Olympus EPOCH 600, Basic Operation Manual

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DMTA ‐ 10007 ‐ 01EN [U8778365], Rev. B, June 2010
34 Chapter 2
Gain can also be automatically adjusted using the AUTO XX% feature. See “Special
Functions” on page 32.
2.2.2 Reference Gain
You can define a reference gain by pressing [2
ND
F], (REF dB) . This sets the current
gain as the reference gain and activates a scanning gain for further adjustments (see
Figure 2 ‐ 9 on page 34).
When the reference gain is set, the [P <n> ] parameter keys allow access to the
following functions:
• Add : Combines current scanning gain with current reference gain and sets the
resultant as the new reference gain.
• Scan dB : Toggles between current scanning gain and 0.0 dB scanning gain.
• Off : Turns off reference gain feature (scanning gain is lost).
• +6 dB : Increases the scanning gain by 6 dB.
• –6 dB : Decreases the scanning gain by 6 dB.
Figure 2 ‐ 9 The reference and scanning gains
2.2.3 Pulser
The EPOCH 600 main pulser functions are accessible by selecting the Pulser menu.
Each individual pulser parameter is displayed above the parameter keys, and can be
adjusted by pressing the corresponding [P <n> ] parameter key.
The following pulser functions are available for live adjustment in the Pulser menu:
• PRF Mode : Selects either Auto or Manual PRF adjustment mode. Auto changes
the PRF setting based on the screen range, and Manual allows manual adjustment
of PRF in 10 ‐ Hz increments.
• PRF : Pulse Repetition Frequency (PRF) values range: from 10 Hz to 2000 Hz in
10 ‐ Hz increments
• Energy : Pulse voltage values available: 0 V, 100 V, 200 V, 300 V, or 400 V
• Damp : Pulse damping values available: 50 Ω , 100 Ω , 200 Ω , or 400 Ω
Scanning gain Reference gain