electronic A.C. voltmeter
Date: 1947-1960
Inventory Number: 2006-1-0065
Classification: Voltmeter
Subject:
Maker: Ballantine Laboratories, Inc. (1934-present)
Cultural Region:
Place of Origin:
Dimensions:
32.8 × 17.2 × 16.1 cm (12 15/16 × 6 3/4 × 6 5/16 in.)
Accessories: one small plastic card: "Use the Ballantine voltmeter. . .".
Description:
A black enameled metal case of a vertical rectangular shape. On its front it has a scale behind a rectangular window. It has two scales one alongside the other, one logarithmic in black, the other linear in red. The black scale goes from 1 to 10, and is labeled "A.C. VOLTS". The red one goes from 0 to 20 and is labeled "DECIBELS". The pointer is a very thin needle.
The front of the instrument also contains a large dial with settings from 0.01 to 100, an electrical connector labeled "AC OUTPUT", two switches labeled "NULL DET." and "ON OFF", and two large electrical connectors near the bottom, one of which is labeled "GND".
The instrument has a long power cord with standard prongs and also has a handle on top that seems to be improvised from a cut cable.
The front of the instrument also contains a large dial with settings from 0.01 to 100, an electrical connector labeled "AC OUTPUT", two switches labeled "NULL DET." and "ON OFF", and two large electrical connectors near the bottom, one of which is labeled "GND".
The instrument has a long power cord with standard prongs and also has a handle on top that seems to be improvised from a cut cable.
Signedon plaque: Ballantine Laboratories, Inc.
InscribedLabel on top: For operation on 110 - 120 volts, 50 - 60 cycles
small print below scale: CAUTION: DO NOT USE RED SCREW EXCEPT FOR / RANGE OVERLAP ADJUSTMENT UNDER CONDITIONS PRESCRIBED IN INSTRUCTION BOOK
small print below scale: CAUTION: DO NOT USE RED SCREW EXCEPT FOR / RANGE OVERLAP ADJUSTMENT UNDER CONDITIONS PRESCRIBED IN INSTRUCTION BOOK
FunctionA portable, alternating current voltmeter for a very wide range of voltages.