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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