Wavetek 2500 User manual

_SIGNAL GEhJERATOR
MODEL 2500
OPERA]]N~NUAL
THIS DOCUMENT CON"iAINS IN~ORMA"iION PRC-
PRIETARY
TO WAVETEK AND IS PROVIDED SOLEL. Y FOR
INSTRUMENi OPERATION AND MAINTENANCE. THE
INFORMATION IN THIS DOCUMENT MAY NOI BE
DUPLICATED
IN ANY MANNER WITHOUT THE PRIOi1
APPROVAL IN WRITING FROM WAVETEK.
: Yv'AVETEK
·REV .. E

USE OF THIS MANUAL
The documentation package for the Wavetek Model
of an Operating Manual and a Service Manual.
contains seven sections.
2500 RF Signal Generator consists
This is the Operating Manual. It
Section 1
Section 2
Section 3
section J;
section 5
Section 6
Section 7
Provides general information about the unit, including specifications.
Contains detailed installation instructions. Instructions proceed from
the initial inspection (after unpacking a unit) to the instrument
checkout procedure after installation is completed.
Provides operating instructions for the unit.
Contains the performance tests used to· verify that all functions of
the unit work properly.
Contains the maintenance instructions for the unit, including the
calibration procedure.
Contains GPIB documentation.
Contains any changes that must be made to this manual. Changes may
occur for various reasons. Wavetek's product improvement program
incorporates the most current technology into these instruments as
rapidly as development and testing will permit. Due to the time
required to document and print Operating/Service manuals it is not
always possible to include information about product improvements in
the original printing for a manual. Engineering updates to address
these changes occur in Section 7.
The Service Manual is an optional item. It contains Theory of Operation, Trouble-
shooting Notes, Reference drawings (schematics and assembly), and Replaceable Parts
Lists. Schematics and their associated assembly drawings are grouped together.
Please note that each of the figures in this text has a ten digit identification
number (xxxx-xx-xxxx). For example, the Wavetek identification number for Figure
2-1 is 0012-00-0176. These numbers are for internal use by Wavetek only.

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CONTEl.'TS
SECTION
1 -
GENERAL INFORMATION
1.1
INTRODUCTION
1.2
SPECIFICATIONS
SECTION 2 -
INSTALLATION
INSTRUCTIONS
2.1
INTRODUCTION
2.2
INITIAL INSPECTION
2.3
MECHANICAL INSTALLATION
2.04
ELECTRICAL INSTALLATION
2.5
INSTALLATION CHECKS
SECTION 3 - OPERATING INSTRUCTIONS
3.1 INTRODUCTION
3.2 AIR FILTER CAUTION
3.3 FRONT PANEL DESCRIPTION
3.04 REAR PANEL DESCRIPTION
3.5 LOCAL MODE OF OPERATION
3.5.1 TURN ON
3.5.2 NUMERIC ENTRIES (KEYBOARD AND SPIN KNOB)
3.5.3 NUMERIC ENTRY (KEYBOARD ONLY)
3.5.04 NON-NUMERIC ENTRY
3.5.5 SETTING RF OUTPUT CHARACTERISTICS
3.5.5.1 FREQUENCY
3.5.5.2 POWER LEVEL
3.5.5.3 MODULATION
3.5.6 STORAGE/RECALL OF FRONT PANEL SETTINGS
3.5.7 RETURN TO LOCAL MODE OF OPERATION FROM REMOTE (GPIB)
3.6 OPERATOR ERROR MESSAGES
3.6.1 UNLOCKED
3.6.2 TRIPPED
3.6.3 MODULATION DISPLAY BLINKS ON/OFF
3.7 CALIBRATION DUE INDICATORS
SECTION 4
04.1
04.2
04.3
04.4
4.5
04.6
4.7
4.8
4.9
3.7.1 UNLOCKED
3.7.2 UNLVD
- PERFORMANCE TESTS
INTRODUCTION
FREQUENCY RESOLUTION AND RANGE TEST
FREQUENCY ACCURACY TEST
HARMONICS TEST
NON-HARMONICS TEST
SUB-HARMONICS TEST
PHASE NOISE TEST
SWITCHING SPEED TEST
.AM PERFORMANCE TESTS (AM ACCURACY, DISTORTION, AND
BANDWIDTH)
i
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4.10
4.11
4.12
4.13
4.14
4.15
4.16
4.17
SECTION 5
5.1
5.2
RESIDUAL AM TEST
RESIDUAL PM TEST
CONTElITS (Con't)
FM PERFORMANCE TESTS (PM ACCURACY, DISTORTION, BANDWIDTH,
AND DEVIATION RANGE)
OUTPUT POWER LEVEL ACCURACY TEST
OUTPUT POWER LEVEL FLATNESS TEST
OUTPUT IMPEDANCE TEST
EXTERNAL REFERENCE TEST
SAMPLE PERFORMANCE TEST RECORD
- MAINTENANCE
INTRODUCTION
SERVICE INFORMATION
5.2.1 FAN/AIR FILTER MAINTENANCE
5.2.2 BOTTOM COVER REMOVAL
5.2.3 AIR FILTER CLEANING
5.3 AUTOCAL~ CALIBRATION
5.4 USER DIAGNOSTICS
5.5 POWER UP TEST
SECTION 6 - GPIB
6.1 INTRODUCTION
6.2 INSTALLATION INSTRUCTIONS
6.3 OPERATING INSTRUCTIONS
6.3.1 LOCAL/REMOTE MODE SELECTION
6.3.2 ADDRESS SETTING
6.3.3 GPIB INPUT COMMAND DEFINITION
6.3.4 GPIB INPUT COMMAND TYPES
6.3.5 PARAMETER COMMANDS
6.3.6 ENUMERATED COMMANDS
6.3.7 DIRECT COMMANDS
6.3.8 QUERY COMMANDS
6.3.9 SAMPLE SOFTWARE PROGRAMS
6.4 GPIB DATA EXCHANGE TEST
6.5 GPIB BOARD TEST (USER DIAGNOSTIC)
SECTION 7 - MANUAL CHANGES
7.1 INTRODUCTION
7.2 MANUAL CHANGES
ii
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Figure 2-1
Figure 3-1
Figure 3-2
Table 4-1
Table
6-1
Table
6-2
Table
6-3
Table
6-4
Table
6-5
Table
6-6
Table
6-7
Table
6-8
LIST OF FIGURES AND TABLES
AC Power Connector Module
Wavetek Model 2500 Front Panel
Wavetek Model 2500 Rear Panel
Recommended Test Equipment
Parameter Command Headers
Engineering Notation
Enumerated Command Listings
Enumerated Command Headers
Direct Command Headers
Query Command Headers/2500 Response
Header Formats for 10,
ERR,
and SET
Error Messages/Serial Poll Byte
iii
Query Commands
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1.1 INTRODUCTION
The Wavetek Model 2500 is a micro-
processor controlled, single-loop syn-
thesized signal generator that covers
the frequency range of 400 kHz to 1100
MHz. Standard features include a very
broad 1 MHz peak FM deviation, an
exclusive AutoCal® self-calibration
function, extensive user diagnostics,
an automatic power up test sequence,
and 15 non-volatile memory locations.
A 10 MHz square wave reference output
is available at the rear panel.
All operational controls are located
on the front panel. Controls include
keypad swi tches and a sp in knob for
entry of all RF output numeric parame-
ters. The spin knob provides entry that
has the ease and continuity and fine
tuning of analog control. Instrument
settings are indicated on three custom
LCD displays with electroluminescent
backlighting.
The 2500 is a space-saving 3/4-rack
size. (Two optional rack mount adaptor
kits are available.)
A talk/listen GPIB fully conforming to
the IEEE-488 standard is installed in
the Model 2500. Because it also con-
forms to proposed IEEE Standard 951,
the Model 2500 can be easily conformed
to any ATE system.
1.1.1 FREQUENCY CHARACTERISTICS
The carrier frequency may be set from
0.4 to 1100 MHz with a 10 Hz resolution
and .00005% (.5 ppm) accuracy.
1-1
SECTION 1
GENERAL INFORMATION
1.1.2 MODULATION CHARACTERISTICS
The instrument features both internal
and external AM and FM capabilities.
The internal modulation source may be
set at a 400 or 1000 Hz rate. AM depth
is specified from 0 to 99.9%. FM de-
viation can be set from 0 - 500 kHz
f
or carrier frequencies between 137.5
MHz and 275 MHz and from 0 to 1 MHz at
all other carrier frequencies. Reso-
lution is from 10 Hz to 1 kHz depending
upon the deviation set (see Section
1.2 for greater detail). The external
reference input may be a sine or
square wave at 1 MHz,S MHz, or 10 MHz.
Internal and external sources may be
used simultaneously to produce complex
modulation.
1.1.3 OUTPUT LEVEL CHARACTERISTICS
The Model 2500 has an RF output range
of +13 dBm to -137 dBm with an output
level flatness of ±1 dB. The level
resolution is .1 dB.
OUtput level may be read in dBm, mV,
or ~V. Reverse power protection to 50
watts is standard.
1.1.4 AutoCal®/DIAGNOSTICS
The Model 2500 utiliZes a unique Auto
Cal® routine to perform a quick and
easy almost completely automatic self-
calibration. A key is simply inserted
into the key-lock located on the rear
panel and at turn on the instrument
will present the operator with the
first in a series of menus to perform
the AutoCal® routine or any of the 19
user diagnostics supplied with the
unit.
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1.1.5 STORED SETTINGS
1.1.6 ERROR INDICATORS
Nonvolatile memory locations allow up
to 15 complete front panel settings to
be stored and recalled in any order.
This storage permits fast and accurate
recall of frequently used settings. The
parameters stored in location number 15
may be recalled with one keystroke.
The front panel displays for the 2500
indicate the following error condi-
tions:
An unlocked condition in the phase
locked loop circuitry
An unleveled condition in the RF
output leveler circuitry
The 2500 powers up with the same set-
tings present when power was removed,
except the RF output will be off.
A tripped RF circuit breaker
FM overmodulation
1.2 SPECIFICATIONS
1.2.1 FREQUENCY
Range (MHz)
Resolution
Frequency Stability/Temp
Frequency Stability (Aging)
switching Speed
1. 2 . 2 RF OUTPUT
Impedance
output Connector
Calibrated Level Range
Level Resolution
Level Accuracy
Flatness
Leakage
.4 - 1100
10 Hz
±0.5 ppm (±.00005~), 0-50
0 C
<1 ppm/yr.
Typically 200 mSec
50Q
Type "N"
+13 to -137 dBm
.1 dB
±1.3 dB for power levels >-36.9 dBm;
±(1.3 dB + .1 dB/IO dB step decrease) for power
levels <-36.9 dB
±1 dB
<1 ~V into a 2-turn 1 inch diameter loop at 1100
MHz
Conforms to MIL-STD-461, Class E, Sections CS01,
CS02, CS06, RE02, RS03 (to 1 GHz); VDE 0871,
Class B.
1-2
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1.2.3 SPECTRAL PURITY
Harmonics
Sub-Harmonics
(550 MHz - 1100 MHz)
Non-Harmonics (Spurs)
(>5 kHz from carrier)
1.2.4 PHASE NOISE @ 500 MHz
10 kHz offset
20 kHz offset
1.2.5 RESIDUAL AM
(.05 -15 kHz PDBW)
1.2.6 RESIDUAL FM
(.05 - 15 kHz PDBW)
(.3 - 3 kHz PDBW)
1.2.7 MODULATION
Modes
Internal Source
External Source
1.2.7.1 AM CHARACTERISTICS
AM Frequency Response
AM Resolution
AM Range
Modulation Accuracy, AM
(0 - 901..)
AM Distortion
<-30 dBc
<-25 dBc
<-50 dBc for carrier frequencies <137.5 MHz
<-60 dBc for carrier frequencies >137.5 MHz
<-107 dBc/Hz guaranteed (Typ -110 dBc/Hz)
Typ <-115 dBc/Hz
<-65 dBc
<30 Hz nus (.4 - 137.49999 MHz)
<15 Hz rms (137.5 - 274.99999 MHz)
<30 Hz rms (275 - 550 MHz)
<60 Hz
rms (>550
MHz)
<15 Hz rms typical
(.4 - 137.49999 MHz)
<10 Hz rms typical
(137.5 - 274.99999
MHz)
<15 Hz rms
typical
(275 - 550 MHz)
<30 Hz rms typical (>550 MHz)
AM, FH, COMPLEX (EXT
AM and INT
FM·
,
EXT
INT
AM)
FM
400
Hz, 1 kHz; derived from frequency standard
AM Mode:
DC
to 20 kHz, 600 Q floating input
FM
Mode: 20 Hz to 100 kHz, 600 Q floating input
DC to 15 kHz (Typ to 20 kHz), (3 dB bw, 501..
modulation)
.11..
and
o - 99.91.. (+3 dBm max output at 99.91.. modulation)
±11.. + (±51.. of indicated setting) at internal rates
<1.51.., below 301.. modulation
<31.., 30% to 701.. modulation
<51.., 701.. to 901.. modulation
1-3
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1.2.7.2 FM CHARACTERISTICS
FM Resolution
FM Rate
FM Deviation Range
for 1 kHz Rate
Modulation Accuracy, FM
FM Distortion
1.2.8 FRONT PANEL CONTROL
10 Hz (deviations <10 kHz)
100 Hz (deviations <100 kHz)
1 kHz
(deviations <1 MHz)
20 Hz - 100 kHz (3 dB bw)
1 MHz peak (3-137.49999 & >275 MHz)
500 kHz peak (137.5 -275 MHz)
100 kHz peak (1 -3 MHz)
10 kHz peak (.4 - 1 MHz)
At internal rates, ±S% of indicated setting,
excluding residual FM
<2% at internal rates for deviation <100 kHz
Type Push-buttons, Spin-Knob
1.2.9 REVERSE POWER PROTECTION
Max RF Power 50 W
Trip Level
- .7 W
Trip Time
Typically <1 mSec
Max DC Voltage
50 V
1.2.10 STORED SETTINGS
15 total, non-volatile; complete front panel settings stored
1.2.11 EXTERNAL REFERENCE INPUT (REAR PANEL)
Frequency
1, 5, or 10 MHz
Required Input Level/Impedance 1-5 Vp-p, into 50 Q
lNaveform
Sine or Square Wave
1.2.12 INTERNAL REFERENCE OUTPUT (REAR PANEL)
Frequency
10 MHz
Voltage Out/Impedance
100 mVp-p, into 50 Q
Waveform
Square Wave
1-4
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1.2.13 GENERAL
Dimensions
WoJeight
Power
1.2.14 REMOTE PROGRAMMING (GPIB)
Interface
Functions
14 em (5.5 in.) High; 31.8 em (12.5 in.) Wide;
53.3 em (21 in.) Deep
12.57 kg (27.7 lbs.) net; 14.38 kg (31.7 lbs.)
shipping
100 or 120, 220 or 240 VAC; 50-400 Hz
IEEE-488
Full Talk/Listen (Confonns to IEEE Proposed
Standard 951 for Codes and Fonnats)
1-5
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2.1 INTRODUCTION
This section provides complete instal-
lation instructions for the Wavetek
Model 2500 RF Signal Generator. These
instructions include the initial in-
spection required for the unit and con-
tain information on mechanical instal-
lation, electrical installation, and
the initial installation checks.
2.2 INITIAL INSPECTION
After unpacking the instrument, vis-
ually inspect external parts for damage
to connectors, surface areas, etc. The
shipping container and packing material
should be saved in case it is necessary
to reship the unit.
2.2.1 DAMAGE CLAIMS
If the instrument received has been
damaged in transit, notify the carrier
and either the nearest Wavetek area
representative or the factory in
Indiana. Retain the shipping carton
and packing material for the carrier's
inspection. The local representative
or the factory will immediately arrange
for either replacement or repair of
your instrument without waiting for
damage claim settlements.
2-1
SECTION 2
INSTALLATION INSTRUCTIONS
2.3 MECHANICAL INSTALLATION
2.3.1 Mechanical installation instruc-
tions are limited to those steps re-
quired to install the 2500 into a rack
using the optional rack mount adaptor
kits available from Wavetek.
2.3.2 Wavetek manufactures two rack
mount adaptor kits, one without slides
and one with slides. The rack mount
adaptor kit without slides (Wavetek
part number 1019-00-0278) provides a
fixed, immovable unit mount. The rack
mount adaptor kit with slides (Wavetek
part number 1019-00-0279) allows the
unit to be pulled out from the rack.
2.3.3 Complete installation instruc-
tions are supplied with the hardware
for either kit.
2.4 ELECTRICAL INSTALLATION
The instrument can operate from 100,
110, 220, or 240 VAC supply mains,
over an AC supply frequency range from
50 to 400 Hz. The rear-panel AC power
connector module selects which of
these operating voltages is being
used, and adjusts the Power Supplies
accordingly.
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~he A: powe" connecto" module connects
to an A: supply vi& & line cor~ with 2
3-pronb ylub' ~he module con~ains 2
time-delay line fuse: 1 1-. f 0" 100/::'20
VA: ope"atior.; 0.5 1-. f 0" 22012i10 VA:
operation. The fuse and a clearly
markec voltage selecto" are accessed
when the fuse/voltage select compart-
ment doo" is open (see Figure 2-::').
Instruments are shipped
factory set up for 120 VAC
unless otherwise specified.
VOLTAGE SELECTOR
from the
operation
FUSE AND FUSE CARRIER
00'2-00-0176
Figure 2-1. AC Powe" Connector Module
NOTE
Bef ore operating the
that the rear-panel
correct value for the
instrument, check
AC fuse is the
supply voltage.
2.5 INSTJ":'U.TrON CHE:KS
wavetek performs a rigorous and com-
plete test/calibration of each 2500
before it leaves the factory. Because
accidents can occur during shipment,
the user may elect to .perf orm any or
none of the following functional checks
to fu:-t.:~e=- ve:"'ify' p:-ope:" ope=-a~ior~. !t
is the user's responsibility to dete"-
rr,ine the degree to which the un:' t ""ill
be tes~e~ initially (upon receipt).
}~y time power is applied to the Model
250C,
sequence
automatically perforrr.s a test
to verify various subsystems
2-2
an:: sub~ysterr. circuitry is func:.ionc.l.
That. powe" u;; t.est. sequence :"5 oes-
c:-ioDec. irJ. Sec:.ion 5.5 0: this rr~nuc..~.
The follo" .. ing installation check pro-
cedures provide a quick functional test
to verify that the instrument (total
system) is operating properly. If the
user 6esires to verify operation at
specification limits, the performance
test procedures in Section '" of this
manual must be used.
The functional test procedures involve
use of the front panel controls and
displays. Controls and displays are
6escribed in 6etail in Section 3 of
this manual. Please read Section 3
before initiating operation.
AutoCal@, the almost completely auto-
matic self -calibratio!"; procedure for
the instrument, is con~ained in Section
5 cf this manual. If it. is determined
that t.he
prope:-ly, perform the
no:. opera~inb
Au ... oCal® proce-
oure, then retest..
2.5.1 REQUIRED TEST EQUIPME!~
The test. equipment required to perform
the following inst.allation checks will
ciepenc upon the degree to which the
user wants to verify the instrument.
If the desire is to verify to specifi-
cation, the use~ shoulc proceed to
Section ~ anc comple~e the perforrr.ance
~ests detailed the~e. The ins~alla~ion
checks desc:-ibec
in the
nex:.
fe ....
paragraphs are intendec ... 0 provide a
functiona.l test of the un:' t. The
operator "0':':'1 verify the output fre-
quency, modulation, ana power levels
are accura ... e to the limits of the tes~
equipment used and that the ou~put
characteristics change when programmed
to change. The f ollo ... ·ing tests a~e
general in nature because the opera~or
may use the test. equ:'?ment on hand
(spectrum analyzer,
zer, osc:'llosco?e,
to perf orm the:: ..
modulation analy-
power me~er, e~c.)
~avetek does not
recommenc specific tes~ equipment. to
use fo~ th~se initial functional ~ests.
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2.5.2 TURN ON
verify that the voltage selector is set
to select the available line voltage,
and that the proper fuse is installed
(see section 2.4). Verify that the
EXTERNAL/INTERNAL REFERENCE switch on
the rear panel is in the appropriate
posi tion (read section 3.4, item 3).
If the internal reference source is
used 1 this switch must be in the INT
position. (If this switch is not in
the INT position when the internal
reference is used, the power up self
test will give an error 18 message and
the unit will not operate. Read
sections 5.5 through 5.5.2 for greater
detail.) Depress the POWER switch. The
displays will indicate operation. The
LEVEL display will indicate RF OFF.
Press the RF ON/OFF key to turn on the
RF.
2.5.3 TEST PROCEDURE
The following paragraphs briefly out-
line a general functional test proce-
dure for the 2500. Verify measurements
to the limits of the test equipment
used, if desired.
2.5.3.1 FREQUENCY
Use the keyboard (Section 3.5.2.1) to
set the output frequency to 500 MHz at
a 0 dBm power level, with no modula-
tion. Measure the output frequency.
Use the spin knob (Section 3.5.2.2) to
change the output frequency to 1000
MHz. Measure the output frequency. Use
the keyboard to set the frequency to
100 MHz. Measure the frequency. Use
the spin knob to set the frequency to
200 MHz. Measure the frequency.
2-3
2.5.3.2 OUTPUT POWER
Set the output frequency at .4 MHz with
no modulation. Use the keyboard to set
the output power level at +13 dBm.
Measure output power. Use the spin
knob to set output power to -7 dBm.
Measure the output power. Set the
output frequency to 400 MHz. Measure
the output power. Use the keyboard to
change the output power to +13 dBm.
Measure the output power. Set the
output frequency to 1100 MHz. Measure
the output power. Use the spin knob to
change the output power to -7 dBm.
Measure the output power.
2.5.3.3 AM
Set the output frequency at .4 MHz and
power level at -7 dBm. Select INT AM
and the 1000 Hz internal source. Set
internal AM at 90%. Measure AM. Change
the output frequency to 550 MHz.
Measure AM. Select the 400 Hz internal
source. Measure AM.
2.5.3.4 PH
Set the output frequency to 275 MHz
and the power level at 0 dBrn. Select
INT PM ana the 1000 Hz internal source.
Set internal PM deviation at 99.9 kHz.
Measure the deviation. Change the
output frequency to 500 MHz. Measure
deviation. Select the 400 Hz internal
source. Measure FM deviation.
2.5.3.5 EXTERNAL AM/PH
Tne user may elect to insert an exter-
nal modulation source at the MOD IN
connector on the front panel (item 24
of Figure 3-1) and repeat steps 2.5.3.3
and 2.5.3.4 for EXT AM and EXT PH
outputs. Select EXT AM and EXT PM by
pressing the appropriate keyboard
switch.
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3.1 INTRODUCTION
This section provides the complete
operating instructions for the Wavetek
Model 2500 RF Signal Generator. No
preparation for operation is required.
The user may choose to perform the
optional initial installation checks
contained in Section 2 of this manual.
The 2500 may be operated locally using
the front panel controls or remotely
through the GPIB interface on the rear
panel, under computer/controller in-
structions.
3.2 AIR FILTER CAUTION
Regularly check the air flow filter
installed over the intake vents on the
bottom of the unit. Clean or change as
necessary. Air filter maintenance is
described in the Maintenance Section
of this manual.
3.3 FRONT PANEL DESCRIPTION
Front panel operating controls, dis-
plays, and connectors are shown in
Figure 3-1. All controls necessary for
local (manual) operation of the unit
are located on the front panel, with
the exception of the "OPERATE/ AutoCal®
keylock s" .. i tch and the external ref-
erence source selector switch on the
rear panel of the unit. Front panel
features are identified by number in
Figure 3-1. Each numbered feature is
briefly described in the following
paragraph with the same number.
3-1
SEC'!'ION 3
OPERATING INSTRUCTIONS
1. POWER
The power switch turns on/off the 2500.
CAUTION
Allow a 2-second time interval between
turning power off and on. The fan has
a current protection circuit that turns
off if excess current is drawn. If the
uni t is turned off and on too quickly
the surge current could cause the pro-
tection circuit to disengage power to
the fan, resulting in possible damage
to the instrument.
Features numbered 2 through 13 are
function controls (keys) and are
grouped together into a keypad for
operator convenience. Keys numbered 2
through 7 are associated with selecting
the modulation source, if any.
2. INT .AM
The internal .AM key selects the in-
ternal amplitude modulation mode of
operation and is associated with key 4.
3. EXT .AM
The external .AM key selects the ex-
ternal amplitude modulation mode. An
external source, connected at the MOD
IN connector (feature 24) provides the
amplitude modulation source.
4. 400/1000
The 40011000 key determines which in-
ternal source rate, 400 or 1000 Hz,
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I 'WAVETEK --llee 11Hz SI ;na1 Guna+or _od.1 26ee
lIodulatlon
21 ~Id:::::===~~ lC::==: =========:::!J~ ~~ ~
o
EJB
15 16
---------- ---~---- -===-
IMm~P0·
~. @
Id~m~
ION~~~
0012-0o~6163
Figure 3-1. Wavetek Model 2500 Front Panel
3-2
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DN: cn=ArtekMedia, o=ArtekMedia.com, ou,
[email protected], c=US
Date: 2011.06.18 21:06:09 -05'00'

provides the internal AM modulation
selected by key 2, above, or the in-
ternal FM modulation selected by key 5,
below.
5. INT FM
The internal FM key selects the in-
ternal frequency modulation mode of
operation and is associated with key 4,
above.
6. EXT FM
The external FM key selects the ex-
ternal FM modulation mode. An external
source, connected at the MOD IN con-
nector (feature 24) provides the fre-
quency modulation source.
7. MOD OFF
The modulation off key turns off all
modulation of the carrier wave, selec-
ting an unmodulated CW RF output.
8. STR
The store key initiates the procedure
to store front panel settings in non-
volatile RAM (Random Access Memory).
There are 15 locations available for
stored settings. (See feature 13).
9. RCL
The recall key initiates the procedure
to recall front panel settings from
storage locations in non-volatile RAM.
10. LCL
If the unit is in the remote control
mode of operation (GPIB), the local
key may be used to reestablish front
panel control of the 2500 from the
remote control source. (Please note
that GPIB documentation is provided in
Section 6 of this manual.)
When the unit is in the Local Mode of
operation, the LCL switch turns on/off
the display backlighting.
3-3
11. FREQ
The frequency key initiates
cedure to establish the
carrier frequency.
12. LVL
the pro-
RF output
The level key initiates the procedure
to establish the RF output power level.
13. INIT
When the unit is in the Local Mode of
operation, the initialize key sets the
front panel controls to the values
stored as stored setting #15 (see
feature 8, above).
When the unit is in the remote mode
(GPIB), the INIT key provides an SRQ
message to the GPIB bus. (See Section
6 of this manual for greater detail.)
14. NUMERIC ENTRY KEYPAD
Numeric data is entered using the keys
grouped together in this 12 key keypad.
The digits (0-9) and a decimal point
( .) are represented by individual
keys. The +/- key is used to establish
the sign of an entry (positive or
negative) .
Features 15 and 16 work together to
allow the operator fine and coarse con-
trol of output frequency, output level,
AM depth (%), and FM deviation (kHz).
Use of features 15 and 16 are described
in detail later in this chapter.
15. SPIN KNOB
Rotating the spin knob in a clockwise
direction will increase the values
listed immediately above. Counter-
clockwise rotation will decrease those
values.
16. .....-+
The left and
the spin knob
and establish
right arrow keys below
function as cursor keys
the digit in a function
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display (see items 21 througb 23) con-
trolled by the spin knob. This "reso-
lution" digit and the digits to its
left are controlled by the spin knob.
The resolution digit is underlined on
the display. Digits to the right of
the resolution digit will not change
as the spin knob is rotated.
Features 17 through 19 serve to ter-
minate RF frequency, level, and modu-
lation settings.
17. MHz/mV
The MHz/mV key
frequency (MHz)
entry.
18. kHz/lJV
terminates
or output
an output
level (mV)
The kHz/lJV key terminates output
frequency and FM deviation (kHz) and
output level (lJV) entries.
19. 'o/dBm
The %/dBm key terminates AM modulation
depth (c;;.) and output level (dBm)
entries.
20. RF ON/OFF
The RF on/off key is used to switch
the RF signal on and off at the RF out
connector (feature 25).
Features 21 through 23 are the displays
that indicate operational status of
the instrument and provide information
about the RF output characteristics.
21. MODULATION DISPLAY
The modulation display indicates the
modulation status of the output RF
signal. The output signal may be un-
modulated, CW, indicated by the display
annunciator "OFF". The signal may be
amplitude (AM) or frequency (FH) modu-
lated, using an internal or external
modulating source. The display annun-
ciators are "INT AM", "EXT AM, "INT
FM", and "EXT FM" for each AM or FM
3-4
output. Complex modulation (a combina-
tion of A¥, and FM) may be used. AM is
shown on the display as % modulation,
FM as kHz deviation. The operator may
select an internal modulation rate of
400 or 1000 Hz, with the selected
source shown on the display. The
numeric value for the AM or FM used is
shown on the display. The digit con-
trolled by the spin knob, the resolu-
tion digit (see features 15 and 16,
above) is underlined on the display.
Finally, the modulation display will
show the characters REM when the unit
is under remote control.
22. FREQUENCY DISPLAY
The frequency display indicates the
frequency of the RF carrier output in
MHz. The numeric indicators include an
underlined resolution digit used with
spin knob control of the frequency
(see features 15 and 16, above). This
display contains annunciators that
indicate an unlocked phase locked loop
(UNLOCKED), front panel settings are
being stored (STORED), front panel
settings are being recalled (RECALLED),
and the instrument is performing an
automatic frequency calibration (CAL).
During automatic calibration the
oscillator being calibrated (numbered
1-4) and the various calibration points
(1-51, depending on the oscillator)
are indicated as calibration proceeds.
23. LEVEL DISPLAY
The level display indicates the level
of the output RF signal in dBm, mV, or
lJV. The numeric indicators include an
underlined resolution digit used with
spin knob control of the output level
(see features 15 and 16). This display
also contains annunciators that
indicate when the RF circuit breaker
is tripped (TRIPPED), when the leveler
circuits are not functioning (UNI.VD),
and whether the RF output is on or off
(RF ON/RF OFF).
Features 24 and 25 are input and
output connectors, respectively.
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