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Image Not Available for true RMS voltmeter
true RMS voltmeter
Image Not Available for true RMS voltmeter

true RMS voltmeter

Inventory NumberWJ0649
ClassificationVoltmeter
Subject
    Maker Ballantine Laboratories, Inc. 1934-present
    Maker Weston Electrical Instrument Corporation founded 1888
    Place of OriginNewark, New Jersey, United States
    Dimensions22 × 50.5 × 30 cm (8 11/16 × 19 7/8 × 11 13/16 in.)
    DescriptionMounted in instrument rack #17 (WJ0648)
    Signedetched and white fille on front panel: TRUE ROOT-MEAN-SQUARE VOLTMETER / MODEL 320 on face of meter: (BL logo) / BALLANTINE LABORATORIES, INC. plate on back: SPECIAL VERSION 320 S/4 / TRUE ROOT-MEAN-SQUARE VOLTMETER / MODEL NO. 320 SERIAL NO. 1142 / 5 C.P.S. TO 500,000 C.P.S. / 100 MICROVOLTS TO 320 VOLTS R.M.S. / INPUT RESISTANCE TO MEGAOHMS SHUNTED BY / 25 µµF, BELOW 10 MV AND 8 µµF ABOVE 10 MV / MADE BY BALLANTINE LABORATORIES, INC. / BOONTON, N.J. U.S.A.
    Inscribedprinted on face of meter: CALIBRATION / SET RANGE SWITCH ON 3.2 MV, 100 MV 3.2 V OR 100 V RANGE / SWITCH CAL. ADJUST CAL ADJ FOR 100 DB READING / SET RANGE SWITCH ON NEXT HIGHER RANGE / ADJUST METER SCREW FOR 0 DB RANGE.
    Curatorial Remarksoriginally had the CHSI inventory number WJ0310 but this belongs to an instrument that is supposedly on the fifth floor of the Science Center. The number was changed to WJ0649 on 9/17/97. There is a chance that both WJ0310 and the current WJ0649 are one and the same so this matter should be investigated. Instruments in the Stevens exhibit were not weighed; the number in that field is an estimate and may not be accurate located in the Stevens exhibit in the basement of William James Hall
    True RMS voltmeter
    True RMS voltmeter
    Ballantine Laboratories, Inc.
    Date: circa 1970
    Object number: 2003-1-0169
    True RMS Voltmeter
    True RMS Voltmeter
    Ballantine Laboratories, Inc.
    Date: circa 1945
    Object number: WJ0310
    True RootMean Square Voltmeter
    True RootMean Square Voltmeter
    Ballantine Laboratories, Inc.
    Object number: WJ0375
    electronic A.C. voltmeter
    electronic A.C. voltmeter
    Ballantine Laboratories, Inc.
    Date: 1947-1960
    Accessories: one small plastic card: "Use the Ballantine voltmeter. . .".
    Object number: 2006-1-0065
    Voltmeter, electronic
    Voltmeter, electronic
    Ballantine Laboratories, Inc.
    Object number: WJ0563
    Voltmeter, Electronic
    Voltmeter, Electronic
    Ballantine Laboratories, Inc.
    Object number: WJ0582
    instructions for using "The Ballantine Rule"
    instructions for using "The Ballantine Rule"
    Ballantine Laboratories, Inc.
    Date: copyright 1953
    Accessories: "The Ballantine Rule," see 1998-1-1372a
    Object number: 1998-1-1372b
    "The Ballantine Rule" slide chart for calculating voltage decibels
    "The Ballantine Rule" slide chart for calculating voltage decibels
    Ballantine Laboratories, Inc.
    Date: copyright 1953
    Accessories: Instruction booklet, see 1998-1-1372b
    Object number: 1998-1-1372a
    SH Choke, 0.033 Henries, 7A D.C., 1789 V RMS
    SH Choke, 0.033 Henries, 7A D.C., 1789 V RMS
    Submarine Signal Company
    Object number: RS1165
    Label found with WJ0344
    early noise generator
    Psycho-Acoustic Laboratory, Harvard University
    Date: circa 1942
    Object number: WJ0344
    Label found with WJ0337
    three channel pre-amplifier mixer
    Psycho-Acoustic Laboratory, Harvard University
    Date: circa 1941
    Object number: WJ0337
    Image Not Available for input for mixing attenuator
    input for mixing attenuator
    Psycho-Acoustic Laboratory, Harvard University
    Date: circa 1941
    Object number: WJ0643