TOA Electronics, Inc.
IMPEDANCE METER
ZM-104
FEATURES
n
measures speaker line impedances
n
fully portable
n
easy operation
n
wide coverage: 5 - 100,000
Ω
n
reliable
n
compact and lightweight
SPECIFICATIONS
Reading Method
Direct (indicated ohms on meter)
Measurement Range
x 1 range 5-1,000
Ω
x 10 range: 50-10,000
Ω
x 100 range: 500-100,000
Ω
Oscillation Frequency
1
kHz ±10%
Accuracy
+10%
Power Supply
Four “AA” size (UM-3) batteries
(6 volts)
Service Life, when
x 1 range...30 hrs.
continuously used
x 10 range, 100 range...60 hrs.
Dimensions in in. (mm)
4.53(115) W x 7.32(186) D
x 2.16(55) H
Weight (with batteries)
2.1
lbs.(960 gr)
Standard Accessories
1 Carrying case
1 set, Measuring leads
1 impedance-power chart
DESCRIPTION
The TOA Impedance Meter, ZM-104, has been designed
to measure impedances in the speaker lines in sound
systems. It is fully portable and is operated from internal bat-
teries. This handy meter provides accurate direct readings
in the manner of a circuit meter, simply by disconnecting the
speaker line from the amplifier and connecting it to the
measuring leads.
The range selector switch allows selection of three ranges,
from five to one hundred thousand
Ω.
Each time the range
selector switch is transferred, zero
Ω
adjustment is necessary
before operation.
Its accuracy is less than plus or minus ten percent on all
ranges. The ZM-104 requires one battery change only after
more than 30 hours of continuous use.
The ZM-104 is supplied with a convenient Impedance Out-
put Chart.
The entire unit is sturdy, light and easy to carry. It weighs
a mere 2 pounds.
Specifications are subject
to change without notice.
TOA Electronics, Inc., 601
South San Francisco, California 94080
Gateway Boulevard, Suite 300
Telephone: (415) 588-2538
Fax: (415) 588-3349
PRINTED IN U.S.A. 6-94-G
