Spartan 821/721 Manual Instrument Hardware Specifications A-4
Microphone & Input Physical Specifications
Microphone Preamplifier Physical Specifications
Supplied Microphone &
Preamplifier
Class 1: Model 377B02 microphone with Model PRM821 preamplifier
Class 2: Model 375A04 microphone with model PRM721 preamplifier
Typical Sensitivity 50 mV/Pa (±-1.5 dB) corresponding to -26 dB re. 1 V/Pa
Frequency Response 3 Hz to 20 kHz (±2 dB)
Microphone Connection Thread for 1/2-inch (WS-2) microphone
Microphone Polarization
Voltage
0 V; No polarization is provided; Use pre-polarized microphone
Preamplifier Connection
Latching 5-pin circular connector for PRM721/PRM821
Pinout:
1: Ground
2: Signal
3: Power
4: Sense
5: NC
Preamplifier Power Supply +36 V
Extension Cables
A preamplifier extension cable may be connected between the meter and the
preamplifier/microphone with no degradation for lengths up to 200 feet (61
m)
Full Scale Input ±14.14 Vpeak, ±10 Vrms AC
Sample Rate 48000 sps
Typical Preamplifier
Attenuation
0.08 dB
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