Wayne Kerr 09325705 257 Automatic Modulation Meter (2 GHz) with GPIB

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Auto. Mod. Meter (2GHz) with GPIB

Automatic Modulation Meter (2 GHz) with GPIB
Frequency range 1.5 MHz to 2 GHz
Useful indications to 4 GHz
LED indication of lock, level set and function
Analogue display
Incorporates three bandpass filters, a psophometric filter, and a deemphasis network
Small, lightweight unit ideal for field use if battery version ordered
GPIB version for systems use

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List Price: $7,500.00

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Description

Wayne Kerr 09325705 257 Automatic Modulation Meter (2 GHz) with GPIB

The Automatic Modulation Meter model 257 has been designed to simplify the task of measuring amplitude and frequency modulation on signals in the range 1.5MHz to 2GHz. By eliminating the need to tune a local oscillator and make level adjustments the 257 speeds up measurements and reduces errors. Patented circuitry ensures that the meter always locks to the highest signal available ignoring spurious signals and harmonics.

AM and FM measurements can be made at full accuracy over the frequency range l.5MHz to 2GHz and with reduced accuracy and sensitivity to 4GHz. On FM, five ranges are provided with fullscale readings of 1kHz, 3kHz, 10kHz, 30kHz and 100kHz deviation. Peak positive, peak negative or mean deviation can be displayed. On AM five ranges give full scale readings of 1%, 3%, 10%, 30% and 100%. Peak, trough or mean of percentage modulation can be displayed.

For ease of measurement, three band pass filters with minimal upper cut-off frequencies of 60kHz, 15kHz and 3.5kHz, a psophcmetric filter or a 750µs de-emphasis network can be selected to filter the recovered modulation.

The different ranges and functions are selected by front panel push buttons with LED's providing positive indication of function.

The unit is small and lightweight, so making it ideal for field work, especially with the battery option installed, which will give at least 8 hours of continuous use before needing a recharge.

For automatic test facilities a GPIB option is available which provides remote control and interrogation of all functions. Note that the GPIB interface is not available if the battery option is fitted.

Manufacturer Specs

General Specifications
RF Input
Frequency Range	1.5MHz to 2.0GHz with a useful response, with reduced sensitivity, to at least 4GHz.
Tuning	Automatic tuning selects the largest available signal. Correct operation requires spurious signals to be >10dB below the wanted signal.
Acquisition Time	Typically less than 100ms to locate and lock to the carrier signal. Settling time for the demodulation and AF circuits is additional and is typically 1 second for a reading in the two thirds of the meter scale.
Lock and Level Indicator	A LED indicates that the instrument is locked to an input signal and that the level is within range.
Input Impedance	50 ohms nominal.
Input Level	The unit will lock and measure modulation for input carrier levels in the range 2mV to 1V. Full specification for noise, accuracy etc only applies over the input range 10mV to 1V.
Maximum Safe Input Level	0.5W continuous.
Local Oscillator Feed-out	Typically -60dBm.
F.M. Measurement (Over Full Frequency Range)
F.M. Ranges	Five ranges with full scale deviations of 1kHz, 3kHz, 10kHz, 30kHz and 100kHz.
Accuracy (+5°to +45°C)	±2% of full scale, ±1% of reading with 1kHz tone. See Audio filter specification for additional error due to AF response. Residual FM is additional.
Residual F.M.	<20Hz at 100MHz <100Hz at 500MHz <200Hz at 1000MHz
Distortion	<1% at 100kHz deviation with a 1kHz tone.
F.M. Measurement Modes	Peak +ve. Peak -ve and Mean deviation.
A.M. Measurement (Over Full Frequency Range)
A.M. Ranges	Five ranges with full scale indications of 1%, 3%, 10%, 30% and 100%.
Accuracy <+5°to +45°C)	±2% of full scale, ±2% of reading with a 1kHz tone. See Audio Filter specification for additional error due to audio response. Residual AM is additional.
Residual A.M.	Less than 0.5% with a 15kHz bandwidth selected.
Distortion	<1% for 80% A.M. with a 1kHz tone.
A.M. Measurement Modes	Peak, Trough and Mean of peak and trough.
Audio Filters
60kHz Bandpass Filter	250Hz - 60kHz ±0.5dB, typically 12Hz - 72kHz ±3dB with HF roll off at 80dB/decade.
15kHz Bandpass Filter	250Hz - 15kHz ±0.5dB, typically 12Hz -19.5kHz ±3dB with HF roll off at 60dB/decade.
3.5kHz Bandpass Filter	250Hz - 3.5kHz ±0.5dB, typically 12Hz - 4.0kHz ±3dB with HF roll off at 100dB/decade.
Psophometric Filter	Complies with CCITT Volume V P53.
De-emphasis network	750µs de-emphasis, 3dB bandwidth typically 12Hz to 212Hz. HF roll off 20dB/decade.
AF Output
Demodulated A.F. Output	Front Panel BNC
A.F. Output Level	'0'dBm corresponding to full scale deflection.
A.F. Output Impedance	600 ohms.
Power Requirements
Mains	240V or 120V ±15%, internally selectable.
Frequency	48 to 60Hz.
Power	Approx 6VA.
Fuse	Rear panel 100mA quick blow fuse.
Mechanical
Size	H 105mm, W 215mm, D 305mm.
Weight	Approx 1.7Kg Approx 2.6Kg with battery option.
Environmental
Operating Temperature Range	0° to 55°C. Full specification over the range to 45°C.
Storage Temperature Range	-20°C to 55°C.
Humidity	Max 95% RH at 30°C.
GPIB Interface (Optional)
Remote control and interrogation of all functions via a GPIB interface. This interface complies to the ANSI/IEEE 488-1978 standard with message formats complient with ANSI/IEEE 728-1982 standard.
GPIB address	0 to 15 selectable by rear panel DIL switch.
Subsets Implemented	SH1, AH1, T6, TE0, L4, LE0, SR1, RL1, PP0, DC1, DT0, C0.
Battery Facility (Optional)
Discharge Time	>8hrs, typically 10hrs for a fully charged battery.
Recharge Time	14hrs.
Battery Test	Pressing the 'Bat Chk’ switch displays the battery condition on the meter. A reading between 8 and 10 is required for operation.
Battery Protection	Rear panel 1A slow blow fuse.