From the day they are new, attenuators are all slightly different due to manufacturing tolerances. HP step attenuators have no internal adjustments, and so it should not be assumed that a "calibrated" unit is somehow better than one which is not. At best, the presence of a calibration label means only that the performance met the originally specified tolerances when it was measured. We go one step further than this. We sweep the test frequency over a wide range, and capture all of the data.

The HP 33321SG is an OEM remote control device with 5dB, 10dB, and 20dB sections, giving 0-35dB in 5dB steps. This fully certified unit meets or exceeds HP specifications up to 12GHz and is suitable for use as a lab reference. Little used, in excellent cosmetic condition. Please view the measurement data, and HP technical manual.