B&K 2250 Light Instrukcja Użytkownika Pobierz pdf (Strona 90)

Hand-held Analyzer Types 2250 and 2270 – User Manual

Fig.8.6

Storage Settings screen

8.1.5 Headphone Settings

The Headphone Settings allow you to control the output to the headphone socket on the

connector panel.

Commentary annotations on measurements can always be heard on the headphones, regardless

of the options chosen in Headphone Settings.

In addition to the commentary annotations, you can listen to the measured signal for

monitoring purposes. Select between A/B-weighted, C-weighted or Z-weighted. (A/B-weighting

is determined by setting the parameter in Setup > Frequency Settings > Broadband

(excl. peak)).

The measured signal covers approximately 120 dB (from approximately 20 dB to 140 dB with

a Type 4189 or Type 4190 microphone of nominal sensitivity). The output of the headphone

socket covers approximately 75 dB. Use the Gain settings for the measured signal to adjust the

output level to suit the listening conditions. If the signal has a very high dynamic range (or the

levels are unknown), you can set Automatic Gain Control to On – this will convert the 120 dB

input range to 40 dB output range enabling you to hear signals of any level clearly.

Individual Gain settings are provided for the commentary annotations and the measured signal.

Tap the gain parameter and use the keypad to enter a new setting. Use ‘@’ to assign the new

value for immediate response at the output – or use the up/down navigation keys to

increment/decrement the value.

Note 1: A 0 dB gain on the measurement signal means you get a 1 V output for a 1 V input

(when the measured signal Automatic Gain Control is set to Off).

Note 2: While playing back an annotation, you can use the up/down navigation keys to

increase/decrease the gain of the annotation.

Note 3: If you do not want to listen to the input signal, then set the Listen to Signal parameter

to No, to economise on power.

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B&K 2250 Light Instrukcja Użytkownika Strona 90