Elma 30C User manual

Loop Calibrator
Instruction Sheet

l Replace the battery as soon as the (low battery) symbol
appears to avoid false readings that can lead to electric shock.
l Remove test leads from the Calibrator before opening the case or
battery door.
Symbol
Symbol
Meaning
Earth ground
Caution : Important information. Refer to instruction sheet.
Double insulated
Battery
Conforms to European union requirements
Direct current
3

MEASURE / DC VOLTAGE(auto)
Range
Resolution
Accuracy
Overload Protection
2V
100㎶
±(0.05% rdg + 5dgts)
100V DC or AC peak with
10 Seconds
20V
1㎷
50V
10㎷
MEASURE / DC CURRENT(auto)
Range
Resolution
Accuracy
Overload Protection
2㎃
0.1㎂
±(0.05% rdg + 5dgts)
unfused
20㎃
1㎂
25㎃
10㎂
16
Using the mA Sourcing (Output) Modes
The Calibrator outputs current for calibrating and testing 0 to 24mA and 4 to
20mA current loops and instruments.
In SOURCE mode, the Calibrator supplies the current.
In SIMULATE mode, the Calibrator simulates a 2-wire transmitter in an
externally-powered current loop.
Changing the mA Output Span
The Calibrator has two mA output spans:
l 4mA to 20mA ( 0% to 100% ) [default]
l 0mA to 24mA ( -25% to 125% ) [optional]
Sourcing mA
Use SOURCE mode to supply current to a passive circuit.
A path must exist for current to flow between the + and COM terminals.
Otherwise the display indicates an Display Flicker when you set an output value.
5

Specification
General Specifications
l 4 1/2 digit Large display and simple. Quick-click interface for easy one-
handed operation.
l Simultaneous mA and % read out for quick, easy interpretation of
readings.
l mA accuracy of 0.025%.
l 1mA resolution for mA source, simulate and measures.
l Push button 25% steps for fast, easy linearity checks.
l 24 Volt internal loop supply, so you can power and read a transmitter at
the same time with carry a DMM.
l Innovation output adjustment dial with 1mA and 100mA resolution.
l Storage temperature : - 40 °C to 60°C
l Operating temperature : - 10 °C to 55°C
l Power requirements:
Single 9V battery (ANSI/NEDA 1604A or IEC 6LR61)
l Battery life (typical) : Approx 15 hours
l Size : 88mm (W) × 178mm (L) × 33mm (H)
[ 3.5 in (W) × 7 in (L) × 1.3 in (H) ]
l Weight: 300g with holster
14
Simulating a Transmitter
When simulating the operation of a transmitter, the Calibrator regulates the loop
current to a known value selected by you. A 12V to 30 V loop supply must be
available. Insert the test leads as shown below.
7

Maintenance
Caution
To avoid electric shock, personal injury, or damage to the Calibrator:
l Do not service this product other than as described in this
Instruction Sheet unless you are a qualified technician and have
the required equipment and service information.
l Remove any input signals prior to removing test leads and opening
case.
l When servicing the Calibrator, use only specified replacement
parts.
l Do not allow water to get in the case.
In Case of Difficulty
l Make sure you are using the Calibrator as described in this Instruction
Sheet.
l Check the battery and test leads. Replace as needed.
If the Calibrator is under warranty, refer to the warranty statement for warranty
terms, conditions, and product return information.
If the warranty has lapsed, the Calibrator will be repaired and returned for a fixed
fee.
Cleaning
Periodically wipe the case with a damp cloth and detergent; do not use
abrasives or solvents.
Calibration
Calibrate the Calibrator once a year to ensure that it performs according to its
specifications.
12
Measuring dc mA with LOOP POWER
Caution
To prevent damage to the unit under test, ensure that the
Calibrator is in the correct mode before connecting the test leads.
Loop power provide + 24V to power a transmitter and to read loop current
simultaneously.
To measure dc mA with LOOP POWER:
1. Press to step to LOOP POWER mode.
2. MEASURE mA and LOOP POWER are displayed.
3. Touch test lead probes to the circuit across the load or power source as
shown below.
To exit LOOP POWER, change measurement mode.
9

Introduction
The ELMA30C Loop Calibrator is a compact souring and measuring tool. The
Calibrator tests current loops of 0-24mA or 4-20mA and measures dc voltage to
50V. It comes with a set of alligator-clip test leads, a 9V alkaline battery, and this
Instruction Sheet.
Warnings and Cautions
To avoid electric shock, injury, or damage to the Calibrator :
l Use the Calibrator only as described in this Instruction Sheet or the
protection provided by the Calibrator may be impaired.
l Do not use the Calibrator around explosive gas, vapor, or dust.
l Inspect the Calibrator before use. Do not use it if appears damaged.
l Check the test leads for continuity, damaged insulation, or exposed
metal. Replace damaged test leads.
l Never apply more than 40V between any two terminals, or between
any terminal and earth ground.
l Use the proper terminals, mode, and range for your measuring or
sourcing application.
l To prevent damage to the unit under test, put the Calibrator in the
correct mode before connecting the test leads.
l When making connections, connect the COM test lead before the
live lead; when disconnecting, disconnect the live lead before the
COM lead.
l Never use the Calibrator with the case open.
l Make sure the battery door is closed before you use the Calibrator.
2
Push button Functions
Push button
Function

Power ON or OFF button.
Press to step through modes:
l SOURCE mA, V
l SIMULATE mA
l LOOP POWER ( 24V )
l MEASURE mA, V
Turn to increase or decrease current output.
Current output can be adjusted at a resolution of 1mA
or 100mA.
l To adjust the current in 1mA steps, simply turn
the knob.
l To adjust the current in 200mA steps, push in
and turn the knob.
Press to step the current up 25% of full scale
( 20mA ).
At full scale, press to step the current down
25% of full scale.
Press simultaneously to enter the Auto
Ramp mode and select a ramp form.
A continuously supplied or controlled mA ramping
signal is produced in one of three ramp forms.
(slow), (fast), or (step) identifies
the selected ramp form.
4

6
Electrical Specifiction
SOURCE / DC CURRENT
Range
Accuracy
0 - 24㎃(optional)
±(0.025% rdg + 5dgts)
4 - 20㎃(default)
SOURCE / DC VOLTAGE
Range
Resolution
Accuracy
2V
100㎶
±(0.05% rdg + 5dgts)
up to 15V non-specification
20V
1㎷
TX SIMULATOR
* 2wire transmitter simulation : External excitation voltage, 12V min, 30V max.
* The current sink levels are adjustable with accuracies as in the ㎃ source.
OUTPUT RAMP
* Current Ramp : 4 to 20 on all ranges.
* Ramp times : 50sec, 20sec, 5sec(3 ramp type).
* Ramp operation is also available in TX SIMULATOR function.
15

Auto Ramping the mA Output
Auto ramping allows you to continuously apply a varying current from the
Calibrator to a passive (sourcing) or active (simulate) loop. Your hands remain
free to rest the transmitter’s response.
Press to enter the Auto Ramp mode and step to a ramp type.
The Calibrator applies or controls a continuously repeating mA signal a 4-20mA
span in one of three ramp types:
SLOW ( ) 0% to 100% to 0% smooth ramp over 50 sec.
FAST ( ) 0% to 100% to 0% smooth ramp over 20 sec.
STEP ( ) 0% to 100% to 0% stair-ramp in 25% steps, pausing 5 sec at each
step.
8
Replacing the Battery
Warning
To avoid false readings, which could lead to electric shock or injury,
replace the battery as soon as (low battery indicator) appears on
the display.
Use only a single 9V battery, properly installed, to power the Calibrator.
The Calibrator uses a single 9V, alkaline battery (ANSI/NEDA 1604A or IEC
6LR61). To replace the battery:
1. Press to turn the Calibrator OFF.
2. Remove the test leads from the terminals.
3. Remove the holster.
4. Lift off the bottom case of the Calibrator.
5. Remove the battery.
6. Insert the replacement battery and restore the battery door. Make sure it
is securely in place.
13

Measuring dc mA
Caution
To prevent damage to the unit under test, ensure that the
Calibrator is in the correct mode before connecting the test leads.
To measure dc mA:
1. Press to step to MEASURE mode.
MEASURE mA is displayed.
2. Touch test lead probes to the circuit across the load or power source as
shown below.
10
Measuring dc Volts
Caution
To prevent damage to the unit under test, ensure that the
Calibrator is in the correct mode before connecting the test leads.
To measure dc Volts:
1. Press to step to MEASURE mode.
MEASURE V is displayed.
2. Touch test lead probes across the load or power source.
11