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Summary of Contents for Gold Line ZM1
- Page 1 OPERATOR'S MANUAL Model ZM1 Impedance Meter with Calculated Watts...
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Page 2: Display, Description
The ZM1 displays ac impedance and calculated power for constant voltage (transformer coupled) loudspeaker systems. The ZM1 measures impedance by applying a constant current to the device under test (such as a resistor, a capacitor, an inductor, a loudspeaker, or any electrical circuit) and then measuring the resulting voltage. The voltage is directly related to impedance by Ohm's law for ac voltages. -
Page 3: Batteries, Installation
100 volts. f the ZM1 does not read close to 0 or out of range first check to make sure the test leads are good and the contact points are not corroded. Also check that the "BAT" indication is not appearing on the display. -
Page 4: Transformer Voltage, Power & Impedance
When measuring calculated power with the ZM1, it is best to take data at 330Hz or 1kHz. This is because the impedance values at these frequencies are close to the characteristic impedance. For example, if the 8Ω speaker read exactly 8Ω at 330Hz then the calculated watts in a transformer coupled system would read correct power at 330Hz. -
Page 5: Impedance, Measuring
(5x20W=100W), then the total calculated power would be 190 watts (90W+100W=190W). Note that the ZM1 has four different system voltages, 100, 70.7, 50 and 25 Volts. These voltages simply change the calculation within the ZM1; no such output voltages are presented to the test leads. -
Page 6: Accuracy And Resolution
± 2% for impedance and ± 3% for calculated watts. The ZM1 has been factory calibrated at 1,000 ohms on the 2K scale for impedance, and at 316 watts on the 2000 watt scale for calculated watts. -
Page 7: Table Of Contents
Inductors, 4 Networks, 5 Resistors, 4 Transformers, 5 OHMS Function, quick check, 1 OPERATION, 2 QUICK CHECK, 1 SPECIFICATIONS, 8 SWITCHES, description, 2 Frequency, 1 Function, 1 Range, 1 Voltage,1 WARRANTY, 7 WATTS Function, quick check, 2 ZM1 DESCRIPTION, 1... -
Page 8: Warranty
NOTES: WARRANTY and Factory Service GOLD LINE products are proudly made in the USA and are covered by a one year limited warranty. For details of this warranty, consult the enclosed warranty registration card or your local dealer. GOLD LINE Customer Service will help you get the most from your new analyzer. For answers to questions regarding use of the unit, or for information not covered in this manual, please write us. -
Page 9: Specifications
SPECIFICATIONS INPUT CONNECTORS: Banana Jacks DISPLAY: 3 ½ Digit LCD ± 2 % ACCURACY: (TYPICAL) IMPEDANCE ± 3 % WATTAGE TEST FREQUENCIES: 100Hz, 330Hz, 1kHz, 10kHz VOLTAGE RANGES: 25Vac Some U.S.A. public schools & institutions 50Vac International. 70.7Vac U.S.A. Industrial standard. 100Vac International.
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