3-11. 1300 Mhz Channel Input Levels - HP 5305 B Operating And Service Manual

Model 5305B
Operation
9E-3-11. 1300 MHz Channel Input Levels
9E-3-12. The 1300 MHz channel is a 50-ohm system with a
maximum input of 5V rms. Figure 9E-3-1 provides a
conversion scale for determining respective levels of
The "S" annunciator on the 5300 lights during the high-resolution mode whenever
the input is beyond the proper frequency range, or too weak to measure, or during
acquisition following signal interruption.
1.
90 MHz - 1300 MHz Input Jack. With RANGE
switch set to A, accepts input frequencies from 90
MHz to 1300 MHz. Input sensitivity is 20mV. 50
ohm input impedance and ac coupled. Maximum
input is 5V rms. Fuse is located inside jack. Use a
BNC connector as a wrench to remove and tighten
the fuse jack. Replacement HP part number for fuse
is 2110-0301.
2.
ATTENUATOR Control. Provides manual control
of input attenuator circuit for 1300 MHz channel.
MIN position provides minimum signal attenuation.
MAX position provides maximum attenuation.
AGC circuit gives >47 dB dynamic range.
PREAMP POWER. Supplies + 15V @ ≈ 40 mA to
3.
power 10855A Preamplifier.
4. 100 MHz Input Jack. When RANGE is set to B,
9E-3-2
Figure 9E-3-2. Front Panel Controls, Connectors, and Indicators
voltage, power, and dBm. This scale applies to a 50-ohm
system and is not applicable to the 100 MHz channel. The
shaded area represents the specified operating range of the
1300 MHz channel.
NOTE
accepts input frequencies from 50 Hz to 100 MHz.
With RANGE set to B HIGH RESOLUTION,
accepts frequencies up to 10 kHz. Input sensitivity
is 20 mV rms. Input impedance is 1 Megohm
shunted by less than 40 pF. Channel is ac coupled.
5.
RANGE switch. Allows selection of either of the
two input channels or the self-check mode. In the
CHK position, allows system to count the internal
10 MHz clock signal. Measurement is not affected
by signals connected to the input jacks.
6.
RESOLUTION
significant digit displays the measured resolution of
the input signal that is selected with the switch. For
example, 10 Hz selected with 6,789 Hz input
frequency: counter displays 6.78 kHz.
Switch. The counter's least-