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.
1

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
3
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.
4
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;
6
7

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.
8
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.
10
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.
12
13

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
14
15

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.
17
16

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
Operation
%
Operation
Display
Measurement Range
DCI 20 mA

DCV 28 V
20 mA

%
00.000 mA
-25.00 mA
%
0.000 V
-1.000～22.000 mA
-31.25～112.50 mA %
-0.2000～28.000 V
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:
18
19

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 5-3
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.
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 -
M
+
Figure 5-4
20
21

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.
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 -
+T r a n s m itt e r
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〔〕/〔〕, 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.
22
23

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)
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
24
25

General Specifications
- Power Supply: 21.5V alkaline batteries (LR6)
- Battery Life: about 400mA/3V under the condition
of 10mA with 1kΩ load
- 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(with holster)
- Accessories: Operation instruction, a set of CF-36
industrial test lead(with alligator clips attached to
probes)
- Safety: Certified as compliant to IEC1010
provisions(Safety standard issued by International
Electrotechnical Commission)
Section Nine: Calibration
Note
Calibration: 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
Usage：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.
Usage: 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.
26
27

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）
28
29

Ambient Condition for Calibration
- Ambient temperature: 23°C ± 1°C;
- 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 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;
30
31

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〔〕/〔〕and the key
〔〕/〔〕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
B Z - 1 0
HI
K E IT H L E Y 2 0 0 0
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.
32
33

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
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;
T R I G
O U T
A U X S C O P E
Lo
N O R M A L
Hi
S t a n d a rd S o u r c e
（ 5 5 2 0 A ）
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
34
35

〔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;
T R I G
O U T
A U X S C O P E
Lo
N O R M A L
Hi
S t a n d a rd S o u r c e
（ 5 5 2 0 A ）
Figure 10-3
5) Press the key〔STEP/AUTO〕and the LCD
displays ‘CAL FS’ , and repeat the operation
of steps 4.
36
37