Protronix 6020 Modulation Meter

GENERAL

The Protronix Modulation Meter 6020 is designed to meet transmitter testing needs. It is an automatic tuning and level setting instrument suitable for a wide range measurement on all kind of signal sources. The carrier frequency range from 1.5MHz to 2GHz which cover the frequencies used for Cordless Telephone, Handheld Telephone, Mobile Radio Transmitter, Radio Communication System. With its wide range of measurement facilities the Model 6020 is suitable for development, production and maintenance of above products.

AM / FM MEASUREMENT

Model 6020 is designed for measuring both amplitude and frequency modulation. For FM measurement; Deviation selector is by three push-buttom switch of positive, negative deviation & average which permits assessment of modulation symmetry. For AM measurement; Modulation depth can be measured in three portion of trough, peak & average selected by three push-buttom switch which permits assessment of the symmetry of the modulation envelope.

INPUT / OUTPUT

In front panel, two signal input by BNC sockets including, low range 5mV~150mVrms, and high range 150mV~1Vrms.

In rear panel, there are 3 output terminals. An IF output is an approx. 430KHz interstage frequency which composes the modulation signal. It can be used to check IF frequency, or to apply to other equipment. This signal is controlled by AGC circuit.

An AF output with very low harmonic distortion is also available for directly connecting to oscilloscope or sinad meter to observe audio signal.

A DC output is available to provide analog output proportional to meter reading.

AUTOMATIC TUNING

Model 6020 has an internal local oscillator be automatically tuned to get IF which bit carrier frequency from 1.5MHz to 2GHz. In addition, the input section has Automatic Gain Circuitry (AGC) to automatically test carrier level from 5mV to 1V. Then, a lock LED lights and meter indicates the modulation depths or frequency deviation. The ability to adjust the post-detection band-pass is provided by a series of high-pass and low-pass filters selected by front panel push-button switch of 3 range including 3K (300Hz~3KHz, -3dB), 15K(50Hz~15KHz, -0.7dB), 30K (50Hz~30KHz, -0.7dB)

SPECIFICATION

RF INPUT SECTION

CARRIER FREQUENCY RANGE	1.5MHz~2GHz Automatic tuning and function
SENSITIVITY	Low range: 5mV~150mV PD High range: 150mV~1V PD(20dB ATT.)
MAXIMUM INPUT	3V PD
INPUT IMPEDANCE	50 Ω

FREQUENCY MODULATION

DEVIATION RANGE	1.5Hz~100KHz8 range
MODULATION RATE	50Hz~30KHz ±0.5dB refer to 1KHz
ACCURACY	Typically ±2% of full scale+ residual FM
RESIDUAL FM	20Hz/100MHz with 3K filter on

AMPLITUDE MODULATION

DEPTH RANGE	5%~100% in 6 range
MODULATION RATE	50Hz~30KHz ±0.5dB refer to 1KHz
ACCURACY	Typically ±2% of full scale
RESIDUAL AM	< 1%

OUTPUT SIGNAL

IN OUTPUT	FREQUENCY	=430KHz
	LEVEL	200mV±2dB
	IMPEDANCE	600Ω nominal
AF OUTPUT	LEVEL	1V output respect to meter reading
	IMPEDANCE	600Ω
	DISTORTION	FM<0.5% at 100K deviation AM<1% at 80% depths
DC OUTPUT	LEVEL	1V ±0.5dB at full scale
DC OUTPUT	IMPEDANCE	10KΩ nominal

LEVEL MEASUREMENT AF FILTER

AF BANDWIDTH

BAND PASS FILTER IN 3 RANGE:
   50Hz~30KHz, - 0.7dB
   50Hz~15KHz, - 0.7dB
   300Hz~3KHz, - 3dB

GENERAL

DIMENSION	260(W)X100(H)X340(D)mm
POWER	AC 115V/230V ±10%, 50/60Hz, 30W
WEIGHT	4Kgs

Specifications subject to change without notice.