REED ST-9919 User manual

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Model ST-9919
TRMS Digital Multimeter
Instruction
Manual

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Table of Contents
Safety .........................................................................................3-4
Features......................................................................................... 5
Specications.............................................................................5-8
Instrument Description ...............................................................8-9
Operating Instructions............................................................10-16
DC Voltage Measurement ......................................................... 10
AV Voltage Measurement .....................................................10-11
DC Current Measurement ......................................................... 11
AC Current Measurement ......................................................... 12
Resistance Measurement.......................................................... 13
Continuity Check....................................................................... 13
Diode Test................................................................................. 13
Temperature Measurement ....................................................... 14
Capacitance Measurement ....................................................... 14
Frequency Measurement .......................................................... 14
%4-20mA Measurement ........................................................... 15
Autoranging/Manual Range....................................................... 15
Max/Min ................................................................................... 15
Relative Mode........................................................................... 16
Display Backlight....................................................................... 16
Hold.......................................................................................... 16
Peak Hold ................................................................................. 16
Low Battery Indication .............................................................. 17
Auto Power Off ......................................................................... 17
Maintenance................................................................................ 17
Battery Replacement................................................................... 18
Replacing the Fuses.................................................................... 19

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Safety
This symbol adjacent to another symbol, terminal or
operating device indicates that the operator must refer to an
explanation in the Instruction Manual to avoid personal injury
or damage to the meter.
Indicates a potentially hazardous situation, which if not
avoided, could result in death or serious injury.
Indicates a potentially hazardous situation, which if not
avoided, may result damage to the product.
The terminal(s) so marked must not be connected to a circuit
point for which the voltage with respect to ground exceeds
(in this case) 1000 VAC or VDC.
 Thissymboladjacenttooneormoreterminalsidentiesthem
as being associated with ranges that may, in normal use, be
subject to particularly hazardous voltages. For maximum
safety, the meter and its test leads should not be handled when
these terminals are energized.
Indicates that a instrument is protected throughout by double
insulation or reinforced insulation.
IEC1010 Overvoltage Installation Category
Overvoltage Category I is equipment for connection to circuits for which
measures are taken. Examples include protected electronic circuits.
Overvoltage Category II is energy-consuming equipment to be supplied
fromthexedinstallation.Examplesincludehousehold,ofce,and
laboratory appliances.
Overvoltage Category IIIisequipmentinxedinstallations.
Examplesincludeswitchesinthexedinstallationandsomeequipment
forindustrialusewithpermanentconnectiontothexedinstallation.
Overvoltage Category IV is for use at the origin of the installation.
Examples include electricity meters and primary over-current protection
equipment.
continued ...
WARNING
CAUTION

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Warnings
This meter has been designed for safe use, but must be operated with
caution. The warnings listed below must be carefully followed for safe
operation.
1. NEVERapplyvoltageorcurrenttothemeterthatexceedsthespecied
maximum Input Protection Limits:
Function Maximum Input
V DC or V AC 1000VDC/AC RMS
mA AC/DC 500mA 1000V fast acting fuse
A AC/DC 10A 1000V fast acting fuse (20A for 30
seconds max every 15 minutes)
Frequency, Resistance, Capacitance,
Duty Cycle, Diode Test, Continuity
1000VDC/AC RMS
Temperature 1000VDC/AC RMS
Surge Protection: 8kV peak per IEC 61010
2. USE EXTREME CAUTION when working with high voltages
3. DO NOT measure voltage if the voltage on the “COM” input jack
exceeds 1000V ground
4. NEVER connect the meter leads across a voltage source while the
function switch is in the current, resistance, or diode mode. Doing so
can damage the meter
5. ALWAYSdischargeltercapacitorsinpowersuppliesanddisconnect
the power when making resistance or diode tests
6. ALWAYS turn off the power and disconnect the test leads before
opening the covers to replace the fuse or batteries
7. NEVER operate the meter unless the back cover and the battery and
fuse covers are in place and fastened securely
8.Iftheequipmentisusedinamannernotspeciedbythemanufacturer,
the protection provided by the equipment may be impaired

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Features
•TrueRMSAC/DCvoltageandcurrentmeasurements
•0.05%basicDCaccuracy
•40,000-countresolution
•Measuresfrequency,capacitanceandtemperature
•Diodecheckandcontinuitytest
•BacklitLCDreadoutwithanalogbargraph
•1000Vinputprotectiononallranges
•4-20mAprocessloopmeasurementswith%readout
•Datahold,Max/Minrecordingmode
•Peakcapturemode
•IP67dustandwaterproof
•EN61010-1Cat.IV600V,Cat.III1000V
•Includestestleadsand9Vbattery
Specifications
Function Range Resolution Accuracy
DC Voltage
400mV 0.01mV
±(0.06%reading+2digits)
4V 0.0001V
40V 0.001V
400V 0.01V
1000V 0.1V ±(0.1%reading+5digits)
AC Voltage
50 to 1000Hz
400mV 0.1mV ±(1.0%reading+5digits)
4V 0.001V
±(1.0%reading+3digits)
40V 0.01V
400V 0.1V
1000V 1V
AllACvoltagerangesarespeciedfrom5%ofrangeto100%
of range
DC Current
400μA 0.01μA
±(1.0%reading+3digits)
4000μA 0.1μA
40mA 0.001mA
400mA 0.01mA
10A 0.001A
(20A: 30 sec max with reduced accuracy)
continued ...

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AC Current
50 to 1000Hz
400μA 0.1μA
±(1.5%reading+3digits)
4000μA 1μA
40mA 0.01mA
400mA 0.1mA
10A 0.01A
(20A: 30 sec max with reduced accuracy)
AllACvoltagerangesarespeciedfrom5%ofrangeto
100%ofrange
NOTE:Accuracyisstatedat65oF to 83oF (18oC to 28oC)&lessthan75%RH
Function Range Resolution Accuracy
Resistance
400Ω 0.01Ω ±(0.3%reading+9digits)
4kΩ 0.0001kΩ
±(0.3%reading+4digits)
40kΩ 0.001kΩ
400kΩ 0.01kΩ
4MΩ 0.001MΩ
40MΩ 0.001MΩ ±(2.0%reading+10digits)
Capacitance
40nF 0.001nF ±(3.5%reading+40digits)
400nF 0.01nF
4μF 0.0001μF
±(3.5%reading+10digits)40μF 0.001μF
400μF 0.01μF
4000μF 0.1μF ±(5%reading+10digits)
40mF 0.001mF
Frequency
(electronic)
40Hz 0.001Hz
±(0.1%reading+1digits)
400Hz 0.01Hz
4kHz 0.0001kHz
40kHz 0.001kHz
400kHz 0.01kHz
4MHz 0.0001MHz
40MHz 0.001MHz
100MHz 0.01MHz Notspecied
Sensitivity:0.8Vrmsmin.@20%to80%dutycycleand
<100kHz;5Vrmsmin@20%to80%dutycycleand>100kHz.
Frequency
(electrical)
40.00-
400Hz 0.01Hz ±(0.5%reading)
Sensitivity: 15Vrms
Duty Cycle
0.1 to
99.90% 0.01% ±(1.2%reading+2digits)
Pulse width: 100μs - 100ms, Frequency: 5Hz to 150kHz
continued ...

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Temp (type-K)
-58 to
1832°F 1°F ±(1.0%reading+4.5°F)
±(1.0%reading+2.5°C)
(probe accuracy not included)
-50 to
1000°C 1°C
4-20mA% -25 to
125% 0.01% ±50 digits
0mA=-25%,4mA=0%,20mA=100%,24mA=125%
Note:Accuracyspecicationsconsistoftwoelements:
•(%reading)–Thisistheaccuracyofthemeasurementcircuit
•(+digits)–Thisistheaccuracyoftheanalogtodigitalconverter
Enclosure: Double molded, waterproof
Shock (Drop Test): 6.5 feet (2 meters)
Diode Test: Test current of 0.9mA maximum, open circuit
voltage 2.8V DC typical
Continuity Check: Audible signal will sound if the resistance is less
 than35Ω(approx.),testcurrent<0.35mA
Peak: Capturespeaks>1ms
Temperature Sensor: Requires type K thermocouple
InputImpedance: >10MΩVDC&>3MΩVAC
AC Response: True RMS
AC True RMS: The term stands for “Root-Mean-Square”,
which represents the method of calculation of
the voltage or current value.
Average responding multimeters are calibrated
to read correctly only on sine waves and they
will read inaccurately on non-sine wave or
distorted signals. True rms meters read
accurately on either type of signal
ACV Bandwidth: 50Hz to 1000Hz
CrestFactor: ≤3atfullscaleupto500V,decreasinglinearly
 to≤1.5at1000V
Display: 40,000 count backlit liquid crystal with bargraph
Overrange indication: “OL” is displayed
Auto Power Off: 15 minutes (approximately) with disable feature
Polarity: Automatic (no indication for positive); Minus (-)
sign for negative
Measurement Rate: 2 times per second, nominal continued ...

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Low Battery Indication: is displayed if battery voltage drops below
operating voltage
Battery: One9volt(NEDA1604)battery
Fuses: mA, μA ranges; 0.5A/1000V ceramic fast blow
A range; 10A/1000V ceramic fast blow
Operating Temperature: 41ºF to 104ºF (5ºC to 40ºC)
Storage Temperature: -4ºF to 140ºF (-20ºC to 60ºC)
OperatingHumidity: Max80%upto87ºF(31ºC)decreasinglinearly
 to50%at104ºF(40ºC)
StorageHumidity: <80%
Operating Altitude: 7000ft. (2000 meters) maximum
Weight: 0.753lb (342g) includind holster
Size : 7.36” x 3.2” x 2.0” (187 x 81 x 50mm)
(includes holster)
Safety: This meter is intended for origin of installation
use and protected, against the users, by double
 insulationperEN61010-1andIEC61010-12nd
Edition (2001) to Category IV 600V & Category
III 1000V; Pollution Degree 2. The meter
also meets UL 61010-1, 2nd Edition (2004),
 CAN/CSAC22.2No.61010-12ndEdition
(2004), & UL 61010B-2-031, 1st Edition (2003)
Instrument Description
1 - 40,000 count LCD display
2 - REL button
3-RANGEbutton
4 - MODE button
5 - Function switch
6 - mA, μA and 10A input jacks
7 - COM input jack
8 - Positive input jack
9 - HOLD and (Backlight) button
10 - PEAK button
11-MAX/MINbutton
Note:Tiltstandandbatterycompartmentareonbackofunit.

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Display Description
Continuity
Diode test
Battery status
n nano (10-9) (capacitance)
µmicro (10-6) (amps, cap)
mmilli (10-3) (volts, amps)
AAmps
kkilo (103) (ohms)
FFarads (capacitance)
Mmega (106) (ohms)
ΩOhms
PEAK Peak Hold
Hz Hertz (frequency)
VVolts
%Percent (duty ratio)
REL Relative
AC Alternating current
AUTO Autoranging
DC Direct current
HOLD Display hold
ºF Degrees Fahrenheit
ºC Degrees Centigrade
MAX Maximum
MIN Minimum

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Operating Instructions
WARNING:Riskofelectrocution.High-voltagecircuits,bothACandDC,
are very dangerous and should be measured with great care.
1. ALWAYS turn the function switch to the OFF position when the meter is
not in use
2. If “OL” appears in the display during a measurement, the value exceeds
the range you have selected. Change to a higher range
DC Voltage Measurement
CAUTION:DonotmeasureDCvoltagesifamotoronthecircuitis
beingswitchedONorOFF.Largevoltagesurgesmayoccurthatcan
damage the meter.
1. Set the function switch to the green VDC position
2. Insert the black test lead banana plug into the negative COM jack
Insert the red test lead banana plug into the positive V jack
3. Touch the black test probe tip to the negative side of the circuit
Touch the red test probe tip to the positive side of the circuit
4. Read the voltage in the display
AC Voltage (Frequency, Duty Cycle) Measurement
WARNING:RiskofElectrocution.Theprobetipsmaynotbelong
enough to contact the live parts inside some 240V outlets for
appliances because the contacts are recessed deep in the outlets.
As a result, the reading may show 0 volts when the outlet actually has
voltage on it. Make sure the probe tips are touching the metal contacts
inside the outlet before assuming that no voltage is present.
CAUTION:DonotmeasureACvoltagesifamotoronthecircuitis
beingswitchedONorOFF.Largevoltagesurgesmayoccurthatcan
damage the meter.
continued ...