You can use the V-key to select a certain incremen- tation for setting the gain. You have a choice between 6 steps: • 0.0 dB (locked) • 0.5 dB • 1.0 dB • 2.0 dB • 6.0 dB • 12.0 dB H Note:
The setting 0.0 dB locks the gain in this way preventing any accidental change of setting.
You can determine the step size of the sixth step using the function dBSTEP in the function group RECV. Operation:
– Press V to change between the six steps. The corresponding step size setting is indicated below the current gain on the screen.
Operation
Setting the gain
5.2
Setting the gain
This function, operated via the left-hand rotary knob, enables you to quickly and directly set the gain. You can use the gain to adjust the required sensitivity in order to control the echo amplitudes.
Operation:
– Turn the left-hand rotary knob to set the gain. The current gain is indicated in the top left corner of the screen.
V
VV
VV – Defining the dB incrementation
for gain
You can use the V-key to select a certain incremen- tation for setting the gain. You have a choice between 6 steps: • 0.0 dB (locked) • 0.5 dB • 1.0 dB • 2.0 dB • 6.0 dB • 12.0 dB H Note:
The setting 0.0 dB locks the gain in this way preventing any accidental change of setting.
You can determine the step size of the sixth step using the function dBSTEP in the function group RECV. Operation:
– Press V to change between the six steps. The corresponding step size setting is indicated below the current gain on the screen.
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Operation
5.3
Adjusting the display range
(function group BASE)
The function group BASE enables you to make the basic adjustment of the display range.
– If required, use E to change the operating level. – Use u to select the function group BASE.
Adjusting the display range (function group BASE) The display on the screen must be adjusted for the material to be tested (function MTLVEL) and for the probe used (function P-DELAY). In addition, you must choose the range for your measurement and the display start point.
H Note:
In order to accurately adjust the material velocity and the probe delay, please read the section Calibrating the USM 25, chapter 5.7, beforehand.
Operation
5.3
Adjusting the display range
(function group BASE)
The function group BASE enables you to make the basic adjustment of the display range.
– If required, use E to change the operating level. – Use u to select the function group BASE.
Adjusting the display range (function group BASE) The display on the screen must be adjusted for the material to be tested (function MTLVEL) and for the probe used (function P-DELAY). In addition, you must choose the range for your measurement and the display start point.
H Note:
In order to accurately adjust the material velocity and the probe delay, please read the section Calibrating the USM 25, chapter 5.7, beforehand.
Krautkramer USM 25 Issue 07, 07/2003 5-7
Operation
Adjusting the display range (function group BASE)
RANGE (Display range)
You can adjust the range for your measurement in RANGE.
H Note:
The adjustment range for the display range depends on the frequency range setting (function FREQU).
Frequency range Adjustment range (c = 5920 m/s) 0.2 to 1 MHz 0.5 to 9999 mm / 0.02“ to 390“ 0.5 to 4 MHz 0.5 to 9999 mm / 0.02“ to 390“ 0.8 to 8 MHz 0.5 to 1420 mm / 0.02“ to 50“ 2 to 20 MHz 0.5 to 1420 mm / 0.02“ to 50“ You can select between coarse and fine adjustment of the values.
Coarse adjustment:
from 0.5 mm to 1400 (9999) mm in even steps
Fine adjustment:
up to 99.9 mm in steps of 0.1 mm up to 999 mm in steps of 1 mm up to 9999 mm in steps of 10 mm Operation:
– Use v to select the function RANGE and adjust the required value by means of the right-hand rotary knob.
– Toggle between coarse and fine adjustment by repeatedly pressing v. The function value is always marked with an asterisk in the fine adjustment. H Note:
The range limits are also dependent on the set sound velocities (function MTVEL): with small values for c, the range limits are shifted downwards, with large values upwards.
Operation
Adjusting the display range (function group BASE)
RANGE (Display range)
You can adjust the range for your measurement in RANGE.
H Note:
The adjustment range for the display range depends on the frequency range setting (function FREQU).
Frequency range Adjustment range (c = 5920 m/s) 0.2 to 1 MHz 0.5 to 9999 mm / 0.02“ to 390“ 0.5 to 4 MHz 0.5 to 9999 mm / 0.02“ to 390“ 0.8 to 8 MHz 0.5 to 1420 mm / 0.02“ to 50“ 2 to 20 MHz 0.5 to 1420 mm / 0.02“ to 50“ You can select between coarse and fine adjustment of the values.
Coarse adjustment:
from 0.5 mm to 1400 (9999) mm in even steps
Fine adjustment:
up to 99.9 mm in steps of 0.1 mm up to 999 mm in steps of 1 mm up to 9999 mm in steps of 10 mm Operation:
– Use v to select the function RANGE and adjust the required value by means of the right-hand rotary knob.
– Toggle between coarse and fine adjustment by repeatedly pressing v. The function value is always marked with an asterisk in the fine adjustment. H Note:
The range limits are also dependent on the set sound velocities (function MTVEL): with small values for c, the range limits are shifted downwards, with large values upwards.
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Operation Adjusting the display range (function group BASE)
MTLVEL (Material velocity)
In MTLVEL, you can set the sound velocity in the test object. You can select one of two predefined fixed values, or you can continuously vary the value. Adjustment range: 1000 - 15000 m/s
40 - 600 “/ms
You can choose between coarse and fine adjustment of the values. Coarse adjustment: in steps as follows (m/s): 15000 9000 5000 2000 14000 8000 4000 1600 13000 7000 3250 1450 12000 6320 3130 1000 11000 6000 3000 10000 5920 2730 Fine adjustment: in steps of 1 m/s (0.1 “/ms) Operation:
– Use v to select the function MTLVEL and adjust the required value by means of the right-hand rotary knob.
– Toggle between coarse and fine adjustment by repeatedly pressing v. The function value is always marked with an asterisk in the fine adjustment.
A
Attention:Always ensure that the function MTLVEL is correctly set. The USM 25 calculates all range and distance indications on the basis of the value adjusted here.
Operation Adjusting the display range (function group BASE)
MTLVEL (Material velocity)
In MTLVEL, you can set the sound velocity in the test object. You can select one of two predefined fixed values, or you can continuously vary the value. Adjustment range: 1000 - 15000 m/s
40 - 600 “/ms
You can choose between coarse and fine adjustment of the values. Coarse adjustment: in steps as follows (m/s): 15000 9000 5000 2000 14000 8000 4000 1600 13000 7000 3250 1450 12000 6320 3130 1000 11000 6000 3000 10000 5920 2730 Fine adjustment: in steps of 1 m/s (0.1 “/ms) Operation:
– Use v to select the function MTLVEL and adjust the required value by means of the right-hand rotary knob.
– Toggle between coarse and fine adjustment by repeatedly pressing v. The function value is always marked with an asterisk in the fine adjustment.
A
Attention:Always ensure that the function MTLVEL is correctly set. The USM 25 calculates all range and distance indications on the basis of the value adjusted here.
Krautkramer USM 25 Issue 07, 07/2003 5-9
Operation
D-DELAY (Display starting point)
In D-DELAY you can choose whether to display the adjusted range (for example 250 mm) starting from the surface of the test object, or in a section of the test object starting at a later point.
This allows you to shift the complete screen display and consequently also the display zero.
If the display should for example start from the surface of the test object, the value in D-DELAY must be set to 0. Adjustment range: -10 mm to +1024 mm
-0.3” to +40”
You can choose between coarse and fine adjustment of the values. Coarse adjustment: -10 mm to +1024 mm / -0.3” to +40” in even steps Fine adjustment: up to 99.9 mm in steps of 0.01 mm up to 1024 mm in steps of 0.1 mm / up to 9.999” in steps of 0.001” from 10” in steps of 0.01” Operation:
– Use v to select the function D-DELAY and adjust the value for the display starting point by means of the right-hand rotary knob.
– Toggle between coarse and fine adjustment by repeatedly pressing v. The function value is marked with an asterisk in the fine adjustment.
Adjusting the display range (function group BASE)
Operation
D-DELAY (Display starting point)
In D-DELAY you can choose whether to display the adjusted range (for example 250 mm) starting from the surface of the test object, or in a section of the test object starting at a later point.
This allows you to shift the complete screen display and consequently also the display zero.
If the display should for example start from the surface of the test object, the value in D-DELAY must be set to 0. Adjustment range: -10 mm to +1024 mm
-0.3” to +40”
You can choose between coarse and fine adjustment of the values. Coarse adjustment: -10 mm to +1024 mm / -0.3” to +40” in even steps Fine adjustment: up to 99.9 mm in steps of 0.01 mm up to 1024 mm in steps of 0.1 mm / up to 9.999” in steps of 0.001” from 10” in steps of 0.01” Operation:
– Use v to select the function D-DELAY and adjust the value for the display starting point by means of the right-hand rotary knob.
– Toggle between coarse and fine adjustment by repeatedly pressing v. The function value is marked with an asterisk in the fine adjustment.
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Operation Adjusting the pulser (function group PULS)
P-DELAY (Probe delay)
Every probe has a delay line between the transducer element and the coupling face. This means that the initial pulse must first pass through this delay line before the sound wave can enter the test object. You can compensate for this influence of the delay line in the function P-DELAY.
Operation:
– Use v to select the function P-DELAY and adjust the value for the probe delay by means of the right- hand rotary knob.
H Note:
If the value for P-DELAY is not known, read the section Calibrating the USM 25, chapter 5.7, in order to deter- mine this value.
5.4
Adjusting the pulser
(function group PULS)
You will find all functions for the adjustment of the pulser in the function group PULS.
– If required, use E to change the operating level. – Use u to select the function group PULS.
Operation Adjusting the pulser (function group PULS)
P-DELAY (Probe delay)
Every probe has a delay line between the transducer element and the coupling face. This means that the initial pulse must first pass through this delay line before the sound wave can enter the test object. You can compensate for this influence of the delay line in the function P-DELAY.
Operation:
– Use v to select the function P-DELAY and adjust the value for the probe delay by means of the right- hand rotary knob.
H Note:
If the value for P-DELAY is not known, read the section Calibrating the USM 25, chapter 5.7, in order to deter- mine this value.
5.4
Adjusting the pulser
(function group PULS)
You will find all functions for the adjustment of the pulser in the function group PULS.
– If required, use E to change the operating level. – Use u to select the function group PULS.
Krautkramer USM 25 Issue 07, 07/2003 5-11
Operation
Adjusting the pulser (function group PULS)
DAMPING (Probe matching)
This function serves for matching the probe. You can use it to adjust the damping of the probe’s oscillating circuit and to consequently change the height, width and resolution of the echo display.
You can choose between the settings high and low. The setting low has a lower damping effect and pro- duces higher and broader echoes, the setting high reduces the echo height but mostly also produces narrow echoes with higher resolution.
Operation:
– Use v to select the function DAMPING and set the required value by means of the right-hand rotary knob.
POWER (Intensity)
The function POWER allows you to adjust the intensity of the initial pulse. Choose low if you need a higher resolution and high if you are mainly interested in the penetration (with large components).
Operation:
– Use v to select the function POWER and set the required value by means of the right-hand rotary knob.
Operation
Adjusting the pulser (function group PULS)
DAMPING (Probe matching)
This function serves for matching the probe. You can use it to adjust the damping of the probe’s oscillating circuit and to consequently change the height, width and resolution of the echo display.
You can choose between the settings high and low. The setting low has a lower damping effect and pro- duces higher and broader echoes, the setting high reduces the echo height but mostly also produces narrow echoes with higher resolution.
Operation:
– Use v to select the function DAMPING and set the required value by means of the right-hand rotary knob.
POWER (Intensity)
The function POWER allows you to adjust the intensity of the initial pulse. Choose low if you need a higher resolution and high if you are mainly interested in the penetration (with large components).
Operation:
– Use v to select the function POWER and set the required value by means of the right-hand rotary knob.
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Operation
DUAL (Pulser-receiver separation)
You can activate the pulser-receiver separation in the function DUAL.
This function must be set to off in pulse-echo mode using a single-element probe. Set the function to on if you intend to work in through-transmission mode or with a dual-element (TR) probe.
Operation:
– Use v to select the function DUAL and set the function to on or off by means of the right-hand rotary knob.
The LED D (Dual) is lit with active DUAL function.