Overview
The Amplifier Research 25A250B is a solid-state, selfcontained, air-cooled, broadband amplifier designed for applications where instantaneous bandwidth, high gain and linearity are required. Available in a stylish, contemporary cabinet for benchtop use or with cabinet removed for rack mounting.
The Model 25A250B, when used with a sweep generator, will provide a minimum of 25 watts of RF power. Included is a front panel gain control which permits the operator to conveniently set the desired output level. The 25A250B is protected from RF input overdrive by an RF input leveling circuit which controls the RF input level to the RF amplifier first stage when the RF input level is increased above 0dBm.
The RF amplifier stages are protected from over-temperature by removing the DC voltage to them if an overtemperature condition occurs due to cooling blockage or fan failure. The front panel indicates the operate status and fault conditions if an over-temperature or power supply fault has occurred. The unit can be returned to operate when the condition has been cleared.
All amplifier control functions and status indications are available remotely through the optional Remotes Package. The Remotes Package includes GPIB/IEEE-488 format, RS-232 hardwire and fiber optic, USB, and Ethernet. The bus interface connector is located on the back panel and positive control of local or remote operation is assured by a Local/Remote switch on the front panel of the amplifier.
Also included with the Remotes Package is a safety interlock circuit for use with external safety switch interlocks. This circuit prevents the amplifier from going into operate mode unless the external connection is made. A jumper plug is provided for cases where this functionality is not needed. The export classification for this equipment is EAR99.
25A250B TYPICAL OUTPUT POWER
| Specifications | |
| RATED POWER OUTPUT | 35 watts typical, 25 watts minimum |
| INPUT FOR RATED OUPUT | 1.0 mW Max |
| POWER OUTPUT @ 3dB COMPRESSION | Typical: 35 watts, Minimum: 25 watts |
| POWER OUPUT @ 1dB COMPRESSION | Typical: 30 watts, Minimum: 20 watts |
| FLATNESS | ±1.0 dB typical, ±1.5 dB maximum |
| FREQUENCY RESPONSE | 10kHz-250 MHz instantaneously |
| GAIN (at maximum setting) | 44 dB minimum |
| GAIN ADJUSTMENT (Continuous Range) | 20 dB minimum |
| INPUT IMPEDANCE | 50 ohms, VSWR 2.0:1 maximum |
| OUTPUT IMPEDANCE | 50 ohms, nominal |
| MISMATCH TOLERANCE | 100% of rated power without foldback. Will operate without damage or oscillation with any magnitude and phase of source and load impedance. |
| MODULATION CAPABILITY | Will faithfully reproduce AM, FM, or Pulse modulation appearing on input signal. |
| THIRD ORDER INTERCEPT | 55 dBm typical |
| NOISE FIGURE | 8 dB typical |
| HARMONIC DISTORTION | Minus 20 dBc maximum at 20 watts, -35 dBc typical at 15 watts |
| SPURIOUS | Minus 73 dBc typical |
| PRIMARY POWER (Universal; selected automatically) | 100-240 VAC, 50/60Hz, 200 watts |
| CONNECTORS | |
| RF Input | N female |
| RF Output | N female |
| Remote Interfaces | |
| IEEE-488 | 24 pin female |
| RS-232 | 9 pin Subminiature D (female) |
| Fiber Optic | ST Conn Tx and Rx RS-232 |
| USB 2.0 | Type B |
| Ethernet | RJ-45 |
| SAFETY INTERLOCK | 15 pin Subminiature D |
| COOLING | Forced air (self contained fans) |
| WEIGHT | With Cabinet 16.7 kg (37 lbs) Without Cabinet 8.6 kg (19 lbs) |
| SIZE (W x H x D) | With cabinet: 50.3 x 15.5 x 55.1 cm (19.8 x 6.1 x 21.7 in) Without Cabinet: 48.3 x 13.2 x 55.1 cm (19 x 5.2 x 21.7 in) |
| ENVIRONMENTAL | Operating Temperature: 5°C / +40°C Operating Altitude: Up to 2000M Shock and vibration: Normal Truck Transport |
| REGULATORY COMPLIANCE | |
| EMC | EN 61326-1 |
| Safety | UL 61010-1 CAN/CSA C22.2 #61010-1 CENELEC EN 61010-1 |
| RoHS | DIRECTIVE 2011/65/EU |
| EXPORT CLASSIFICATION | EAR99 |
