Equipment information

Hewlett Packard 312B Level Meter
Hewlett Packard
Model 312B
Date 1975
Category: Measurement instruments
Group Level Meter
Description Selective Volt/Level Meter
                                    The Model 312B measures the amplitude and frequency of
signal components from 1 kHz to 18 MHz. It is calibrated to
read amplitude in terms of power referenced to commonly used
impedances. Frequency components are separated through the
use of selectable bandpass filters. The frequency of the
measured signal is displayed by a digital LED display.

The input can be applied either through a BNC connector or
through the 11530A probe. The input circuits of the 312B
contain a reference level attenuator that limits the input
signal to a level necessary to prevent overloading of the
input amplifier. Refer to Paragraphs 3-10 and 3-12 for the
procedure for setting the attenuator to prevent overloading
and to optimize signal-to-noise ratio.

The 312B will make both balanced and unbalanced
measurements. These measurements can be made in either
terminated or unterminated (bridged) modes. There are seven
selectable impedances in the terminated mode; 50 ohms, 60
ohms, 75 ohms, 124 ohms, 135 ohms, 150 ohms, and 600 ohms.
When in the bridged mode, the nominal input impedance is 10
kilohms in the unbalanced mode and 20 kilohms in the
balanced mode.

There are three selectable bandwidths. The 3100 Hz bandwidth
is provided for amplitude modulated (AM) and single sideband
(SSB) measurements and for ease in tuning. The 1000 Hz
bandwidth simplified calculation of noise
power per hertz of bandwidth- The 200 Hz bandwidth permits
separation of closely spaced signals and precise frequency

These manuals are available for the above equipment:

Manual Type Service and User Manual HewlettPackard-4919-Manual-Page-1-Picture
Pages 255
Size 106.16 Mbytes (111321312 Bytes)
Language english
Manual-ID/Number 00312-90046
Date February 1975
Quality Scanned document, reading partly badly, partly not readable.
Upload date
MD5 6d133b085202b16107c5d0f68be0518e
Downloads 302 since 24 November 2013
Serial Numbers: 312B-1534A00401 312D-1523A00101

This manual contains operating, applications, and servicing
information for the Hewlett-Packard Models 312B Selective
Voltmeter and the 312D Selective Level Meter. 

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