint=0.01(sec/sample)
      stage  1: LAPLACE     A0=6.259322E+08 NZeros=  2 NPoles=  5 Sd=1.369329E+03
      stage  2: GAIN        Sd=1.000000E+00
      stage  3: FIR_SYM_1   H0=1.000000E+00 Ncoeff=  1 SamInt=1.953125E-06 Sd=8.388610E+05
      stage  4: FIR_SYM_2   H0=1.000000E+00 Ncoeff= 36 SamInt=1.953125E-06 Sd=1.000000E+00
      stage  5: FIR_SYM_2   H0=1.000000E+00 Ncoeff=  6 SamInt=1.562500E-05 Sd=1.000000E+00
      stage  6: FIR_SYM_1   H0=1.000000E+00 Ncoeff=  7 SamInt=3.125000E-05 Sd=1.000000E+00
      stage  7: FIR_SYM_2   H0=1.000000E+00 Ncoeff= 48 SamInt=6.250000E-05 Sd=1.000000E+00
      stage  8: FIR_SYM_2   H0=1.000000E+00 Ncoeff=126 SamInt=2.500000E-04 Sd=1.000000E+00
      stage  9: FIR_SYM_1   H0=1.000000E+00 Ncoeff=501 SamInt=5.000000E-04 Sd=1.000000E+00
      stage 10: FIR_SYM_1   H0=1.000000E+00 Ncoeff=501 SamInt=1.000000E-03 Sd=1.000000E+00
      stage 11: FIR_SYM_1   H0=1.000000E+00 Ncoeff=501 SamInt=2.000000E-03 Sd=1.000000E+00
--------------------------------------------------
%

Possibly someone at IRIS can comment on this further.  I think the first gain value is being modified due to a Analog PoleZero.

Brian
savage at uri.edu

On Feb 18, 2014, at 4:57 PM, Blaine Bockholt (bbckholt) wrote:

> I am attempting to remove the instrument response of some data.  I downloaded the RESPFILE from IRIS and while using the evalresp option of transfer, I get the following error:
> 
> "WARNING (norm_resp): computed and reported sensitivities[ET.CPCT.00.HHE] differ by more than 5 percent."
> 
> I thought the final sensitivity at the end of the file is the product of all the different gain/sensitivities of each stage.  When I calculate it by hand, I get the sensitivity reported.  I am not sure where this error is coming from, nor I am sure how SAC calculates the sensitivity.​  Thanks.
> 
> Blaine
> 
> Here is the command I use
> 
> trans from evalresp fname ET.CPCT.resp to none freqlim 0.001 0.002 15 20
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