Elcometer CG100ABDL Operating Instructions Manual page 21

11.5 POLARITY (CG100ABDL gauges only)
The polarity that your gauge detects on can be set to either positive or negative to obtain the best
detection results depending on the specific measurement conditions of your application. Polarity
affects both the gate (above or below the x axis in the RF A-Scan) and the Rectified A-Scan display
(whether the top or bottom half of the RF display is shown.
For further information refer to the Elcometer NDT Knowledge Centre on www.elcometerndt.com.
To adjust POLARITY:
Set the measurement screen view to RF. The option is found in MENU/TUNE/POLARITY
11.6 PULSE WIDTH (CG100ABDL gauges only)
Your gauge has an adjustable pulse width option. Pulse width refers to the duration of time the
pulser is switched on. Pulse width determines the amount of energy transmitted into the material
being tested.
There are three pulse width options:
SpikeThe Spike option is used for high resolution and general applications and can be considered
as the standard setting.
ThinWhen additional energy is needed for more penetration, the Thin option may be necessary.
WideWhen even more energy is needed for more penetration, the Wide option may be necessary.
High frequency applications, where resolution is a requirement, may require the Spike or Thin
settings to achieve optimal results. Low frequency applications, where more penetration is a
requirement, may require the Thin or Wide settings, offering increased penetration. The variety of
transducer frequencies and diameters used in conjunction with the pulse width setting, enable you
to fine tune the gauge to your application needs.
To adjust the Pulse setting:
The option to adjust the PULSE WIDTH function is found in MENU/TUNE/PULSE
11.7 PULSER VOLTAGE (CG100ABDL gauges only)
Your gauge has a 200 V square wave pulser that can be adjusted for specific applications and
transducers. The standard pulser setting is 150 V, and the Pulser Volt function allows you to
increase or decrease this value by 50 V to give greater penetration for difficult material types, or
increased resolution on noisy materials.
The option to adjust the Pulser Voltage setting is found in MENU/TUNE/PULSER VOLT.
11.8 ATTENUATOR (CG100ABDL gauges only)
Your gauge has a 20dB signal attenuator and amplifier. This feature offers a cut/boost to the overall
signal strength. In instances where the 60 dB range is not enough, or too much, this feature allows
you to increase/decrease the amplifier strength by a power of 10 (20dB). The standard setting is
zero, which is an arbitrary value. The attenuation value is added to the gain value. Therefore, if the
attenuator is increased to 20dB, this value is added to the value of the gain setting.
The option to adjust the Attenuator setting is found in MENU/TUNE/ATTENUATOR.
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