Setting Reference Gain And Scanning Gain - Olympus EPOCH 650 User Manual

DMTA-10055-01EN, Rev. A, February 2015
You can use the AUTO XX% feature to bring an echo to XX% FSH in any gate.
To use AUTO XX% feature
1. Press GATES to select the gate that measures the echo to be adjusted.
2. Press 2 F, (AUTO XX%) to activate the AUTO XX% feature.
ND
AUTO XX% can be activated at any time during operation. If you do not actively
select a gate, AUTO XX% is applied to Gate 1.
5.3

Setting Reference Gain and Scanning Gain

Establishing the current system gain as the reference (base) level is useful for
inspections that require adding or subtracting scanning gain based on the relation to a
fixed gain level.
To set reference gain and adjust
1. Press 2 F, (REF dB).
ND
The gain display reads: REF XX.X + 0.0 dB. Scanning gain can now be added or
subtracted.
2. Adjust the scanning gain in either coarse or fine increments.
While using the reference gain and scanning gain, the following parameters appear at
the bottom of the screen.
• Add
Used to add the current scanning gain to the current reference gain for "transfer
correction."
• Scan Db
Used to toggle the scanning gain from the active level to 0.0 dB (reference level)
allowing a direct amplitude comparison to the reference indication.
• Off
Used to exit the reference gain function without adding the scanning gain to the
base instrument gain.
106 Chapter 5