Agilent 1960-09 free download

File name 1960-09.pdf

HEWLETT-PACKARD JOURNAL T E C H N I C A L I N F O R M A T I O N F R O M T H E - d p - L A B O R A T O R I E S Vol. 12, No. 1 UBLISHED BY THE HEWLETT-PACKARD COMPANY, 1501 PAGE MILL ROAD, PALO ALTO, CALIFORNIA SEPTEMBER, 1960 A New RF Millivoltmeter for Convenient Measurements to 1 Kmc ' I 1 HE greatly increasing use of transistors and, A special convenience in an rf voltmeter of this JL more recently, the introduction of the tunnel wide range is the linear meter scale which minimizes diode, have placed increased emphasis on low-level reading errors and gives maximum resolution. In rf voltage measurement. In many applications, a con addition, a temperature compensated detector probe venient broadband laboratory and production tool is results in low calibration drift, even on the most needed to replace cumbersome tuned receiver equip sensitive range, so that accurate measurements in the ment. Measurement of the alpha cut-off of a transis millivolt range can be made with confidence. tor, the gain-bandwidth of a vacuum tube and the To enable the instrument to drive a dc strip-chart characteristics of a transmission line or filter network or X-Y recorder, a recorder output jack is provided are a few examples. at the rear of the cabinet. This output allows auto To meet this need, the new -hp- Model 411 A RF matic plotting of frequency characteristics that Millivoltmeter shown in Figure 1 has been devel would normally require laborious point-by-point oped. This high-sensitivity instrument provides ac measurement. Fig. 2, for example, shows a plot made curate voltage measurements from 500 kc up to 1 kmc with this output of the frequency response of a 30-mc and gives useful voltage indications to as high as 3i i-f amplifier at various gain settings. The voltmeter kmc. This bandwidth, coupled with full scale sensi