Orbit Merret OM 351 User manual

1
OM 351
3 1/2 DIGIT PROGRAMMABLE
DC VOLTMETER/AMMETER
AC VOLTMETER/AMMETER
PROCESS MONITOR
OHMMETER
THERMOMETER FOR PT 100/500/1 000
THERMOMETER FOR NI 1 000
THERMOMETER FOR THERMOCOUPLES
DISPLAY INST. FOR LIN. POTENTIOMETERS
GUARANTEE
YERS

2
INSTRUCIONS FOR USE OM 351
SAFETY INSTRUCTIONS
Please, read the enclosed safety instructions carefully and observe them!
These instruments should be safeguarded by isolated or common fuses (breakers)!
For safety information the EN 61 010-1 + A2 standard must be observed.
This instrument is not explosion-safe!
TECHNICAL DATA
Measuring instruments of the OM 351 series conform to the European regulation 89/336/EWG and the Ordinance
168/1997 Coll.
They are up to the following European and Czech standards:
CNS EN 55 022, class B
CNS EN 61000-4-2, -4, -5, -6, -8, -9, -10, -11
The instruments are applicable for unlimited use in agricultural and industrial areas.
CONNECTION
Supply of energy from the main line has to be isolated from the measuring leads.
ORBIT MERRET, spol. s r.o.
Vodnanska 675/30
198 00 Prague 9
Czech Republic
Tel: +420 - 281 040 200
Fax: +420 - 281 040 299
e-mail: [email protected]
www.orbit.merret.cz

3
1. CONTENTS
1. Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Instrument description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4. Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Programming modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Control keys functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Setting the DP and the (-) sign. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 Guide through minimum instrument setting, calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.2 User menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2.1 Internal values resetting (Tare) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2.2 Setting the limits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2.3 Setting the display brightness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3 Configuration menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.3.1 Configuration mode - INPUT
4.3.1.1 Internal values resetting (TARE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.3.1.2 Setting the measuring range, displacement, compensation and measuring rate. . . . . . . . . . . . . . . 16
4.3.1.3 Setting the external control input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.3.1.4 Setting functions of the control key (ENTER) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.3.2 Configuration mode - CHANNELS
4.3.2.1 Projection on the display (MIN, MAX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.3.2.2 Setting the digital filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.3.2.3 Setting the decimal point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.3.3 Configuration mode - OUTPUT
4.3.3.1 Cofiguration and setting the limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.3.3.2 Setting the data output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.3.3.3 Setting the analog output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.3.3.4 Setting the display brightness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.3.4 Configuration mode - SERVICE
4.3.4.1 Setting the menu access - resetting and limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.3.4.2 Restoration of the manufacture setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.3.4.3 Calibration of the input range (DU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.3.4.4 Setting new access password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.3.4.5 Instrument identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5. Method of measuring of the cold junction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
6. Data protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7. Error statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8. Technical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
9. Instrument dimensions and installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
10. Certificate of guarantee. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
1. CONTENTS

4
INSTRUCIONS FOR USE OM 351
2. INSTRUMENT DESCRIPTION
DESCRIPTION
The OM 351 model series are 3 1/2 digit programmable panel instruments, manufactured in the following
alternatives:
OM 351DC DC voltmeter/ammeter
OM 351AC AC voltmeter/ammeter
OM 351PM Process monitor
OM 351RTD Thermometer for Pt 100/500/1 000, Ni 1 000
OM 351T/C Thermometer for thermocouples
OM 351DU Display instrument for linear potentiometers
OM 351OHM Ohmmeter
The instruments are based on an 8-bit microcontroller with A/D converter, that secures high accuracy, stability and
easy operation of the instrument.
Programmable projection of the display
Calibration projection for the beginning and the end of the output range
setting the output type
Projection ±1999
Digital filters
Radius of insensitiveness adjustable in process units
Exponential average from 2…100 measurements
Mathematic functions
Tare* assigned to reset the display in case of non-zero input signal
External control
Hold display/instrument blocking
Lock locking the control keys or the access into Configuration menu
Tare tare activation
* only for types DC, PM, DU

5
2. INSTRUMENT DESCRIPTION
OPERATION
The instrument is set and controlled by five control keys located on the front panel. All programmable settings of the
instrument are realized in two adjusting modes:
Configuration menu (hereinafter referred to as „CM“) is protected by an optional number code and contains
complete instrument setting
User menu may contain arbitrary programming settings, defined in „CM“ with another selective restric
tion (see, change)
All programmable parameters are stored in the EEPROM memory (they hold even after the instrument is switched
off).
EXTENSION
Excitation is suitable for feeding sensors and converters. It has a galvanic isolation of 15 VDC.
Comparators are assigned to control two limit values with relay output. The limits have adjustbale hysteresis as
well as selectable delay of the switch-on. Reaching the preset limits is signalled by LED and simultaneously by the
switch-on of the relevant relay.
Data outputs are for their rate and accuracy suitable for transmission of the measured data for further projection or
directly into the control systems. We offer an isolated RS 232 and RS 485 with the ASCII protocol.
Analogue outputs will find their place in applications where further evaluating or processing of measured data
in external devices is required. We offer universal analog output with the option of selection of the type of output
- voltage/current. The value of analog output corresponds with the displayed data and its type and range are
selectable in the programming mode.
* only for type T/C

6
INSTRUCIONS FOR USE OM 351
3. CONNECTION
The lead for feeding the instrument should not be in the proximity of the incoming low-potential signals.
Contactors, motors with larger input power and other efficient elements should not be in the proximity of the instru-
ment.
The lead into the input of the instrument (the measured quantity) should be in sufficient distance from all power leads
and appliances. Provided this cannot be secured it is necessary to use shielded leads with connection to ground.
The instruments are tested in compliance with standards for use in industrial area, yet we recommend to abide by
the above mentioned principles.
Relay parameters listed in Technical data apply for resistance load. Upon connection of induction load we
recommend fitting the leads to relay 1 A with a fuse for
protection of maximum load.
Grounding on terminal „E“ has to be connected at all times
In RTD input with 2- or 3-wire connection it is necessary to link the unconnected inputs (13+14/15+16 or 13+14)
on the terminal block
S+
E- S- E+
S-
ES+ES-
ES+E-
12 3
-
E N
L
+
POWER SUPPLY
Analog output
TxD
GND
RxD
Rx/Tx- Rx/Tx+
GND
232
232
485
485
-
+
8910
GND
Hold/Lock
INPUT
-
+
GND
14 15 1611 12 13
CJC
Hold/Lock
OM 351T/C
OM 351RTD, OHM
L2
L1
4567

7
3. INSTRUMENT CONNECTION
12 3
-
E N
L
+
POWER SUPPLY
TxD
GND
RxD
Rx/Tx- Rx/Tx+
GND
232
232
485
485
8910
Analog output
-
+
GND
14 15 1611 12 13
Hold/Lock/Tare
z k
Hold/Lock/Tare
INPUT 2 INPUT 1
-
+
+
INPUT 3
+
GND
OM 351DC, PM
OM 351DU
L2
L1
4567
Excitation
-
+
Hold/Lock
INPUT 1 INPUT 3
GND
OM 351AC
MEASURING RANGES
Type Input 1 Input 2 Input 3
OM 351 AC Input 1 > 0…60 mV * 0…150 mV * 0…300 mV * 0…1 A * 0…5 A
OM 351 AC Input 2 > 0…10 V * 0…100 V * 0…150 V * 0…250 V * 0…450 V
OM 351 DC ±2/±20 mA ±0,2/±2 V ±20/±200 V
OM 351 DC 0…1/5 A 0…60/150 mV
OM 351 PM 0/4…20 mA 0…2 V 0…5/10 V
OM 351 OHM 0…200 Ohm * 0...2 kOhm * 0...100 kOhm * 5…105 Ohm

8
INSTRUCIONS FOR USE OM 351
4. INSTRUMENT SETTING
Setting and controlling the instrument is performed through 5 control keys on the front panel. By means of these controls
it is possible to browse through the operating program and to select and set the required values.
CONFIGURATION MODE USER MODE
• designated for professional service and maintenance • designated for instrument service
• complete instrument setting • may contain setting the limits, resetting
• access is password protected the tare and brightness, with restriction as
• authorization for "User mode" per the setting in "Configuration mode"
SYMBOLS USED IN THE INSTRUCTIONS
DC AC PM DU OHM RTD T/C Indicates the setting for given type of instrument
CONTROL KEYS FUNCTIONS
MENU ENTER LEFT DOWN UP
Measuring mode
menu access tare* tare projection*
Moving around in the menu
exit the menu without
saving
move to next level back to previous level move to next item move to next item
Setting/selecting - items
cancel setting without
saving
confirm selected item move down move up
Setting - numbers
cancel setting without
saving
confirm selected
number
move to higher
decade
change of current
figure - down -
change of current
figure - up -
1T2M
143.7
Relay status
ON the digit is lit
OFF the digit is not lit
OFF the digit is flashing
limits with restriction
(delay)
Function
T Tare
Measured value
* if the function is permitted in CM

9
4. INSTRUMENT SETTING
SETTING THE DECIMAL POINT AND THE MINUS SIGN
DECIMAL POINT
Its selection in calibration modes, upon modification of the number to be adjusted is performed by the
control key with transition behind the highest decade, when the decimal point starts flashing.
Positioning is performed by /.
Setting the decimal point may be performed correctly with the (+/-) signs being turned off..
MINUS SIGN
Setting of the minus sign is performed by the control key on higher decade. When editing the item the subtraction
must be made from the current number (e.g.: 13 > , on class 100 > -87)
ACCESS INTO THE CONFIGURATION MODE
CHA .
SER.
OUT.The code from manufacture is always
preset to 000
In case of loss of access password it is possible to
use the universal access code "177"
INP.
If the code is preset to 000 than the access into „CM“ is free, i.e. without call
for its setting
000
PAS
shift left
OK
w/o saving 0,1,2…
9,8,7…
+

10
INSTRUCIONS FOR USE OM 351
4.1 GUIDE THROUGH MINIMUM INSTRUMENT SETTING
Access into the „Configuration menu“
PAS Entering the introductory
access password
000 Standard manufacture
setting of the access
password
Selection of the measuring range/input type
PM
u 2.
i 4.
i 0.
u10.
u 5.
B
J
E
T
S
R
N
K
T/C
4-w
3-w
2-w
RTD
CHA .
SER.
OUT.
CL.T.
AUX.
CFG
KEY
INP.
M/S
MOD
20.V
2.V
0.2 V
199.V
20.i
2.i
60.m
1. a
150.m
DC - 2
DC - 1
5.a
MOD Setting the instrument
measuring range
DC Input
- setting the input range is dependant on the
ordered measuring range
PM Input
- setting the input range
RTD Input
- setting the type of connection
- in case of 2- or 3-wire connection it is
necessary to link the unconnected inputs (see
the connection)
T/C Input
- setting the type of thermocouple is dependant
on the ordered measuring range
- B type B Range 1
R type R Range 2
S type S
T type T
E type E Range 3
J type J
K type K
N type N
000
PAS
shift left
OK
w/o saving 0,1,2…
9,8,7…
+

11
Setting projection on the display
CHA.
SER.
OUT.
MI N
FI L .
MAX
FOR.
INP.
MI N .Setting the display
projection for minimum value
of the input signal
- range of the setting is ±1999
MAX Setting the display
projection for maximum
value of the input signal
- range of the setting is ±1999
Input type Displayed items of the menu
DC MIN, MAX
PM MIN, MAX
DU MIN, MAX
OHM MIN, MAX, *LEA.
RTD *LEA., r. Ad.
T/C CJC., t. CJ.
* only for 2-wire
4. GUIDE THROUGH MINIMUM INSTRUMENT SETTING
If the code is preset to 000 than the access into „CM“ is free, i.e. without call
for its setting

12
INSTRUCIONS FOR USE OM 351
4.2 USER MENU
• designated for instrument service
• may contain setting the limits, analog and data output and brightness, with restriction as per the setting in "Con-
figuration mode"
4.2.1 RESETTING THE INTERNAL VALUES
OUT.
CL.t.INP.
CL.t .Tare resetting
Adjustable authorization of access into items, see page 26
Projection of items and their accessability
depends on the setting of access rights in the
„Configuration menu“
23 .6
OUT.LIM.
Setting limits,
hysteresis and
delay
OUT.
Setting limits and display brightness
INP.CL.t..
Tare resetting
INP.
Tare resetting
bri.
Setting the
display bright-
ness

13
4. INSTRUMENT SETTING - CONFIGURATION MODE
4.2.2 LIMITS - ENTERING THE VALUES
INP.LIM
BRi .
L 1
L 2
LI M .
Ti m .
HYS.OUT.
LI M Entering the limit values
for status evaluations
L 1Setting for Limit 1
L 2 Setting for Limit 2
LI M .Setting the limit for relay
switch-on
- in full display range
HYS.Setting hysteresis only in
(+) values
- in full display range
ti m .Setting the delayed
switch-on of the limit
- in range 0…99,9 s
4.2.3 DISPLAY BRIGHTNESS
OUT.
LI M
BRi..
INP.
50%
25%
75%
100% DEF
BRi .Setting the display
brightness
- by selecting the display brightness we may
react properly to light conditions in place of
location of the instrument
- brightness in the programming menu is
always 100 %
25 % Display brightness = 25 %
50 % Display brightness = 50 %
75 % Display brightness = 75 %
100 % Display brightness = 100 %
Adjustable authorization of access into items, see page 27

14
INSTRUCIONS FOR USE OM 351
4.3 CONFIGURATION MENU
• designated for professional service and maintenance
• complete instrument setting
• access is protected by password or a shorting link on the input connector
• authorization for "User mode"
Upon delay longer than 30 s the programming mode is automatically dis-
continued and the instrument itself switches back to the measuring mode
23.6
Entering the access password
PAS
000
OUT.LI M .DAT.A.O.
SER.ACC.RES .N.PA.
Setting the
limits, hysteresis
and delay
Setting the data
output
Setting the
analog output
Setting the
access rights
into „UM“
Restoring the
manufacture
setting/
calibration
Id .
Instrument
identification
Setting
new access
password
OUT.
Setting the outputs
SER.
Service functions, authorization, calibration
+
BRi .
Setting the
display
brightness
CHA .MI N FI L .
Setting proje-
ction for min.
input signal
Setting proje-
ction for max.
input
Setting digital
filters
CHA .
Instrument setting, calibration
FOR.
Setting the
decimal point
MAX
INP.CL.t.AUX.
Resetting inter-
nal values
Instrument con-
figuration
Auxiliary input
function
INP.
Instrument setting
KEY
Control-key
function
CFG .
CAL
Instrument
calibration

15
4. INSTRUMENT SETTING - CONFIGURATION MODE
4.3.1 CONFIGURATION MODE - INPUT
CHA .
SER.
OUT.
CL.t.
AUX.
CFG
KEY
INP.
The basic instrument functions are adjusted
in this menu
CL.t.Internal values resetting
CFG Selecting the measuring
range and measuring rate
AUX.Setting the external control
input function
KEY Setting the control-key
function
4.3.1.1 INTERNAL VALUES RESETTING
CHA .
SER.
OUT.
CL.t.
AUX.
CFG
KEY
INP.
CL.t .Tare resetting

16
INSTRUCIONS FOR USE OM 351
4.3.1.2.1 SETTING THE MEASURING RANGE
PM
u 2.
i 4.
i 0.
u10.
u 5.
B
J
E
T
S
R
N
K
T/C
4-w
3-w
2-w
RTD
CHA .
SER.
OUT.
CL.T.
AUX.
CFG
KEY
INP.
M/S
MOD
20.V
2.V
0.2 V
199.V
20.i
2.i
60.m
1. a
150.m
DC - 2
DC - 1
5.a
MOD Setting the instrument
measuring range
PM Input
- setting the input range is dependant on the
ordered mmeasuring range
- 0.2 u ±0,2 V Range 1
2.u ±2 V
20.u ±20 V
199.u ±200 V
60.m ±60 mV Range 2
150.m ±150 mV
1.A ±1 A
5.A ±5 A
PM Input
- setting the input range
- u 2. 0...2 V
u 5. 0...5 V
u 10. 0...10 V
i 0. 0...20 mA
i 4. 4...20 mA
RTD Input
- setting the type of connection
- in case of 2- or 3-wire connection it is
necessary to link the unconnected inputs (see
the connection)
T/C Input
- setting the type of thermocouple is dependant
on the ordered measuring range
- B type B Range 1
R type R Range 2
S type S
T type T
E type E Range 3
J type J
K type K
N type N

17
4. INSTRUMENT SETTING - CONFIGURATION MODE
4.3.1.2.2 SHIFTING THE BEGINNING OF THE RANGE RTD OHM
CHA .
SER.
OUT.
CL.t .
AUX.
CFG
KEY
INP.
M/S
MOD
LEA .
r.Ad.
r.Ad.Shifting the beginning of
the measuring range
- in cases when it is necessary to shift the
beginning of the range by certain value, e.g.
when sensor is used in a measuring head
- entered directly in Ohm
4.3.1.2.3 COMPENSATION OF 2-WIRE CONDUCT RTD OHM
CHA .
SER.
OUT.
CL.t .
AUX.
CFG
KEY
INP.
M/S
MOD
LEA .
r.Ad.
YES
LEA .Compensation of 2-wire
conduct
- for measurement accuracy it is necessary to
perform compensation of the conduct always
in case of 2-wire connection
- entered directly in Ohm
- prior to confirmation of the displayed
challenge „YES“ it is necessary to substitute
the sensor at the end of the conduct by a
short circuit
- preset from manufacture to „0“
4.3.1.2.4 SETTING THE METHOD OF EVALUATION OF THE COLD JUNCTION T/C
In .1
E.2
E.1
In .2CHA .
SER.
OUT.
CL.t .
AUX.
CFG
KEY
INP.
M/S
MOD
t.C.J.
CJC
CJC.Method of evaluation of
the cold junction
- description of the method of evaluation of the
cold junction is in chapter 5, page 30
In .1. Measurement without
reference thermocouple
- cold junction measurement on the instrument
brackets
In .2.Measurement with reference
thermocouple
- cold junction measurement on the instrument
brackets with anti-seris connection of
ref.thermocouple
E.1 Measurement without
reference thermocouple- -
- whole measuring set works at the same and
constant temperature
E.2Measurement with reference
thermocouple
- upon the use of compensation box

18
INSTRUCIONS FOR USE OM 351
4.3.1.2.5 SETTING THE TEMPERATURE OF THE COLD JUNCTION T/C
CHA .
SER.
OUT.
CL.t .
AUX.
CFG
KEY
INP.
M/S
MOD
t.C.J.
CJC
t C.J.Setting the temperature
of the cold junction
- range 0…98°C with compensation box
4.3.1.2.6 SETTING THE INSTRUMENT MEASURING RATE
DEF
0.5
10.0
5.0
2.5
1. 2CH A .
SER.
OUT.
CL.t.
AUX.
CFG
KEY
INP.
M.P.S.
MOD
M.P.S.Setting the measuring
rate
0.5Rate - 0,5 measurements/s
1. 2Rate - 1,2 measurements/s
2.5Rate - 2,5 measurements/s
5.0Rate - 5 measurements/s
10.0Rate - 10 measurements/s
4.3.1.3 EXTERNAL INPUT FUNCTION SELECTION
LOC .
TAR.
HLD.CHA .
SER.
OUT.
CL.t.
AUX.
CFG
KEY
INP.DEF
AUX.External input function
selection
LOC .LOCK, locking the control
keys on the instrument
HLD.HOLD, stop measuring of
the entire instrument
TAR.TARE - Tare activation
The method and the process of setting of the cold junctions is described in a separate
chapter on page 30
* only for types DC, PM, DU

19
4.3.1.4 SETTING OTHER FUNCTIONS OF THE „ENTER“ KEY
DI S .
ENA .CHA .
SER.
OUT.
CL.t.
AUX.
CFG
KEY
INP.
DEF
KEY Setting other functions of
the control-key
DI S .Without function
EN b .Activation of keys for tare
projection and resetting*
4. INSTRUMENT SETTING - CONFIGURATION MODE

20
INSTRUCIONS FOR USE OM 351
4.3.2 CONFIGURATION MODE - CHANNELS
CHA.
SER.
OUT.
Mi N
FI L .
MAX
FoR.
INP.
In this menu instrument parameters are set
Mi N Setting display projection for
minimum value of the input
signal

MAX Setting display projection for
maximum value of the input
signal

FI L .Setting the digital filters

FoR.Setting the decimal point

Input type Setting options
DC  
AC  
PM  
DU  
OHM  
RTD  
T/C 
T/C
4.3.2.1 PROJECTION ON THE DISPLAY DC AC PM DU OHM
CHA.
SER.
OUT.
Mi N
FI L .
MAX
FoR.
INP.
Mi N .Setting display projection
for minimum value of the
input signal
- range of the setting is ±1999
MAX Setting display projection
for maximum value of the
input signal
- range ot the setting is ±1999