Belar: "When accuracy counts, count on Belar"


FMS-2 photo


The Belar Model FMS-2 Stereo Modulation Monitor is an all solid state precision stereo monitor designed to operate in conjunction with the Belar model FMM-2 baseband modulation monitor. The FMS-2 is also used for test functions in conjunction with the model FMM-2 to ensure the proper performance of FM stereo transmitters. The test and measurement capability of the FMS-2 is further enhanced by the integration of two independent auto-ranging voltmeters allowing automatic measurement of channel separation and crosstalk, along with sub-carrier suppression and noise. For example, depressing the left and right channel buttons automatically registers the wanted and unwanted channel for instant separation measurements. A front panel hold button can be used to lock the autorange to the displayed range.


Input Level 			       4.2 V P-P (3.5 V P-P Opt) composite

Input Impedance			       220k ohms, unbalanced, BNC connector


 Left Meter 		   	       Selectable: total modulation, 

                                             L + R, pilot 

                                             or left channel modulation

 Right Meter			       Selectable: pilot phase, L-R, 

                                             38 kHz suppression

                                             or right channel modulation 

Auto Range Attenuator 		        0-60 dB in 10 dB steps,

                                             calibrated full range

                                             readings:  +3 to -80 dB

Modulation Meter Range		        0 to 133%

Modulation Meter Accuracy 	        Better than 2% over entire range

Pilot Meter Accuracy		        0.5% (6% to 13% pilot modulation)


 Left to Right			        70 dB, 10 Hz to 15 kHz

 Right to Left 			        70 dB, 10 Hz to 15 kHz


 L+R to L-R			        85 dB min

 L-R to L+R 			        85 dB min

 SCA to L + R 			        Greater than 90 dB

 SCA to L- R 		 	        Greater than 90 dB

 SCA Interference 		        Greater than 90 dB


 Left and Right Channel Program Audio 	+10 dBm, 600 ohms, balanced 

 Left and Right Channel Program Test 	5 vrms,10k ohms, unbalanced

 Pilot 					3 V P-P. 27k ohm source

 Composite (less Pilot) 		4 V P-P,2k ohm source

Audio Output Specifications: 

 Frequency Response, Left and Right	+0.25 dB, 50-15,000 Hz

 Signal to Noise Ratio, 		Left and Right 90 dB min 

 Harmonic Distortion 			0.01% max. 50-15,000 Hz 

 Intermodulation Distortion 		0.01% max (SMPTE)

Remote Outputs: 			Left Meter, Right Meter, 

					     Pilot Indicator For interface 

                                             to Model MP-8 remote meter panel

Dimensions				5 1/4"H x 10 1/2"D x 19"W

                                             (EIA Rack Mount)

Power Consumption 			15 watts, 117/234 VAC, 50/60 Hz

Shipping Weight 			17 Ibs

© Copyright 2000 Belar Electronics Laboratory, Inc. All rights reserved. Specifications subject to change without prior notice.

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