Australian Monitor RMM51 Impedance User Manual

SPECIFICATIONS

Oscillation Frequency Constant current inverter @ 1 kHz

Current Consumption approx. 2 mA

Measurement Ranges 20 / 200 / 2,000 Ω

Accuracy within ±3 % of full range

Reading Units Direct reading as Ω

Meter Movement Taut-band suspension

Withstand Voltage Meets IEC-1010, overvoltage Cat II 100 V

Double Insulated

Operating Temperature 0 ~ 40° C (32° ~ 104° F), 80% humidity

Battery Supply 6 x AA SUM-3 1.5 V Dry Cells

Net Dimensions (meter) W X D X H 100 x 50 x 170 mm

Net Weight (meter) 433.5 g

Shipping Dimensions (with case) W x D x H 235 x 105 x 260 mm

Shipping Weight (with case) 1.15 kg

Accessories Test Leads, Heavy Duty Case, Instruction Manual

Battery Maintenance

Before using the meter, always check the batteries to conﬁrm they are OK.

Simply shift the OFF switch to the BATT CHECK position and the meter needle should register in the BATT OK region of the meter.

If the battery reading does not reach the BATT OK region of the meter;

1. Disconnect the test leads and turn the meter over

2. Use a screw driver and carefully remove the screw from the battery compartment

3. Replace the 6 x AA SUM-3 cells and return the cover and screw

INSTRUCTION MANUAL

RMM51

IMPEDANCE METER

Cleaning and Storage

1. Periodically wipe the case of the meter with a moist cloth and gentle detergent, never use abrasives or solvents. Avoid water entering the case as damage or electric shock may occur.

2. If the meter is not going to be used more than 4 weeks, remove the batteries and store them separately to avoid corrosive damage due to battery leakage.

ENGINEERED BY AUSTRALIAN MONITOR

Address: 1 Clyde Street, Silverwater, Sydney NSW 2128 Australia. Private Bag 149, Silverwater NSW 1811 ACN 007 573 417 Website: www.australianmonitor.com.au International enquiries email: international@australianmonitor.com.au

DISTRIBUTED IN AUSTRALIA AND NEW ZEALAND BY HILLS SVL www.hillssvl.com.au

NSW QLD ACT WA VIC SA NZ P: 02 9647 1411 P: 07 3852 1312 P: 02 6260 4544 P: 08 9204 0200 P: 03 9890 7477 P: 08 8408 8300 P: 09 415 9426 E: nsw@hillssvl.com.au E: qld@hillssvl.com.au E: act@hillssvl.com.au E: wa@hillssvl.com.au E: vic@hillssvl.com.au E: sa@hillssvl.com.au E: sales@hillssvl.co.nz

AUSTRALIAN MONITOR RMM51 IMPEDANCE METER

OPERATION

Terminals for test leads

Operation Indicator

Battery Check, On / Off

Ohm Range Selector

(x1, x10, x 100)

Push–On, press button

operation

Timer Control (On / Off)

Meter (Impedance /

Battery Check)

Meter zero adjust

This meter has been designed and tested according to IEC Publication 348, Safety Requirements

for Electronic Measuring Apparatus, IEC-1010 (EN61010) and other safety standards.

The instrument is rated for withstand overvoltage Cat II 100V

Follow all warnings to ensure a safe operation.

CAUTION

RISK OF ELECTRIC SHOCK

The lightning ﬂash with arrowhead

symbol, within an equilateral triangle,

is intended to alert the user to

the presence of uninsulated

“dangerous voltage” within the

product’s enclosure that may be of

sufﬁcient magnitude to constitute a risk

of electric shock to persons.

WARNING: TO REDUCE THE RISK

NO USER SERVICEABLE PARTS INSIDE.

DO NOT OPEN

OF ELECTRIC SHOCK, DO NOT

REMOVE COVER (OR BACK).

REFER SERVICING TO QUALIFIED

SERVICE PERSONNEL.

The exclamation point within an

equilateral triangle is intended to

alert the user to the presence of

important operating and maintenance

(servicing) instructions in the literature

accompanying the appliance.

It is always advisable to prepare a drawing of the speaker layout prior to commencing measurement to assist in understanding and calculating the various impedance readings of your system.

Start by setting the BATT CHECK switch from OFF to the BATT CHECK position and conﬁrming that the batteries are functional. If not, refer to the Battery Operation section of the manual.

Ensure that the speaker circuit under test is not live and is

disconnected from the ampliﬁer.

1. If required, set the meter to its zero position using the meter zero adjustment.

2. Slide the OFF switch to the Ω position.

3. Set the ohm range selection switch to the appropriate range for your measurement (if in doubt, start at a higher range and work backwards).

4. Place the meter across the line under test and depress the PUSH – ON button. The meter will give you a reading for the duration of the period you are holding the button down.

5. If the meter is reading full scale deﬂection, change the range selection switch to a higher range and try again. If the meter doesn’t register, change the setting to a lower range and try again. Once an ‘in range’ reading is made, simply multiply the reading by the value of the range switch eg; 5 Ω x 10 = 50 Ω.

6. Refer to the impedance vs power chart to ensure that your power reading matches the ampliﬁer to be used. Never use an ampliﬁer on a system that has a lower impedance than that which the ampliﬁer is rated at (reduce the number of speakers on the system or change the amp). Eg; 50 Ω = 200 Watt ampliﬁer (P =V²/Z, where V is 100 Volts).

7. If a longer measuring period is required, push and hold the red ON button on the TIMER position whilst pressing the PUSH-ON button momentarily. The meter will now stay on line for approximately 5 minutes or until the OFF button is pushed on the TIMER position.

8. The meter uses a 1 kHz tone to perform its measurements and whilst this tone is on it can be used as a test tone to assist in identiﬁng speakers.

9. Don’t forget to turn the meter off after use to maintain battery life.

NOTE: If the Impedance is lower than expected, check for short circuits or faulty speakers or transformers. If the impedance is higher, recheck the wiring for poor connections or faulty speaker components. Component tolerances and additional cabling loss can cause some variation to impedance readings.

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RMM51 INSTALLATION AND OPERATION MANUAL

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