MN 921 - measuring microphone amplifier with power supply for conventional measuring microphones (7-pin LEMO) and IEPE* microphones (with adapter)
Item number: Reference - 302116 Applications Railways & Rail TransportVehicles & Road TrafficAerospace & Aviation
Price on request
Delivery time:Delivery time on request
1-channel power supply unit with variable gain, adaptation of the signal dynamic range to the dynamic range of the evaluation unit:- All voltages for condenser measuring mics (operating/polarisation/heating voltage/optional power supply /batteries, accumulators, mains, IEPE (ICP)/)- Voltages galvanically isolated (no mains hum in the output signal) - Short circuit proof voltage output (120V) - Polarization voltage regulated to ± 0.1V, can be switched off for permanently polarized mics
Microtech Gefell GmbH
Georg-Neumann-Platz
07926 Gefell
Germany
07926 Gefell
Germany
+49 36649 882 0
+49 3664 988211
Attributes of MN 921 - measuring microphone amplifier with power supply for conventional measuring microphones (7-pin LEMO) and IEPE* microphones (with adapter)
May differ from supplier data
Basic data
Channel count 1 Kanal
Frequency range 0.4 to 1 Hz
Dynamic range 0 to 138 dB
Design type Desktop unit
Typical applications
Typical applications Measurement Microphone Preamplifier
More functions and options
More functions/ options Polarization voltage 0 V / 200 V ± 0.1 V DC / 0.1 m Voltage supply with LEMO: Operation voltage for preamp 119 V ± 1V DC / 1,8 mA Voltage supply with LEMO: Polarization voltage 0 V / 200 V ± 0,1 V DC / 0,1 mA Show all Voltage supply with LEMO: Heater voltage 0 V / 5,5 V DC / 30 mA Voltage for microphone supply with IEPE: Constant current 4 mA Voltage for microphone supply with IEPE: Polarization voltage 24 V DC Measuring amplifier: AC-output voltage 2,6 V (K < 0,1 %) Measuring amplifier: AC-input voltage gain = 0,0625 41,6 Veff Frequency range (high pass of output cable capacity CL=100pF) - 3Hz...1MHz (±0,1dB) Frequency range (high pass of output cable capacity CL=100pF) - 3Hz ..1MHz (±0,1dB) 0,4Hz .. 1MHz (±3dB) Measuring amplifier: Max. dynamic range (gain = 128) 138 dB Measuring amplifier: Max. frequency f max at Ua max. and CL = 15 nF 100 KHz (K < 0,1 %) Measuring amplifier: Max. frequency f max at Ua max. and C = 47 nF 20 KHz (K < 0,1 %) Display range 81 dB (9 x 9 dB) Voltage from external AC mains adaptor at low voltage connector: 6 ... 25 V DC / 400 mA battery / accumulators, size AA - 2 x 1,5 V / 2 x 1,2 V connectors: Lemo-socket EPG.1B.307.HL connectors: Rosenberger BNC-angle-adaptor 51 K 216 - 400 connectors: Low voltage-DC-socket DC8 for Ø 1,3 mm with A 92 – BNC connector connectors:Low voltage-DC-connector for AC mains adaptor DCPP3 Ø1,3/3,5mm/length 9mm
Electrical data / Signal connections
Microphone connection Connection fittings: Lemo apparatus socket EPG.1B.307.HLN Connection fittings: Rosenberger BNC angle coupler 51 K 216 - 400 Connection fittings: Low voltage DC socket DC 8 for Ø1.3mm with A92 BNC socket Show all Connection fittings: Low voltage DC plug for plug-in power supply DCPP3 Ø1.3/3.5 mm, L: 9.0mm
Microtech Gefell GmbH
Georg-Neumann-Platz
07926 Gefell
Germany
07926 Gefell
Germany
+49 36649 882 0
+49 3664 988211