The 6960B is a microprocessor controlled RF power meter which combines high accuracy with fast, easy, flexible operation and simple calibration and maintenance. With the IFR 6910, 6920 and 6930 series of power sensors, the 6960B can be used to measure powers from +35 dBm (3 W) down to -70 dBm (0.1 nW) over a wide range of frequencies. FEATURES Accuracy • The instrumentation error of the 6960B is no more than 0.5% in Watts mode or 0.02 dB in dB mode. • The AUTOZERO function automatically zeros each of the instrument’s five ranges and stores the data so that zero carry-over error is less than 0.03%. • The AUTOCAL key automatically calibrates the instrument to an internal 50 MHz, 1 mW power reference. Calibration factor data supplied with each sensor ensures that highest accuracy is maintained across the whole of the sensor’s frequency range. • Power sensors are provided with individual linearity factor data. When entered into the 6060B, errors from this source are reduced to less than ±0.5% for full- scale on range 5. Speed and ease of use • Typical response time is 250 ms for manual operation, with fastest response of 25 ms when using the optional GPIB interface. Response time and resolution can be automatically optimized for each range. • In normal operation the instrument will ‘auto-range’. Any range may be ‘held’, however, to facilitate ‘peaking’ adjustments. • A ‘max-hold’ function allows only the maximum measured power value to be displayed. • Manual control is through a calculator-type keypad, which allows rapid selection of instrument settings and entry of data. • The main display is a large four-digit LCD with a variety of annunciators (see Fig. 1-1). An additional analogue meter gives a display relative to the top of the current range. Ten non-volatile memories, which can each store complete instrument settings for up to 10 years, further reduce test time and operator effort. The powerdown settings can be automatically recalled at power-up if required. • Measurements can be displayed in either logarithmic (dBm) or linear (nW, μΥ, mW, W, kW) units. • Offsets can be entered using the dB REL key to allow for attenuation or amplification of power, or to measure drift. • For pulse systems, direct readings of peak pulse power can be made by entering the appropriate duty cycle. • The automatic setting of response time/resolution can be overridden to increase resolution, giving maximum displayed resolution of 0.001 dB. • With the optional interface fitted (Option 001), the 6960B is fully programmable via the General Purpose Interface Bus (GPIB). Service requests (SRQs) are used to signal to the controller that the 6960B requires service, thus avoiding unnecessary delays in bus operation which may occur with a structured reading sequence. • An optional external DC supply input is available. Any voltage within the range 11 to 32 V can be accepted, such as from a vehicle DC supply.