Circuit-test DMR-1100A User manual

USER'S MANUAL
DMR-1100A
CIRCUIT-TEST ELECTRONICS
Digital Multimeter
www.circuittest.com

2
Your Circuit-Test DMR-1100A Digital Multimeter incorpo-
rates the latest technology to provide you with a feature
packed instrument. With it you can measure a wide range
of voltages, current and resistance in the lab, shop, car and
home. This product has been designed for the electrician,
technician and hobbyist.
INTRODUCTION
SAFETY INFORMATION
This meter conforms to IEC-61010 for Category I 600V and
pollution degree 2. This meter is designed for indoor use
only and proper guidelines must be followed for personal and
product safety. Per IEC1010 over installation category, equip-
ment of overvoltage Category I is equipment for connection
to circuits in which measures are taken to limit the transient
overvoltages to an appropriate low level. Examples include
protected electronic circuits. Note: Do not use this meter for
measurements within overvoltage Category II, III and IV.
SAFETY SYMBOLS
This symbol adjacent to another symbol, terminal
or operating device indicates that the operator must
refer to an explanation in the Operating Instructions
to avoid personal injury or damage to the meter.
This symbol adjacent to one or more terminals identi-
es them as being associated with ranges that may,
in normal use, be subjected to particularly hazardous
voltages. For maximum safety, the meter and its test
leads should not be handled when these terminals
are energized.

3
This symbol advises the user that the terminal(s)
so marked must not be connected to a circuit point
at which the voltage with respect to earth ground
exceeds (in this case) 600 VAC or VDC.
WARNING
1. Set the function switch correctly before making any
measurements.
2. Do not operate the unit unless the case is completely
closed.
3. Disconnect test leads from equipment before removing
the battery.
4. Never connect unit to AC or DC powered circuits when
function switch is set to Ω, diode check or continuity.
5. To safeguard against electrical shock or damage to
instrument, never connect to more than 600V DC or
600V AC between input jacks and ground.
6. Always inspect the instrument, test leads and other
accessories for damage prior to use.
7. Read this instruction manual carefully and completely
before using.
SAFETY PRECAUTIONS
High voltage AC and DC circuits are dangerous. Always
consider circuits to be energized. Never assume any equip-
ment is de-energized. Lack of caution or poor safety practices
can be very dangerous and/or lethal.

4
FEATURES
Diode Check - test diodes and other semiconductors for
open and short circuits.
Overload Protection - protects the meter from overvolt-
age.
Auto-Polarity - indication on display that polarity is
reversed.
Battery Test - 1.5V and 9V batteries.
FRONT PANEL
10
COM
VΩ mA
CAT I
600V
CIRCUIT-TEST
DMR-1100A
DIGITAL MULTIMETER
A
UNFUSED 10A MAX
For 10 sec. MAX
every 15 min.
FUSED
200mA 250V MAX
600V MAX
~
~
10A
600
200
2000
μ
20
m
200
m
9V
1.5V
BATT.
2000 200
20k
200
k
2000
k
200
m
20
200
600 OFF
V
~
Ω
A
V
2000
m
1. Function Switch - Select desired function and range and
to turn the meter ON and OFF.
2. LCD Display - 3 ½ Digit
3. COM Jack - Plug-in terminal for black test lead
4. VΩmA Jack - Plug-in terminal for red test lead, for
all measurements except DC current measurement ≥
200mA.
5. 10A Jack - Plug-in terminal for red test lead for DC cur-
rent measurement between 200mA to 10A. Note: There
is no fuse protection for this jack input.
1
3
4
5
2

5
SPECIFICATIONS
Display: 3.5 digit, 0.5" (12mm) H LCD
Ranging: Manual ranging
Polarity: Automatic, minus (-) sign indicates
negative polarity
Over range: "1" is displayed
Low Battery: " " or "BAT" indicates low battery
Input Impedance: 1M Ω (DCV/ACV)
Sampling Rate: About 2 to 3 times/sec.
Operation Temp.: 0 to 40oC
Storage Temp.: -10 to 50oC
Fuse: GMA 250mA/250V
Power Source: 1 - 9V Battery
Dimensions: 70(W) x 127(H) x 25(D)mm
Weight: 170g (including battery)
Note: Accuracy is stated at 65°F to 83°F (18°C to 28°C)
and less than 75% RH.
Accuracy is:
± ([ % of reading] + [Number of least signicant digits])
a. GENERAL
b. TECHNICAL

6
DC VOLTAGE
RANGE RESOLUTION ACCURACY
200mV 100μV ± (0.5% + 5)
2000mV 1mV
± (0.8% + 5)20V 10mV
200V 100mV
600V 1V ± (1.0% + 5)
Input Impedance: 1M Ω
Max. Allowable Input Voltage: 600V DC/AC rms
AC VOLTAGE
RANGE RESOLUTION ACCURACY
200V 100mV ± (1.2% + 10)
600V 1V
Input Impedance: 1M Ω
Frequency Response: 45Hz - 400Hz
Max. Allowable Input Voltage: 600V AC rms

7
DC CURRENT
RANGE RESOLUTION ACCURACY
2000μA 1μA ± (1.0% + 5)
20mA 10μA
200mA 100μA ± (1.2% + 5)
10A 10mA ± (2.0% + 5)
Overload Protection:
Fuse, 250mA/250V, Fast (for the "VΩ mA" terminal's
inputs only)
There is no fuse protection for the "10A" terminal's
inputs.
Max. Allowable Input Current: 10A
(For inputs > 2A : measurement duration < 10 secs,
interval > 15 minutes)
RESISTANCE
RANGE RESOLUTION ACCURACY
200Ω 0.1Ω ± (1.2% + 5)
2000Ω 1Ω
± (1.0% + 5)20kΩ 10Ω
200kΩ 100Ω
2000kΩ 1kΩ ± (1.2% + 5)
Max. Open Circuit Voltage: about 3V

8
DIODE AND CONTINUITY
RANGE DESCRIPTION
Test Voltage: about 2.8V
Test Current: about 1mA
The approximate forward voltage
drop in mV will be displayed.
The built-in buzzer will sound when
the resistance is less than about 50Ω
BATTERY TEST
RANGE DESCRIPTION TEST CONDITION
1.5V The working voltage
of the battery will
be displayed on the
LCD.
The working current
is about 20mA.
9V The working current
is about 5mA.

9
MEASUREMENTS
Please take a few minutes to read these instructions prior
to use.
1 DC VOLTAGE MEASUREMENT
WARNING: Maximum input is 600V DC.
1-1 Plug the red test lead into the V jack and the black test
lead into the COM jack.
1-2 Set the range switch to the desired position. It is best
to start with the highest range if the voltage is not known.
1-3 Attach the test leads to the circuit to be measured.
Ensure that the black lead is connected to the negative
side of the circuit and the red lead to the positive.
1-4 Read the displayed voltage.
1-5 If the minus(-) sign appears the voltage is negative at
the point being measured.
2 AC VOLTAGE MEASUREMENT
WARNING: Maximum input is 600V AC.
2-1 Plug the red test lead into the V jack and the black test
lead into the COM jack.
2-2 Set the range switch to the desired position. It is best
to start with the highest range if the voltage is not known.
2-3 Attach the test leads to the circuit to be measured.
2-4 Read the displayed voltage.

10
3 RESISTANCE MEASUREMENT
WARNING: Remove all power from the circuit being
tested when checking resistance. Discharge any charged
capacitors. Never connect the probes to any voltage
while the selector is set to OHM.
3-1 Plug the red test lead into the V jack and the black test
lead into the COM jack.
3-2 Set the range switch to the desired Ω position. If the
resistance is not known, set the switch to highest range
and reduce until a satisfactory reading is obtained.
3-3 Attach the test leads to the circuit.
3-4 Read the displayed resistance.
NOTE: For measurements > 1M Ω the meter may take a
few seconds to stabilize reading. This is normal for
high resistance measurements. When input is not
connected, i.e. open circuit, "1" will be displayed to
indicate over range.
4 DC CURRENT MEASUREMENT
WARNING: Remove all power from the circuit being
tested when checking current. When using 10A scale,
do not connect to circuit for more than 10 seconds.
4-1 Plug the red test lead into the mA jack and the black test
lead into the COM jack if the current to be measured is
less than 200mA. Insert the red test lead into the 10A
jack if current being measured is between 200mA and
10A.

11
4-2 Set the range switch to one of the current ranges. If
you are unsure of the amount of current being measured
set switch to the highest reading and reduce until a
satisfactory reading is obtained.
4-3 Remove power from the circuit that is to be measured.
Open up the circuit and connect the black lead to the
negative side and the red lead to the positive side of
the circuit so that the test leads are in series with the
load to be measured.
4-4 Apply power to the circuit.
4-5 Read the displayed current.
NOTE: If changing range switch to or from the 10A position
rst disconnect power and test leads from the circuit
being tested. Repeat the above steps using the correct
input jack and range switch position.
5 DIODE TEST
WARNING: Remove all power from the circuit being
tested when using the diode check. Discharge any
charged capacitors. Never connect the probes to any
voltage while the selector is set to .
5-1 Plug the red test lead into the V jack and the black test
lead into the COM jack.
5-2 Set the function switch to .

12
5-3 Connect the red test lead to the anode and the black test
lead to the cathode of the diode to be tested.
5-4 The approximate forward voltage drop of the diode will
be displayed in mV. If the connection is reversed “1”
will be displayed.
6 CONTINUITY TEST
7 BATTERY TEST
WARNING: Remove all power from the circuit being
tested when checking continuity. Discharge any charged
capacitors. Never connect the probes to any voltage
while the selector is set to .
6-1 Plug the black test lead into the COM jack and red test
lead into the V jack
6-2 Set the function switch to .
6-3 Connect the probes across the circuit to be measured.
6-4 If the resistance is lower than about 50Ω, the buzzer
will sound.
7-1 Plug the black test lead into the COM jack and red test
lead into the V jack
7-2 Set the function switch to desired BATT range position
(1.5V or 9V).
7-3 Connect the test leads to the two terminals of the battery
to be measured and note the reading.

13
Battery Good Weak Bad
9V > 8.2V 7.2 to 8.2V < 7.2V
1.5V > 1.35V 1.22 to 1.35V < 1.22V
MAINTENANCE
1 BATTERY REPLACEMENT
WARNING: Disconnect both test leads from any
equipment before removing back cover. Do not use the
meter with the case opened.
1-1 Disconnect both test leads and turn off the power.
1-2 Remove the screws in the rear cover of the case and
remove the cover.
1-3 Unsnap the battery from the connector and replace with
a new 9V battery.
1-4 Replace the cover and cover screws.
2 FUSE REPLACEMENT
WARNING: Disconnect both test leads from any
equipment before removing back cover. Do not use the
meter with the case opened.
2-1 Disconnect both test leads and turn off the power.
2-2 Remove the screws in the rear cover of the case and
remove the cover.

14
2-3 Replace the blown fuse with a GMA 250mA/250V fuse.
Do not use a fuse which has a higher rated value than
specied or try to bypass the fuse.
2-4 Replace the cover and cover screws.
LIMITED WARRANTY
Circuit-Test Electronics warrants to the original purchaser
that this product be free of defect in material or workmanship
for a period of 2 years from the date of purchase.
Any product which has been subjected to misuse or ac-
cidental damage is excluded from the warranty. Except as
stated above, Circuit-Test Electronics makes no promises or
warranties either expressed or implied including warranties
of merchantability or the tness for any particular purpose.
M-DMR-1100A / 07R13