Frequency Devices 9002 User manual

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Model 9002
September 1999

Dual-Channel Programmable Filter Instrument
OPERATOR MANUAL -Certified

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Model 9002

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Section . . . . . . . . . . . . . . . . . . . . . . . . . . .Page
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Warranty & Repair . . . . . . . . . . . . . . . . . . . . . .2
Section 1 - Introduction
1.1 Device Description . . . . . . . . . . . . . . . . . . . . .3
1.2 Applications . . . . . . . . . . . . . . . . . . . . . . . . . .3
1.3 System Interconnection . . . . . . . . . . . . . . . . . .3
Section 2 - Instrument Description
2.1 Front and Rear Panel Controls . . . . . . . . . . . .5
2.2 Input/Output Characteristics . . . . . . . . . . . . . .5
2.3 Filter Properties . . . . . . . . . . . . . . . . . . . . . . . .6
2.4 Specifications . . . . . . . . . . . . . . . . . . . . . . . . .7
2.4.1 Electrical . . . . . . . . . . . . . . . . . . . . . . .7
2.4.2 Physical . . . . . . . . . . . . . . . . . . . . . . . .8
2.4.3 Environmental . . . . . . . . . . . . . . . . . . .8
Section 3 - Installation and Setup
3.1 Unpacking and Inspection . . . . . . . . . . . . . . . .9
3.2 Packaging for Shipment . . . . . . . . . . . . . . . . .9
3.3 Environmental Requirements . . . . . . . . . . . . .10
3.4 Line Voltage . . . . . . . . . . . . . . . . . . . . . . . . .10
3.4.1 System Grounds . . . . . . . . . . . . . . . .12
3.5 Basic Setup . . . . . . . . . . . . . . . . . . . . . . . . . .12
Section 4 - Operation from the Front Panel
4.1 Front Panel Description . . . . . . . . . . . . . . . . .13
4.2 Indicator LED’s . . . . . . . . . . . . . . . . . . . . . . .13
4.3 Function Keys . . . . . . . . . . . . . . . . . . . . . . . .13
4.3.1 Details of the Function Keys . . . . . . . .14
Model 9002
Table of Contents
Section . . . . . . . . . . . . . . . . . . . . . . . . . . .Page
Section 5 - Remote Control Operation
5.1 The Control Method . . . . . . . . . . . . . . . . . . . .19
5.2 Programming Rules . . . . . . . . . . . . . . . . . . . .19
5.2.1 Listen/Talk Structure . . . . . . . . . . . . . .20
5.3 Key-Push Commands . . . . . . . . . . . . . . . . . .20
5.4 Special Command Codes . . . . . . . . . . . . . . .21
5.4.1 Use of Special Code $05,
Abort to Local . . . . . . . . . . . . . . . . . .21
5.4.2 Use of Special Code $06, Set Filter . .22
5.4.2.1 The Code $06 Command Setup . . . . .22
5.4.2.2 Calculating Program Parameters . . . .23
5.4.2.3 Example of a Code $06
Command Setup . . . . . . . . . . . . . . . .26
5.4.3 Code $0B - Go to Channel N,
Filter M . . . . . . . . . . . . . . . . . . . . . . .29
5.4.4 Code $0C - Send Back Channel
Status . . . . . . . . . . . . . . . . . . . . . . . .30
5.4.5 Code $0D - Send Back Channel
Definition . . . . . . . . . . . . . . . . . . . . . .31
5.4.6 Code $0E - Send Back Clip Status . . .32
5.4.7 Code $0F - Go to Remote Control . . .33
5.5 Example of a Remote Control Program . . . . .33
Appendix A - Product Data a Sheet
Appendix B - Binary/Decimal/Hex Review
B-1 Decimal to Binary . . . . . . . . . . . . . . . . . . . . .35
B-2 Binary to Hex . . . . . . . . . . . . . . . . . . . . . . . .36
B-3 Decimal to Hex . . . . . . . . . . . . . . . . . . . . . . .37
Appendix C - Remote Control Programs
C-1 Program 1 . . . . . . . . . . . . . . . . . . . . . . . . . . .38
C-2 Program 2 . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Table of Contents

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Model 9002
Figures and Table
List of Figures
Figure . . . . . . . . . . . . . . . . . . . . . . . . . . .Page
1.1 Model 9002 in a Typical Setup . . . . . . . . . . . . .4
2.1a Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2.1b Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2.2 IEEE Connector Identification . . . . . . . . . . . . .6
3.1 Changing the Line Voltage . . . . . . . . . . . . . . .10
4.1 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . .14
List of Tables
Table . . . . . . . . . . . . . . . . . . . . . . . . . . .Page
2.1 Electrical Characteristics of Filters . . . . . . . . . .7
4.1 Explanation of LED indicators . . . . . . . . . . . .13
4.2 Explanation of Function Keys . . . . . . . . . . . .13
4.3 Filter Type and Characteristics . . . . . . . . . . .15
4.4 Frequency Ranges and Increments . . . . . . . .17
5.1 Codes for Function Keys . . . . . . . . . . . . . . . .20
5.2 Codes for Numeric Keypad . . . . . . . . . . . . . .21
5.3 Special Codes . . . . . . . . . . . . . . . . . . . . . . . .21
5.4 Parameters Programmed with Codes $06 . . .22
5.5 Filter Configuration Codes . . . . . . . . . . . . . . .22
5.6 The $06 Command Setup List . . . . . . . . . . . .23
5.7 Calculation of R . . . . . . . . . . . . . . . . . . . . . . .23
5.8 Range Selection Table . . . . . . . . . . . . . . . . . .24
5.9 Gain in Various Numerical Bases . . . . . . . . . .26
5.10 Development of Codes for the Sample
Configuration . . . . . . . . . . . . . . . . . . . . . . . . .28
5.11 Hex Codes of Filters . . . . . . . . . . . . . . . . . . .31
5.12 Channel Definition Data Sent Back . . . . . . . .32
5.13 Clip Status Definition Data Sent Back . . . . . .32
B.1 Binary to Hex Conversion . . . . . . . . . . . . . . .36
B.2 Conversion of 8-bit . . . . . . . . . . . . . . . . . . . .36
B.3 Decimal to Hex . . . . . . . . . . . . . . . . . . . . . . .37
Figures and Tables

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1
Model 9002
Preface
Preface
The Frequency Devices, Inc. Model 9002 is a Dual Channel, Programmable Lowpass or Highpass active, electronic
filter. It represents state-of-the art filter modeling, utility, flexibility and ease of programming, either from the front
panel or by a remote controller. Users can select from a total of four lowpass and two highpass filter models.
The system can be internally programmed for eight different filters in each channel. The unit operates over a wide
range of frequencies and provides the finest resolution for a given input frequency. Filter types for each channel are
specified at time of purchase. Remote operation of the Model 9002 is accomplished through a controller equipped
with an IEEE-488 interface.
This manual contains installation, operation, programming and troubleshooting information about the Model 9002.
Although operation of the Model 9002 is quite straightforward, you must read and understand the information in this
manual before applying power or connecting any components or external devices.
Warranty information is given on the following page, Improper use of the instrument may void the warranty, so
please use this manual as an instruction guide at all times.
We at Frequency Devices, Inc. are pleased that you have selected our product for your research and development
applications. Should you have any questions or problems, do not hesitate to contact your local Frequency Devices,
Inc. representative for prompt assistance.
Each section of this manual begins with a table of contents and a brief discussion. This will help you access the
information you need as quickly as possible. The instruction and associated information for the Model 9002 are
presented as follows:
Section 1 - Introduction
Contains general descriptive information about the Models 9002, including applications information.
Section 2 - Description
Provides physical and technical specifications and control details.
Section 3 - Installation
Provides step-by-step instructions for unpacking, installation and setup.
Section 4 - Front Panel Operations
Item-by-item presentation of local operation from the front panel.
Section 5 - Remote Control Operations
System programming and operating via a remote controller.
Appendices
The Appendices provide you with additional technical and reference information for advanced operations, as well as
examples of remote operation programs.

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2
Model 9002
Warranty & Repair
Warranty
The Model 9002 Instrument is warranted against defects in material and workmanship for a period of one (1) year
from the date of shipment. During the warranty period, Frequency Devices Inc. will, at its option, repair or replace
products that prove to be defective.
For warranty service or repair, all products must be returned to Frequency Devices Inc. after obtaining a return
authorization (RA) number from the factory. Frequency Devices Inc. will pay the shipping charges from and to the
Buyer, except for products returned to FDI from another country. In this case the Buyer shall be responsible for all
shipping charges, duties, and taxes.
Limited Warranty
This warranty shall not apply to defects that are the results of improper use, unauthorized modification or repair, or
improper installation or maintenance.
No other warranty is expressed or implied. Frequency Devices, Inc. specifically disclaims the implied warranties of
merchantability and fitness for a particular purpose.
The remedies provided herein are the Buyer’s sole and exclusive remedies. Frequency Devices Inc. shall not be
liable for any direct, indirect, special, incidental, or consequential damages, whether based on contract, tort, or any
other legal theory.
Certification
Frequency Devices Inc. certifies that this product met its published specification at the time of shipment from the
factory. Frequency Devices, Inc. further certifies that its calibration measurements are traceable to the United States
national Bureau of Standards, to the extent allowed by the bureau’s calibration facility, and to the calibration facilities
of other International Standards Organization member.
Repair
Frequency Devices, Inc. maintains a repair facility at its factory in Haverhill, Massachusetts which is available for
both in-warranty and non-warranty repair. We suggest that you contact your local FDI representative before taking
steps to return equipment for repair.
Return Authorization
All products being returned to Frequency Devices, Inc. must have a Return Authorization (RA) number. This number
may be obtained by calling Frequency Devices, Inc. before returning the product.
The RA number should be clearly displayed on the outside of the package being returned and should be placed on
all correspondence concerning the instrument.
Frequency Devices, Inc. may refuse to accept shipment and will not be responsible for shipping charges of product
returned without an RA number.

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Section 1
3
Model 9002
Introduction
Section 1
Introduction
1.1 - Device Description
This system is intended for use as an electronic filter for applications in the Hertz to hundred of kiloHertz range. It can
exhibit either highpass or lowpass characteristics and simulates any two of six possible mathematical configurations:
The filter type in each channel is selected at time of purchase and is installed at the factory. If changing of the filter
type is desired, contact your local FDI representative.
The two channels in the unit are entirely independent. They can by externally interconnected to create a bandpass
filter with adjustable upper and lower cutoff points. The unit is voltage protected at the input up to 100 V and current
limited at the output to 100 mA.
Each channel can be programmed to eight separate configurations, becoming eight distinct filters. The programming
can be done at the front panel or via an IEEE-488 interface to a remote controller. The configurations are stored in
nonvolatile memory for recall or change at any time.
1.2 - Applications
The Model 9002 filter can be used in any application where frequency filtration is required. A wide range of frequen-
cies, input voltage ranges, and pre- and post-amplification stages enables these filters to interconnect with most
laboratory equipment as well as standard audio and radio frequency test equipment. Since the filter characteristics
can be precisely defined, the Model 9002 is an excellent development instrument for perfecting filter spectra in
analytic, electronic, biomedical, and physics applications.
1.3 - System Interconnection
The Model 9002 may be considered to be two, independent electronic frequency filters with either highpass or
lowpass properties. The channels may be cascaded to produce a bandpass filter. Use of the filter is the same as
any R-L-C filter network, with the following exceptions:
1. Your signal source is not loaded by the filter.
2. The output has a fixed, 50 ohm resistive impedance.
3. Signal levels can be controlled at the input and output by means of built-in
variable gain operational amplifiers.
Lowpass: Butterworth, Elliptic, Bessel, Constant Delay
Highpass: Butterworth, Elliptic

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Section 1
4
Connection of the filter with your system is straightforward; a typical setup is shown in Figure 1.1, below.
Figure 1.1 Model 9002 in a Typical Setup
When operating the filter with a remote controller, care must be taken to follow the programming rules presented in
Section 5 of this manual. In the remote mode, the unit looks at the IEEE-488 bus for its operating commands.
Control of the filters is switched to and from the front panel by depressing a single function key on the panel or by
the appropriate controller commands.
Model 9002
Introduction
Remote Controller
PC< >488
Rear Panel
FDI
Model 9002
Front Panel
Input Output
Signal
Conditioner
Signal
Conditioner
Digitizer
Digitizer
Sensor 1
Sensor 2 Data Out 2
Data Out 1
11
2
2
IEEE-488

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Section 2
5
Model 9002
Instrument Description
Section 2
Instrument Description
2.1 - Front and Rear Panel Controls
Control and system I/O is accomplished on the front panel of the system. In the remote mode, control is transferred
to an interconnected controller. Figures 2.1a and 2.1b show the front and rear panels, respectively.
Upper Figure 2.1a Front Panel Lower Figure 2.1b Rear Panel
2.2 - Input/Output Characteristics
The Model 9002 is contained in a single electronic chassis and is designed to interface directly with a remote
controller fitted with an IEEE-488 interface card. Connection to the controller is via an IEEE connector on the rear
panel as shown in Figure 2.1b. A standard IEEE connector with appropriate callouts is shown in Figure 2.2.

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Section 2
6
Figure 2.2 IEEE Connector Identification
The signals to be filtered are introduced to the Model 9002 via front and rear panel coaxial BNC connectors as seen
in Figure 2.1a. Input impedance is one megohm resistive shunted by a fixed 47 picofarad capacitance. Signal inputs
can be up to 20 volts p-p without clipping.
The filtered outputs are also supplied a BNCs on the front and rear panels. The output amplifiers are protected by
current limiting resistors. Outputs take on the same AC or DC coupling as the inputs, though output signal levels can
be independently adjusted.
Inputs are operator programmable by either single-ended or differential input, and may be either AC or DC coupled.
The input is overload protected via diode clamping to the power supply.
Precise circuit configurations for both input and output are given in the Product Data Sheet (Appendix A).
2.3 - Filter Properties
The Model 9002 is configured with two standard filters that are specified at the time of ordering. These filters are
chosen from the six models available, ten lowpass and five highpass. Table 2.1 lists the filter models available:
Model 9002
Instrument Description
Pin Definition Pin Definition Pin Definition
1 D101 5 EOI 12 Shield-Chassis Ground
2 D102 17 REN 18 P/O Twisted Pair with Pin 6
3 D103 6 DAV 19 P/O Twisted Pair with Pin 7
4 D104 7 NRFD 20 P/O Twisted Pair with Pin 8
13 D105 8 NDAC 21 P/O Twisted Pair with Pin 9
14 D106 9 IFC 22 P/O Twisted Pair with Pin 10
15 D107 10 SRQ 23 P/O Twisted Pair with Pin 11
16 D108 11 ATN 24 Isolated Digital Ground

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Table 2.1 Electrical Characteristics of Filters
Each filter channel has eight programmable configurations which are stored in the system’s nonvolatile
memory. Any of the eight configurations may be modified and selected from the front panel or from the front panel or
from the remote controller.
Filters may be bypassed by use of a front panel control. This replaces the filter with a unity gain amplifier; all
other input and output setups of the configurations (gains, AC/DC, etc.) remain in the configuration path. Detailed
characteristics of the filters are contained in the Product Data Sheet (Appendix A).
2.4 - Specifications
2.4.1 - Electrical
Line Voltage 100,120,220, 240 VAC
Power consumption 200 watts
Number of Channels 2
Configurations per channel 8
Frequency Range Frequency Increment
0.1 Hz-102.4 Hz 0.1 Hz
103.0 Hz-1,024.0 Hz 1 Hz
1,030.0 Hz-10,240 Hz 10 Hz
10,300.0 Hz-102,400 Hz 100 Hz1
Pre-gain and Post-gain characteristics
Amplifiers are non-inverting
Gains are variable from 1x (0 db) to 13.75x (22.7 db)
Gain increments are in steps of 0.05x
Precision of gain ratios is ±.02x
Type Number Characteristic
Lowpass
LP00 8-pole Butterworth
LP01 8-pole, 6-zero elliptic 1.77
LP02 8-pole,Bessel
LP03 8-pole, 6-zero constant delay
LP05 8-pole, 6-zero elliptic (200 kHz)
LP06 4-pole Bessel
LP07 4-pole Butterworth
LP08 8-pole, Bessel (200 kHz)
LP09 8-pole, Butterworth (200 kHz)
LP10 8-pole, 6-zero constant delay (200 kHz)
Highpass
HP00 8-pole Butterworth
HP01 8-pole, 6-zero elliptic1.77
HP05 8-pole, 6-zero elliptic (200 kHz)
HP07 4-pole Butterworth
HP09 8-pole, Butterworth (200 kHz)
Model 9002
Instrument Description
Section 2

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Section 2
8
Input Impedance2
Single ended 1 M Ωpar. with 47 pF to analog grd.
Differential 1 M Ωpar. with 47 pF to analog grd. on each side
Input Signal Level
± 10V peak for linear system operation
Protected to withstand 115 volts AC at input without damage
Common Mode Rejection
60 db typical, 50 db minimum, DC to 100 kHz
Common Mode Voltage range Full signal swing (±-10V)
Output Characteristics
Impedance 50 ohms, resistive2
Current maximum ±100 mA into a 50 ohm load
Offset Voltage ±2 mV, for 0 db Pre- and Post-gain
Filter Bypass mode
System maintains all characteristics of the chosen filter except the passband is flat with a
small signal bandwidth of 1 mHz (-6 db) and full power bandwidth of 125 kHz.
2.4.2 - Physical
Height 3.5 in; 90 mm
Width 8.5 in; 216 mm
Depth 17 in; 432 mm
Mounting Benchtop or 19 inch rack mount
2.4.3 - Environmental
Operating Temperatures
Full specifications and resolution 20 to 30° C; 68 to 86° F
Reduced specifications 0 to +40° C; 32 to 104° F
Storage Temperature -25 to +55° C; -13 to +131° F
Relative Humidity 95% max., without condensation
Altitude Up to 15,000 feet; 4500 meters
110,400.0 Hz-204,800.0 Hz @ 200 Hz increments for 9002-200 kHz
2See the Product Data Sheet (Appendix A) for circuit details.
Model 9002
Instrument Description

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Section 3
9
Model 9002
Installation and Setup
Section 3
Installation and Setup
3.1 - Unpacking and Inspection
When Model 9002 is received, inspect the cartons for visible external damage. If there is obvious physical damage,
we suggest that the carrier’s agent be present during unpacking. Do not destroy the shipment container during
opening so that it may be used for future shipment of the device.
After removing the Model 9002 from the shipping container, examine it for obvious physical damage such as dents,
dislodged components or damaged connectors. If a component is damaged, notify the carrier and follow the instruc-
tions for damage claims.
Warning
DO NOT APPLY POWER TO DAMAGED COMPONENTS. INJURY OR FURTHER
COMPONENT DAMAGE MAY OCCUR.
Inform your Frequency Devices, Inc. representative immediately with specific details about the actual extent of the
damage. Your representative will assist in arranging for repair or replacement of the instrument.
3.2 - Packaging for Shipment
Keep the original shipping cartons. Frequency Devices, Inc. will not accept responsibility for damages in shipment
nor shipping costs if the unit is returned to FDI in an unapproved carton.
Before returning a unit to FDI, you must obtain a Return Authorization (RA) number from FDI.
To pack the Model 9002 for shipment:
1. Tape a tag or letter to the unit identifying the owner and the service or repair to be made.
Include the following information:
RA number
Model number
Serial numbers on the instrument
In any correspondence with us, identify the unit by these numbers.
2. Place the unit in the original carton or request a replacement carton from Frequency
Devices, Inc. (no charge for units in warranty).
3. Secure the carton with strong tape.
4. For international shipments, or if an alternate shipping carton must be used, do the following:

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Section 3
10
Wrap the unit in heavy plastic and place packing material around all sides of the instrument in a strong
carton. Protect the front panel with extra cardboard strips. Seal the carton with strong tape.
5. Mark the shipping carton: DELICATE ELECTRONIC INSTRUMENT. FRAGILE.
3.3 - Environmental Requirements
The Model 9002 operates as either a benchtop or rack mounted unit. When setting up the Model 9002, be sure it
has sufficient space for proper ventilation. Ambient temperature and humidity should not exceed the values given in
the specifications of Section 2.4.3.
3.4 - Line Voltage Selection
The unit can be set up to operate on 100, 120, 220 or 240 Volts AC, at 50 or 60 Hz. Units are shipped for 120 Volt
operation unless otherwise specified at the time of purchase.
The system is delivered with a power line cord appropriate to the ordered voltage configuration. If you have received
the improper line cord for your area, please contact your local FDI representative for assistance.
Caution
MAKE SURE THE REAR PANEL POWER INPUT CONNECTOR IS IN THE CORRECT POSITION AND THE
CORRECT FUSE IS INSTALLED BEFORE APPLYING AC POWER.
See Figure 3.1
Model 9002
Installation and Setup

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Section 3
11
Model 9002
Installation and Setup
Reconfiguration of the system for a different voltage is accomplished as follows:
Figure 3.1 Changing the Line Voltage
Reverse this procedure to reassemble the voltage connector.
D. Grasp the voltage board, being careful no to
damage plated pads. E. Remove the board by pulling straight out.
F. Select voltage by rotating the board until the desired voltage is oriented at the top left side of the board.
A. Remove the power cord. B. Slide the plastic door to the left.
C. Pull the fuse lever out and to the left; remove the fuse.

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Section 3
12
3.4.1 - System Grounds
The Model 9002 grounding system has been designed to allow maximum flexibility and noise immunity. There are
three electrically isolated grounds brought out for connection to the external components.
Digital ground for connection to the remote controller is provided on the IEEE-488 interface connector.
Analog signal ground is brought out through a rear panel plastic banana plug and is internally connected to the unit’s
analog power supply. Analog ground provides a system ground reference for differential input configurations.
Effective grounding of signal lines and every chassis will greatly improve noise immunity and assure precise filter
spectra. A discussion of noise and distortion that accompanies the Model 9002 filter process is found in the Product
Data Sheet (Appendix A).
3.5 - Basic Setup
The Model 9002 may now be connected to the power source, to the remote controller (if remote is being used), and
to the circuit to be filtered.
1.Connect the device being filtered to the input and output BNCs on the front or rear panel. Be sure that both input
and output are hooked up to the same channel. If possible, connect a ground strap between the chassis of the
device and the Model 9002 chassis.
2.For remote operation, connect the IEEE-488 interface from the remote controller to the connector provided on the
rear panel of the Model 9002. If the controller is not already equipped with an IEEE-488 interface card, one must
be installed. Refer to the computer or controller manufacturer’s instructions for card installation.
3.Plug the unit into the power source.
4.You are now ready to learn and utilize the many features of your Model 9002 Dual Channel Programmable Filter.
The following sections contain specific control, modification, and programming information. Please read these
sections carefully before using the system.
Model 9002
Installation and Setup

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Section 4
13
Model 9002
Operation from the Front Panel
Section 4
Operation from the Front Panel
4.1 - Front Panel Description
In local operation the Model 9002 can be completely operated from the front panel. Remote control requires the writ-
ing of programs using codes and commands that are described in Section 5. The panel indicators and controls can
be grouped into five categories:
Indicator LEDs 16 LEDs
Numeric keypad 0-9 plus associated keys
Function keys 10 keys
Input and Output connectors 1 input & 1 output per channel
Alphanumeric display 3-1/2 digits
4.2 - Indicator LEDs
Table 4.1 gives the name and active function of the 16 LEDs on the front panel.
Table 4.1 Explanation of LED Indicators
4.3 - Function Keys
There are 10 function keys for programming and reviewing the setup of the Model 9002. These are used in the
process of setting up a channel in any of the eight programmable filter configurations, and in checking the status of
the filter during use.
Most keys are inactivated when the control of the system is transferred to a remote controller. Table 4.2 and the
discussion in the following section include the key functions and the situations in which they are active or inactive.
Indicator Label Model 9002 Active Function
SNG Configured for single-ended Input
DIF Configured for differential Input
AC AC Input/Output Coupling
DC DC Input/Output Coupling
BYP Filter Bypass mode is selected
MEM Displays present filter config.#
REM Remote control operation is selected
CH1 Channel 1 selected for display
CH2 Channel 2 selected for display
PRE Pre-filter gain is displayed
POST Post-filter gain is displayed
KHZ Frequency is displayed, kHz Scale
HZ Frequency is displayed, Hz Scale
GAIN Value of Pre- or Post-gain is displayed
CLIP 1 Channel 1 input is being clipped
CLIP 2 Channel 2 input is being clipped

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Table 4.2 Explanation of Function Keys
The numerical keypad and the function keys ENT, ⇑, and ⇓, allow control of frequency, gain, filter configuration
number, and remote IEEE address. The following are detailed instructions for using the functions keys and corre-
sponding LEDs. Refer to Figure 4.1 for front panel location.
4.3.1 - Details of the function keys
Selection of particular function keys or selection of remote control from the controller (REM CTL) will deactivate
certain keys. In the following description, the function key labels are shown in boxes on the left; the bracketed keys
on the right are the active or inactive keys.
Figure 4.1 Front Panel
Model 9002
Operation from the Front Panel
Key Label Affect on Model 9002 Operation
CH1/CH2 Toggle: Programming and display between
Ch. 1 & Ch. 2
FLTR MEM Selects Filter Number (0-7) in both channels
FLTR TYPE Display Filter Type for the active channel
REM CTL Toggle: Remote or Local control
FREQ/GAIN 3-position Toggle: Freq., Pre-gain, or Post-gain
SNG/DIF Toggle: Single-ended or Differential input
ACT/BYP Toggle: Filter in-circuit or Bypassed
AC/DC Toggle AC or DC I/O Coupling
HZ/KHZ Toggle: HZ or KHZ for frequency multiplier
for programming and display
CLR DSP Clears the LED Display

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Model 9002
Operation from the Front Panel
[all active keys]
This functions key switches programming and display between Channel 1 and Channel 2. The selected channel is
shown by illumination of the CH 1 and CH 2 indicator. CH1/CH2 does not change the configuration of a filter; it only
shows the present configuration for the selected channel.
[active keys: keypad, ENT, ⇑/⇓, CH1/CH2, CLR DSP FLTR MEM]
This key displays the present filter configuration number 0-7. The MEM indicator light will turn on. A configuration
contains the following combination of user-programmable filter parameter.
Pre- and Post-gain levels
Corner Frequency
Single-ended or Differential input
Filter in-circuit or Bypassed
AC or DC I/O Coupling
The filter configuration number can be changed in the range 0-7 on the numeric keypad or by using the ⇑/⇓keys. The
Model 9002 will not allow any number over 7 to be entered. The configuration number affects both Channel 1 and Channel
2. The CH1/CH2 key is used to display the configuration number in the selected channel. Thus, Channel 1 cannot be set
to configuration number 0, and Channel 2 simultaneously set to configuration number 5. They will automatically be set to
the same configuration number, although the setup of each configuration may be different for each channel.
Pressing FLTR MEM a second time will return the system to the previous control mode and update the instrument to
the presently selected configuration.
[active keys: CH1/CH2, FLTR TYPE]
Activation of this function causes the display of an alphanumeric, coded description of the type of filter in the selected
channel. The types are selected from those in Table 4.3. The CH1/CH2 key may be used to display the filter type in
the selected channel.
Table 4.3 Electrical Characteristics of Filters
FLTR
MEM
CH1
CH2
FLTR
TYPE
Type Number Characteristic
Lowpass
LP00 8-pole Butterworth
LP01 8-pole, 6-zero elliptic 1.77
LP02 8-pole,Bessel
LP03 8-pole, 6-zero constant delay
LP05 8-pole, 6-zero elliptic (200 kHz)
LP06 4-pole Bessel
LP07 4-pole Butterworth
LP08 8-pole, Bessel (200 kHz)
LP09 8-pole, Butterworth (200 kHz)
LP10 8-pole, 6-zero constant delay (200 kHz)
Highpass
HP00 8-pole Butterworth
HP01 8-pole, 6-zero elliptic1.77
HP05 8-pole, 6-zero elliptic (200 kHz)
HP07 4-pole Butterworth
HP09 8-pole, Butterworth (200 kHz)

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Pressing FLTR TYPE a second time will return the system to the previous mode.
[active keys: ⇑/⇓, CH1/CH2, FLTR TYPE, ENT, FLTR MEM, REM CTL,]
This function key allows the user to place the Model 9002 under the operation of the remote controller and displays
the presently assigned address of the instrument. The address can be changed using the ⇑/⇓keys. Only addresses
0-31 are valid. After entering the address, press the ENT key to transfer control to the remote controller. This will
light the REM indicator.
Once the system is under remote control, the only active key is REM CTL. Depressing this key a second time at any
stage of this procedure will return control of the Model 9002 to the front panel.
[inactive key: HZ/KHZ]
This key steps the display through the three filter parameter states while turning on the appropriate LED indicator.
The steps in sequence are:
Pre-filter gain
Post-filter gain
Filter Frequency
[inactive key: HZ/KHZ]
The method for changing gain is the same for both Pre- and Post-gain.
The PRE and GAIN LEDs will be lighted. The display will show the Pre-gain setup for the presently selected channel
and filter configuration number.
The gain has a range from 1.00-13.75 in incremental steps of 0.05. The numeric keypad or ⇑/⇓ keys are used to
change the gain. The suggested method for gain change is as follows:
Enter the gain value on the keypad
Press ENT to store the data
The ⇑/⇓keys store the gain on-line and the ENT key need not be pressed. These keys will increase or decrease
gain by one increment, that is, 0.05. Gain will change as long as the key is depressed. The value displayed will auto-
matically be stored in the present filter configuration number and selected channel. Pressing CH1/CH2 will display
the Pre-gain of the selected channel.
Pressing the FREQ/GAIN key a second time will put the unit in the filter Post-gain setup.
[inactive key: HZ/KHZ]
The POST and GAIN LEDs will be lighted. The display shows the Post-filter gain of the selected channel and filter
configuration number. Post-gain operation is the same as Pre-gain operation and CH1/CH2 will display the Post-gain
of the selected channel.
Pressing FREQ/GAIN a third time will place the system in the filter-frequency setup.
Model 9002
Operation from the Front Panel
REM
CTL
FREQ
GAIN
PRE-GAIN
POST-GAIN