DH Instruments MFC-CB User manual

©2001~2007 DH Instruments, a Fluke Company
MFC-CB™
MFC Control Box
Operation and Maintenance Manual

MFC-CB™ Operation and Maintenance Manual
©2001~2007 DH Instruments, a Fluke Company
©2001~2007 DH Instruments, a Fluke Company All rights reserved.
Information in this document is subject to change without notice. No part of this document may be reproduced or
transmitted in any form or by any means, electronic or mechanical, for any purpose, without the express written
permission of DH Instruments, a Fluke Company 4765 East Beautiful Lane Phoenix AZ 85044-5318 USA.
DH Instruments strives to ensure the accuracy of its published materials; however, no warranty, expressed or
implied, is provided. DH Instruments disclaims any responsibility or liability for any direct or indirect damages
resulting from the use of the information in this manual or products described in it. Mention of any product does not
constitute an endorsement by DH Instruments of that product. This manual was originally composed in English and
subsequently translated into other languages. The fidelity of the translation cannot be guaranteed. In case of conflict
between the English version and other language versions, the English version predominates.
DH Instruments, DH, DHI, MFC-CB, molbox, MFC-CB, molbloc and CalTool are trademarks, registered and
otherwise, of DH Instruments, a Fluke Company.
Document No. 550123b-01
040330
Printed in the USA.

TABLE OF CONTENTS
Page I©2001~2007 DH Instruments, a Fluke Company
T
TA
AB BL LE E O
OF
F C
CO
ON NT TE EN NT TS S
TABLE OF CONTENTS................................................................................ I
TABLES...................................................................................................IV
FIGURES .................................................................................................IV
ABOUT THIS MANUAL...............................................................................V
1. INTRODUCTION .................................................................................... 1
1.1 PRODUCT OVERVIEW .............................................................................................................................1
1.2 SPECIFICATIONS .....................................................................................................................................1
1.2.1 GENERAL SPECIFICATIONS ...........................................................................................................................1
1.2.2 ANALOG OUTPUT SPECIFICATIONS .............................................................................................................2
1.2.3 ANALOG INPUT SPECIFICATIONS .................................................................................................................2
1.2.4 VALVE TEST POINT SPECIFICATIONS ..........................................................................................................2
1.2.5 FRONT AND REAR PANELS............................................................................................................................3
1.2.5.1 FRONT PANEL ..................................................................................................................................3
1.2.5.2 REAR PANEL ....................................................................................................................................4
1.2.6 INTERNAL VIEW ...............................................................................................................................................5
1.2.6.1 DISPLAY ............................................................................................................................................5
1.2.6.2 POWER SUPPLY ..............................................................................................................................5
1.2.6.3 POWER ENTRY MODULE ................................................................................................................6
1.2.6.4 MICRO BOARD .................................................................................................................................6
1.2.6.5 MAIN BOARD ....................................................................................................................................6
2. INSTALLATION..................................................................................... 7
2.1 UNPACKING AND INSPECTION ..............................................................................................................7
2.1.1 REMOVING FROM PACKAGING .....................................................................................................................7
2.1.2 INSPECTING CONTENTS .................................................................................................................................7
2.2 SITE REQUIREMENTS..............................................................................................................................8
2.3 INITIAL SETUP..........................................................................................................................................8
2.3.1 PREPARING FOR OPERATION .......................................................................................................................8
2.3.2 MFC-CB TO MFC OR MFM CONNECTION......................................................................................................8
2.4 POWER UP AND VERIFICATION.............................................................................................................8
2.4.1 POWER UP ........................................................................................................................................................8
2.4.2 CHECK/SET SECURITY LEVEL .......................................................................................................................9
3. OPERATION ....................................................................................... 11
3.1 GENERAL MANUAL OPERATION .........................................................................................................11
3.1.1 MAIN RUN SCREEN........................................................................................................................................11
3.1.2 GENERAL OPERATING PRINCIPLES ...........................................................................................................12
3.1.2.1 KEYPAD LAYOUT AND PROTOCOL .............................................................................................12
3.1.2.2 SOUNDS..........................................................................................................................................13
3.1.2.3 SOFT [ON/OFF] KEY.......................................................................................................................14
3.1.2.4 ACTIVE DEVICE CHANNEL INDICATION......................................................................................14
3.1.2.5 DIRECT FUNCTION KEYS SUMMARY ..........................................................................................14
3.2 DIRECT FUNCTION KEYS......................................................................................................................16
3.2.1 [K].....................................................................................................................................................................16
3.2.2 [UNIT] ...............................................................................................................................................................17
3.2.3 [POWER]..........................................................................................................................................................18
3.2.4 [DISPLAY]........................................................................................................................................................19
3.2.4.1 <1DEV1&2> .....................................................................................................................................20
3.2.4.2 <2SUM> ...........................................................................................................................................21
3.2.4.3 <3DIF>(DIFFERENCE)....................................................................................................................21
3.2.4.4 <4RATIO> ........................................................................................................................................22
3.2.4.5 <5UNIT>...........................................................................................................................................23

MFC-CB™ Operation and Maintenance Manual
©2001~2007 DH Instruments, a Fluke Company Page II
3.2.4.6 <6CLEAN> .......................................................................................................................................24
3.2.5 [DEV1/2] ...........................................................................................................................................................25
3.2.6 [MFC]................................................................................................................................................................25
3.2.7 [DRIVERS] (OPTIONAL) .................................................................................................................................27
3.2.8 [SET MFC]........................................................................................................................................................27
3.2.9 [←] AND [→] (JOG MFC SET POINT) ............................................................................................................28
3.3 [SETUP] ...................................................................................................................................................29
3.3.1 <1MFC> (EDIT MFC PROFILES) ....................................................................................................................30
3.3.2 <2JOG> ............................................................................................................................................................31
3.3.3 <3RES> (RESOLUTION) .................................................................................................................................32
3.3.4 <4FLOWU> (FLOW UNITS).............................................................................................................................32
3.3.5 <5ADJ> (ADJUSTMENT) ................................................................................................................................33
3.4 [SPECIAL] ...............................................................................................................................................35
3.4.1 <1RESET>........................................................................................................................................................36
3.4.1.1 <1SETS>..........................................................................................................................................36
3.4.1.2 <2UNITS> ........................................................................................................................................37
3.4.1.3 <3MFC> ...........................................................................................................................................37
3.4.1.4 <4CAL> ............................................................................................................................................37
3.4.1.5 <5ALL>.............................................................................................................................................38
3.4.2 <2LEVEL> ........................................................................................................................................................38
3.4.2.1 SECURITY LEVELS ........................................................................................................................39
3.4.3 <3PREFS>........................................................................................................................................................42
3.4.3.1 <1SCRSVR> ....................................................................................................................................42
3.4.3.2 <2SOUND> ......................................................................................................................................43
3.4.3.3 <3TIME> ..........................................................................................................................................43
3.4.3.4 <4ID> ...............................................................................................................................................44
3.4.4 <4CAL> ............................................................................................................................................................45
3.4.5 <5REMOTE> ....................................................................................................................................................45
3.4.5.1 <1COM1> AND <2COM2> ..............................................................................................................46
3.4.5.2 <3IEEE-488>....................................................................................................................................46
3.4.5.3 <4RS232 SELF-TEST>....................................................................................................................46
3.4.6 <6XBOX> .........................................................................................................................................................47
3.4.7 <7LOG>............................................................................................................................................................49
4. REMOTE OPERATION ......................................................................... 51
4.1 OVERVIEW ..............................................................................................................................................51
4.2 INTERFACING.........................................................................................................................................51
4.2.1 RS232 INTERFACE .........................................................................................................................................52
4.2.1.1 COM1...............................................................................................................................................52
4.2.1.2 COM2...............................................................................................................................................53
4.2.2 IEEE-488 (GPIB) ..............................................................................................................................................53
4.3 COMMANDS............................................................................................................................................54
4.3.1 COMMAND SYNTAX .......................................................................................................................................54
4.3.2 COMMAND SUMMARY ...................................................................................................................................54
4.3.3 ERROR MESSAGES .......................................................................................................................................55
4.3.4 COMMAND DESCRIPTIONS...........................................................................................................................56
4.3.4.1 IEEE STD. 488.2 COMMON AND STATUS COMMANDS..............................................................56
4.3.4.2 MFC-CB COMMANDS.....................................................................................................................59
4.4 STATUS SYSTEM ...................................................................................................................................74
4.4.1 STATUS REPORTING SYSTEM .....................................................................................................................74
4.4.1.1 STATUS BYTE REGISTER .............................................................................................................74
4.4.1.2 STANDARD EVENT REGISTER .....................................................................................................76
5. MAINTENANCE, ADJUSTMENTS AND CALIBRATION ............................ 77
5.1 OVERVIEW ..............................................................................................................................................77
5.2 VERIFICATION AND CALIBRATION OF ELECTRICAL SIGNALS .......................................................78
5.2.1 PRINCIPLE.......................................................................................................................................................78
5.2.2 FRONT PANEL ADJUSTMENT OF ELECTRICAL SIGNALS........................................................................79
5.2.2.1 PRINCIPLES....................................................................................................................................79
5.2.2.2 <1SENSE>.......................................................................................................................................80
5.2.2.3 <2MEAS> (MEASURE)....................................................................................................................80
5.2.2.4 <3SET> ............................................................................................................................................81
5.2.2.5 <4VALVE> .......................................................................................................................................83
5.2.2.6 <5CAL DATE> .................................................................................................................................83
5.3 RELOADING EMBEDDED SOFTWARE INTO FLASH MEMORY .........................................................84

TABLE OF CONTENTS
Page III ©2001~2007 DH Instruments, a Fluke Company
6. TROUBLESHOOTING .......................................................................... 85
6.1 OVERVIEW ..............................................................................................................................................85
7. APPENDIX.......................................................................................... 87
7.1 CALCULATIONS .....................................................................................................................................87
7.1.1 ELECTRICAL SET POINT AND MEASUREMENT CALCULATIONS ...........................................................87
7.1.2 CONVERTING BETWEEN ELECTRICAL UNITS AND FLOW OR %FS UNITS............................................88
7.2 DEVICE CHANNEL CONNECTORS AND CABLES...............................................................................89
7.2.1 POPULAR CONFIGURATIONS ......................................................................................................................91
7.3 DRIVERS .................................................................................................................................................92
7.4 GLOSSARY .............................................................................................................................................94
7.5 WARRANTY STATEMENT......................................................................................................................95

MFC-CB™ Operation and Maintenance Manual
©2001~2007 DH Instruments, a Fluke Company Page IV
T
TA
AB BL LE ES S
Table 1. MFC-CB Delivery List ................................................................................................................ 7
Table 2. Summary of MFC-CB Direct Function Key Operation............................................................. 15
Table 3. Available Flow Units ................................................................................................................ 33
Table 4. Security Levels - Functions NOT Executed Per Function/Level ............................................. 40
Table 5. COM1 and COM2 Available Settings ...................................................................................... 46
Table 6. COM1 DB-9F Pin Designation................................................................................................. 52
Table 7. COM2 DB-9M Pin Designation................................................................................................ 53
Table 8. Command Summary................................................................................................................ 54
Table 9. Error Messages ....................................................................................................................... 55
Table 10. Status Byte Register................................................................................................................ 74
Table 11. Standard Event Register .........................................................................................................76
Table 12. Troubleshooting Checklist .......................................................................................................85
Table 13. MFC-CB DEV1 and DEV2 Connector Pin Out ........................................................................ 89
Table 14. Common MFC Connector Pin Out .......................................................................................... 91
Table 15. Brooks MFC Connector Pin Out.............................................................................................. 92
Table 16. Driver Output ........................................................................................................................... 92
Table 17. External Drivers ....................................................................................................................... 93
Table 18. DHI Authorized Service Providers........................................................................................... 95
F
FI
IG GU UR RE ES S
Figure 1. MFC-CB Front Panel ................................................................................................................. 3
Figure 2. MFC-CB Rear Panel.................................................................................................................. 4
Figure 3. MFC-CB Internal View............................................................................................................... 5
Figure 4. MFC-CB Keypad Layout.......................................................................................................... 12
Figure 5. MFC-CB with MFC Switchbox Schematic ............................................................................... 48
Figure 6. Status Byte Register................................................................................................................ 74
Figure 7. Driver Cable Schematic........................................................................................................... 93

ABOUT THIS MANUAL
©2001~2007 DH Instruments, a Fluke Company Page v
A
AB
BO OU UT T T
TH
HI IS S M
MA
AN NU UA AL L
This manual provides the user with the basic information necessary to set up and operate an
MFC-CB MFC Control Box. It also includes a great deal of additional information provided to help
you optimize MFC-CB use and take full advantage of its many features and functions.
Before using the manual, take a moment to familiarize yourself with the Table of Contents structure.
All first time MFC-CB users should read Sections 1 and 2. Section 3 provides a comprehensive
description of general MFC-CB operating principles. Section 4 is for remote operation from an
external computer. Section 5 provides maintenance and calibration information. Section 6 is a quick
troubleshooting guide. Use Section 6 to troubleshoot unexpected MFC-CB behavior based on the
symptoms of that behavior.
Certain words and expressions have specific meaning as they pertain to MFC-CB. Section 7.4 is
useful as a quick reference for the definition of specific words and expressions as they are used in
this manual.
FOR THOSE OF YOU WHO “DON’T READ MANUALS”, GO DIRECTLY TO SECTION 2.3, INITIAL SETUP, TO
SET UP YOUR MFC-CB. THEN GO TO SECTION 2.4, POWER UP AND VERIFICATION. THIS WILL GET YOU
RUNNING QUICKLY WITH MINIMAL RISK OF CAUSING DAMAGE TO YOURSELF OR YOUR MFC-CB.
THEN… WHEN YOU HAVE QUESTIONS OR START TO WONDER ABOUT ALL THE GREAT FEATURES
YOU MIGHT BE MISSING, GET INTO THE MANUAL!
Manual Conventions
(CAUTION) is used in throughout the manual to identify user warnings and cautions.
(NOTE) is used throughout the manual to identify operating and applications advice and
additional explanations.
[ ] indicates direct function keys (e.g., [UNIT]).
< > indicates MFC-CB screen menus and displays (e.g., <1yes>).

MFC-CB™ Operation and Maintenance Manual
©2001~2007 DH Instruments, a Fluke Company Page vi
N
NO
OT TE ES S

1. INTRODUCTION
Page 1 ©2001~2007 DH Instruments, a Fluke Company
1. INTRODUCTION
1.1 PRODUCT OVERVIEW
MFC-CB is a two channel analog input/output device designed to set and read voltage and current
signals from analog Mass Flow Controllers (MFC) and Mass Flow Meters (MFM). A DH Instruments
MFC Switchbox may be connected to either channel allowing switching of the channel’s control
between five permanently powered channels. As an option, (8) external 12 V drivers can also be
included to excite peripheral equipment such as solenoid valves.
MFC-CB provides a local user interface via a front panel key pad and display and includes advanced
on-board functions. Remote communication capability is supported by RS232 and IEEE-488 interfaces.
MFC-CB is intended for applications where convenient local and remote control of analog MFCs and/or
MFMs is desired, for example in setting up an MFC calibration system using a DH Instruments
molbox1 or molbox RFM flow standard.
1.2 SPECIFICATIONS
1.2.1 GENERAL SPECIFICATIONS
Power Requirements 100 to 240 VAC, 50 to 60 Hz, 38 VA max. consumption
Power Supply Output ±15 VDC @ 1 Amp max, 0.5 Amp per channel
Operating Temperature Range 15 to 35 °C
Storage Temperature Range -20 to 70 °C
Warm Up Time 1 hour for best electrical measurement specifications
Vibration Meets MIL-T-28800D
Weight 2 kg (4.4 lb)
Dimensions 8 cm H x 22.5 cm W x 20 cm D
(3.1 in. x 8.9 in. x 7.9 in.) approx.
Microprocessor Motorola 68302, 16 MHz
Communication Ports RS232 (COM1), RS232 (COM2), IEEE-488,
DHI MFC Switchbox
Electrical Connections DEV1 and DEV2: 25 pin female DSUB
CE Conformance Available. Must be specified.

MFC-CB™ Operation and Maintenance Manual
©2001~2007 DH Instruments, a Fluke Company Page 2
1.2.2 ANALOG OUTPUT SPECIFICATIONS
VOLTAGE OUTPUT
Range 0 to 6 VDC
Uncertainty ±0.015 %FS
Resolution 0.1 mVDC
Output Impedance (max) 100 Ωper channel
Load Impedance (min) 10 kΩper channel
Short Circuit Protection Yes (indefinite)
CURRENT OUTPUT
Range 4 to 20 mA
Uncertainty ±0.025 %FS
Resolution 0.4 μA
Maximum Load 500 Ω(compliance voltage: 10 VDC)
Short Circuit Protection Yes (indefinite)
1.2.3 ANALOG INPUT SPECIFICATIONS
VOLTAGE INPUT (MEASURE AND SENSE)
Range 0 to 6 VDC
Min to Max Measurable -0.25 to 6.00 VDC
Uncertainty ±0.015 %FS
Resolution 0.1 mVDC
Input Impedance (min) 1 MΩ
CURRENT INPUT (MEASURE)
Range 4 to 20 mA
Min to Max Measurable 4 to 20 mA
Uncertainty ±0.025 %FS
Resolution 0.4 μA
Input Impedance 250 Ω
1.2.4 VALVE TEST POINT SPECIFICATIONS
Range +2 to +15 VDC (in reference to -15 VDC)
Accuracy ±0.1 %FS
Resolution 0.3 mVDC

1. INTRODUCTION
Page 3©2001~2007 DH Instruments, a Fluke Company
1.2.5 FRONT AND REAR PANELS
1.2.5.1 FRONT PANEL
The front panel assembly provides a 2 x 20 vacuum fluorescent display, a membrane
keypad for local user interface and a SOFT ON/OFF key.
1. Display
2. Multi-Function Keypad
3. Remote Communication Indicator
4. SOFT ON/OFF Key and Indicator
Figure 1. MFC-CB Front Panel
1
2
3
4

MFC-CB™ Operation and Maintenance Manual
©2001~2007 DH Instruments, a Fluke Company Page 4
1.2.5.2 REAR PANEL
The rear panel assembly provides DEVICE1 and DEVICE2 analog input/output
channels, a 12 V drivers connection, communications interfaces and the power
connection module.
1. Electrical power connector (IEC60320)
2. Power ON/OFF switch
3. Connector for 12V DRIVERS
4. Connector for MFC Switchbox control
5. DEVICE1 electrical input/output connection
6. DEVICE2 electrical input/output connection
7. COM2 connection for pass through communication
8. COM1 connection for host computer
9. IEEE-488 connection for host computer
Figure 2. MFC-CB Rear Panel

1. INTRODUCTION
Page 5©2001~2007 DH Instruments, a Fluke Company
1.2.6 INTERNAL VIEW
1. Power entry module
2. Micro board
3. Main board (under power supply
and micro board)
4. Display
5. Power supply
Figure 3. MFC-CB Internal View
1.2.6.1 DISPLAY
2 x 20 vacuum fluorescent, alpha-numeric display mounted to front panel.
1.2.6.2 POWER SUPPLY
MFC-CB has one 65 W switching power supply with three DC voltage outputs:
•5 VDC @ 7 Amp max.
•+15 VDC @ 2.5 Amp max.
•-15 VDC @ 2 Amp max.

MFC-CB™ Operation and Maintenance Manual
©2001~2007 DH Instruments, a Fluke Company Page 6
1.2.6.3 POWER ENTRY MODULE
Includes ON/OFF switch, fuse (1 Amp @ 250 VAC) and AC filter.
1.2.6.4 MICRO BOARD
The micro board supports a Motorola 68302 micro-controller, EPROM, EEPROM,
128k x 16 bit NVRAM, 8 Mbit flash memory; RS232 and IEEE-488.2
communications; keypad and display control. An I/O port controls other ports and
devices within MFC-CB.
1.2.6.5 MAIN BOARD
The main board is controlled by the micro board (see Section 1.2.6.4). The main
board supports the drivers for the 12 V external drivers, MFC/MFM voltage supply,
MFC/MFM control signal input and output.

2. INSTALLATION
Page 7 ©2001~2007 DH Instruments, a Fluke Company
2. INSTALLATION
2.1 UNPACKING AND INSPECTION
2.1.1 REMOVING FROM PACKAGING
MFC-CB is delivered, along with its standard accessories, in a corrugated container with
polyurethane inserts to hold it in place.
Remove the MFC-CB and its accessories from the shipping container and remove each item
from its protective plastic bag.
2.1.2 INSPECTING CONTENTS
Check that all items are present and have no visible damage.
An MFC-CB is delivered complete with:
Table 1. MFC-CB Delivery List
DESCRIPTION PART #
MFC-CB Mass Flow Control Box 401710 or 401710-CE
Report of Calibration 550100
ACCESSORIES
Operation and Maintenance Manual 550123
Power Cord (7.5 ft.) 100770 or 100770-CE
(2) MFC Cable and Connections Kit 401230 or 401230-CE
molbox1/MFC-CB Analog Calibration Cable 401256
Drivers Connector 401635 (optional)
General Accessories Disk (Important: Includes
system support software and documentation)
102987

MFC-CB™ Operation and Maintenance Manual
©2001~2007 DH Instruments, a Fluke Company Page 8
2.2 SITE REQUIREMENTS
Install MFC-CB on any stable surface at a convenient height. The front feet are extendible so that
the unit can be inclined for easier viewing.
MFC-CB can also be mounted in a standard 19-in. rack using the optional rack mount kit
(P/N 401465). For additional information, contact your DHI Sales Representative.
If the MFC-CB will be used with an optional DHI MFC Switchbox, consider placement of the
Switchbox and the connection and disconnection of MFC cables (see Section 3.4.6, Figure 5).
2.3 INITIAL SETUP
2.3.1 PREPARING FOR OPERATION
No special preparation of MFC-CB is required prior to putting it into operation.
Connect the power cord supplied to the MFC-CB and to a power source.
2.3.2 MFC-CB TO MFC OR MFM CONNECTION
Prepare an MFC-CB to MFC or MFM cable using one of the kits provided with the MFC-CB
(see Section 7.2 for information on cable pin out) or an optional preassembled cable if you
have one.
Connect the MFC-CB to MFC/MFM cable to the DEV1 or DEV2 25 pin DSUB connection on
the MFC-CB rear panel.
If you are using an optional MFC Switchbox, connect the Switchbox to the DEV1 or DEV2
MFC-CB rear panel connection and then connect the MFC or MFM to the MFC Switchbox (see
the MFC Switchbox User’s Manual and Section 3.4.6, Figure 5).
2.4 POWER UP AND VERIFICATION
2.4.1 POWER UP
Turn ON the MFC-CB rear panel main power switch. Observe the front panel display as
MFC-CB initializes, error checks and goes to the MAIN run screen (see Section 3.1.1).
The front panel ON/OFF key controls a SOFT ON/OFF (see Section 3.1.2.3). This allows
MFC-CB’s front panel to be turned off while maintaining the power supply to devices that are
connected to it.
If the MFC-CB fails to reach the MAIN run screen, service may be required. Record the
sequence of operations and displays observed and contact a DHI Authorized Service Provider.

2. INSTALLATION
Page 9©2001~2007 DH Instruments, a Fluke Company
2.4.2 CHECK/SET SECURITY LEVEL
MFC-CB has a security system based on user levels. By default, the security system is set to
“low”, which includes certain access restrictions, and there is no password required to change
the security level. See Section 3.4.2 and Table 4 for information on the security level system.
As part of the MFC-CB startup, set your desired security level and a password.
MFC-CB is delivered with the security level set to low to avoid inadvertent altering of critical
internal settings but with access to changing security levels unrestricted. It is recommended
that the low security level be maintained at all times and password protection be
implemented if control over setting of security levels is desired.

MFC-CB™ Operation and Maintenance Manual
©2001~2007 DH Instruments, a Fluke Company Page 10
N
NO
OT TE ES S

3. OPERATION
©2001~2002 DH Instruments, Inc Page 11 .
3. OPERATION
3.1 GENERAL MANUAL OPERATION
MFC-CB is designed to offer the optimum balance between simple, intuitive operation and the
availability of a variety of functions with a high level of operator discretion. The local operator
interface is through the front panel’s 2 x 20 character alpha-numeric display and a 4 x 4
multi-function keypad.
3.1.1 MAIN RUN SCREEN
The MFC-CB MAIN run screen is its home display that is reached on power up and from
which other functions and menus are accessed. It is the top level of all menu structures.
The MAIN run screen is where the MFC-CB is left in normal operation. It displays the set
point output, if applicable, and the measurement from the MFC or MFM as well as a variety of
additional information if desired.
1. <→>Active channel indication in DEV1&2
DISPLAY mode (see Section 3.2.4.1). Blank if not
in DEV1&2 DISPLAY mode.
2. <SSSSSS>: Numerical value and sign of the set
point (see Section 3.2.8).
3. <a>: Indicates whether a user adjustment is being applied to the set point (see Section 3.3.5).
<a> if an adjustment is being applied, blank if no adjustment is being applied.
4. <UNIT>: Unit of measure of the set point and measurement numerical values (see Section 3.2.2).
5. <K>: Indicates whether a gas correction factor (K factor) is being applied (see Section 3.2.1).
<K> if a factor is being applied, blank if no factor is being applied.
6. <a>: Indicates whether a user adjustment is being applied to the measurement value (see
Section 3.3.5). <a> if an adjustment is being applied, blank if no adjustment is being applied.
7. <MMMMMM>: Numerical value of the measurement from the MFC or MFM.
8. <Dn,c>: Indicates which device channel is being displayed on the top line of the display. <n> is
<1> for DEV1, <2> for DEV2. <c> indicates the current channel of the MFC Switchbox if a
Switchbox is connected to DEVn, blank if no Switchbox is in use (see Section 3.4.6).
9. <DISPLAY MODE DATA>: Information displayed depends on current DISPLAY mode (see
Section 3.2.4).
2
3
9
10 8
SSSSSSaUNITKaMMMMMM→
D DISPLAY MODE Dn,c

MFC-CB™ Operation and Maintenance Manual
©2001~2007 DH Instruments, a Fluke Company Page 12
10. <D>: Indication of what is being displayed on the bottom line of the display as set by the DISPLAY
function (see Section 3.2.4). Possible indications include:
•<→>: Current DISPLAY mode is DEV1&DEV2 (see Section 3.2.4.1) and the active device
channel is DEV2. The arrow is on the first line if the active device channel is DEV1.
•<Σ> and far right of bottom line is Dn + Dn: Current DISPLAY mode is SUM (see
Section 3.2.4.2).
•<Δ>and far right of bottom line is Dn - Dn: Current DISPLAY mode is DIF (see
Section 3.2.4.3).
•<blank> and far right of bottom line is Dn/Dn: Current DISPLAY mode is RATIO (see
Section 3.2.4.4).
•Blank, and no characters other than Dn on bottom line: Current DISPLAY mode is CLEAN
(see Section 3.2.4.5).
When a number is too large to show in the allocated display space, MFC-CB
displays <********>.
MFC-CB has a SCREEN SAVER function that causes the display to dim if no key is pressed for
10 minutes. Pressing a key restores full power to the display. The screen saver activation
time can be changed or screen saving can be completely suppressed (see Section 3.4.3.1).
3.1.2 GENERAL OPERATING PRINCIPLES
3.1.2.1 KEYPAD LAYOUT AND PROTOCOL
MFC-CB has a 4 x 4 keypad for local operator access to direct functions, function
menus and for data entry.
1. The Editing and Execution keys are for
execution, suspending execution,
backing up in menus and editing entries.
2. The Menu/Data keys provide access to
function menus from the MAIN run
screen. The menu name is on the
bottom half of the key. The SETUP
menu is for more frequently used
functions. The SPECIAL menu is for
functions that are not generally used as
a part of day to day operation. These keys
enter numerical values when editing.
3. The Function/Data keys allow very
commonly used functions to be
accessed directly from the MAIN run
screen by a single keystroke. The name
of the function is on the bottom half of
the key (see Section 3.1.2.5). These keys
enter numerical values when editing.
Figure 4. MFC-CB Keypad Layout
1
3
2