Waygate Technologies Krautkramer USM 100, Руководство по эксплуатации, Страница: 139 / 330

Pulser Receiver 5 Operation
Krautkrämer USM 100 Rev. 9 (09/2023) 139
PRF Mode
You can choose between the Auto and the Manual
mode for the PRF (pulse repetition frequency) setting.
When you select Auto the function PRF Value is
locked. The PRF is set automatically to a value of 30%
of the maximum possible PRF.
Select Manual to set the PRF Value .
PRF Value
The pulse repetition frequency indicates the number of
times an initial pulse is triggered per second.
The larger your test object, the smaller PRF values are
needed to avoid phantom echoes. However, the A-scan
update rate becomes lower in the case of smaller PRF
values. High values are therefore required if a test ob-
ject should be scanned fast.
The best way to determine the suitable PRF value is by
experimenting: Start from the highest value and reduce
the value until there are no more phantom echoes.
Pulser Mode
The USM 100 can be equipped with an optional spike
pulser. If the function
Pulser Mode is available, you can
choose between the Spike and the Square pulser type.
When the spike pulser is selected here, the functions
Voltage and Pulser Width are locked. These parame-
ters are then set automatically and optimized for high
frequency probes.
Phantom Echo
With the function Phantom Echo you can switch on the
phantom echo detection. When the function is switched
on, detected phantom echoes become visible by caus-
ing the A-scan to jump. If no phantom echoes are de-
tected, no difference is visible in the A-scan display.
Phantom echoes can occur depending on the material
properties and the set pulse repetition frequency, espe-
cially if the pulse repetition frequency is too high.