ZOYI ZT-922S User manual

User Manual
All rights reserved.
Specifications are subject to change without notice.
User Manual
All rights reserved.
Specifications are subject to change without notice.

LIMITED WARRANTY
AND LIMITATION OF LIABILITY
Customers enjoy one-year warranty
from the date of purchase.
This warranty does not cover fuses,
disposable batteries, damage from
misuse accident, neglect, alteration,
contamination, or abnormal conditions
of operation or handling, including
failures caused by use outside of the
product's specifications, or normal wear
and tear of mechanical components.

Contents
Instruction.................................................................1
Safety Information....................................................1
Instrument Overview................................................3
LCD Display.............................................................3
Function Buttons......................................................5
Measurement Instruction.........................................7
Measure AC/DC Voltage..........................................7
Measure Resistance.................................................7
Test Continuity..........................................................8
Test Diodes...............................................................8
Measure Capacitance...............................................9
Measure Frequency/Duty Cycle................................10
NCV Test…………………………………………………10
Voice Recognition …………………………………...….10
Title Page

Maintenance.............................................................12
Clean the Product.....................................................12
Replace the Batteries................................................12
Specifications............................................................14
General Specifications..............................................14
Mechanical Specifications.........................................14
Environmental Specifications....................................15
Electrical Specifications.............................................16

Introduction
This product is a battery-powered, true RMS,
auto-range multi-function digital multimeter with
6000 counts LCD display and adjustable backlight
brightness.
Safety Information
To avoid possible electrical shock, fire, or
personal injury, please read all safety information
before you use the product. Please use the
product only as specified, or the protection
supplied by the product can be compromised.
•Examine the case before you use the product.
Look for cracks or missing plastic. Carefully look
at the insulation around the terminals.
•The measurement must be made with correct
input terminals and functions and within the
allowable measuring range.
1

•Do not use the product around explosive gas,
vapor, or in damp or wet environments.
•Keep fingers behind the finger guards on the
probes.
•When the product has already been connected
to the line being measured, do NOT touch the
input terminal that is not in service.
•Disconnect the test leads from the circuit before
changing the mode.
•When the voltage to be measured exceeds 36V
DC or 25V AC, the operator shall be careful
enough to avoid electric shock.
•Misuse of mode or range can lead to hazards,
be cautious. “ ” will be shown on the display
when the input is out of range.
•Low level of a battery will result in incorrect
readings. Change the batteries when battery
level is low.Do not make measurements when
the battery door is not properly placed.
2

3
LCD Display
Instrument Overview
①
Auto range
②
Voice recognition
③
DC
voltage
④
AC voltage
⑤
Negative display
⑥
Low battery. Replace batteries.
⑦
Temperature test.
(Fahrenheit or Celsius)
①
②
③
④
⑤
⑥
⑦
⑧
⑨
⑩
⑪
⑬
⑭
⑯
⑰
⑱
⑲
⑫
⑮
㉑

4
⑧
True RMS
⑨
Duty cycle
⑩
Frequency test. (Hertz)
⑪
Capacitance
test.(Farad)
⑫
Voltage
test.（volt）
⑬
Resistance test.(ohm)
⑭
Current test. (Ampere)
⑮
Display freezes present reading.
⑯
Display shows maximum reading.
⑰
Display shows minimum reading.
⑱
Continuity test.
⑲
Diode test.
⑳REL
The product measures both
sinusoidal and non sinusoidal
ac waveforms accurately.
㉑
MANU
Manual
range
Test unit

①
②
③
④
⑤
⑥
Function Buttons
①
Long
press to turn on/off the product.
•
The product automatically powers off
after
15 minutes of inactivity.
•
The built-in beeper beeps 5 times 1
minute
before auto power off.
•
To restart the product from auto power
off,
press the SELECT button or turn the
rotary
switch back to the OFF position and then to
a
needed position.
•
To disable the Auto Power Off function,
hold
down the SELECT button when turning
on
the product, you will hear five beeps if
you
have successfully disabled the function.
②
Press
this button, the main display will
show
current
frequency and the vice display will
show
the
duty cycle. Press it again to quit.
On
capacitance,
long press to clear the readings.
5

③
Push
once to hold the current reading on
the
display
; push again to continue
normal
operation
. Long press more than 2s to turn
on
backlight,
long press again to turn off it.
④
Press
this button to enter in DC
voltage
function,
press it to switch in DC and
AC
voltage
. When test AC voltage, vice
display
will
show frequency. When test DC
voltage,
vice
display will show regular temperature
.
Long
press temperature button to switch
in
Celsius
and Fahrenheit.
⑤
Push
this button to toggle between
testing
modes
of Resistance, Diode/Continuity,
and
Capacitance
. Vice display will show
regular
temperature
, now long press
temperature
button
to switch in Celsius and Fahrenheit .
⑥
Short
press to enter in voice
recognition
function,
then short press again to turn it off
.
Long
press more than 2s to enter in NCV
test
function,
then long press more than 2s to turn
it
off
. ( it will automatically turn off the
voice
recognition
function if no any operation in
2
minutes)
6

Measurements Instruction
Measure AC/DC Voltage
1. Press the button to enter voltage test, short
press to choose AC or DC Voltage range. Now, vice
display will show frequency when on AC mode; vice
display will show regular temperature when on DC mode.
2. Touch the probes to the correct test points of
the circuit to measure the voltage.
3. Read the measured voltage on the display.
Measure Resistance
1.Press button once to switch to resistance
range.
2. Use the probe pin to contact two sides of the
resistance.
3. Read the measured resistance on the display.
7
•Do not measure voltage that exceeds the extremes
as indicated in the Specifications.
•Do not touch high voltage circuit during
measurements.

Test for Continuity
1.Press button three times to enter in continuity
range.
2. Use the probe pin to contact two sides of the
circuit.
3. The built-in beeper will beep when the resistance
is lower than 50Ω, which indicates a short circuit.
Test Diodes
1. Press twice to enter in diode range.
2. Contact the read pin with the positive pole and
the black lead pin with the negative pole of the
diode.
3. Read the forward bias voltage value on the
display. 8
•Disconnect circuit power and discharge all
capacitors before you test resistance.
•Do not input voltage at this setting.
*Do not input voltage at this setting.

5. If the polarity of the test leads is reversed with diode
polarity or the diode is broken, the display reading
shows “ ”.
Measure Capacitance
1. Press button four times to enter in
capacitance range.
2. Contact the read pin with the positive pole and the
black lead pin with the negative pole of the diode.
3. Read the measured capacitance value on the
display once the reading is stable.
9
•Do not input voltage at this setting.
•Do not input voltage at this setting.
•Disconnect circuit power and discharge all
capacitors before you test diode.

Measure frequency and duty cycle.
1. Press to enter in frequency range (low voltage
and high frequency), now the vice display will show duty
cycle.
2. Touch the probes to the desired test points.
3.Read the measured frequency value on the display, read
the duty cycle value at the vice display.
Test NCV
1. Long press 2s to enter the NCV Mode, now the
vice display will show regular temperature.
2. Hold the product and move it around, the built-in beeper
will beep when the inner sensor detects AC voltage
nearby. The stronger the voltage is, the quicker the
beeper beeps.
Voice Recognition
This product has Voice Recognition function, the operation
as followings:
For example, when you want to test resistance ,
1. Firstly, press voice recognition button, enter in the mode,
10

11
the display will show “ ” flickeringly ,and the beeper
will beep once for a long time;
2. Speak “Hey, multimeter” to turn the voice recognition
mode on, the display will long-term show “ ” ,
and the beeper will shortly beep twice;
3. Speak “ resistance mode” to enter in resistance test mode;
4. Use the probe pin to contact two sides of the resistance;
5. Read the measured resistance on the display;
6. Voice recognition will close if no operation in 2 minutes, please
return from step 1 if you want to restart.
More voice recognition order
Test function order
Resistance RESISTANCE-MODE
Capacitance CAPACITANCE-MODE
Automatic recognition AUTO-MODE
DC voltage DIRECT-VOLTAGE-MODE
AC voltage ALTERNATING-VOLTAGE-MODE
Turn on
backlight/flashlight TURN-ON-LIGHT
Turn off
backlight/flashlight TURN-OFF-LIGHT
REL RELATIVE-VALUE
Cancel REL RELATIVE-VALUE-CANCEL
Hold DATA-HOLD
Cancel hold HOLD-CANCEL

Maintenance
Beyond replacing batteries and fuses, do not
attempt to repair or service the product unless you
are qualified to do so and have the relevant
calibration, performance test, and service
instructions.
Clean the Product
Wipe the product with a damp cloth and mild
detergent. Do not use abrasives or solvents. Dirt
or moisture in the terminals can affect readings.
*Remove the input signals before you clean the
product.
Replace the Batteries
When “ ” is shown on the display, batteries shall
be replaced as below:
1. Remove the test leads and turn off the product
before replacing the batteries.
12

2. Loosen the screw on the battery door and
remove the battery door.
3. Replace the used batteries with new batteries
of the same type.
4. Place the battery door back and fasten the
screw.
13

Specifications
14
General Specifications
Display（LCD）6000 counts
Ranging
Auto
Material
ABS+TPE
Update rate
3times/ second
True
RMS √
Data hold
√
Backlight
√
Low
battery Indicated √
Auto
power off
√
Mechanical Specifications
Dimension
125*81*23mm
Weight
170g（without batter）
Battery
type 1.5V AAA battery * 2
Warrantly
One year

15
Environmental Specifications
Operating
Temperature 0~40℃
Humidity ＜75%
Storage
Temperature -20~60℃
Humidity ＜80%

Electrical Specifications
Function Range
Resolution
Accuracy
DC voltage
（ V ）
6.000V
0.001V
±(0.5%+3)
60.00V
0.01V
600.0V
0.1V
DC voltage
（ mV ）
60.00mV
0.01mV
600.0mV
0.1mV
AC voltage
（ V ）
6.000V
0.001V
±(1.0%+3)
60.00V
0.01V
600.0V
0.1V
750.0V
0.1V
AC voltage
（ mV ）
60.00mV
0.01mV
600.0mV
0.1mV
16