Equipment information
IFR AN 1840 Spectrum analyzer
Manufacturer:
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Model:
AN 1840
Date:
1997
Category:
Group:
Description:
Spectrum Analyzer
Information
The AN1840 is a microprocessor controlled, digitally
synthesized spectrum Analyzer. The AN1840 utilizes a numeric
keypad, dedicated function keys, multitask Soft Function
Keys and a high resolution LCD to display, enter and edit
functions and data. Testing is done manually using external
front panel controls or remotely through the RS-232 or
IEEE-488 external Interface. Microprocessor controlled
memory allows storage and recall of parameters for each of
the major testing modes as well as storage and recall of
traces for signal comparison.
1-2 STANDARD FEATURES
The AN1840 Spectrum Analyzer spans a range from 0 Hz to 26,5
GHz, at up to +30 dBm. The AN1840 input impedance is 50 Ω.
The AN1840 operates as a Spectrum Analyzer, Frequency
Counter, Digital Oscilloscope or AM/FM Receiver.
1-2-1 DISPLAY
The AN1840 Display is a color VGA thin film transistor (TFT)
LCD. The graticule area on the LCD has 500 horizontal pixels
by 256 vertical lines. The Display shows up to 4 traces on
the screen for comparison of live or previously stored
signals. The 80 dB of dynamic range in the Logarithmic
display mode is expandable to 120 dB. The Linear display
mode provides dB units in addition to the regular power and
voltage units, eliminating the need for external conversions.
1-2-2 MEASUREMENTS WITH THE AN1840 SPECTRUM Analyzer
The AN1840 tests and measures spectral purity, mixer
products, modulation, carrier levels, suppression in Single
Side Band Radios, harmonic levels, RF, EMI, FM deviation, AM
% modulation, signal limits and distortion. The AN1840 is
not limited to only these measurements.
1-2-3 INPUT LEVEL
Maximum input level to the AN1840 is +20 dBm with <10 dB
internal attenuation or +30 dBm with >10 dB internal
attenuation. Maximum pulsed level is +40 dBm with >10 dB
internal attenuation.
CAUTION: SIGNALS EXCEEDING THE MAXIMUM INPUT LEVEL OF +30
dBm MAY CAUSE DAMAGE TO THE SPECTRUM'ANALYZER.
1-2-4 MARKERS
The AN1840 Spectrum Analyzer incorporates the use of single
and dual markers on the Display. Markers provide easy
measurement of any portion of displayed signal. The Delta
function shows differences in levels and time or frequency.
Markers have peak search capability.
1-2-5 EXTERNAL ATTENUATION/GAIN OFFSET
An offset value compensating for external attenuation and
gain eliminates manual calculations.
By setting an offset value equal to the sum of all external
attenuation and gain factors, the AN1840 automatically
displays true levels for signals requiring amplification or
attenuation prior to entry into the AN1840. The offset also
compensates for losses present when dealing with antenna
factors.
1-2-6 FREQUENCY Counter
The frequency Counter provides selectable resolution at
narrow or wide frequency span settings. Resolution is set to
1, 10, 100 or 1000 Hz.
Manual Type:
User Manual
Pages:
272
Size:
8.94 Mbytes (9379468 Bytes)
Language:
english
Revision:
Manual-ID:
1002-0401-200
Date:
Quality:
Scanned document, all readable.
Upload date:
2015 05 25
MD5:
491164bc8c73c7b8400db1d89c002958
Downloads:
1039
Information
Table of Contents
Page
General Section ... 1-3…1-36
Table of PCBs and Circuit Diagrams ... 1-3
Table of Features ... 1-4
Test Equipment / Jigs ... 1-5
Specifications ... 1-5
Service Instructions ... 1-6
Operating Hints ... 1-22
Diagnostic Programme ... 2-2
Adjustment Procedures ... 3-2
Layout of the PCBs
and Circuit Diagrams ... 4-1…4-58
Wiring Diagram ... 4-1
Block Circuit Diagram
• Power Supply ... 4-2
• Digital ... 4-3
• Digital/Servo ... 4-4
• IN/OUT ... 4-6
• Interface (Audio/Video) ... 4-7
• Audio ... 4-8
• Video/Chroma ... 4-9
Oscillograms ... 4-14
Layout of PCBs and Circuit Diagrams see page 1-3
Drive Mechanism ... 5-16…5-30
Test Equipment / Jigs ... 5-16
Cleaning ... 5-16
Maintenance and Inspection of the Drive Mechanism ... 5-17
Names of the Main Mechanical Parts ... 5-17
Checking the Mechanism Mode Positions ... 5-19
Operating the Mechanism in the Service Test Mode ... 5-20
Overview of Operating Modes ... 5-20
Replacing Parts of the Drive Mechanism ... 5-21
Adjustments ... 5-29
Exploded Views and
Spare Parts Lists ... 6-1…6-20