REED R5820 User manual

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LOOP Calibrator
User Manual

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WARRANTY
Our company warrants to the original purchaser that each product it manufactures will be free from defects in
material and workmanship under normal use and service for a period of one year from date of purchase. Our company’s
warranty does not apply to fuses, test leads or any product which, in our company’ s opinion, has been misused, altered,
or damaged by accident or abnormal conditions of operation or handling.
To obtain warranty service, contact your nearest Service Center (or send the product, with a description of the
difficulty, and postage prepaid, to the nearest Service Center). Our company assumes no risk for the damage in transit.
Our company will, at its option, repair or replace the defective product free of charge or refund your purchase price.
However, if our company determines that the failure was caused by misuse, alterations, accident or abnormal condition
of operation or handing, you will be billed for the repair and the repaired product will be returned to you transportation
prepaid.
SHIPPING TO MANUFACTURER
FOR REPAIR OR ADJUSTMENT
All shipment of our company’s instruments should be made via United Parcel Service or “Best Way” prepaid. The
instrument should be shipped in the original carton; or if it is not available, use any suitable container that is rigid and of
adequate size. If a substitute container is used, the instrument should be wrapped in paper and surrounded with at least

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four inches of excelsior or similar shock-absorbing material.
CLAIM FOR DAMAGE IN SHIPMENT
TO ORIGINAL PURCHASER
The instrument should be thoroughly inspected immediately upon original delivery to purchaser. All material in the
container should be checked against the enclosed packing list. The manufacturer will not be responsible for shortages
against the packing sheet unless notified immediately.
If the instrument is damaged in any way, a claim should be filed with the carrier immediately. (To obtain a quotation
to repair shipment damage, contact the nearest Service Center.) Final claim and negotiations with the carrier must be
completed by the customer.

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INDEX
P a g e
1. Safety Information………………………………………………………………………………………………………… 1
2. Instrument Panel Layout and Functions……………………………………………………………………………… 2
3. Instrument Maintenance………………………………………………………………………………………………… 3
4. Power-on/off of Instrument……………………………………………………………………………………………… 4
5. Output from Instrument……………………………………………………………………………………………………5
6. Instrument Measurement…………………………………………………………………………………………………7
7. Setting Function………………………………………………………………………………………………………… 10
8. Performance Index……………………………………………………………………………………………………… 11
9. Calibration…………………………………………………………………………………………………………………12
10. Notice of the Manual………………………………………………………………………………………………………15

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Section One Safety Information
To ensure the safety operation, the following signs are used only as
specified in this operation instruction：
Warning A warning shows that if the operation does
not comply with the following correct
instruction it is possible to bring hazards to
the user or cause damage to the
instrument in use. The warning also points
out how to avoid the accidents.
Caution A caution shows that if the operation does
not comply with the following correct
instruction, it is possible to cause damage
to the instrument in use .The caution also
points out how to avoid mal-operation.
Note A note serves as a sign to remind the user
that is must understand the correct
operation of the instrument and its
characteristics.
To prevent the user and the Instrument from any electric shock and
other hazards, it is necessary to observe the following regulation:
Warning
• It is not allowed to operate the Instrument at the working field where
there exists flammable gas or explosive gas or vapor. It is very
dangerous to operate the instrument in such a surrounding.
• Never apply more than 30V between any two terminals, or
between any terminal and earth ground.
Caution
• No one is allowed to remove the split case of the Instrument except
professionals.
• Periodically wipe the case with a damp cloth and detergent; do not
use any corrosive solvents.
Note
• To keep the Instrument in a designed accuracy, it needs warming
up 5 minutes before it is put into operation.
• If any user requires a higher accuracy of the calibrator, he or she is
requested to make contact with the manufacturer or our product
distributors.

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Section Two Instrument Panel Layout and
Functions
lustration of LCD Display Area
LCD
Display
Are
a
Power
s
wit
c
hkey
Single
step/auto-sw
itch key
25% single
step setting/
auto-ram
p
mA%/unit
select key
Output/in
put switch
0% &
100% of
setting/aut
o-ramp
start key
τυInput
digit
π
θ
Output
value
Input/outp
ut
terminal

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OUTPUT ：
Press the key〔OUTPUT / IN / SW〕when
the symbol OUTPUT appears. It denotes that the
Instrument is in a state of output.
INPUT ：
Press the key 〔OUTPUT / IN / SW〕when
the symbol INPUT appears. It denotes that the
Instrument is in a state of input.
CAL ： When the symbol CAL appears, it denotes
that the Instrument is in a state of calibration.
0 FS ：
When the symbol ‘O’ or ‘FS’ appears during
the calibration, it denotes that the zero point or the full
scale point is being calibrated.
： When this symbol appears, it denotes that
the battery is nearly used up and needs replacing.
π ： When this symbol appears, it denotes that
the output digits need setting.
V、mA 、% ：
These symbols denote the units of both
present input and output values.
ON、OFF ：
These symbols denote the turn-on or turn-off
of any input / output signals.
：These symbols denote the high and low-speed
auto-ramp, auto-step ramp.
Section Three Instrument Maintenance
This section provides some basic maintenance
procedures. Repair, calibration, and servicing not
covered in this manual must be performed by qualified
personnel. For maintenance procedures not described in
this manual, contact a Service Center.
General Maintenance
Periodically wipe the case with a damp cloth and
detergent; do not use abrasives or solvents.
zTake out the batteries if the Instrument will not be
used for a long time.
zDirt or moisture in the terminals can affect readings.
Clean the terminals as follows:
1) Turn the Instrument off and remove all test
leads.
2) Shake out any dirt that may be in terminals.
3) Soak a new swab with alcohol. Clean each
terminal with the swab.
Replacing the Batteries

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This Instrument is powered by two AA batteries (IEC
LR6).
Warning
To avoid electrical shock or personal injury:
zRemove Test Leads from the Instrument before
opening the battery door.
zClose and latch the Battery Cover before using the
meter.
Note
zThe new and old Batteries cannot be mixed.
zMake sure the battery’s odes are in accordance with
the marks illustrated in battery pool when replacing
them.
zTake out the batteries if the meter will not be used
for a long time.
zDispose the old batteries in accordance with the
local law.
Replace the batteries as follows.( See Figure 3-1):
1) Turn off the Instrument and remove all Test
Leads from the Terminals;
2) Take off the protector of the Instrument; remove
the battery cover by using a standard-blade
screwdriver to turn the battery door fasteners,
and then take of the battery case;
3) Replace with two new batteries;
4) Reinstall the battery case and tighten screws.
Figure 3-1 Replacing batteries
Replacing Fuse
Warning
To avoid personnel injury or damage to the meter,
use only the specified fuse. The specification is 63mA
250V fast-melt.
Replace the fuse as follows (Refer to Figure 3-2 if
necessary):
1) Remove the test leads from the meter and turn
the meter OFF;
2) Take off the protector of the meter, remove the
four screws by using a standard-blade screwdriver, and
then take off the cover;
3) Replace the blown fuse(s);

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4) Reinstall the cover;
5) Reinstall the meter’s protector.
Figure 3-2 Replacing fuses
Section Four Power-on/off of Instrument
Power on/off
Press the power key to turn on the power supply of
the Instrument. Then repress it to hold it in one second
and the power will be off.
When the power is turned on, the Instrument starts to
make self-diagnosis internally and the full screen is in
display. After this, appropriate operation should be
carried out.
Note
To ensure correct operation of the Instrument, it is
recommended to turn off the power pausing 5 seconds
and then restart the Instrument.
Automatic Power-off
The factory default setting is that the Instrument will
cut off the power automatically if no operation applied to
the Instrument within 15 minutes.
Users can decide whether they want to use this
function or not.(See Section 7 for reference)
Section Five Output from Instrument
The Instrument produces the DC current from its
appropriate output terminal（OUTPUT）set by the user or
simulating a transmitter.
Caution
Do not apply voltage to the output terminal during the
operation. If any improper voltage is applied to the output
terminal, it will cause damage to the internal circuit.
Output Operation Procedure

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Function
Operation
%
Operation Display Setting Range
DCI
20mA
20 mA
2
%
00.000 mA
-025.00
mA %
00.000～22.000
mA
-025.00～112.50
mA %
Current Output
1) Insert one end of the test leads to the + mA –
output jack （OUTPUT ）of the Instrument and
connect the other end with the input of the user’s
Instrument as shown in Figure 5-1:
MAX
30V
30V
MAXMAX
30V
INPUT
OUTPUT
COM
mA
V
+LOOP
XMT+mA-
+
Figure 5-1
2) Press the key〔OUTPUT/IN〕, and the OUTPUT
appears in the display. It denotes that the
Instrument is in an output state;
3) Press the key〔mA%/V〕, to select the output to be
set in ‘mA’or %, and then the unit mA or mA%
appears, in which 0% denotes 4mA; 100% denotes
20mA;
4) Press the key〔τ〕/〔υ〕to select the set digits of the
output;
5) Press the key〔π〕/〔θ〕to change the value of the set
digits. The value can do carry or number decrement
automatically. Hold the pressed key in one second
and the numerical value will keep varying.
25% Step Current Output
1) Connect to the Instrument as shown in Figure 5-1;
2) When the key 〔OUTPUT/IN 〕is pressed, the
OUTPUT appears in the LCD, it denotes the
Instrument is in an output state;
3) Press the key〔25%/RAMP〕and the symbols‘’ and
‘π’will appear;
4) Press the key 〔mA%/ V〕to select the output to
be set in mA or %, and then the unit ‘mA’or‘mA %
appears;
5) Press the key 〔π〕/〔θ〕to change the output in a
value of 25%, in which 0% denotes 4mA and 100%
denotes 20mA;

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6) Repress the key〔25%/RAMP〕so as to exit the step
current output.
Current Output Set for Zero Point & Full Scale
1) Connect to the Instrument as shown in Figure 5-1;
2) When the 〔OUTPUT/IN 〕key is pressed, the
OUTPUT appears in the LCD, it denotes the
Instrument is in an output state;
3) Press the key〔100%/START〕and the symbols ‘ ’、
‘π’、‘0’、‘FS’ will appear in the display;
4) Press the key〔π〕to be set to 100% and the current
output will be 20mA. Press the key〔θ〕to be set to
0% and the current output will be 4mA;
5) Repress the key〔100%/START〕so as to exit the
step current output.
Auto-ramp Output
1) Connect as shown in Figure 5-1;
2) When the key 〔OUTPUT/IN 〕is pressed, the
OUTPUT appears in the LCD, it denotes the
Instrument is in an output state;
3) When the key 〔STEP/AUTO 〕is pressed, the
symbols ‘OUTPUT’, ‘OFF’, ‘ ’along with ‘4mA’
appear in the LCD. If so, it denotes that the
Instrument is getting into the mode of RAMP;
4) Repress the key 〔25%/RAMP 〕again so as to
change the type of the output ramp, which finds
itself in the lower left of the LCD. The type appears
with‘’、‘ ’、‘ ’，in proper order. These
symbols denote a low speed ramp and a high speed
ramp respectively. The former is set to a cycle up to
60S and the latter is up to 30S, while the auto-stair
step ramp pauses 5 seconds at each step;
5) Press the key〔100%/START〕to start the output of
the set waveform when the symbol ‘ON’ appears.
Now repress the key〔100%/START〕again and the
output will pause on a current value and the symbol
‘OFF’ will appear. Then press the same key again
and the output will continue to do the set steps from
the pause value. When the symbol ‘OFF’ appears,
press any one of the keys〔τ〕,〔υ〕,〔π〕,〔θ〕so
as to bring the output back to the 0%. Then the
value of 4mA appears in the display.
Simulating Transmitter Output (XMT)
1) Insert one end of the test lead to the ‘XMT’ output
jack of the Instrument and connect the other end
with the input terminal of the user’s device as shown
in the Figure 5-2:

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MAX
30V
30V
MAXMAX
30V
INPUT
OUTPUT
COM
mA
V
+LOOP
XMT+mA-
+
5--25VDC Power
Power
Figure 5-2
2) The key-operation is the same as that of the current
output.
Note
• Range of power supply: 5 to 25VDC.
• Usage: during the operation of the current output, use
the external 24VDC power supply in a mode of
connecting a transmitter, thus being able to prolong the
working life of the battery.
Section Six Instrument Measurement
Warning
During the operation, never apply more than 30V
between any two terminals, or between any terminal and
earth ground. Any voltage more than 30V will not only do
damage to the Instrument, but also lead to possible
personal injury.
Caution
• During the operation, do not apply a voltage or current
exceeding the measuring range to the input terminal,
which will cause possible damage to the Instrument.
• When connecting to the Instrument, the power supply of
the device under test should be cut off. Otherwise, any
connection with a device without cutting off its power
supply will cause possible damage to the Instrument.
Input Operation Procedure
Function
Operatio
n
%Oper
ation Display Measurement Range
DCI
20 mA
22
DCV
28 V
20 mA
2
%
00.000 mA
-25.00 mA %
0.000 V
-1.000～22.000 mA
-31.25～112.50
mA %
-0.2000～28.000 V

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Measuring DC Current
1) Insert one end of the test lead into the mA jack of
the Instrument （INPUT）terminal and connect the
other end to the output of the user’s device as
shown in Figure 5-3:
MAX
30V
30V
MAXMAX
30V
INPUT
OUTPUT
COM
mA
V
+LOOP
XMT+mA-
+
Figure 5-3
2) Press the key〔OUTPUT / IN〕, the LCD displays
‘INPUT’, and it denotes that the Instrument is in an
input state.
3) Press the key〔mA%/V〕to select the input to be set
in ‘mA’ or ‘mA %’, and the LCD displays unit ‘mA’ or
‘mA %’, in which the value of 0 % denotes 4mA and
the value of 100% denotes 20mA.
4) The Instrument starts measurement, and the LCD
displays ‘ON’, and the measured result
simultaneously.
5) The refreshing rate of measurement result is twice
every second. And the LCD displays ‘OL’ if the
measured value exceeds the measuring range.
Measuring DC Voltage
1) Insert one end of the test lead into the V jack of the
Instrument （INPUT）terminal and connect the other
end to the output of the user’s device as shown in
Figure 5-4:
2) Press the key〔OUTPUT / IN〕, the LCD displays
‘INPUT’, and it denotes that the Instrument is in an
input state.
3) Press the key〔mA%/V〕to select V function, and
the LCD displays unit ‘V’.
4) The Instrument starts measurement, and the LCD
displays ‘ON’, and the measured result
simultaneously.
5) The refreshing rate of measurement result is twice
every second. And the LCD displays ‘OL’ if the
measured value exceeds the measuring range.

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MAX
30V
30V
MAXMAX
30V
INPUT
OUTPUT
COM
mA
V
+LOOP
XMT+mA-
M
+
Figure 5-4
Providing 24V Power Supply for Measuring Loop
Current
Insert the test lead into the +LOOP and mA input
jacks of the input terminal （INPUT）of the Instrument as
shown in Figure 5-5:
The key operation is the same as that of measuring
the DC current.
MAX
30V
30V
MAXMAX
30V
INPUT
OUTPUT
COM
mA
V
+LOOP
XMT+mA-
+Transmitter
Section Seven Setting Function
Fulfilling of the following operation will change the
auto-power-off function of the Instrument:
In power-off state, press the keys〔mA%/V〕and
〔power〕simultaneously to power on, and release the
〔mA%/V 〕key only after the LCD displays all the
contents. The Instrument enters into the calibration mode,
and the symbols ‘AP -XX ’appear in the LCD;
Press the key〔π〕/〔θ〕, and when the LCD displays
‘AP- OF ’, the Instrument removes auto-power-off
function; And when the LCD displays ‘AP- ON ’, the
Instrument recovers the auto-power-off function.
Press the key 〔100%/START〕to store the selection;
Cut off the power again to exit from the maintenance
function.

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Section Eight Performance Index
Output Performance Index (applicable to temperature range from 18℃to 28℃, within one year after calibration)
Output Range Output Range Resolution Accuracy Remark
DCA 20mA 0.000～22.000mA 0.001mA ±0.05% set value
±4uA Max. load 1KΩat 20mA.
Simu-transmitter(absorption
current) -20mA 0.000～-22.000mA 0.001mA ±0.05% set value ±4uA
Max. load 1KΩat 20mA.
Note: power supply range:
5～25VDC
Loop Power Supply 24V
±10% Max. output current up to 25mA.
Input Performance Index(applicable to temperature range from 18℃to 28℃, within one year after calibration)

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Input Range Output Range Resolution Accuracy Remark
Voltage 28V
-0.200～28.000V 1mV ±0.02% reading±2mV Input resistance about 1MΩ
Current 20mA
-1.000～22.000mA 0.001mA ±0.02% reading±4uA resistance about 20Ω
Loop Current 20mA 0.000～22.000mA 0.001mA ±0.02% reading±4uA providing 24V loop power
General Specifications
Power supply : 2 1.5V alkaline batteries(LR6)
Battery life : about 400mA /3V under the condition of 10mA with 1kΩload
Max. permitted voltage : 30V(between any two terminals or between any terminal and earth ground)
Operating temperature : 0℃to 50℃
Operating relative humidity : ≤80% RH
Storage temperature : ≤-10℃to 50℃
Relative humidity for storage : ≤90% RH
Temperature co-efficiency : 0.1×（designated accuracy）%/℃（5℃～18℃、28℃～40℃）
Size : 180（L）×90（W）×47（D）mm (with holster)
Weight : 500g(withholster)
Accessories : operationinstruction, a set of CF-36 industrial test lead(with alligator clips
attached to probes)
Safety : certifiedascomplianttoIEC1010provisions(Safetystandardissuedby
International Electrotechnical Commission)
Section Nine Calibration
Note

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zCalibration: In order to keep the designed accuracy of this Instrument, it is recommendable to calibrate your
calibrator once a year. The following example shows the use of recommended standard equipment to perform the
calibration.
Caution
zUsage：Never apply more than the max. permitted voltage to the input of the calibrator, otherwise the overvoltage
will lead to possible damage to the input section.
zUsage: during the operation, avoid short circuit and never apply more than the max. permitted voltage to the output
of the Instrument or to a co-working standard device, otherwise any mal-operation will cause possible damage to their
internal circuits.
Selecting Standard Equipment
Table 10-1
Calibration Item Standard
Equipment Output Range Accuracy Recommended
Output DCA 20mA Digit meter MAX.22 mA ±（50ppm＋0.4uA）Digit meter:KEITHLEY 2000
Standard resistance:BZ10-100Ω
Measure
ment
DCA 20mA Standard
source MAX.33mA ±（100ppm＋0.2uA）
5520 (FLUKE) or equivalent
DCV 28V Standard
source MAX.33V ±（12ppm＋15uV）
Ambient Condition for Calibration
Ambient temperature: 23℃±1℃;
Relative humidity: 45 to 75% RH;
Preheating: standard instrument should be
preheated to specified time;
Put this Instrument in calibration environment for 24
hours, then connect to the power, and set it in non auto-
power-off state, and preheat for half an hour.
Note
Power supply for calibrator: during the calibration, it

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is recommendable to use 2 1.5V（LR6）batteries.
Operating Output Calibration
Operating calibration in order of items and calibration
points listed in Table 10-2:
Table 10-2
Item
No. Output Range Calibration Point
1 DCA/20mA
0
0 FS
FS
1) In power-off state, press the keys 〔OUTPUT /
INPUT〕and〔power〕simultaneously to power on,
and release the〔OUTPUT / INPUT〕key only after
the LCD displays all the contents. The Instrument
enters into the calibration mode, and the symbols
‘CAL 0’ appear in the LCD;
2) Press the key〔OUTPUT / INPUT〕to select output
function , and the LCD displays ‘OUTPUT ’,‘mA ’;
3) Connect to the Instrument as shown in Figure 10-1;
4) Set the digital meter to an appropriate range;
5) When the output stabilized , press the key〔τ〕/〔υ〕
and the key 〔π〕/〔θ〕to adjust the calibrator to a
value in identity with the reading of the digit meter;
6) Press the key 〔100%/START 〕, and the LCD
displays ‘SAVE ’, denoting that the calibrated point
has been stored;
LO
BZ-10
HI
KEITHLEY2000
Figure 10-1
7) Press the key 〔STEP/AUTO〕and the LCD displays
‘CAL 0 FS’. With the output stabilized, repeat
the operation of steps 5 and 6;
8) Press the key〔STEP/AUTO〕and the LCD displays
‘CAL 0 FS’. With the output stabilized, repeat
the operation of steps 5 and 6.
Operating Input Calibration
Operating calibration in order of items and calibration
points in Table 10-3：
Table 10-3
Item
No. Input Range Calibration Point

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1 DCA/20mA
0 : 00.000mA
FS : 19.000mA
2 DCV/28V
0 : 00.000V
FS : 19.000V
Current Measurement Calibration
1) In power-off state, press the keys 〔OUTPUT /
INPUT〕and〔power〕simultaneously to power on,
and release the〔OUTPUT / INPUT〕key only after
the LCD displays all the contents. The Instrument
enters into the calibration mode, and the symbols
‘CAL 0’ appear in the LCD.
2) Press the 〔OUTPUT / INPUT 〕key to select
measurement function , and the LCD displays
‘INPUT ’,‘mA ’;
3) Connect to the Instrument as shown in Figure 10-2;
TRIG
OUT
AUX SCOPE
Lo
NORMAL
Hi
Standard Source
（5520A）
Figure 10-2
4) Set the standard source to an appropriate range;
5) Set the output of standard source as the value given
in Table 10-3 and when the output stabilized , press
the 〔100%/START〕key, and the LCD displays
‘SAVE ’, denoting that the calibrated point has
been stored;
6) Press the key〔STEP/AUTO〕and the LCD displays
‘CAL FS’, and repeat the operation of steps 5.
Voltage Measurement Calibration
1) Press the key 〔mA % / V 〕to select voltage
measurement function , and the LCD displays
‘INPUT ’、‘CAL 0’、‘V ’;
2) Connect to the Instrument as shown in Figure 10-3;
3) Set the standard source to an appropriate range;
4) Set the output of standard source as the value given
in Table 10-3 and when the output stabilized , press
the key〔100%/START〕, and the LCD displays
‘SAVE ’, denoting that the calibrated point has been
stored;
TRIG
OUT
AUX SCOPE
Lo
NORMAL
Hi
Standard Source
（5520A）

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Figure 10-3
5) Press the key〔STEP/AUTO〕and the LCD displays
‘CAL FS’ , and repeat the operation of steps 4.
Section Ten Notice of the Manual
zThe present operation instruction is subject to
change without notice;
zThe content of the operation instruction is regarded
as correct. Whenever any user finds its mistakes,
omission, etc., he or she is requested to contact the
manufacturer;
zThe present manufacturer is not liable for any
accident and hazard arising from the customer
misuse or inadvertent operation;
zThe functions described in this operation instruction
should not be used as grounds to apply this product
to a particular purpose.