Amprobe 37XR-A Manuale utente

37XR-A

Professional Digital Multimeter

Users Manual

99 Washington Street

Melrose, MA 02176

Fax 781-665-0780

TestEquipmentDepot.com

Manual Supplement 37XR-A Users

2 10/06

MADE IN TAIWAN

PATENTS PENDING

www.amprobe.com

10A MAX

FUSED

dBm

COM

10A

400mA

MAX

FUSED

CAT 1000V

CAT 600V

TRUE RMS

MAX

1000V

750V

10A

MIN MAX AVG RANGE HOLD

TTL CMOS

PEAK

REL

cal>2sec

OFF

10A

LOGIC

dBm

AC+DC

RELREC CMOS

P-P+TTL

RANGE

n F

HdBm

MAXMINAVG HOLD

025 50 75 100

SLEEP OFF

37XR-A

MADE IN TAIWAN

PATENTS PENDING

www.amprobe.com

10A MAX

FUSED

dBm

COM

10A

400mA

MAX

FUSED

CAT 1000V

CAT 600V

TRUE RMS

MAX

1000V

750V

10A

Hz mH

MIN MAX AVG RANGE HOLD

TTL CMOS

PEAK

REL

cal>2sec

OFF

10A

LOGIC

dBm

AC+DC

RELREC CMOS

P-P+TTL

RANGE

n F

HdBm

MAXMINAVG HOLD

025 50 75 100

SLEEP OFF

37XR-A

37XR-A Digital Multimeter

Contents

Safety Information ..............................................................................................2

Symbols Used in this Manual ..........................................................................2

Introduction........................................................................................................3

Making Measurements........................................................................................3

Verify Instrument Operation.............................................................................3

Range Selection...............................................................................................3

Correcting an Overload (-or -) Indication..................................................3

Measuring DC Voltage ..................................... See Figure -1- ........................4

Measuring AC Voltage (True rms)..........See Figure -2 - & -3- ........................4

Preparing for Current Measurements...............................................................4

Measuring DC Current ..................................... See Figure -4- ........................4

Measuring AC Current (True rms)...........See Figure -3- & -5- ........................4

Measuring Resistance ..................................... See Figure -6- ........................5

Testing for Continuity ...................................... See Figure -7- ........................5

Testing Diodes................................................. See Figure -8- ........................5

Measuring Capacitance ................................... See Figure -9- ........................5

Measuring Inductance ................................... See Figure -10- ........................6

Measuring Frequency .................................... See Figure -11- ........................6

Measuring Dutycycle .................................... See Figure -12- ........................6

Measuring dBm ............................................ See Figure -13- ........................6

Testing Logic Levels ..................................... See Figure -14- ........................6

Additional Features .............................................................................................7

Input Test Lead Warning..................................................................................7

True-rms Measurements .................................................................................7

MIN MAX AVG Measurements.........................................................................7

Peak Hold Measurements ................................................................................7

Beeper Off........................................................................................................8

Auto Power Off ................................................................................................8

REL (Relative) Measurements..........................................................................8

HOLD Measurements.......................................................................................8

Backlight..........................................................................................................8

Product Maintenance..........................................................................................9

Battery and Fuse Replacement....................... See Figure -15- ........................9

Repair .................................................................................................................9

WARRANTY...................................................................................................10

Specifications ...................................................................................................11

Users Manual

Safety Information

xThe 37XR-A Digital Multimeter is UL, CSA, and EN61010-1 certified for

Installation Category III – 600V and Category II – 1000V. It is recommended for

use with local level power distribution, appliances, portable equipment, etc,

where only smaller transient overvoltages may occur, and not for primary

supply lines, overhead lines and cable systems.

xDo not exceed the maximum overload limits per function (see specifications)

nor the limits marked on the instrument itself. Never apply more than 1000V

dc/750 V ac rms between the test lead and earth ground.

xInspect the DMM, test leads and accessories before every use. Do not use any

damaged part.

xNever ground yourself when taking measurements. Do not touch exposed

circuit elements or test probe tips.

xDo not operate the instrument in an explosive atmosphere.

xExercise extreme caution when: measuring voltage >20V // current >10mA // AC

power line with inductive loads // AC power line during electrical storms //

current, when the fuse blows in a circuit with open circuit voltage >1000 V //

servicing CRT equipment.

xAlways measure current in series with the load – NEVER ACROSS a voltage

source. Check fuse first. Never replace a fuse with one of a different rating.

xDo not change the position of the Function/Range Switch while the MIN MAX,

feature is enabled. Erroneous readings will result.

xRemove test leads before opening the Battery Cover or case.

Symbols Used in this Manual

 Battery :Refer to the manual

7Double insulated ;Dangerous Voltage

)Direct Current -Earth Ground

%Alternating Current 5Audible tone

, Fuse  Underwriters Laboratories, Inc

3 Complies with EU directives



Canadian Standards Association

Introduction

The 37XR-A is a true rms autoranging handheld digital multimeter for measuring or

testing the following:

xDC and AC voltage xCapacitance

xDC and AC current xDiodes

xResistance xContinuity

xInductance xdBm

xFrequency xLogic Levels, TTL or CMOS

xDutycycle

Additional features include: MIN MAX AVG, HOLD, REL, PEAK±, Backlight, and

Range Lock

Making Measurements

Verify Instrument Operation

Before attempting to make a measurement, verify that the instrument is operational

and the battery is good. If the instrument is not operational, have it repaired before

attempting to make a measurement.

Range Selection

In addition to autoranging the 37XR-A allows you to manually select and lock a

range by pressing the RANGE button. RANGE appears on the display to indicate

that manual ranging is active. Each subsequent press of the range button steps the

meter to the next higher range. When the highest range is reached the next press

returns the meter to the lowest range. To return to autoranging press and hold the

RANGE button for 2 seconds. RANGE no longer shows on the display.

Use autorange for all initial measurements. Then, when appropriate, use the RANGE

button to select and lock a range. Warning

To avoid electrical shock while manual ranging use the display

annunciators to identify the actual range selected.

Correcting an Overload (-or -) Indication :

An -or -indication may appear on the display to indicate that an overload

condition exists. For voltage and current measurements, an overload should be

immediately corrected by selecting a higher range. If the highest range setting does

not eliminate the overload, interrupt the measurement until the problem is identified

and eliminated. The -indication is normal for some functions; for example,

resistance, continuity, and diode test.

Measuring DC Voltage See Figure -1-

1. Set the Function Switch to @.

2. If RANGE is displayed, press the RANGE button to enable autoranging.

3. Connect the Test Leads: Red to , Black to COM

4. Connect the Test Probes to the circuit test points.

5. Read the display, and, if necessary, correct any overload (

) conditions.

Measuring AC Voltage (True rms) See Figure -2 - & -3-

See Additional Features to find out the advantages of true rms.

1. Set the Function Switch to &.

2. If RANGE is displayed, press the RANGE button to enable autoranging.

3. If dBm is displayed, press the yellow button to turn off dBm (enable &)

4. Connect the Test Leads: Red to , Black to COM

5. Connect the Test Probes to the circuit test points.

6. Read the display, and, if necessary, correct any overload (

) conditions.

Preparing for Current Measurements

xTurn off circuit power before connecting the test probes.

xAllow the meter to cool between measurements if current measurements

approach or exceeds 10 amps.

xA warning tone sounds if you connect a test lead to a current input before you

select a current function.

xOpen circuit voltage at the measurement point must not exceed 1000 V.

xAlways measure current in series with the load. Never measure current across a

voltage source.

Measuring DC Current See Figure -4-

1. Set the Function Switch to a current function, μA, mA, or 10A.

2. If the 10A function is not selected and RANGE is displayed, press the RANGE

button to enable autoranging.

3. Connect the Test Leads: Red to μA mA or 10A, Black to COM

4. Turn off power to the circuit being measured.

5. Open the test circuit (() to establish measurement points.

6. Connect the Test Probes in series with the load.

7. Turn on power to the circuit being measured.

8. Read the display, and, if necessary, correct any overload (

or -) conditions.

Measuring AC Current (True rms) See Figure -3- & -5-

See Additional Features to find out the advantages of true rms.

1. Set the Function Switch to a current function and range, μA, mA, or 10A.

2. If DC is displayed, press the yellow button to turn on AC.

3. If the μA or mA function is not selected and RANGE is displayed, press the

RANGE button to enable autoranging.

4. Connect the Test Leads: Red to μA mA or 10A, Black to COM

5. Turn off power to the circuit being measured.

5. Open the test circuit (() to establish measurement points.

6. Connect the Test Probes in series with the load.

7. Turn on power to the circuit being measured.

8. Read the display, and, if necessary, correct any overload (

) conditions.

Measuring Resistance See Figure -6-

1. Set the Function Switch to

2. If

is displayed, press the yellow button to display

3. If RANGE is displayed, press the RANGE button to enable autoranging.

4. Connect the Test Leads: Red to , Black to COM

5. Turn off power to the circuit being measured. Never measure resistance across

a voltage source or on a powered circuit.

6. Discharge any capacitors that may influence the reading.

7. Connect the Test Probes across the resistance.

8. Read the display. If

appears on the highest range, the resistance is too large

to be measured.

Testing for Continuity See Figure -7-

1. Set the Function Switch to

2. If

is displayed, press the yellow button to display

3. Connect the Test Leads: Red to , Black to COM

4. Turn off power to the circuit being measured.

5. Discharge any capacitors that may influence the reading.

6. Connect the Test Probes across the resistance.

7. Listen for the tone that indicates continuity (< 40 :).

Testing Diodes See Figure -8-

1. Set the Function Switch to

2. Connect the Test Leads: Red to , Black to COM

3. Turn off power to the circuit being measured.

4. Free at least one end of the diode from the circuit.

5. Connect the Test Probes across the diode.

6. Read the display. A good diode has a forward voltage drop of about 0.6 V. An

open or reverse biased diode will read

Measuring Capacitance See Figure -9-

1. Set the Function Switch to the function.

2. If RANGE is displayed, press the RANGE button to enable autoranging.

3. Connect the Test Leads: Red to COM, Black to mA

4. Turn off power to the circuit being measured.

5. Discharge the capacitor using a 100 k:resistor.

6. Free at least one end of the capacitor from the circuit.

7. Connect the Test Probes across the capacitor. When measuring an electrolytic

capacitor match the test lead polarity to the polarity of the capacitor.

8. Read the display.

Measuring Inductance See Figure -10-

1. Set the Function Switch to mH or H.

2. If RANGE is displayed, press the RANGE button to enable autoranging.

3. Connect the Test Leads: Red to H mA, Black to COM

4. Turn off power to the circuit being measured.

5. Free at least one end of the inductor from the circuit.

6. Connect the Test Probes across the inductor.

7. Read the display.

Measuring Frequency See Figure -11-

1. Set the Function Switch to Hz.

2. If % is displayed, press the yellow button to display Hz.

3. If RANGE is displayed, press the RANGE button to enable autoranging.

4. Connect the Test Leads: Red to Hz, Black to COM

5. Connect the Test Probes to the signal source.

6. Read the display.

Measuring Dutycycle See Figure -12-

1. Set the Function Switch to %.

2. If Hz is displayed, press the yellow button to display %.

3. Connect the Test Leads: Red to %, Black to COM

4. Connect the Test Probes to the signal source.

5. Read the display.

Measuring dBm See Figure -13-

The 37XR-A measures dBm relative to 1 mW referenced to 50 :. That is,

10 dBm = 10 mW, 0 dBm = 1 mW, -10 dBm = 0.1 mW, etc.

1. Set the Function Switch to dBm.

2. Press the yellow button. The display shows dBm to verify the selection.

3. Connect the Test Leads: Red to , Black to COM

4. Connect the Test Probes to the signal source.

5. Read the display.

Testing Logic Levels See Figure -14-

The 37XR-A tests logic levels for both TTL and CMOS logic. The meter displays 9

plus a



for a high-level (true) condition. The meter beeps and displays an 9and



for a low-level (false) condition. See Specifications for the logic 1 and logic 0

voltage limits. Out-of-limits indications are dispalyed as 9 only, no







or beep

occur.

1. Set the Function Switch to LOGIC

2. Press the TTL CMOS button to display the selected type.

3. Connect the Test Leads: Red to , Black to COM

4. Connect the black lead to logic common.

5. Connect the red lead to the logic test point.

6. Read the display.

Additional Features

Input Test Lead Warning

The meter emits a continuous tone when a test lead is placed in the mA or 10A

input jack and the Function/Range Switch is not set to a correct current position. (If

the meter is connected to a voltage source with leads connected for current, very

high current could result). All current ranges are protected by fast acting fuses.

True-rms Measurements

For ac measurements most DMMs average the ac input signal and display the

result as an estimated rms value. This average-responding method is accurate for

sinusoidal waveforms, but can be very inaccurate for distorted waveforms. To

ensure the most accurate measurements, always use a true-rms DMM when

measuring ac voltage or ac current on circuits for the following kinds of

applications:

xPower Supplies - diodes

xControllers

xPower Limiting - SCR or Triac

xStarting - motors

xFlorescent Lighting - ballasts

xSpeed Control - motors

xPulsed Signals

xAny non-sinusoidal ac waveform

MIN MAX AVG Measurements

The MIN MAX AVG function reads and updates the display to show the maximum

or minimum value measured after you press the MIN MAX AVG button.

Pressing the MIN MAX AVG button for less than 1 second will put the meter into a

mode of displaying the maximum, minimum, average, or actual readings. Each time

the button is pressed, the meter will cycle to the next display mode as shown in the

table below. Press the MIN MAX AVG button for more than 2 seconds to disable

this feature.

Button Display Value Displayed

< 1 second REC MAX Maximum value after feature activated

REC MIN Minimum value after feature activated

< 1 second REC AVG Average value after feature is activated

< 1 second REC Actual reading, min max being recorded.

> 2 seconds Exit MIN MAX AVG Normal measurement, actual reading

Peak Hold Measurements

Note: The PEAK function calibrates itself to meet the specifications.

Peak Hold records and stores the positive and negative peak values that occur while

measuring ac current or ac voltage. To enable the Peak Hold feature press the PEAK

button for more than 2 seconds. The display will show CAL to indicate the

calibration cycle is in process. After the CAL indication clears, press the PEAK

button again to display the maximum (P+) value for the ac voltage or ac current

being measured. The display will toggle between the P+ and P- readings each time

the PEAK button is pressed. Press the PEAK button for more than 1 second to exit

the PEAK function.

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