Model 8640B
TM 9-4935-601-14-7&P
scales are automatically selected to give the maximum
indicator resolution for any output level.
1-55. The maximum output level of +19 dBm permits
high level tests on receiver IF's, amplifiers, and mixers
without additional power 'amplification. At the same
time, extremely low leakage ensures receiver sensitivity
measurements down to levels of 0.03 uV in a shielded
system.
1-56. For improved accuracy at low output levels, the
meter, in conjunction with the attenuator, is factory-
calibrated against a precision standard to remove much
of the error that is accumulated from the attenuator
steps. Using a power meter and calibrating the output
for one output frequency and vernier setting, it is then
possible to make sensitivity measurements to better
than +1 dB accuracy down to output levels of -127 dBm.
1-57. OPTIONS
1-58. Option 001
. Option 001 (covered in this manual)
provides a modulation oscillator that is continuously
settable from 20 Hz to 600 kHz. The oscillator can also
be set for 400 Hz or 1 kHz fixed tones.
1-59. Option 002
. Option 002 (not covered in this
manual) provides an internal, active frequency doubler
that extends the frequency range of the generator to
1024 MHz (to 1100 MHz with overrange).
1-60. Option 003
. Option 003 (not covered in this
manual) provides reverse power protection to the
generator's output attenuator and amplifier. It is
particularly useful when using the generator to test
transceivers.
1-61. Option 004
. Option 004 (not covered in this
manual) provides a demodulated output and modified
AM circuitry that can be used to set very accurate AM
depths. It also provides a 1 dB output step attenuator in
addition to the standard 10 dB output step attenuator.
These features allow the generator to be used to test
VOR, ILS, and VHF communications receivers.
1-62. ACCESSORIES SUPPLIED
1-63. The Model 8640B is supplied with the following
accessories (they are shown in Figure 1-1)
Line Power Cable (HP 8120-1378)
2 Amp Fuse (HP 2110-0002)
1 Amp Fuse (HP 2110-0001)
1-64. The following accessories are mounted inside the
instrument's chassis and are available for adjustment
and repair (for more information, see Sections V and
VIII):
Combination Wrench (HP 08640-00027)
Spare fuses for power supply circuit boards
Spare power supply regulator integrated circuit
30-Pin Extender Board (HP 08640-60036)
1-65. EQUIPMENT AVAILABLE
1-66. A Rack Mounting Kit is available to install the
instrument in a 19-inch rack. Rack Mounting Kits may
be obtained through your nearest HIewlett-Packard
Office by ordering HP Part Number 5060-8740.
1-67. Termination
. The HP Model 11507A
Termination maintains the generator's output level
calibration when the output is connected to load
impedances other than 50 ohms. It can provide source
impedances of 25 and 5 ohms, and it can simulate a
broadcast-band dummy antenna. The frequency range
is 50 kHz to 65 MHz.
1-68. 75 Ohm Adapter
. The HP Model 11687A 50 to
75 Ohm Adapter connects to the generator's output to
provide a source impedance of 75 ohms.
1-69. Doubler
. The HP Model 11690A Doubler
extends the usable frequency range of the generator
one octave to 1024 MHz (actually to 1100 MHz with 7%
frequency over-range). Conversion loss in the doubler
is typically <13 dB.
1-70. Mixer
. The HP Model 10514A Double Balanced
Mixer can be used at the generator's output as a
nanosecond pulse modulator or as a balanced mixer.
1-71. Protective Cover
. The HP 5060-8767 Control
Panel Cover protects the panel from dust and impact
damage.
1-6
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