voltage/current calibrator
VOLTAGE/CURRENT
CALIBRATOR
ISO-TECH ILC-421
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 Range Switch............................................................ 4
3-5 Calibration Adjust 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 testing 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
Function
Range &
Resolution
LCD display, max. display count 1999.
13 mm ( 0.5" ) digit height.
1) Current source :
2 ranges :
0 - 19.99 mA x 0.01 mA
0 - 24 mA x 0.1 mA
2) Current measurement :
2 ranges :
0 - 19.99 mA x 0.01 mA
0 - 24 mA x 0.1 mA
3) Power and current measurement of
two wire loop :
0 - 19.99 mA x 0.01 mA
0 - 24 mA x 0.1 mA
4) DC mV source :
- 199.9 mV to + 199.9 mV x 0.1 mV
1
Sampling
Time
Over input
Indication
Operating
Temperature
Operating
Humidity
Power Supply
Power
Consumption
Approx. 0.4 second.
Indication of " 1 ".
0 ℃ to 50 ℃ ( 32 ℉ to 122 ℉ ).
Less than 80% RH.
006P DC 9V, MN1604/PP3 battery or
equivalent.
Alkaline type or heavy duty type.
Current measurement :
Approx. DC 12 mA
Power and current measurement :
Approx. DC 12 mA
Current source (under 10 mA signal out put) :
Approx. DC 33 mA
DC mV source (under 100 mV signal out put) :
Dimension
Weight
Accessories
Included
Approx. DC 33 mA
185 x 78 x 38 mm ( 7.3 x 3.0 x 1.5 inch ).
265 g/0.58 LB ( incluing battery ).
Operational manual............................. 1 PC.
Cable with the alligator pairs
( red & black ), LN-TL421.................... 1 PC.
2-2 Electrical Specifications (23 5 ℃)
Current source
Range
Display
Resolution
0 - 19.99 mA
0.01 mA
0 - 24 mA
0.1 mA
Accuracy
± ( 0.25 % FS + 1 d )
± ( 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 scale
2
Current measurement
Range
Display
Resolution
0 - 19.99 mA
0.01 mA
0 - 24 mA
0.1 mA
Accuracy
± ( 0.25 % FS + 1 d )
± ( 0.5 % FS + 1 d )
* FS : full scale
Power and current measurement of two wire loop
Range
Display
Accuracy
Resolution
0 - 19.99 mA
0.01 mA
± ( 0.25 % FS + 1 d )
0 - 24 mA
0.1 mA
± ( 0.5 % FS + 1 d )
* Provides power DC 12V 2 V to the loop and measures
current.
* FS : full scale
DC mV source
Range
- 199.9 mV
to
Display
Resolution
0.1 mV
Accuracy
± ( 0.25 % FS + 1 d )
+ 199.9 mV
* Output measured load impedance should > 1 K ohms.
* FS : full scale
Remark :
The above specification are tested under the environment
RF Field Strength less than 3 V/M & frequency less than the
30 MHz only.
3
3. FRONT PANEL DESCRIPTION
Fig. 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
DC 12 V
2V
POWER SOURCE
+
19.99
Current meter
red
clip
+
black
clip
external
measuring
load
Fig. 2
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 the
calibrator rather than from an external voltage source
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
PO Box 99 Corby
Northamptonshire NN17 9RS
United Kingdom
8
Tel: 01536 201234
Fax: 01536 405678
0009-CC-421-RS
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