TPI 190 Series User manual

Function Range Resolution
DCV 50mV 0.001mV
500mV 0.01mV
5V 0.0001V
50V 0.001V
500V 0.01V
1000V 0.1V
ACV 5V 0.0001V
50V 0.001V
500V 0.01V
750V 0.1V
DCA/ACA 500µA 0.01µA
5000µA 0.1µA
50mA 0.001mA
500mA 0.01mA
5A 0.0001mA
10A 0.001A
OHM 500Ω0.1Ω
5kΩ0.0001kΩ
50kΩ0.001kΩ
500kΩ0.01kΩ
5MΩ0.0001MΩ
50MΩ0.001MΩ
CAPACITANCE 5µF 0.001µF
(190,194) 50µF 0.01µF
500µF 0.1µF
5000µF 1µF
20mF 0.01mF
CAPACITANCE 100nF 0.1nF
(192) 1µF 0.001µF
10µF 0.01µF
100µF 0.1µF
Inductance 100mH 0.01mH
(Only192)
Frequency 50Hz 0.001Hz
500Hz 0.01Hz
5KHz 0.0001KHz
50KHz 0.001KHz
500KHz 0.01KHz
Test Voltage Test Current
Diode Approx. 3V Approx. 1mA
Test Voltage Threshold
Continuity Approx. 3V 300 Digits
Test Products International, Inc.
See pages 10~13 for detail specifications.
190 Specifications ±0.05% Basic DCV Accuracy
190 Series
Digital Multimeter
Instruction Manual

TABLE OF CONTENTS
page
A. INTRODUCTION
1. Congratulations··············· 3
2. Product Description ············ 3
3. EC Declaration of Conformity ······ 4
B. SAFETY CONSIDERATIONS ········· 5
C. TECHNICAL DATA
1. Features and Benefits ··········· 7
2. Product Applications ··········· 8
3. Specifications ················ 9
D. MEASUREMENT TECHNIQUES
1. Controls and Functions ········· 14
2. Power on Options ············· 15
3. Step by Step Procedures:
a) Measuring DC Volts ········· 17
b) Measuring AC Volts ········· 19
c) Measuring DC Amps ········· 20
d) Measuring AC Amps ········· 22
e) Measuring Resistance ········ 23
f) Measuring Diodes··········· 24
g) Continuity Buzzer ··········· 25
h) Measuring Capacitance ······· 26
i) Measuring Inductance ········ 27
j) Measuring Frequency ········ 27
k) Record Mode·············· 28
l) Compare Mode ············ 29
m) Relative %Mode ············ 30
n) Two-Hold System ··········· 31
o) RS-232C interface ·········· 32
E. ACCESSORIES ················· 35
F. MAINTENANCE ················· 36
G. TROUBLE SHOOTING GUIDE ········ 37
2

3. EC Declaration of Conformity
This is to certify that model DMM 190 conforms to the
protection requirement of the council directive 89/336/EEC,
in the approximation of laws of the member states relating to
Electromagnetic compatibility and 73/23/EEC, the low
voltage Directive by application of the following standards:
EN 50081-1 1992 Emissions standard
EN 50082-1 1992 Immunity standard
EN 61010-1 1993 Safety standard
EN 61010-2-031 1995 Safety standard
To ensure conformity with these standards, this instruction
must be operated in accordance with the instruction and
specifications given in this manual.
CAUTION:
Even though this instrument complies with the
immunity standards, the accuracy can be affected by
strong radio emissions not covered in the above
standards. Sources such as hand held radio
transceivers, radio and TV transmitters, vehicle
radios and cellular phones generate electromagnetic
radiation that could be induced into the test leads of
the instrument. Care should be taken to avoid such
situations or alternatively, check to make sure that
the instrument is not being influenced by these
emissions.
4
A. INTRODUCTION
INTRODUCTION
1. Congratulations!!
Thank you for purchasing a TPI Digital Multimeter. The
Triple Display is an innovative new concept in DMM design.
The unique display enables you to view more than one event
at a time. This eliminates the hassle of switching back and
forth to review minimum, maximum or preset comparative
values. The meter is also easy to use and built to last.
2. Production Description
The meter is a hand-held autoranging DMM. The backlit LCD
can display three readings at one time. In addition to basic
function of AC/DC V, AC/DC A, Ohm, Diode test,
Inductance(Only192), continuity, Capacitance, Frequency,
there is the adaptor function. The meter also has RS232
output and software for recording information into a PC.
The meter also features:
• REC Records Min/Max and Average readings during
specified measurement intervals.
• COMP Compare actual reading to preset HI and LOW
value for Pass/Fail testing of component.
• HOLD Tow hold system automatically holds the previous
stable reading when a new one is obtained.
The meter comes complete with the following accessories:
Battery
Rubber Boot
Test Lead Set
Instruction Manual
3

INTERNATION SYMBOLS
CAUTION: RISK OF ELECTRIC SHOCK
AC (ALTERNATING CURRENT)
DC (DIRECT CURRENT)
REFER TO INSTRUCTION MANUAL
GROUND
FUSE
DOUBLE INSULATION
6
B. SAFETY CONSIDERATIONS
WARNING!: Please follow manufacturers test
procedures whenever possible. Do not attempt to
measure unknown voltages or components until a
complete understanding of the circuit is obtained.
GENERAL GUIDELINES
ALWAYS
•Test the meter before using to make sure it is operating
property.
•Inspect the test leads before using to make sure there are
no breaks or shorts.
•Double-check all connections before testing.
•Have someone check on you periodically if working alone.
•Have a complete understanding of the circuit under test.
•Disconnect power to circuit, and then connect test leads to
the meter, and then to circuit being measured.
NEVER
•Attempt to measure unknown high voltage.
•Attempt to measure current with the meter in parallel to
the circuit.
•Connect to the test leads to a live circuit before setting up
the instrument.
•Touch any exposed metal part of the test lead assembly.
5

2. Product Applications
Perform the following tests and/or measurements with the
meter and the appropriate function:
HVAC/R
DC mV • Gas application.
ACA • Heat anticipator current in thermostats.
ACV • Line voltage.
ACV or DCV • Control circuit voltage.
DcuA • Flame safeguard control current.
OHMS • Heating element resistance (continuity).
OHMS • Compressor winding resistance.
OHMS • Contactor and relay coil resistance.
OHMS • Continuity of wiring.
Hz/FREQ • Frequency of line and control voltage.
CAP • Motor start and run capacitance.
REC • Record min/max voltage of controls and line
voltages.
ELECTRICAL
ACV • Measure line voltage.
OHMS • Continuity of circuit breakers.
Hz/FREQ • Frequency of line and control voltage.
DCV • Voltage of direct drive DC motors.
ELECTRONIC
ACV • Measure power supply voltage.
OHMS • Continuity of circuit breakers.
REL% • Match components
COMP • Compare readings in circuit or components
Hz/FREQ • Frequency of line and control voltage.
8
C. TECHNICAL DATA
1. Features and benefits
Safety Meets CE and IEC 1010 requirements. UL
Listed to U.S. and Canadian Safety
Standards.
True RMS Needed to accurately measure non-
sinusoidal AC voltage and current
waveforms found on many controls and
circuits.
Triple Display Shows more than one reading
simultaneously.
Two-Hold Holds two readings on the display at
System thesame time.
Auto Power Off Automatically powers instrument down
after 15 minutes of inactivity, yet will
continue acquiring data in its various
modes.
Record Records Min/Max and Average values
Compare Compares stored value with measured
value for matching components.
Relative Displays measured value as a % of stored
Percentage value for checking component tolerances.
RS232 Output Transfers data directly to a PC while
measuring.
Back Light Allows viewing in any light condition.
Auto range Automatically selects the best range for
the measurement.
7

3. Specifications (cont.)
General Specifications
10
3. Specifications
IEC 1010 Over Voltage: (190, 192)
CAT II-1000VDC, 750VAC
CATIII-600V
Pollution Degree 2
EC 1010 Over Voltage: (194)
CATIII-1000V
CATIV-600V
Pollution Degree 2
※INSTALLATION I·II·III
INSTALLATION CATEGORY(OVERVOLTAGE CATEGORY) I:
Signal level, special equipment or parts of equipment, telecommunication, electronic
etc., with smaller transient overvoltages than INSTALLATION CATEGORY II.
INSTALLATION CATEGORY(OVERVOLTAGE CATEGORY) II :
Local level, appliances, PORTABLE EQUIPMENT etc., with smaller transient overvoltages than
INSTALLATION CATEGORY III.
INSTALLATION CATEGORY(OVERVOLTAGE CATEGORY) III :
Distribution level, fixed installation, with smaller transient overvoltages than
INSTALLTION CATEGORY IV.
9
a1. DCmV
Range Resolution Accuracy Impedance
50mV 0.001mV +/-0.1% of reading, +/- 10digits
500mV 0.01mV
b1. ACV(45Hz to 450Hz)
Range Resolution Accuracy Impedance
5V 0.0001V +/-0.4% of reading, +/- 40digits 10MΩ
50V 0.001V
500V 0.01V
1000V 0.1V
b2. ACV(450Hz to 5KHz)
Range Resolution Accuracy Impedance
5V 0.0001V Unspecified 10MΩ
50V 0.001V +/-1.5% of reading, +/- 40digits
500V 0.01V
1000V 0.1V
a. DCV
Range Resolution Accuracy Impedance
5V 0.0001V +/-0.05% of reading, 10MΩ
50V 0.001V +/- 4digits
500V 0.01V
1000V 0.1V +/-0.1% of reading, +/- 10digits
b3. ACV(5KHz to 20KHz)
Range Resolution Accuracy Impedance
5V 0.0001V Unspecified 10MΩ
50V 0.001V +/-2.0% of reading, +/- 40digits
500V 0.01V
1000V 0.1V Unspecified

3. Specifications (cont.)
Capacitance is max. 5000 counts
12
3. Specifications (cont.)
11
e. OHM(Resistance)
Range Resolution Accuracy Overload
protection
500Ω0.01Ω+/-0.05% of reading, 600V DC or AC
5KΩ0.0001KΩ+/- 5digits peak
50KΩ0.001KΩ1000V DC or AC
500KΩ0.01KΩpeak(Only194)
5MΩ0.0001MΩ+/-1.0% of reading,
50MΩ0.001MΩ+/- 10digits
f. Diode test
Range Resolution Accuracy Overload protection
3V Approx. 1mA 600V DC or AC peak
1000V DC or AC peak
(Only 194)
c. DCA
Range Resolution Accuracy Overload
protection
500uA 0.01uA +/-0.5% of reading, Fuse(fast blow)
5000uA 0.1uA +/- 5digits F600V, 0.5A 31CM
5000uA 0.1uA F1000V, 0.44A
50mA 0.001mA (Only 194)
500mA 0.01mA
5A 0.0001A +/-0.75% of reading, Fuse(fast blow)
+/- 5digits F600V, 10A 31CM
10A 0.001A F1000V, 11A
(Only 194)
d. ACA
Range Resolution Accuracy Overload
protection
500uA 0.01uA +/-0.75% of reading, Fuse(fast blow)
5000uA 0.1uA +/- 5digits F600V, 0.5A 31CM
50mA 0.001mA F1000V, 0.44A
500mA 0.01mA (Only194)
5A 0.0001A +/-1.5% of reading, Fuse(fast blow)
+/- 5digits F600V, 10A 31CM
10A 0.001A F1000V, 11A
(Only194)
g. Continuity Buzzer
Test voltage Threshold Overload protection
3V 30digits 600V DC or AC peak
1000V DC or AC peak
(Only 194)
i. Inductance (Only 192)
Range Resolution Accuracy
100mH 0.01mH +/-5% of reading, 50digits
h. Capacitance (190, 194)
Range Resolution Accuracy Overload
protection
5uF 0.001uF +/-2.0% of reading, +/- 10digits
50uF 0.01uF
500uF 0.1uF
5000uF 1uF
20mF 0.01mF +/-7.0% of reading, +/- 10digits
h-1. Capacitance (192)
Range Resolution Accuracy
100nF 0.1nF +/-2.0% of reading, +/- 10digits
1uF 0.001uF
10uF 0.01uF
100uF 0.1uF (Max 120uF)

D. MEASUREMENT TECHNIQUES
1. Controls and function:
Push Button
RANGE Activates manual range
REC Activates the Min/Max/Avg mode.
REL % Activates REL% mode.
EDIT Activates the EDIT mode for the compare
and relative % function.
Activates Back light for the
LCD(Automatically turns off after approx.
35 sec.)
COMP Activates Compare mode.
HOLD Activates tow-hold data hold mode
Rotary Switch
OFF Turns the instrument off.
Selects the DC mV function
Selects the DCV function
Selects the ACV function
Selects the DCV function
(Push ORANGE button to activate ACV)
(Only192)
Selects the Diode test function
Selects the Ohm function (Push ORANGE
button to activate continuity buzzer.)
CAP Selects the Capacitance function
14
3. Specifications (cont.)
13
j. frequency
Range Resolution Accuracy Overload protection
50Hz 0.001Hz
500Hz 0.01Hz +/-0.05% of reading, 600V DC or AC
5Khz 0.0001Khz +/- 5digits peak
50Khz 0.001Khz
500Khz 0.01Khz
k. Adaptor
Model Display
A301(Temp Adaptor C/F) 1mV/C, 1mV/F 0000.0 C/F
A254(Current Adaptor 10/60A) 100mV/A, 00.000A
10mV/A 000.00A
A256(Current Adaptor 40/400A) 1mV/A 0000.0A
A296(Current Adaptor 400/1000A) 1mV/A 0000.0A
l. General Specifications
Max. volt. between 1000V
any input and Ground
Fuse protection mA : 0.5A/600VAC; A : 10A/600VAC
[ mA : 0.44A/1000VAC; A : 11A/1000VAC(Only 194) ]
Display Type Digital : 50000 count, 4 times/S update Bar
graph : 51 segment
Operating temp. 0°C to 40 °C (32°F to 113°F)
Storage Temp. -20°C to 60°C (-4°F to 140°F)
Relative Humidity 0% to 80% ( 0° ~ 35 °C/ 32° ~ 95°F)
0% to 70% ( 35° ~ 55 °C/ 95° ~ 131°F)
Power Supply 9Volt battery
Battery Life
Size(H x L x W)
Weight

1615
Application Notes
When measuring DC Voltage of a battery, the
most accurate reading can be attained by
testing the battery under load. To accomplish
this, follow steps 1 through 4 above and the
following (with the battery in holder and device
turned on):
•Connect the red test lead from the meter to
the positive (+) terminal of the battery.
•Connect the black test lead to the negative
(-) terminal of the battery.
•Reconnect power to the circuit and read the
voltage on the 190.
Selects the Inductance function
Selects the Frequency function
Selects the DC uA function (Push ORANGE
button to activate AC uA.
Selects the DC mA function (Push
ORANGE button to activate AC mA.)
Selects the DC A function (Push ORANGE
button to activate AC A.)
Adaptor Can use A254, A256, A296 and A301
(Push ORANGE button to activate AC
adaptor, and push RANGE button to
choose kind of adaptor)
Input Jacks
V/Ohm Red test lead connection for all Volt, Ohm,
Diode, and Continuity measurement.
COM Black test lead connection for all functions.
uA/mA Red test lead connection for current
measurement on the AC/DC uA and AC/DC
mA.
ARed test lead connection for current
measurement on the AC/DC A.
RS-232 See section on RS-232C interface
2. Power on Options:
Disable Auto Off Hold down the REC button while
turning on the instrument.

1817
Application Notes
Disconnect power from the terminal
block, find the fuse or circuit breaker
that controls the block and turn it
off.
Set up the meter following the
steps under “Measurement
Procedure” on page 13. Then proceed with the
following:
•Connect the red test lead to the hot side of the
block and the black lead to the neutral side of the
block. Reconnect power to the block and read the
voltage on the meter. The reading should be
approximately 110V to 130V.
•Disconnect power from the block and move the
red wire to ground. Reconnect power to the block
and read the voltage on the meter. Typically less
than 20V should exist from neutral to ground. If
110V or above exists, the block may be wired
incorrectly.
3. Step by step procedure
a. Measuring DC Volts
CAUTION
Do not attempt to make a voltage measurement if a test
lead is plugged in the A or mA input jack. Instrument
damage and/or personal injury may result.
WARNING!
Do not attempt to make a voltage measurement of more
than 1000V or of voltage level that is unknown.
Instrument set-up:
FUNCTION BLACK RED MINIMUM MAXIMUM
TEST LEAD TEST LEAD READING READING
COM VΩ0.001mV 500.00mV
COM VΩ0.0001V 1000.0mV
Measurement Procedure:
1. Disconnect power to circuit to be measured.
2. Plug black test lead into the COM input jack.
3. Plug red test lead into the input jack.
4. Set rotary switch to either the or range,
depending on the voltage to be measured.
5. Connect test leads to circuit to be measured.
6. Reconnect power to circuit to be measured.
7. Read the voltage on the LCD.

2019
c. Measuring DC Amps
CAUTION
Do not attempt to make a current measurement with the
test leads connected in parallel with the circuit to be
tested. Test leads must be connected in series with the
circuit.
WARNING!
Do not attempt to make a current measurement of circuits
with more than 600V(1000V-Only 194) present. Instrument
damage and/or personal injury may result.
Instrument set-up:
FUNCTION BLACK RED MINIMUM MAXIMUM
TEST LEAD TEST LEAD READING READING
COM mA 0.001mA 500.00mA
COM A 0.0001A 10.000A
Measurement Procedure:
1. Disconnect power to circuit to be measured.
2. Plug black test lead into the COM input jack.
3. Plug red test lead into the or input jack
depending on the value of current to be measured.
4. Set the rotary switch to the or function.
5. Connect the test leads in series to the circuit to be
measured.
6. Reconnect power to circuit to be measured.
7. Read the current on the LCD.
b. Measuring AC Volts
CAUTION
Do not attempt to make a voltage measurement if a test
lead is plugged in the A or umA input jack. Instrument
damage and/or personal injury may result.
WARNING!
Do not attempt to make a voltage measurement of more
than 750V(1000V-Only 194) or of a voltage level than is
unknown.
Instrument set-up:
FUNCTION BLACK RED MINIMUM MAXIMUM
TEST LEAD TEST LEAD READING READING
COM 0.0001V 750.0V
1000V(Only 194)
Measurement Procedure:
1. Disconnect power to circuit to be measured.
2. Plug black test lead into COM input jack.
3. Plug red test lead into the input jack.
4. Set the rotary switch to the function depending on the
voltage to be easured.
5. Connect test leads to circuit to be measured.
6. Reconnect power to circuit to be measured.
7. Read the voltage on the LCD.

2221
d. Measuring AC Amps
CAUTION
Do not attempt to make a current measurement with the
test leads connected in parallel with the circuit to be
tested. Test leads must be connected in series with the
circuit.
WARNING!
Do not attempt to make a current measurement of circuits
with more than 600V (1000V-Only 194)present. Instrument
damage and/or personal injury may result.
Instrument set-up:
FUNCTION BLACK RED MINIMUM MAXIMUM
TEST LEAD TEST LEAD READING READING
COM mA 0.001mA 500.00mA
COM A 0.0001A 10.000A
Measurement Procedure:
1. Disconnect power to circuit to be measured.
2. Plug black test lead into the COM input jack.
3. Plug the red test into the or input jack depending
on the value of current to be measured.
4. Set the rotary switch to the or function.
5. Connect test leads in series to circuit to be measured.
6. Reconnect power to circuit to be measured.
7. Read the current on the LCD.
Application Notes
When measuring the DC current of a
flame controller, follow the steps
under “Measurement Procedure”
above and then proceed with the
following:
•Set up the meter for
making a µA measurement.
•Connect the meter to the flame
controller lead by opening the
circuit and inserting the leads in
series with the circuit as shown
in the picture above.

2423
f. Measuring Diodes
CAUTION
Do not attempt to make diode measurements with circuit
energized. The only way to accurately test a diode is to
remove it completely from the circuit before attempting to
measure it.
Instrument set-up:
FUNCTION BLACK RED MINIMUM MAXIMUM
TEST LEAD TEST LEAD READING READING
COM 0.001V 2.0000V
Measurement Procedure:
1. Disconnect power to circuit to be measured.
2. Plug black test lead into the COM input jack.
3. Plug red test lead into input jack.
4. Set the rotary switch to the function.
5. Connect the black test lead to the banded end of the diode
and the red test lead to the non-banded end of the diode.
6. Reading on the display should be between 0.5 and 0.8
volts.
7. Reading test lead connections in 5 above.
8. Reading on the display should be OFL(Overflow).
NOTE: If diode reads 0 in both directions, diode is
shorted. If diode reads OFL in both directions, diode
is open.
e. Measuring Resistance
WARNING!
Do not attempt to make resistance measurements with
circuit energized. For best results, remove the resistor
completely from the circuit before attempting to measure
it.
NOTE:
To make accurate low ohm measurements, short the ends
of test leads together and record the resistance reading.
Deduct this value from actual readings.
Instrument set-up:
FUNCTION BLACK RED MINIMUM MAXIMUM
TEST LEAD TEST LEAD READING READING
COM 0.01Ω50.000MΩ
Measurement Procedure:
1. Disconnect power to circuit to be measured.
2. Plug black test lead into the COM input jack.
3. Plug red test lead into input jack.
4. Set the rotary switch on the DMM to the function.
5.Connect the test leads to the circuit to be measured.
6. Read the resistance value on the LCD.

2625
g. Continuity Buzzer
WARNING!
Do not attempt to make continuity measurements with
circuit energized.
IInstrument set-up:
FUNCTION BLACK TEST LEAD RED TEST LEAD
COM
Measurement Procedure:
1. Disconnect power to circuit to be measured.
2. Plug black test lead into the COM input jack.
3. Plug red test lead into the input jack.
4. Set the rotary switch to the function.
5. Press the yellow push button to activate the continuity
buzzer.
6. Connect test leads to circuit to be measured.
7. Listen for the buzzer to confirm continuity.
h. Measuring Capacitance
WARNING!
All capacitance measurements are to be made on de-
energized circuit with all capacitors
Discharged only. Failure to de-energize and discharge
capacitors before attempting to measure them could result
in instrument damage and/or personal injury.
FUNCTION BLACK RED MINIMUM MAXIMUM
TEST LEAD TEST LEAD READING READING
COM 0.001uF 20.00mF
0.1nF 120.0uF(Only 192)
Measurement Procedure:
1. Disconnect power to circuit to be measured.
2. Remove capacitor from the circuit and discharge it.
3. Plug black test lead into the COM input jack.
4. Plug the red test lead into the input jack.
5. Set the rotary switch to the function.
6. Connect test leads to capacitor to be measured.
7. Read the capacitor value on the LCD.

28
j. Measuring Frequency
WARNING!
Never attempt a frequency measurement with a voltage
source greater than 600V. (1000V-Only 194)Determine the
voltage of any unknown frequency source before
connecting the instrument in frequency source before
connecting the instrument in frequency mode.
FUNCTION BLACK RED MINIMUM MAXIMUM
TEST LEAD TEST LEAD READING READING
COM 0.01Hz 500.00KHz
Measurement Procedure:
1. Disconnect power to circuit to be measured.
2. Plug black test lead into the COM input jack.
3. Plug red test lead into the input jack.
4. Set the rotary switch to the function.
5. Reconnect power to circuit to be measured.
6. Read the frequency on the LCD.
27
i. Measuring Inductance (Only 192)
FUNCTION BLACK RED MINIMUM MAXIMUM
TEST LEAD TEST LEAD READING READING
mH COM umAmH 0.01mH 120.00mH
Measurement Procedure:
1. Disconnect power to circuit to be measured.
2. Plug black test lead into the COM input jack.
3. Plug red test lead into the input jack.
4. Set the rotary switch to the DMM 192 to the function.
5. Connect the test leads to the circruit to be measured.
6. Read the Inductance value on the LCD.

3029
l. Compare Mode
The compare mode takes the actual reading on the main
display and compares it to LOW and HIGH values,
programmed by the user, on the sub-displays. This is used
to compare components or measurements for acceptable
readings. Activate the function as follows:
1. To use Compare Mode manually select the correct
range for the function.
2. Depress the COMP button.
3. Depress the EDIT button the right hand digit under the
HIGH sub-display will start to flash.
4. Depress the REL% or HOLD buttons until the correct
number is selected for the position.
5. Depress the REC button. The next digit to the right of 3
above will start to flash.
6. Repeat steps 4 and 5 until the correct values for all eight
digits under LOW and HIGH sub-display are entered.
7. After the correct LOW and HIGH values are entered,
depress the EDIT button.
8. Measure the circuit or component being compared to the
programmed values. Results will be displayed as PASS
for the acceptable readings, LO for low readings, and HI
for high readings.
9. Depress the COMP button or turn the rotary switch to exit
the function.
k. Record Mode
The record mode saves minimum (MIN) and maximum
(MAX) values measured for a series of readings. The main
part of the LCD displays the actual reading, the MAX value is
constantly displayed on the lower left hand sub-display while
the MIN value is constantly displayed on the lower right
hand sub-display. Activate the function as follows:
1. Depress the REC button on the meter.
2. The meter will immediately start to record and display
MIN/MAX values on the two lower sub-displays.
3. Press REC button a second time and the AVG(average)
reading will be displayed.
4. Press the REC button again to return to normal record
mode.

32
o. RS-232C interface
Demonstration software is provided with the DMM. The
program is written for windows using MFC. For you own
applications, consult the following;
1. Specification
Baud rate 19200 baud
Parity none
Data length 8 bit
Stop bit 1 bit
2. Transmitte format(DMM to PC)
Output and Input of all data are ASCII String.
Send Format( DMM to PC )
“fun b sign value b unit b cr lf”
fun Function(ASCII code)
b blank(0x20)
Sign -(0x2E)/ (0x20)
Value Measured value(ASCII string)
unit Unit(ASCII string)
cr Carriage Return
lf Line Feed
Function code
Function Function code Unit
DCmV DCV mV
DCV DCV V
ACV ACV V
Diode DIO V
Ohm/Continuity OHM/BEP Ohm/ Kohm/ Mohm
Capacitance CAP uF/mF
Frequency FRQ Hz/ Khz
uA DCA/ACA uA
mA DCA/ACA mA
ADCA/ACA A
Adaptor AC/DC1,2,3 TMP A/ tC/ tF
Inductance IND mH
31
m. Relative % Mode
The Relative % mode takes the actual reading on the main
display and compares it to a reference value programmed by
the user on the right hand sub-display. The left hand sub-
display will show the percentage the actual reading varies
from the reference value. Activate the function as follows:
1. To use Relative % mode manually select the range for
the function.
2. Depress the REL% button.
3. Depress the EDIT button. The right hand digit under the
REF sub-display will start to flash.
4. Depress REL% or HOLD buttons until correct number is
selected for that display position.
5. Depress the REC button. The next digit to the right of 3
above will start to flash.
6. Repeat steps 4 and 5 until correct values for all four digits
under REF sub-display are entered.
7. After the correct REF value is entered, depress the EDIT
button.
8. Measure the circuit or component being compared to the
programmed reference value. Results will be displayed as
a percentage in the lower left hand left hand sub-display.
9. Depress the REL% button or turn the rotary switch to exit
the function.
n. Two-Hold System
The two-hold system is a data hold feature that will
automatically store a stable reading under the 1 HOLD sub-
display in the lower left hand corner of the LCD. When a
new, stable reading is obtained, the reading under 1 HOLD
will be moved to 2 HOLD and the new reading will be
displayed under 1 HOLD
Depress the HOLD button to activate the feature.
Push the button again to de-activate the feature.

REC OFF Deactivates Record mode
COMP ON ref1 ref2 Activates COMP.(If value is input
on the meter uses these as high &
low limit of compare)
COMP OFF Deactivates COMP mode
HOLD ON Activates HOLD mode
HOLD OFF Deactivates HOLD mode
SKEY f Indicates status of the function f is REL,
REC, COMP, HOLD, RANGE.
DMM STOP Set the RS-232C to stop mode.
DMM GO Set the RS-232C to start mode.
DMM SINGLE Output only one single data( one string )
on the DMM(you can keep getting data by
using this command)
3433
Push button code
Push key Code
RANGE RANGE AUTO/ RANGE MANUAL
REC REC ON/ REC AVG/ REC OFF
REL REL ON ref2/ REL OFF
COMP COMP ON ref1 ref2/ COMP OFF
HOLD HOLD ON/ HOLD OFF
★) ref1 is the sub display on the left lower part of the LCD,
ref2 is the sub display value on the right lower part of the
LCD.
ex)“1 DCV 12.345 mV HIGH 10.000 11.000 crlf”
:“1”indicates the push button is being operated and
mean the DCV function. The real value is 12.345mV. The
main display shows“HI”. The left lower part of the LCD
shows 10.000mV and the right lower part of the LCD
shows 11.000mV.
“2 DCV -1.2345 mV crlf”
:“2”indicates the push button is being off and Outputs
the value being displayed on the Main display.
“3 REL ON crlf”
: Indicates the REL % key is being pressed.
Receive Format( PC to DMM )
REL ON ref2 Activates REL %.(If the value is input on
ref2, it sets with value)
REL OFF Deactivates REL %
REC ON Activates the record mode to the normal
mode.
REC AVG Activates the record mode to the AVG
mode.

F. MAINTENANCE
1. Battery Replacement: The meter will display AT when
the 9 volt battery needs replacement. Battery replaced as
following:
a. Disconnect and remove all test leads from live circuit
and from the meter.
b. Remove the meter from protective boot.
c. Remove the three screws from battery cover of back
d. Remove old batteries and replace with new batteries.
e. Reassemble instrument in reverse order from above.
2. Fuse Replacement: Both the A and mA/uA input jacks
are fuse protected. Use only Fast blow, 600V fuses with
correct current ratings. Failure to do so will void all
Warranties. If either do not function, replace as Following:
a. Disconnect and remove all test leads from live circuit
and from the meter.
b. Remove the meter from protective boot.
c. Remove the three screws from battery cover of back
d. Remove old fuse(s) and replace it with new fuse(s).
e. Reassemble instrument in reverse order from above.
f. Fuse must be changed by replacement in service center.
3.Cleaning your Meter
Use a mild detergent and a slightly damp cloth to clean the
surfaces of the meter.
36
E. ACCESSORIES
35
Standard Accessories Part NO.
9 Volt Alkaline Battery
Fuse 0.5A Fuse 0.44A(Only194)
Fuse 10A Fuse 11A(Only194)
Test lead
Rubber boot
Optional Accessories
Accessories Part NO.
Demonstration Software
Deluxe Test lead set
IEC 1010 Deluxe test lead kit
Temperature Adaptor A301
Current Adaptor 10/60A A254
Current Adaptor 40/400A A256
Current Adaptor 400/1000A A296
Carrying case

G. TROUBLE SHOOTING GUIDE
Problem Probable Causes
Does not power up
•Dead or defective battery
•Broken wire from battery
snap to PCB
Won’t display current readings
•Open fuse
• Open test lead
•Improperly connected to
circuit under test
All functions except ohms read high
•Very weak battery that will
not turn on the low battery
indicator on the LCD
ACV do not read
•Very weak battery that will
not turn on the low battery
indicator on the LCD
WARRANTY
Please refer to product warranty card for warranty
statement.
37
Test Products International, Inc.
9615 SW Allen Blvd., Ste. 104
Beaverton, OR USA 97005
503-520-9197 • Fax: [phone] •[email protected]
Test Products International, Ltd.
2 Newcourt Business Park
Perry Road Harlow, Essex CM18 7PR England
Tel: [phone] • Fax: [phone]
L190 • 1/26/04 copyright ⓒ2004 Test Products International, Inc.