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Technical Discussions
Mario Belo
NDT Inspection
Trenes Buenos Aires, Argentina, Joined Jan 2000, 7

Mario Belo

NDT Inspection
Trenes Buenos Aires,
Argentina,
Joined Jan 2000
7
03:00 Oct-24-2000
Doubt

Dear experts:
I would like to know, in what cases I should use the small screw located inside the control of gain of my USM 2?
does it cause some anormality to manipulate it?

Kind regards,

Mario Belo


 
 Reply 
 
Udo Schlengermann
Consultant, -
Standards Consulting, Germany, Joined Nov 1998, 177

Udo Schlengermann

Consultant, -
Standards Consulting,
Germany,
Joined Nov 1998
177
09:25 Oct-25-2000
Re: Doubt
reply by Udo Schlengermann

Hello,

We are proud to see an instrument which is more than 20 years out of production in operation:
The USM2 had a calibrated decibel-attenuator (gain) stepped in 2-dB-steps.
To set an echo from a reference reflector exactly to a reference line an additional uncalibrated gain is necessary, if the 2-dB-steps do not fit exactly.
This uncalibrated gain is changed by the screw inside the dB-knob.
It's right position gives the maximum uncalibrated gain, it's left position the minimum uncalibrated gain.
Usually this uncalibrated gain should be set to its max-position.

Kind regards

Udo Schlengermann
+++++++

: Dear experts:
: I would like to know, in what cases I should use the small screw located inside the control of gain of my USM 2?
: does it cause some anormality to manipulate it?
:
: Kind regards,
:
: Mario Belo




 
 Reply 
 
Bill Waldron
Sales
GE Inspection Technologies, USA, Joined Feb 2001, 2

Bill Waldron

Sales
GE Inspection Technologies,
USA,
Joined Feb 2001
2
02:48 Oct-25-2000
Re: Doubt
: Dear experts:
: I would like to know, in what cases I should use the small screw located inside the control of gain of my USM 2?
: does it cause some anormality to manipulate it?
:
: Kind regards,
:
: Mario Belo

Mario,
This screw gives 10 dB of gain adjustment and does not affect linearity. Its intended use is to provide a means to fine adjust an echo to a reference level.
(As the USM2 attenuator is in 2 dB steps, it may not be possible to get an echo to an exact level. In this case you would use the small screw adjustment to fine tune the gain level.
Bill Waldron


 
 Reply 
 

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