Marconi - 2440 - Counter
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Marconi 2440
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Equipment:
2440
Date:
1985
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Information
FEATURES
1. The 2440 is a frequency counter intended primarily for microwave use
but offering continuous frequency measurement over the range 10 Hz to 20
GHz. Frequency cover is divided between three input channels A, B and C
which accept 10 Hz to 100 MHz, 50 MHz to 600 MHz and 600 MHz to 20 GHz
respectively.
The instrument employs the principle of harmonic heterodyne frequency
conversion under microprocessor control and has good sensitivity and
dynamic range with short gate times and high resolution. This system also
has wide f.m. tolerance and short signal acquisition times.
2. The measurement is displayed on nine 7-segment l.c.d. digits with
annunciators giving the frequency units and other supporting information
relating to the instrument's status. The accuracy of measurement is
dependent only on the time base over most of the frequency range and
depends on which of three alternative crystal oscillators has been installed.
The crystal oscillator remains active independent of the front panel supply
switch thereby maintaining temperature stability and accuracy.
3. Resolution is controlled by a group of keyswitches in decade steps from
0.1 Hz to 10 kHz with automatic positioning of the decimal point and
indication of overflow. On input C, an immediate display of the overflow
decades is available allowing all 12 digits to be seen. In the AUTO resolution
mode,
the gate time is automatically lengthened up to a maximum of 1 s in order to
fill all 9 digits of display without overflow.
4. The rate at which the display is up-dated can be varied from 8 readings/s
to 1 reading every 20 s by two keyswitches. Other major functions of the 2440
include an OFFSET mode in which the measured frequency may be added to
or subtracted from the numerical offset entered into the instrument either via
the keyboard or from a previous measurement. A low-pass filter can be
introduced into the ’A* channel in order to reduce the noise bandwidth when
low frequencies are to be measured. A range of automatic self test and
diagnostic
^ routines can be brought into action via the RESET key. 4
5. The GPIB interface unit permits full remote operation of all the functions
(except the supply switch) via the General Purpose Interface Bus (GPIB).*
6. A 12 bit digital to analogue converter module, available as an optional
accessory, may be fitted in place of the GPIB unit. This provides an analogue
voltage output of any three consecutive digits from the maximum of 12
decades of frequency data available within the instrument.
7. Other accessories provide a comprehensive range of servicing and
operating aids.
1 Manual
User manual
Manual type:
User manual
Pages:
46
Size:
3.1 MB
Language:
english
Revision:
Manual-ID:
46881-486G H 52440-900N
Date:
March 1985
Quality:
Scanned document, all readable.
Upload date:
Jan. 6, 2019
MD5:
c27cabc6-e43d-427a-170d-8427d30c0f08
Downloads:
461