RCA WV-38A Operating And Maintenance Instructions Manual page 3

RCA Volt-Ohm-Milliammeter
Description
The R C A WV-38A Volt-Ohm-Milliammeter is a completely portable,
all-purpose measuring instrument. The WV-38A will measure rms values of
A C sine-wave voltages from 0.1 volt to 5000 volts; D C voltages from 0.005
volt to 5000 volts; D C current from 1 microampere to 10 amperes; resistance
from 0.2 ohm to 20 megohms; and decibels from —20 db to +50 db. Input
resistance is 20,000 ohms-per-volt on D C , and 5000 ohms-per-volt on A C .
Features of this versatile test instrument include the use of precision
resistors in all measuring circuits, and a large, easy-to-read meter with
sensitive 50/zA movement. The panel has been specially designed with
two-color markings for simplified operation.*
A convenient function switch is provided with A C , + D C , and — D C
positions. The + D C and — D C positions of this switch reverse the polarity
of the test leads—a feature that is also helpful in checking the front-to-back
resistance ratio of electrolytic capacitors and many types of semi-conductor
devices.
Two special silicon diodes are used to protect the meter movement
against burnout due to accidental overload.* A fuse protects the precision
multiplier in the ohms network.
The WV-38A is completely portable, requiring no external power
source. Five internal batteries (not provided) are used for the ohms function
(4 penlight cells and 1 "D"-size flashlight cell). The unit weighs only 3V2
pounds, and measures 6% inches by 5^4 inches by SVs inches. Convenient
clips are provided on the handle for carrying the test leads. The WV-38A
is attractively styled, with a rugged, lightweight, bakelite case.
^Included on wired instruments with serial numbers above 20,000, and on kits with
serial numbers above 66,000 K.
Items Supplied with WV38A
1—Red Test Lead and Probe 1—Black Test Lead with Alligator
1—Slip-on Alligator Clip and Red Clip and Black Boot
Boot 1—Warranty - Registration Card
1—Instruction Book
(Batteries Not Supplied)
Available Accessories for WV-38A
WG-297 High Voltage Probe
WG-210 Resistor 900 Megohm for H . V . Probe (10 x multiplier for 5000
V . range)
WG-211 Resistor 495 Megohm for H . V . Probe (100 x multiplier for 250
V. range)
WG-270A Vinyl Carrying Case
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