MTP 7205 User manual

MTP
INSTRUCTION MANUAL
Loop Calibrator
Model MTP 7205
MTP Instruments Inc.
WARRANTY
MTP Instruments warrants this instrument to
be free of defects in parts and workmanship for
one (1) year from date of shipment. This warranty
does not apply to fuses, test leads and defects
resulting from action of the user such as misuse,
improper wiring, operation outside of specification,
improper maintenance or repair, or unauthorized
modification. MTP Instruments specifically
disclaims any implied warranties or merchantability
or fitness for a specific purpose and will not be held
liable for any direct, indirect, incidental or
consequential damages. MTP Instruments total
liability is limited to repair or replacement of the
product.

INDEX
Page
1. Safety Information………………………….…. 1
2. Instrument Panel Layout and Functions….…3
3. Instrument Maintenance………………….….. 6
4. Power-on/off of Instrument………………..... 10
5. Output from Instrument………..……………. 11
6. Instrument Measurement…………………… 18
7. Setting Function…………………………..…. 22
8. Performance Index……………………..…… 24
9. Calibration……………………………………. 27
10. Notice of the Manual………………….…….. 38
Section One: Safety Information
To ensure the safety operation, the following signs are used
onlyas 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.
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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.
Section Two: Instrument Panel Layout and
Functions
LCD display
Area
Power
switch key
Single
step/auto-
switch key
25% single
step setting/
auto-ramp
key
mA%/unit
select key
Output/input
switch key
0% & 100%
of setting/
auto-ramp
start key
Input
digit select
key
 Output
value
setting key
Input/output
terminal
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2

Illustration of LCD Display Area
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.
：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.
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5

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.
Take out the batteries if the Instrument will not
be used for a long time.
Dirt 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
This Instrument is powered by two AA batteries
(IEC LR6).
Warning
To avoid electrical shock or personal injury:
Remove Test Leads from the Instrument
before opening the battery door.
Close and latch the Battery Cover before
using the meter.
Note
The new and old Batteries cannot be mixed.
Make sure the battery’s odes are in
accordance with the marks illustrated in
battery pool when replacing them.
Take out the batteries if the meter will not be
used for a long time.
Dispose 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;
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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);
4) Reinstall the cover;
5) Reinstall the meter’s protector.
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9

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.
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11

Output Operation Procedure
Function
Operation
%
Operation
Display
Setting Range
DCI
20mA
20 mA

%
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:
M A X
30V30V
M A XM A X
30V
IN P U T
O U T P U T
C O M
mA
V
+ L O O P
X M T+ m A -
+
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〔〕/〔〕to select the set
digits of the output;
5) Press the key〔〕/〔〕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.
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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 ‘’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 〔〕/〔〕to change the
output in a value of 25%, in which 0% denotes
4mA and 100% denotes 20mA;
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 ‘ ’、‘’、‘0’、‘FS’ will appear in the
display;
4) Press the key〔〕to be set to 100% and the
current output will be 20mA. Press the
key〔〕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
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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〔〕,〔〕,〔〕,〔〕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:
M A X
3 0 V3 0 V
M A XM A X
3 0 V
IN P U T
O U T P U T
C O M
mA
V
+ L O O P
X M T+ m A -
+
5 -- 2 5 V D C P o w e r
P o w e r
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.
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