B&K 2250 Light Bedienungsanleitung PDF herunterladen (Seite 28)

Hand-held Analyzer Types 2250 and 2270 – User Manual

2.5.3 Alternative Measurement Method (Extended Microphone)

The measurement microphone can be placed a distance from the analyzer by connecting an

extension cable and fitting the microphone to a microphone holder or to Outdoor Microphone

Kit UA-1404. The analyzer should be set up using the following assembly instructions. This is

to ensure that the accessories have limited acoustical influence on the analyzer during

measurement. All the components described below are shown in Fig.2.1 and Fig.2.4.

Mounting the Outdoor Microphone Kit

For long-term outdoor measurements, Outdoor Microphone Kit UA-1404 will be required as

an alternative to the windscreen. If this is the case, mount the kit onto the microphone and

preamplifier combination according to assembly and mounting instructions in the User Manual

for the Outdoor Microphone Kit, BE 1077.

Connecting a Microphone Extension Cable

The optional extension cables that are recommended for use with Type 2250/2270 are:

• AO-0697-D-030 – 3 m long

• AO-0697-D-100 – 10 m long

Note: Connecting a recommended microphone extension cable has no acoustical effect on the

hand-held analyzer’s measurement and has no effect on the analyzer’s calibration. However,

although it is not essential to re-calibrate, it is good measurement practice to calibrate the

whole measurement chain (including microphone extension cable) before starting a

measurement.

Decide which cable you require and assemble as follows:

1) Gently screw the microphone onto Preamplifier ZC-0032, see items 1 and 2 in Fig.2.1.

2) Insert the preamplifier into the female plug of the extension cable and push gently until it

snaps into position.

3) Insert the male plug of the extension cable into the top socket of the hand-held analyzer

(see item 17 in Fig.2.1) and push gently until it snaps into position.

Connecting Two Microphones (Type 2270 only)

To connect two microphones to a Type 2270, use the Dual 10-pole Adaptor JP-1041, two

extension cables (AO-0697-D-030 3 m long or AO-0697-D-100 10 m long) and two

Preamplifiers and two Microphones.

1) Gently screw the Microphones onto Preamplifiers ZC-0032, see items 1 and 2 in

Analyzer Components (Fig.2.1).

2) Insert the preamplifiers into the female plugs of the extension cables and push gently until

into position.

3) Insert the male plugs of the extension cables into the female plugs of the dual 10-pole

adaptor and push gently until they snap into position.

Note: Channel 1 is tagged CH 1 and Channel 2 is tagged CH 2 on the dual 10-pole adaptor.

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B&K 2250 Light Bedienungsanleitung Seite 28