Model490 Dual Input, Dual Trace Automatic Peak Power Meter No other power meter can offer you these features: Help Mode: A Help Mode feature has been added to the Model 490 Automatic Peak Power Meter. This feature provides information for all of the 490 key functions. Automatic Operation: Automatically selects optimal time base and power range. Dual Trace Operation: Presents pulse waveforms of two traces on a calibrated graphic display. Power Measurements: Automatically measures and digitally displays peak and instantaneous power values on linear or logarithmic scales. Automatic Pulse Parameter Measurements: Measures rise time, fall time, pulse width and period with a single command. 7" Color CRT Display: Utilizes 3 colors to provide a clear presentation of both measured waveforms. Intelligent Power Head: Supplies power meter with appropriate frequency compensation and square law correction values along with the measurement data. May be field calibrated. Trace Storage: Can store and display a pulse trace while viewing a second incoming trace. GPIB Programmability: All instrument functions may be controlled via a GPIB interface making completely automatic signal acquisition and analysis available. Performance Verification: Instrument is furnished with a built-in 1 GHz reference oscillator. The Model 490 Automatic Peak Power Meter with its associated Model N439, M439, MK439, or A439 Power Head produces a flexible, powerful, versatile, accurate and simple to use instrument. The capability of measuring peak power and presenting on a CRT both the calibrated microwave pulse and a digital display of measured power values was an innovative design concept first introduced with General Microwave's Model 478 Automatic Peak Power Meter. This concept has been further enhanced in the Model 490, to permit two pulses to be displayed on a calibrated graph along with the measured values for an analysis of each pulse. These units offer simultaneous viewing and pulse analysis of two microwave signals with pulse widths as small as 15 nanoseconds. The pulses may be derived from the dual power head inputs or from one input and a stored reference. The Model 490 is equipped with a three color CRT display on which each pulse is displayed in a separate color providing an unambiguous presentation of both traces. Pulse parameters such as rise and fall time, pulse width and period can be measured automatically with the touch of a single button eliminating the uncertainty of manually selecting reference power levels. Gain and loss measurements, in either linear or logarithmic units, are performed automatically using the A/B ratio mode. The instrument has the capability of storing user programmed setup menus, which permit rapid access to as many as eight frequently used, desired test conditions. Total control of all of the features of the instrument. may be exercised via the keyboard or via the IEEE-488 General Purpose Interface Bus (GPIB). The power heads contain an EEPROM which automatically supplies the power meter with the appropriate linearity and frequency correction data. The EEPROMs are field programmable and permit field calibration of the power heads through the power meter keyboard or the GPIB.!Ill ~ 168
Model490 Specifications POWER RANGE: Normal Range:.... -20 to + 15 dbm with N439-14to +15dBmwithM439, MK439, A439 Extended Range:.. - 30 to + 15 dbm with N439-24 to + 15 dbm with M439, MK439, A439 PULSE WIDTH: Normal Range:.... 15 nsec to 1 sec and CW Extended Range:.. 1.5J.lsec to 1 sec and CW VIDEO BANDWIDTH AND RISE/FALL TIME (1 0-90%/90-10% )!1); Normal Range:.... 35 MHz, 10 nsec Extended Range:.. 500 khz, 700 nsec FREQUENCY RANGE: 0. 75 to 18 GHz with N439 0.75 to 40 GHz with MK 439 0.75 to 26.5 GHz with M439 26.5 to 40 GHz with A439 ACCURACY: See figure 1 MAXIMUM SAFE INPUT POWER: + 20 dbm CW, + 30 dbm peak (1 1-1sec max pulse width, 1% duty cycle) FREQUENCY RESPONSE: Compensated:.... ± 0.1 db to 18 GHz ± 0.3 db to 26.5 GHz (M439, MK439) ± 0.3 db to 40 GHz (MK439) ± 0.3 db 26.5 to 40 GHz (A439) Uncompensated:.. ± 0.3 db to 8 GHz INPUT IMPEDANCE: Coaxial models 50 ohms nominal ± 0.5 db to 18 GHz ± 1.0 db to 26.5 GHz (M439, MK439) ± 1.5 db to 40 GHz (MK439) ± 1.8 db 26.5 to 40 GHz (A439) VSWR: N439......... 1.2:1 to 8 GHz 1.4:1 to 18GHz M439, MK439..... 1.2:1 to 8 GHz 1:35:1 to 18GHz 1.7:1 to 26.5 GHz MK439.......... 2.0:1 to 40 GHz A439.......... 1.44:1 26.5 to 40 GHz POWER SCALE RANGE: From 0.1 to 20 dbm (or db)/division or 1 1-1W to 2 MW/division in a 1-2-5 sequence. RELATIVE OFFSET RANGE: From - 99.99 to + 99.99 db TIME BASE RANGE: From 10 nsec/division to 100 msec/division in a 1-2-5 sequence TIME MEASUREMENT ACCURACY: Dependent on Ts (Ts =trigger to sample time) When: 1 nanosec.:5 Ts.:51 microsec Then: Accuracy =.005% or 2 nsec, whichever is greater When: 1 microsec < Ts.:51 second Then: Accuracy =.005% or 10 nsec, whichever is greater TRIGGER DELAY RANGE: From 1 nsec to 1 sec with resolution of 1 nsec EXTERNAL TRIGGER REQUIREMENTS: 50 ohm Input:..... + 1.5 V to + 5 V into 50 ohms 300 nsec rise time max TTL Input:........ 10 unit load positive pulse NOMINAL MEASUREMENT TIME: 2 sec<2l per trace INTERNAL TRIGGER LEVEL RANGE: Normal Range:.... -1 0 to + 15 dbm (N439) - 5 to + 15 dbm (M439, MK439, A439) Extended Range:.. - 20 to + 15 dbm (N439) - 15to +15dBm(M439, MK439, A439) DISPLAY: 7" CRT with liquid crystal color shutter. Graph area is 201 horizontal by 151 vertical cells which are organized into 10 horizontal and 5 vertical major divisions. DISPLAY OFFSET RANGE: Up to 2 MW or 0 to + 100 dbm (or db) DISPLAY MODES: Single or Dual Alternate Trace. Input A, Input B, Memory, AlB or A/Memory! 1) See description of Power Head Options. 2) AI 201 samples per sweep in Manual mode; faster at lower number of samples; slower in Automatic mode or with wide or low repetition ra te pulses. 169