Frequency Accuracy - HP 8555A Operating And Service Manual

General Information
Mode!8555A
Table 1-1. 8555A/8552A/8552B Specifications
1-4
FREQUENCY SPECIFICATIONS
FREQUENCY RANGE
Tuning Range
With internal mixer: 0.01 - 18.00 GHz.
With external mixer: 12.4 - 40 GHz.
Selectable continuous coarse (by means of push-
pull knob) and fine tuning determine display
center frequency.
Harmonic Mixing Mode
Signal Identification: Signal identifier separates
unknown input signal in center of CRT into
two images 2 divisions apart with image on left
slightly less in amplitude when the calibrated
frequency scale is advanced to the appropriate
band.
Scan Width
Full Scan: Inverted marker positioned by tuning
control identifies the frequency that becomes
the center frequency for scan width per divi-
sion and zero scan modes. The width of the
scan depends on mixing mode. Scan width
=
n
x 2000 MHz, where n is the mixing mode; e.g.,
for n
=
2, scan width is 4 GHz.
Per Division: 16 calibrated scan widths from 2
kHz/div to 200 MHz/div in a 2, 5, 10
sequence.
Manual Scan: (Available with 8552B only.) Scan
determined by front panel control; continu-
ously variable across
CRT
in either direction.
Zero Scan: Analyzer becomes fixed tuned re-
ceiver with frequency set by frequency and
fine tune controls and selectable bandwidths
by bandwidth control. Amplitude variations are
displayed versus time on CRT.
FREQUENCY ACCURACY
Dial Accuracy: n x (±15 MHz) where n is the mix-
ing mode.
Scan Accuracy: Frequency error between two
points on the display is less than 10% of the indi-
cated separation.
Stability:
Total Analyzer Residual FM (Fundamental
Mixing)
Stabilized
<100Hz
peak-to-peak
Unstabilized
<10kHz
peak-to-peak
First LO residual FM typically 30 Hz.
Noise Sidebands: For fundamental mixing. More than
70 dB below CW signal, 50 kHz or more away from
signal, with 1 kHz IF bandwidth and 100Hz video
filter.
RESOLUTION
Bandwidth Ranges: IF bandwidths of 0.10 to 300
kHz provided in a 1, 3 sequence.
Bandwidth Accuracy: Individual IF bandwidth 3 dB
points calibrated to ±20%. (10 kHz bandwidth
±5%).
Bandwidth Selectivity:
60 dB/3 dB Bandwidth Ratio
IF Bandwidth 8552A 8552B
10 kHz - 300 kHz
1kHz- 3kHz
0.1 kHz - 0.3 kHz
20:1
20:1
25:1
20:1
11:1
11:1
AMPLITUDE SPECIFICATIONS
ABSOLUTE CALIBRATION RANGE
Measurement Rang:e
,_[~~-~~ii:O"""""'i~~J
See "Input Specifications" for maximum
levels to INPUT .01 - 18 GHz connector and
to input mixer.
Log Reference Level: From -130 dBm to + 10
dBm, in 10 dB steps. Log reference level ver-
nier, 0 to -12 dB continuously.
Linear Sensitivity: From 0.1 11V/div to 100
mV/div in a 1,2 sequence. Linear sensitivity
vernier 1 to 0.25 attenuation ratio continu-
ously.
Sensitivity
Average Noise Level: Specified for 1 kHz band-
width. Using lower bandwidths will improve
average noise level; e.g., use of 100 Hz band-
width will improve noise level in the 1.5 to
3.55 GHz frequency range from -117 dBm to
-127 dBm max.
With INTERNAL Coaxial Mixer
Frequency Mixing
IF Freq.
Average
Range
Mode
(MHz)
Noise Level
(GHz) (n)
(dBm max.)
0.01- 2.05
1- 2050 -115
1.50 - 3.55 1- 550
-117
2.07- 6.15 2-
2050 -108
2.60- 4.65
1+ 550 -117
4.11- 6.15
1+
2050 -115
4.13 - 10.25
3- 2050
-103
6.17 - 10.25
2+
2050
-105
6.19 - 14.35
4- 2050 - 95
8.23 - 14.35
3+
2050 -100
10.29 - 18.00
4+
2050 - 90
With 11517 A EXTERNAL Waveguide Mixer and
Appropriate Waveguide Tapers
Frequency Range Average Noise Level (Typ.)
12.4 - 18.0 GHz -90 dBm
18.0 - 26.5 GHz -85 dBm
26.5 40.0 GHz -75 dBm