Delton 850A User manual

TABLE OF CONTENTS
1.Ation safety inform safety symbols...................................1/6
2.Specifications...................................................................6/17
3.Operation........................................................................17/20
4.Battery replacement........................................................20/21
5.Maintenance........................................................................21

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1. ATION SAFETY INFORM SAFETY SYMBOLS
Warning! Dangerous Voltage (Risk of electric shock).
Caution! Refer to the user’s manual before using this Meter.
Double Insulation (Protection Class Ⅱ).
Alternating Current (AC)
Direct Current (DC).
Either DC or AC.
Ground (maximum permitted voltage between terminal and
ground).
The symbol indicating separate collection for electrical and
electronic equipment.
The RESPONSIBLE BODY shall be made aware that, if the
instrument is used in a manner not specified by the
manufacturer, the protection provided by the instrument may
be impaired.
The finger or any part of your body shall not be beyond
the barrier of the test probe when measuring.
Individual protective equipment must be used if
HAZARDOUS LIVE parts in the installation where
measurement is to be carried out could be ACCESSIBLE.
Not to use the CURRENT SENSOR if the wear indicator in
the JAW OPENING is visible.
The following safety information must be observed to insure
maximum personal safety during the operation at this meter.

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1.1 Do not operate the meter if the body of meter or the test lead
look broken.
1.2 Check the main function dial and make sure it is at the correct
position before each measurement.
1.3 Do not perform resistance, capacitance, temperature, diode
and continuity test on a live power system.
1.4 Do not apply voltage between the test terminals and test
terminal to ground that exceed the maximum limit record in this
manual.
1.5 Exercise extreme caution when measuring live system with
voltage greater than 60V DC or 30V AC.
1.6 Keep the fingers after the protection ring when measuring
through the clamp.
1.7 Change the battery when the “ ” symbol appears to avoid
incorrect data.
1.8 Use the DMM indoor, altitude up to 2000m and temperature
5°C to 40°C.
Maximum relative humidity 80% for temperatures up to
31°C, decreasing linearly to 50% relative humidity at 40°C.
1.9 In locations subject to radio frequency interference, the product
may malfunction and it resets automatically when leaving this
environment.
Meter Description
■Terminals

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Refer to table 1 for terminal function
Terminal
Function
COM
Common terminal for all measurement
V/Ω/Hz
Volts, Ohm, Diode, Freq., Temp. and Cap.
Measurement and square wave output terminal
Table 1. Terminals
Figure1.terminal
Rotary switch
Position of
Rotary switch
Function
400A
DC&AC Ampere current
2000A
DC&AC Ampere current
V
DC&AC voltage
mV
DC&AC millivolts
Hz
Duty cycle / Frequency
Ω
Resistance, Diode & continuity
Capacitance
℃/℉
Temperature

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OFF
Power off
Table 2. Rotary switch functions
Figure2. Rotary switch
Push button
Figure3. Push button
1.REL △
● Pressing this button, the meter enters relative measuring mode,
“REL▲” is displayed on the LCD and the present reading
becomes the reference value and displayed on the secondary

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display. Relative measurement has two modes.
REL▲=measurement value-Reference value, the other is
REL%=(REL▲/Reference value)×100% (press SELECT to
select REL△or REL% mode)..
● Set up reference value for your measurement.
●select your measurement function and your range.
● Press SET once, then press SELECT twice to select the
reference value for a measurement.
● Pressing the REL △ button for more than 2 seconds returns
the meter to normal state.
Pressing the button turns the backlight on, look the Selector Knob
more clearly, pressing it again turns it off.
2.SELECT
● Press this button to select your measurement mode.
3. Hz/Duty
Pressing the button display the Duty Cycle, pressing it again
display frequency.
4. MAX/MIN
● Pressing this button the meter enters the dynamic record mode.
● In the dynamic record mode, pressing this button again cycles
MAX , MIN ,AVG , MAX-MIN and Present Reading on.
5. HOLD
● Pressing this button, the meter enters the auto data hold mode
and “HOLD” is displayed on the LCD.
● The data hold function allows the operator to hold a displayed
value on the LCD while the analog bar graph continues to display
the updated value.

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● In the auto hold mode the meter can display a new value when a
new and stable value is on the input and the Beeper will sound.
● Pressing this button for more than 1 seconds, the meter exits the
HOLD mode and returns to the normal state.
●Pressing the button for more than 2 seconds turns the backlight
on, look the Selector Knob more clearly, pressing it again turns it
off.
2. SPECIFICATIONS
2.1 GENERAL SPECIFICATIONS
Display: 6000 Counts LCD with a max. reading of 6000.
Range control: Auto range & Manual range control
Polarity: Automatic negative polarity indication.
Zero adjustment: Automatic.
Over range indication: The “OL” or “-OL”display.
Low battery indication: Display " " sign.
Data hold: Display “HOLD”sign.
Relative measurement: Display “△” sign.
Bar graph display Bar graph display
Clamp opening size: 55mm.
Auto Power Off: When measurement exceeds 15 minutes
without switching mode and pressing key, the meter will switch to
standby mode. Press any key to exit standby mode. When restart
the system, press and hold any key to disable auto power off.
Express function：

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1、Display: LCD Dual Display, facilitates reads the data.

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2、Clamp Light easy for test the electric current in hidden
place.