MATRIX MODEL HD-500 
HUM DETECTOR (DEMODULATOR)

The MATRIX Model HD-500 is a detector-amplifier designed to demodulate the low frequency amplitude modulations on any RF carrier over the range of 5 to 1500 MHz. These modulations are usually the undesirable result of the 50 or 60 Hz power source and are not necessarily sinusoidal. The unit is calibrated to the SCTE definition of hum modulation, which is the ratio of the peak-to-peak hum modulation to the peak of the carrier. The magnitude of the demodulated signal is proportional to the degree of modulation and independent of the carrier level over a range of -10 to -50 dBm.

To view/print this product sheet in Acrobat Reader PDF format click here.

For more detailed operation and Setup information see Measuring Hum Modulation Using Matrix HD-500.

For an Acrobat Reader version of the Setup information suitable for printing click here.

Some Important Specifications:

RF frequency range 5 to 1500 MHz
RF input power range -10 to -50 dBm
Input return loss < - 15 dB, 50 Ohm 75 Ohm optional
Output voltage 3000 mV peak to peak for -40 dBC Hum
300 mV peak to peak for -60 dBC Hum
30 mV peak to peak for -80 dBC Hum
3 mV peak to peak for -100 dBC Hum
Noise floor < -105 dBC
Maximum output voltage 20 Volts peak to peak
Modulation bandwidth 5 Hz to 500 Hz. Internal amplifier provides linear phase response. A 60 Hz square wave is reproduced with less than 2% tilt.
Power requirements
    Module

    Rack Mounted Unit
+15 Volts and -15 Volts @ 50 mA each

100 - 240 Volts 50/60 cycle, 3 amps max.
External equipment required 1. Digital storage oscilloscope with signal-averaging capability.
2.Carrier source with hum modulation levels lower than the levels that are to be measured.
Overall accuracy  +/- 1 dB for carrier and modulation levels specified above
Software  Software interfaceable. Automated measurement software available.

 

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