Huayi H707 User manual
H707
Loop Calibrator
Instruction
Shenzhen Huayi Instrument Technology Co., Ltd.
1.Safety information
H707 Loop Calibrator (
hereafter to be referred as “Calibrator”
) is an
accurate tool for current supplying and measuring. The calibrator can deliver
source output 0-24mA and simulate two-wire transducer output 0-24mA, and can
measure 0-20mA or 4-20mA current loop, as well as measure DC voltage up to
28V.
This calibrator is an instrument subjects to IEC61010, CAT I 30V and
Pollution grade
Ⅱ
.
1.1 Warnings and notes
To avoid electric shock, personal injury or damage to the calibrator:
• Please use this calibrator following the guidance of this instruction, or the
protection provided by this instrument may be failed.
• Never use this calibrator near explosive gas, vapor or dust.
• Check the calibrator before using, if any damage found, please be sure not to
use.
• Check and test if the insulativity of lead wire is in good condition, and if there
is any damaged or exposed metal. Replace the damaged test wire.
• Never apply voltage above 30 V to between any two terminals or between any
terminal and the earth.
• Be sure to use proper terminal and model when measuring or supplying current.
• To avoid damage to this instrument when testing, it shall set the calibrator to
proper model before connecting the test wire.
• When connecting, it shall connect the COM test wire first, and then connect the
wire to be used; when disconnecting, it shall disconnect the wire to be used
first, and then disconnect the COM test wire.
• Never use this calibrator when the housing cover is open.
• Use the calibrator after confirming that the battery cover is closed.
• Once the symbol (low battery power) appears, please replace the battery
to avoid possible reading error.
• It must remove the test wire from the calibrator before open the housing or
battery door.
1.2
Symbols and marks
Symbol Meaning
Earth ground
Caution: important information, refer to the instruction
Double insulated
Low battery power
Conform to European Union directives
Direct current
2. Description
2.1 Button function
Button Function
Power ON/OFF button.
Start option: setting up the switch off time, for details
please refer to power section.
Backlight ON/OFF button.
Each pressing of this button goes to below mode in turn:
•SOURCE mA (source output mA)
•SIMULATE mA (analog output mA)
•Loop Power (supply loop power)
•MEASURE mA (measure DC mA)
•MEASURE V (measure DC voltage)
By pressing the turncap, the current output could be
adjusted to resolution of 1µA
、
10µA
、
100µA (default value
is 1µA); by rotating the turncap , the current output
could be increased or reduced by 1µA/10µA/100µA.
If turn the turncap in auto slope function or 25% stepping,
the current change direction could be changed.
Press to increase the current with a stepping of 25% of
the full range (0-20mA/4-20mA).
When in full range, press to reduce the current with
stepping of 25% of the full range (0-20mA/4-20mA)
Press to enter into auto slope current output function
and select a slope.
mA slope current output signals that are being continuously
applied or controlled by the calibrator and produced by one
of three below slopes.
(slow), (fast), (stepping) indicate the selected
slope.
Press to start SpanCheck from 0% of selected current
span (e.g., 0mA within 0-20mA span, or 4mA within
4-20mA span), “SpanCheck” will appear.
Press it again, then start from 100%.
+
Press and simultaneously to switch among mA
output spans.
• 4 mA-20 mA =0%-100% (default value)
• 0 mA-20 mA =0%-100% (optional)
The selection will be saved until next change.
2.2 Display
1: show the measured value or output value
2: show the percentage of measured value or
output value account for of the full scale
Symbol Explanation
MEASURE Measure current or voltage
SIMULATE Simulate output current
SOURCE Source output current
SpanCheck Full scale check (0%-100%)
Loop Power Loop power
mA V Unit symbol: mA or V
Auto oblique wave function
Low batter power
3. Use
3.1 mA current output model
The calibrator can output current which may used to calibrate and test 0-20 mA
and 4-20 mA current loop and instrument.
In SOURCE model, The calibrator can supply current.
In SIMULATE model, the calibrator can simulate two-wire transducer which
uses a set of external source.
Change the mA output span
The calibrator has two mA output spans:
• 4 mA-20 mA (0%-100% ) [default value]
• 0 mA-20 mA (0%-100%) [optional]
To change the output span, please press and simultaneously.
The
setting value for selection will be saved before next change.
Supply mA current
Use SOURCE mode to supply current to passive circuit.
There must be path which allows the current to flow between “+”
terminal and COM terminal, or it will show overload (figure flashing)
when you setting up the output value.
Press until
the display
show SORCE
(source output
mA)
Press to select
Slow slope
Fast slope and
Stepping slope
Press or
rotate the
turncap to
change in
the
resolution of
1
μ
A/10
μ
A/100
μ
A
Press to
change in
the stepping
of 25% of
the full scale
Analog transducer
When the calibrator is used as an analog transducer, it can adjust the output loop
current to the known value you selected.
There must be 12-28 V loop source. Please connect the test wires as the figure
below.
Press until
the display
shows
SIMULATE
(analog output
mA)
Press
to
select
Slow slope
Fast slope and
Stepping
slope
Press or rotate
the turncap to
change in the
resolution of 1
μ
A/10
μ
A/100
μ
A
Press to
change in the
stepping of
25% of the full
scale
Power
Max 30V
DC Current
3.2 Auto linear increasing mA output
Auto lope current output allow the calibrator to output passive (supply current)
or active (simulate) loop current that is continuously changing. And you can still
leave your hands free to test calibrator responsibility.
Press to enter into “Auto lope current output” model and step to next slope
type.
The calibrator applies or controls a continuously repeated mA signal in one of
below three slope types within the span of 0-20 mA or 4-20 mA:
Slow slope: gentle slope with rate of change 0%-100%-0% within 40s.
Fast slope: abrupt slope with rate of change 0%-100%-0% within 15s.
Stepping slop: 25% stepping slope with 5s of pause per step.
Press any key or switch off the calibrator to exit this function.
Use “Spancheck” function
“Spancheck” function can be used to check the zero point or span of a calibrator
under SOURCE or SIMULATE model.
To select “Spancheck”, please press .
Press any key or rotate the turncap to exit this function.
3.3 Measure DC current (mA)
Caution
To avoid damage to the device during test, please ensure the calibrator in
proper model before connecting the test wire.
To test mA DC:
1. Prees to step to MEASURE model.
The display shows MEASURE mA.
2. Contact the load circuit or source with the probe of the test wire.
3. If the current over 24mA, it will show “-OL-”.
Press
until the
display
shows
MEASURE
(measure
mA)
24mA DC current in maximum
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