Metermann 37XR User Manual [en, de, fr, it]

Professional Digital Multimeter

True-RMS with Component and Logic Test

Users Manual

•

Mode d'emploi

•

Bedienungshandbuch

•

Manuale d'Uso

•

Manual de uso

37XR 37XR

MAXMINAVG HOLD

RELREC

P-P

AC+DC

RANGE

SLEEP OFF

0 25 50 75 100

REL

MIN MAX AVG

PEAK

cal >2sec

LOGIC

dBm

OFF

TRUE RMS

CAT 1000V

CAT 600V

COM

400mA

MAX

FUSED

10A

10A MAX

FUSED

RANGE HOLD

% Hz

MAX 1000V

750V

TTL

CMOS

n FCF

HdBm

% Mk

TTL CMOS

10A

dBm Hz

MADE IN TAIWAN

PATENTS PENDING

metermantesttools.com

37XR 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 (oor -o

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

) Indication ............................................... 3

Users Manual

• The 37XR 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.

• Do 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.

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

damaged part.

• Never ground yourself when taking measurements. Do not touch exposed

circuit elements or test probe tips.

• Do not operate the instrument in an explosive atmosphere.

• Exercise 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.

• Always 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.

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

feature is enabled. Erroneous readings will result.

• Remove test leads before opening the Battery Cover or case.

Safety Information

Symbols Used in this Manual

Battery

Double insulated

Direct Current

Alternating Current

Fuse

Complies with EU directives

Refer to the manual

Dangerous Voltage

Earth Ground

Audible tone

Underwriters Laboratories, Inc

Canadian Standards Association

Introduction

The 37XR is a true rms autoranging handheld digital multimeter for measuring or testing the following:

• DC and AC voltage • Capacitance

• DC and AC current • Diodes

• Resistance • Continuity

• Inductance • dBm

• Frequency • Logic Levels, TTL or CMOS

• Dutycycle

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 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.

To avoid electrical shock while manual ranging use the display annunciators to identify the actual range selected.

Correcting an Overload (oor

An oor -o

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 o indication is normal for some functions; for example, resistance, continuity, and diode test.

Warning

) Indication

Measuring DC Voltage See Figure -1-

1. Set the Function Switch to v.

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

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

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

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

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 V)

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

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

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

Preparing for Current Measurements

• Turn off circuit power before connecting the test probes.

• Allow the meter to cool between measurements if current measurements

approach or exceeds 10 amps.

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

select a current function.

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

• Always 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 CO M

4. Turn off power to the circuit being measured.

5. Open the test circuit (X) 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 (oor -o

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 CO M

5. Turn off power to the circuit being measured.

) conditions.

5. Open the test circuit (X) 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 (o) conditions.

Measuring Resistance See Figure -6-

1. Set the Function Switch to Ω.

2. If R is displayed, press the yellow button to display Ω.

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

4. Connect the Test Leads: Red to E, 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 o 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 R.

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

3. Connect the Test Leads: Red to E, 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 Ω).

Testing Diodes See Figure -8-

1. Set the Function Switch to G.

2. Connect the Test Leads: Red to E, 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 o.

Measuring Capacitance See Figure -9-

1. Set the Function Switch to the P 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 kΩ 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

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.

H mA, Black to COM

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 measures dBm relative to 1 mW referenced to 50 Ω. 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 E, Black to COM

4. Connect the Test Probes to the signal source.

5. Read the display.

Testing Logic Levels See Figure -14-

The 37XR tests logic levels for both TTL and CMOS logic. The meter displays plus a ∧ for a high-level (true) condition. The meter beeps and displays an a ∨ for a low-level (false) condition. See Specifications for the logic 1 and logic 0 voltage limits. Out-of-limits indications are dispalyed as 0o 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 E, 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.

and

+ 16 hidden pages

Metermann 37XR User Manual [en, de, fr, it]

Specifications and Main Features

Frequently Asked Questions

User Manual