Related Manuals for BRUEL & KJAER 5935
Summary of Contents for BRUEL & KJAER 5935
- Page 1 T ec h nica l Doc ume n a ti on Dual Microphone Supply Type 5935 Brüel&Kjær 7/6-'89 BE 1300−12...
- Page 3 Dual Microphone Supply Type 5935 Valid from serial number 1628016 November 1998 BE 1300− 12 Dual Microphone Supply Type 5935 Brüel&Kjær User Guide...
- Page 4 Safety Considerations This apparatus has been designed and tested in accordance with IEC Publi- cation 348, Safety Requirements for Electronic Measuring Apparatus (see specifications), and has been supplied in safe condition. This User Guide contains information and warnings which must be followed by the user to ensure safe operation and to retain the apparatus in safe condition.
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Page 5: Table Of Contents
Input Connection ......................19 Setting the Gain ......................20 Overload.......................... 21 4. Specifications ........................23 Amplifier Stages ......................24 Power Supply ........................25 5. Service and Repair ....................... 5–1 0 − 3 BE 1300−12 Dual Microphone Supply Type 5935 User Guide... - Page 6 Contents 0 − 4 Dual Microphone Supply Type 5935 Brüel & Kjær User Guide...
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Page 7: Functional Description
Chapter 1 Functional Description 1–1 BE 1300– 12 Dual Microphone Supply Type 5935 User Guide... -
Page 8: Overview
Chapter 1 — Functional Description Overview Overview The Dual Microphone Supply Type 5935 has two main functions. Firstly, the unit supplies the necessary power requirements to attached microphone preamplifiers. Secondly, active circuitry makes it possible to amplify the output of the preamplifi- ers by up to +55 dB and to apply an A-weighting filter network. - Page 9 (8V - 16 VDC) – ve 921798e Fig.1.1 Block diagram of Type 5935 Note: Because of the switched mode of operation, the output 0V is not referenced to the negative terminal of the internal batteries or external source. This is to reduce noise within the system.
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Page 10: Channel Amplifier And Weighting Filter
1’s output appears on channel 2’s front- panel output socket. The LIN and A-weighted output sockets on the rear panel are DC coupled, and cannot be swapped. 1–4 Dual Microphone Supply Type 5935 Brüel&Kjær User Guide... -
Page 11: Controls And Connections
Chapter 2 Controls and Connections 2–1 BE 1300– 12 Dual Microphone Supply Type 5935 User Guide... -
Page 12: Front Panel
The front panel of the Type 5935 is shown in Fig.2.1. Fig.2.1 Front panel 2.1.1 Warning Indicators There are three type of warning indicator on the front panel of the Type 5935: Power On indicating that power from either internal or external sources is reaching the power supply section. -
Page 13: Switches
When plugged in, the preamplifier receives its drive voltage, the microphone-capsule polarization voltage, and the microphone heater voltage (if applied on rear panel) from the Type 5935 power supply. The preamplifier output signal also passes into the unit’s amplifiers through this connector. -
Page 14: Rear Panel
Chapter 2 — Controls and Connections Rear Panel Rear Panel The rear panel of the Type 5935 is shown in Fig.2.2. Fig.2.2 Rear Panel 2.2.1 Battery Cover The knurled knob at the top of the rear panel gives access to the battery compart- ment, which lies under the top panel. -
Page 15: Output Sockets
Note: On no account should any of the trim potentiometers now accessible be touched. Changing them causes the unit to be mis-aligned and not be within speci- fication. Re-alignment to specification can only be carried out by Brüel&Kjær repre- sentatives. 2–5 BE 1300– 12 Dual Microphone Supply Type 5935 User Guide... - Page 16 Chapter 2 — Controls and Connections Bottom Panel 2–6 Dual Microphone Supply Type 5935 Brüel&Kjær User Guide...
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Page 17: Operation
Chapter 3 Operation 3–1 BE 1300– 12 Dual Microphone Supply Type 5935 User Guide... -
Page 18: Applying Power
Chapter 3 — Operation Applying Power Applying Power 3.1.1 Power Sources There are four main sources of power for the Type 5935: Internal rechargeable batteries Internal non-rechargeable batteries External 12V battery External AC/DC converter (8–16 V output). When any of these sources is connected correctly and the On/Off switch is in the On position, the Power On LED lights. -
Page 19: External Supply
“charged” in this way. When an external supply is connected and there are rechargeable batteries in the Type 5935, the batteries receive a charge current. If the On/Off switch is in the On position, the charge current is limited to 60mA. -
Page 20: Grounding Considerations
On/Off switch is in the Off position and an external supply is connected. Grounding Considerations The signal path in the Type 5935 is referenced to the chassis of the unit. The output connectors, the ground for the preamplifiers and the heater input also use this reference ground. -
Page 21: Input Connection
Input Connection Input to the Type 5935 is via a Brüel & Kjær 7-pin preamplifier socket. The connec- tions to this socket are shown below. All standard Brüel & Kjær preamplifiers can be connected to this socket, except the Type 2660. -
Page 22: Setting The Gain
921882e Fig.3.4 Preamplifier connections (external view) If you need to send a signal into the Type 5935 other than from a preamplifier, for instance for testing and alignment, adaptor WJ 0185 can be fitted. This adaptor converts an unbalanced BNC to a 7-pin preamplifier plug. The supply voltages from the Type 5935 are not available in this mode. -
Page 23: Overload
±5 dB, so setting the gain to 20 dB and then trying to achieve a 26dB gain would not succeed. Measurement of the 1V at the output of the Type 5935 could be done using a measuring amplifier, for example Type 2636, using an oscilloscope, or using metering on the equipment attached to the output. - Page 24 Chapter 3 — Operation Overload 3–8 Dual Microphone Supply Type 5935 Brüel&Kjær User Guide...
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Page 25: Specifications
Chapter 4 Specifications 4–1 BE 1300– 12 Dual Microphone Supply Type 5935 User Guide... -
Page 26: Amplifier Stages
<13 µV <13 µV <15 µV <30 µV <70 µV A-weighting <23 0µV <13 µV <13 µV <15 µV <35 µV <100 µV <320 µV Linear Noise measured with input short-circuited 4–2 Dual Microphone Supply Type 5935 Brüel&Kjær User Guide... -
Page 27: Power Supply
External Supply: 8V to 16 V DC, smoothed or un-smoothed Supply Current: 160 mA (180 mA when preamplifiers are connected) Supply to Preamplifiers: +24VDC Polarization Voltages: 0 V, 28V, 200 V Heater Supply: +12 VDC 4–3 BE 1300– 12 Dual Microphone Supply Type 5935 User Guide... - Page 28 Chapter 4 — Specifications Power Supply 4–4 Dual Microphone Supply Type 5935 Brüel&Kjær User Guide...
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Page 29: Service And Repair
Chapter 5 Service and Repair 5–1 BE 1300– 12 Dual Microphone Supply Type 5935 User Guide... - Page 30 Chapter 5 — Service and Repair Dual Microphone Supply Type 5935 is designed and constructed to provide the user with many years of reliable operation. However, if a fault occurs which impairs its correct function and operating safety, then immediately disconnect it from the pow- er source and remove it from the instrument set-up to secure against unintended operation and prevent the risk of further damage.
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