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Automatic Modulation Meter
Automatic AM-FM Modulation Meter designed for extensive use in accurate AM-FM measurements in development, production, testing, servicing and maintenance of static and mobile communication systems. This instrument provides high sensitivity of the order of 10mV up to 2 GHz with useful response up to 4 GHz. De-emphasis facility is also provided. Eliminating the need to manually tune a local oscillator and make level adjustments, this instrument speeds up measurement and improves accuracy. Being compact, light weight and portable it is an ideal instrument for field work.
    • Frequency Range 1.5 MHz to 2 GHz                     
    • AM and FM measurement over full range
    • Automatic tuning and level setting
    • LED lock indication
    • Weighted measurements
    • Overload protection
    • Compact and light weight
 
Specifications  
Frequency Range 1.5 MHz to 2 GHz continuous coverage. Useful response up to 4 GHz
Input Level 10 mV to 1 Volt.
Overload up to 7 volts. (rms)
Input Impedance 50 ohms (nominal)
Acquisition Time 1 sec. (Typical)
Lock Indication & Level Monitor LED
Display 3 digit LED display
Display overload Fully protected against over load
Audio Filters
Ranges     25 Hz - 60 kHz
25 Hz – 15 kHz
300 Hz - 3 kHz
Response + 0.5 dB with respect to 1 kHz
De-emphasis Selectable 50µs, 75µs or 650µs
FM Measurements
FM Ranges 10 kHz, 100 kHz
FM Resolution 0.01 kHz for 10 kHz range
0.1 kHz for 100 kHz range
Accuracy +1% of FS +2% of reading at 1 kHz rate, plus deviation error of approximately +20 Hz at carrier frequencies up to 100 MHz and thereafter increasing at 6 dB per octave (over the temperature range 5°C to 45°C)
Residual FM Less than 100 Hz at 500 MHz
Distortion Less than 1% for 100 kHz deviation at 1 kHz rate.
AM Rejection At least 80% in FM mode with 100 kHz deviation at 1kHz rate.
Measurement Peak Positive deviation
Modes       Peak Negative deviation; Mean of positive and negative measurements.
Difference between positive and negative measurements.
Speech average to indicate relative loudness of audio.
Selection of Psophometric filter (CCITT)
Signal Output
IF Output 420 kHz, 100mV (Nominal) through 50 Ohms BNC Connector on rear panel.
AF Output 0.5V at FS, 600 Ohms BNC Connector on front panel for 10 and 100 AM/FM range.
Power Requirement 230V AC + 10%. 5VA typical
Dimensions (Approx.) 112mm x 226mm x 303mm ( H x W x D )
Operating Temperature 0°C to 55°C
Humidity 95% RH at 40°C
Weight (approx.) 3 Kg.
Accessories N to BNC Adaptor, BNC-BNC cable
AM Measurement
AM Ranges 10%, 100%
AM Resolution 0.01% for 10% FS range0.1 % for 100% FS range
Accuracy  +1% of FS, +2% of reading &  residual AM (over the temperature range 5°C to 45°C)
Residual AM Less than 0.5% with a 15 kHz bandwidth selected
Distortion   Less than 1%for 80% at 1KHz
Measurement - Peak Modes

Trough; Mean between peak & trough; Difference between peak & trough;

Speech average to indicate relative loudness of audio; Selection of Psophometric filter (CCITT)

Optional Features 200 KHz FM range
Dual Battery operation
 
 
 
 
* Products not listed can be ordered as per request.
* Model number may subject to change without intimation