where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

850 views
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


    
 
 
Udo Schlengermann
Consultant, -
Standards Consulting, Germany, Joined Nov 1998, 176

Udo Schlengermann

Consultant, -
Standards Consulting,
Germany,
Joined Nov 1998
176
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




    
 
 
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


    
 
 

Product Spotlight

GEKKO - Portable Phased Array Testing with TFM in Real-Time

The portable phased array testing system GEKKO provides 64 parallel test channels. On creating testi
...
ng parameters the operator is assisted by the CIVA software. Due to its modular set-up the GEKKO instrument is suitable for operators of all skill levels.
>

Echomac® Small

Available with up to eight channels of electronics to detect and evaluate thickness, flaws and eccen
...
tricity, this UT tester is housed in a convenient, smaller cabinet. This instrument can be used in conjunction with bubbler or immersion tank systems, or with a test bench or in laboratory applications. The Echomac® Small is available in the FD4, FD6 or FD6A versions.
>

NDT.net launches mobile-friendly design

NDT.net has revamped its website providing a mobile-friendly design.The front page received a comp
...
letely new design and all other sections are now reacting responsively on mobile devices. This has been a major step to make our website more user- friendly.
>

ISAFE3 Intrinsically Safe Sensor System

ISAFE3 intrinsically safe sensor system of Vallen Systeme is especially targeted at the petrochemica
...
l - as well as oil and gas transportation industry. The sensor system is designed for permanent monitoring or periodic inspection tasks. Sensors are available for different AE-frequency ranges optimized for corrosion and fatigue crack detection and other applications. The ISAFE 3 sensor system consists of an AE-sensor (model ISAS3) certified according to ATEX/IEC for installation in zone 0, gas group IIC, IP68, 20 to +60 °C, and a signal isolator (model SISO3) certified for installation in zone 2. An ISAS3 sensor can be mounted in atmosphere or submerged, e.g. in water or crude oil. It is supported by mounting tools for temporary (magnets) or permanent (welded) installation. ISAFE3 supports automatic sensor coupling test and can be used with any AE signal processor supporting 28V supply at 90 mA peak, e.g. Vallen Systeme ASIP-2/A.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window