RS PRO 123-8769 User manual

Instruction Manual
123-8769
VOLTAGE/CU ENT CALIB ATO

TABLE OF CONTENTS
1. FEATURES............................................................... 1
2. SPECIFICATIONS.................................................... 1
2-1 General Specifications........................................
.
1
2-2 Electrical Specifications.......................................2
3. FRONT PANEL DESCRIPTION....................................4
3-1 Display.....................................................................4
3-2 Function Switch........................................................ 4
3-3 Power Switch............................................................4
3-4 Ran
g
e Switch...........................................................
.
4
3-5 Calibration Ad
j
ust knob.............................................
.
4
3-6 Battery Compartment/Cover...................................... 4
3-7 Input Socket...................................................... 4
3-8 Cable Plug.........................................................
.
4
3-9 Alligator Clips.....................................................4
4. MEASURING PROCEDURE.........................................5
4-1 Current source .................................................. 5
4-2 Current measurement.........................................5
4-3 Power and current measurement of two wire
loop................................................................. 6
4-4 DC mV source.................................................... 7
5. REPLACEMENT OF BATTERY.....................................8

1. FEATURES
* Portable instrument for calibrating process devices and
measuring process signals.
* Adjustable 0-24 mA current source.
* Adjustable -199.9 mV to +199.9 mV DCV source.
* Current calibrator drives loads up to 500 ohms.
* The instruments can power as well as measure a two-wire
current loop, useful for testin
g
4-20mA loop devices ( for
example pressure transmitters).
* Four functions include: 1) Precision current source
2) Measurement of current signal 3) Simultaneous powering
and measurement of a 2-wire current loop 4)Precision DC
mV source,
2. SPECIFICATIONS
2-1 General Specifications
Display LCD display, max. display count 1999.
13 mm ( 0.5" ) di
g
it hei
g
ht.
Function 1) Current source :
Ran
g
e & 2 ran
g
es :
Resolution 0 - 19.99 mA x 0.01 m
A
0 - 24 mA x 0.1 m
A
2) Current measurement :
2 ran
g
es :
0 - 19.99 mA x 0.01 m
A
0 - 24 mA x 0.1 m
A
3) Power and current measurement of
two wire loop :
0 - 19.99 mA x 0.01 m
A
0 - 24 mA x 0.1 m
A
4) DC mV source :
- 199.9 mV to + 199.9 mV x 0.1 mV
1

Samplin
g
Approx. 0.4 second.
Time
Over input Indication of " 1 ".
Indication
Operatin
g
0 to 50 ( 32 to 122 ).℃℃℉ ℉
Temperature
Operatin
g
Less than 80% RH.
Humidity
Power Supply 006P DC 9V, MN1604/PP3 battery or
equivalent.
Alkaline type or heavy duty type.
Power Current measurement :
Consumption Approx. DC 12 m
A
Power and current measurement :
Approx. DC 12 m
A
Current source (under 10 mA si
g
nal out put) :
Approx. DC 33 m
A
DC mV source (under 100 mV si
g
nal out put) :
Approx. DC 33 m
A
Dimension 185 x 78 x 38 mm ( 7.3 x 3.0 x 1.5 inch ).
Wei
g
ht 265
g
/0.58 LB ( incluin
g
battery ).
Accessories Operational manual............................. 1 PC.
Included Cable with the alli
g
ator pairs
( red & black ), LN-TL421.................... 1 PC.
2-2 Electrical Specifications (23 5 )℃
Current source
Ran
g
e Display Accuracy
Resolution
0 - 19.99 m
A
0.01 m
A
± ( 0.25 % FS + 1 d )
0 - 24 m
A
0.1 m
A
± ( 0.5 % FS + 1 d )
* Output 0 to 24 mA current for loads up to 500 ohms.
Output > 20 mA current for loads up to 400 ohms.
* FS : full scal
e
2

Current measurement
Ran
g
e Display Accuracy
Resolution
0 - 19.99 m
A
0.01 m
A
± ( 0.25 % FS + 1 d )
0 - 24 m
A
0.1 m
A
± ( 0.5 % FS + 1 d )
* FS : full scal
e
Power and current measurement of two wire loop
Ran
g
e Display Accuracy
Resolution
0 - 19.99 m
A
0.01 m
A
± ( 0.25 % FS + 1 d )
0 - 24 m
A
0.1 m
A
± ( 0.5 % FS + 1 d )
* Provides power DC 12V 2 V to the loop and measure
s
current.
* FS : full scal
e
DC mV source
Ran
g
e Display Accuracy
Resolution
- 199.9 mV 0.1 mV ± ( 0.25 % FS + 1 d )
to
+ 199.9 mV
* Output measured load impedance should > 1 K ohms.
* FS : full scal
e
Remark :
T
he above specification are tested under the environment
RF Field Stren
g
th less than 3 V/M & frequency less than th
e
30 MHz only.
3

3. FRONT PANEL DESCRIPTION
Fi
g
. 1
3-1 Display
3-2 Function Switch
3-3 Power Switch
Symbol
1 = On 0 = Off
3-4 Range Switch
3-5 Calibration Adjust knob
3-6 Battery Compartment/Cover
3-7 Input Socket
3-8 Cable Plug
3-9 Alligator Clips
4

4. MEASURING PROCEDURE
4-1 Current source
1)Install the " Cable Plug " ( 3-8, Fig. 1 ) into the " Input
Socket " ( 3-7, Fig. 1 ).
2)Slide the " Function Switch " ( 3-2, Fig. 1 ) to the
" CURRENT SOURCE " position.
3)Slide the " Range Switch " ( 3-4, Fig. 1 ) to " 0 -
19.99 mA " position for getting the 0.01 mA display
resolution ( max. display is 19.99 mA ). Slide the " Range
Switch " ( 3-4, Fig. 1 ) to " 0 - 24.0 mA " position for
getting the 0.1 mA display resolution.
4)Adjust the " Calibration Adjust knob " ( 3-5, Fig. 1 ) will
generate the current output same as the display value.
Note :
The " Red Alligator clip " ( 3-9, Fig. 1 ) is for the
positive current output. The " Black Alligator clip "
( 3-9, Fig. 1 ) is the " ground " for current output.
4-2 Current measurement
1)Install the " Cable Plug " ( 3-8, Fig. 1 ) into the " Input
Socket " ( 3-7, Fig. 1 ).
2)Slide the " Function Switch " ( 3-2, Fig. 1 ) to the
" mA MEASURE " position.
3)Slide the the " Range Switch " ( 3-4, Fig. 1 ) to " 0 -
19.99 mA " position for geeting the 0.01 mA display
resolution ( max. display is 19.99 mA ). Slide the " Range
Switch " ( 3-4, Fig. 1 ) to " 0 - 24.0 mA " position for
getting the 0.1 mA display resolution.
4)Open the circuit in which current is to be measured and
connect the " Alligator Clips " ( 3-9, Fig. 1 ) securely in
series with the load in which the current is be measured.
5

Note :
The " Red Alligator clip " ( 3-9, Fig. 1 ) is for the
positive current measurement input. The " Black
Alligator clip " ( 3-9, Fig. 1 ) is for the negative
current measurement input.
4-3 Self-powered two-wire current loop measurement
meter equivalant block diagram red
clip
DC 12 V + 19.99 +
2 V
POWER SOURCE Current meter black
clip
-
external
Fig. 2 measuring
load
1)Install the " Cable Plug " ( 3-8, Fig. 1 ) into the " Input
Socket " ( 3-7, Fig. 1 ).
2)Slide the " Function Switch " ( 3-2, Fig. 1 ) to the
" POWER/ mA MEASURE " position.
3)Slide the " Range Switch " ( 3-4, Fig. 1 ) to " 0 -
19.99 mA " position for getting the 0.01 mA display
resolution ( max. display is 19.99 mA ). Slide the " Range
Switch " ( 3-4, Fig. 1 ) to " 0 - 24.0 mA " position for
getting the 0.1 mA display resolution.
4)Open the circuit in which current is to be measured and
connect the " Alligator Clips " ( 3-9, Fig. 1 ) securely in
series with the load in which the current is be measured.
6

Note :
a.The " Red Alligator clip " ( 3-9, Fig. 1 ) is for
the positive current measurement input.
The " Black Alligator clip " is for the negative
current measurement input.
b.The measuring procedures & principal are the same
as those in 4-2 Current measurement except the
fact that the 12V DC power source is derived from th
e
calibrator rather than from an external voltage sourc
e
4-4 DC mV source
1)Install the " Cable Plug " ( 3-8, Fig. 1 ) into the " Input
Socket " ( 3-7, Fig. 1 ).
2)Slide the " Function Switch " ( 3-2, Fig. 1 ) to the
" VOLTAGE SOURCE " position.
3)Adjust the " Calibration Adjust knob " ( 3-5, Fig. 1 ) will
generate the voltage ( mV ) output same as the display value.
Note :
The " Red Alligator clip " ( 3-9, Fig. 1 ) is for the
positive voltage output. The " Black Alligator clip "
( 3-9, Fig. 1 ) is for the negative voltage output.
7

5. REPLACEMENT OF BATTERY
1)When LCD display show the " BAT " marker,
It is necessary to replace the battery. However,
in-spec measurement may still be made for several
hours after low battery indicator appears before the
instrument become inaccurate.
2)Slide the " Battery Cover " ( 3-6, Fig. 1 ) away from the
instrument by loss the screw and remove the battery.
3)Replace with 9V battery ( Alkaline or heavy duty type )
and reinstate the cover.
4)Make sure the battery cover is secured after change the
battery.
RS Components UK
T
el: 01536 201234
PO Box 99 Corby
Northamptonshire NN17 9RS
United Kin
g
dom Fax: [phone]
80009-CC-421-RS

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