Meatest M642 User manual

M642 Programmable Resistance Decade
Operation manual

M642 Programmable Resistance Decade MEATEST
3 revision 24, FW 2.000 Operation manual
Content
1. PREPARATION FOR USE .................................................................................................................. 5
1.1. INSPECTING PACKAGE CONTENTS, SELECTING THE INSTALLATION LOCATION .....................................
1.2. POWER ON ...................................................................................................................................... 6
1.3. WARM-UP TIME .............................................................................................................................. 6
1.4. SAFETY PRECAUTIONS ..................................................................................................................... 6
2. DESCRIPTION ..................................................................................................................................... 7
2.1. FRONT PANEL ................................................................................................................................. 7
2.2. REAR PANEL ................................................................................................................................... 9
3. OPERATION .......................................................................................................................................10
3.1. CONNECTION AND DISCONNECTION OF OUTPUT TERMINALS .............................................................10
3.2. WIRES CONNECTION .......................................................................................................................10
3.3. SETTING THE FUNCTION .................................................................................................................10
3.4. SETTING THE VALUE OF OUTPUT SIGNAL .........................................................................................17
3. . PARAMETER SETTINGS (SETTINGS MENU) ........................................................................................18
3.6. PRESET MENU ................................................................................................................................18
3.7. MAIN MENU ...................................................................................................................................19
3.8. CALIBRATION MODE ......................................................................................................................21
4. PERFORMANCE VERIFICATION TEST ........................................................................................24
5. REMOTE CONTROL .........................................................................................................................25
.1. RS232 INTERFACE .........................................................................................................................2
.2. GPIB INTERFACE (OPTION) ............................................................................................................26
.3. LAN INTERFACE (OPTION) .............................................................................................................27
.4. USB INTERFACE (OPTION) ..............................................................................................................28
. . COMMAND SYNTAX .......................................................................................................................29
.6. SCPI COMMAND TREE ...................................................................................................................30
.7. STANDARD STATUS DATA STRUCTURES .........................................................................................32
.8. SCPI STANDARD COMMANDS ........................................................................................................34
.9. SCPI COMMANDS ..........................................................................................................................38
.10. SCPI ERROR CODES .......................................................................................................................63
.11. COMPATIBLE COMMANDS ..............................................................................................................64
.12. DEMO PROGRAM ............................................................................................................................6
6. MAINTENANCE .................................................................................................................................66
6.1. FUSE REPLACING ............................................................................................................................66
6.2. EXTERNAL SURFACE CLEANING ......................................................................................................66
7. MODULE 19” (VERSION M642-VXX1X ..........................................................................................66
8. TECHNICAL DATA ............................................................................................................................67
9. ORDERING INFORMATION – OPTIONS .......................................................................................69
CERTIFICATE OF CONFORMITY ...........................................................................................................70

MEATEST M642 Programmable Resistance Decade
Operation manual 4
Figures
Figure 1 Starting Screen ......................................................................................................... 6
Figure 2 Front panel ............................................................................................................... 7
Figure 3 Display..................................................................................................................... 7
Figure 4 Rear panel ................................................................................................................ 9
Figure Resistance screen ................................................................................................... 10
Figure 6 Platinum screen ...................................................................................................... 11
Figure 7 Nickel screen ......................................................................................................... 11
Figure 8 User function screen ............................................................................................... 12
Figure 9 User function list .................................................................................................... 12
Figure 10 New user function ................................................................................................ 13
Figure 11 User function point editing ................................................................................... 13
Figure 12 User function edit ................................................................................................. 14
Figure 13 Timing screen ...................................................................................................... 14
Figure 14 Time sequence list ................................................................................................ 1
Figure 1 New sequence ...................................................................................................... 1
Figure 16 Timing sequence point editing .............................................................................. 16
Figure 17 Timing sequence edit ........................................................................................... 16
Figure 18 Numeric value entry ............................................................................................. 17
Figure 19 Settings menu ....................................................................................................... 18
Figure 20 Preset menu .......................................................................................................... 18
Figure 21 Main menu ........................................................................................................... 19
Figure 22 Password entry ..................................................................................................... 21
Figure 23 Calibration point screen ........................................................................................ 23
Figure 24 RS232 9 pin D-SUB MALE connector ................................................................. 2
Figure 2 IEEE488 connector .............................................................................................. 26
Figure 26 LAN connection 1 ................................................................................................ 27
Figure 27 LAN connection 2 ................................................................................................ 27
Figure 28 USB connector ..................................................................................................... 28
Figure 29 Status register overview ....................................................................................... 32
Figure 30 Module 19" rack, front panel ................................................................................ 66
Tables
Table 1 M642 Calibration points .......................................................................................... 22
Table 2 Verification - allowed deviations ............................................................................. 24
Table 3 RS232 cable connection .......................................................................................... 26
Table 4 OUTPut command structure .................................................................................... 41
Table Keyboard codes ....................................................................................................... 60
Table 6 SCPI error codes...................................................................................................... 63
Table 7 M642 Resistance accuracy....................................................................................... 68
Table 8 M642 Typical frequency response ........................................................................... 68
Table 9 M642 Pt simulation accuracy ................................................................................... 68
Table 10 M642 Ni simulation accuracy ................................................................................ 68

M642 Programmable Resistance Decade MEATEST
Operation manual
Basic information
Programmable resistance decade M642 is suitable for automated simulation of different
resistance sensors (temperature, pressure, position, force …). Internal design eliminates “zero
resistance effect” which is typical for most resistance decades.
Resistance value is created via appropriate combination of physical resistors. Decade is
equipped with built-in function of direct simulation of most frequent temperature Pt and Ni sensors.
Low thermal voltage relays and stable resistors are used as main parts of the decade. Actual set values
are displayed high resolution TFT display. M642 is sophisticated instrument with its own re-
calibration procedure. The procedure enables to correct any deviation in resistance without any
mechanical adjustment.
Instrument is especially suitable for automatic testing procedures. RS232 line (optionally
IEEE488, USB and Ethernet bus) is used for connecting decade to the computer.
1. Preparation for use
1.1. Inspecting package contents, selecting the installation location
Basic package includes the following items:
 Resistance decade M642
 RS232 cable
 User’s manual
 Test report
The instrument must be powered by 230/11 V – 0/60 Hz mains. Before powering on the
instruments, place it on a level surface. If the instrument was stored out of range of reference
temperatures, let it stabilize for one hour.

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Operation manual 6
1.2. Power on
 Before connecting the instrument to the mains, check the position of the mains voltage selector
located at the rear panel.
 Plug one end of the power cord into the connector located at the rear panel and connect the other
end of the power cord into a wall outlet.
 Switch on the mains switch located at the rear panel. Display is lit.
Figure 1 Starting Screen
 The instrument performs internal hardware checks for app. seconds.
 After the tests conclude, the instrument is set to “Startup” preset. This preset is adjustable
however, the instrument will always start with OPEN terminals.
1.3. Warm-up time
The instrument works after it is switched on and the initial checks complete. Specified
parameters are only guaranteed after the instrument warms up for 10 minutes.
1.4. Safety precautions
The instrument has been designed according to EN 61010-1:2011. Safety is ensured by the
design and by the use of specific component types.
The manufacturer is not liable for the damage caused by modification of the construction or
replacement of parts with non-original ones.
Safety symbols used on the equipment
Warning, reference to the documentation

M642 Programmable Resistance Decade MEATEST
7 Operation manual
2. Description
2.1. ront panel
Figure 2 Front panel
On the front panel there are located all main control keys, display and output terminals.
1 Output terminals
Four wire output terminals. Measuring (evaluation) circuit can be connected by 2, 3 or 4 wires. Both
sides (red and grey) are floating up to 00Vpk against the case (PE).
2 Ground terminal
Central ground terminal (protective earth) connected to the metal case of the instrument. It is
recommended to connect it to the “grey” output terminals if connected meter is not grounded.
3 Display
Figure 3 Display
A
B1
C1
B1
C2
B1
C3
D1
B1
D2
D3
B1
D4
B1
B2
B1
B1
B1
B3
B1
1 3 4 5 6 8
7 2

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Operation manual 8
The display is divided into four sections:
A. Information line
 Selected function (RESISTANCE, PLATINUM, …)
 Time
B. Main area
This section displays the set-up values of generated signals and the data related to the decade box
status. The section includes the following types of data:
1. Au iliary parameters
This section displays auxiliary parameters of actually selected function:
 Temperature standard (PT38 , PT3916, …)
 Switching mode (FAST, VIA OPEN, …)
 R0 resistance
2. Main value
There is displayed main value of selected function with the unit. There is displayed also actual
position of cursor ▼▲ if the parameter is in edit mode. Position of cursor can be changed
using keys ◄, ► and parameter can be changed using keys ▲,▼.
3. Output state
There is displayed resistance value connected to the output terminals.
C. Specification
This section displays specification and limits relating to the main value:
1. Specification
This section displays specification of the main value.
2. Ma imum voltage
This section displays maximum allowed voltage for the main value.
3. Ma imum current
This section displays maximum allowed current for the main value.
D. Softkey labels
The functions of these keys change during operation (depends on selected function and actual
display mode).
4 Softkeys
There are four keys next to the display with variable function. The functions of these keys change
during operation (depends on selected function and actual display mode). These four softkeys appear
in main function window:
Function – Function selection. See chapter 4.3
Settings – Function-specific parameter settings. See chapter 4.
Preset – One click setup of all function parameters. See chapter 4.6
Menu – General settings and parameters of all functions. See chapter 4.7

M642 Programmable Resistance Decade MEATEST
9 Operation manual
5 OPER (Operate key)
OPER key connects / disconnects selected value to the output terminals. Connected output terminals
are indicated by the lit LED in the key.
6 SHORT (Short key)
Active SHORT key (LED in the key is ON) replaces the main value with the short circuit. Also the
short circuit must be connected to the output terminals by the OPER key.
7 Cursor keys
Using these keys, the cursor can be controlled within allowed limits on the display. The keyboard
includes two buttons (◄, ►) which allow the cursor to be moved to the left or right. When a list is
displayed, (◄, ►) buttons skip through pages. Buttons (▲,▼) allow the user to increase or decrease
the number at the cursor position or move across items in a list.
The central SELECT key is used to select value you want to change (like TAB key).
8 Numeric keyboard
The keyboard allows the entry of numeric values on the display. ENTER button is used to confirm the
selection. CANCEL button can be used to cancel the entry.
Colors on display
Common rules are used for applied color of labels and values.
- Red color - displayed value is measured by the instrument. This color isn’t used in all versions.
- Blue color - parameters or values, which can be set-up or modified directly from front panel
keyboard or via Main menu.
- Black color - fix values, labels, notes, parameters which cannot be modified and for other fix text
with general information purpose.
Meaning of softkeys is shown on the right side of display. If there is no description next to the softkey,
the softkey is not active in selected function.
2.2. Rear panel
There are located power cord socket, power line fuse, power line voltage selector 11 /230V,
interface connectors RS232 and optionally LAN, USB and IEEE488 on the rear panel.
Figure 4 Rear panel

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Operation manual 10
3. Operation
3.1. Connection and disconnection of output terminals
Set value is connected (disconnected) to the output terminals after pressing OPER key.
Connected output terminals are indicated by the lit LED in the key.
Disconnected output terminals can be used for “Open terminals” simulation. “Short circuit” is
simulated after pressing SHORT key. Active SHORT key (LED in the key is ON) replaces the main
value with the short circuit. Also the short circuit must be connected to the output terminals by the
OPER key.
3.2. Wires connection
Output resistance is available on R output terminals. Available is 2, 3 and 4-wire connection.
Both sides (red and grey) are floating up to 00Vpk against the case (PE).
Ground terminal is connected to the metal case and to the protective earth (PE).
3.3. Setting the function
Function can be changed after pressing „Function“ softkey. New function is selected using
cursor keys ▲,▼ or display softkeys. Selection must be confirmed by pressing SELECT key or „OK“
softkey.
Device supports following functions:
Resistance
Offers direct setting of exact resistance value.
Figure 5 Resistance screen
Editable parameters:
Resistance value: 100 mΩ … 20 MΩ
Switching mode: FAST, SMOOTH, VIA OPEN, VIA SHORT