HP 8444A - General Specifications

Model 8444A
General Information
Table 1-1. System Specifications
These system specifications describe the performance
available from the spectrum analyzer-tracking generator
system in various types of applications. In all cases it is
assumed that the spectrum analyzer is equipped with
either an 8554B or 8555A Tuning Section, 8552A or
8552B IF Section, 140T or 141T Display Section.
SWEPT FREQUENCY RESPONSE MEASUREMENTS
The tracking generator is used as a signal source to
measure the frequency response of a device.
Dynamic Range: > 90 dB from spectrum analyzer 1 dB
gain compression point to average noise level
(approximately —10 dBm to —100 dBm). Spurious
responses not displayed.
Gain Compression: For —10 dBm signal level at the
input mixer, gain compression < 1 dB.
Average Noise Level: > —102 dBm with 10 kHz IF
bandwidth.
Absolute Amplitude Calibration Range:
Spectrum Analyzer:
Log: From —122 dBm to +10 dBm, 10 dB/div on
a 70 dB display or 2 dB/div on a 16 dB display
(8552A has 10 dB/div only).
Linear: From 0.1 pV/div to 100 mV div (85554),
20 mV/div (8554B) in a 1,2 sequence on an 8-
division display.
Tracking Generator (Drive Level to Test Device): 0
to —10 dBm continuously variable. 0 dBm cali-
brated to +0.5 dB at 30 MHz.
Frequency Range: 500 kHz to 1250 MHz with:
8554B and 10 MHz to 1300 MHz with 8555A,
Scan Width (Determined by Spectrum Analyzer
Controls}:
Per Division: With 8555A, 16 calibrated scan widths
from a 2 kHz/div to 200 MHz/div in a 2, 5, 10 se-
quence. With 8554B, 15 calibrated scan widihs
from a 2 kHz/div to 100 MHz/div in 2, 5, 10
sequence,
Full Scan: 0--1250 MHz with 8554B; 0--1300 MHz
with 8555A.
Zero Scan: Analyzer is fixed tuned receiver.
Frequency Resolution: 1 kHz.
Stability: —
Residual FM (peak to peak):
Tuning Section Stabilized Unstabilized
8554B/8555A 200 Hz 10 kHz
Amplitude Accuracy:
System Frequency Response: +1.5 dB.
Tracking Generator Calibration: 0 dBm at 30
MHz to +0.5 dB.
SWEEP/CW GENERATOR
The tracking generator-spectrum analyzer system can be
used to supply test signals for other devices as a sweeper.
Frequency: Controlled by spectrum analyzer. Range is
500 kHz to 1250 MHz with the 8554B and 10 MHz
to 1300 MHz with the 85554.
Frequency Accuracy: +10 MHz (85548), +15 MHz
(8555A) using spectrum analyzer tuning dial. Can be
substantially improved using external counter output.
Spectral Purity:
Residual FM (peak-to-peak):
Tuning Section Stabilized Unstabilized
8554B/8555 A 200 Hz 10 kHz
Harmonic Distortion: Typically 25 dB below output
level,
Nonharmonie (spurious) Signals: > 35 dB below
output level.
Flatness: + 0.5 dB.
Long Term Stability: Drift typically less than 30
kHz/hour when stabilized after 2-hour warmup,
Sweep Width: 20 kHz to 1250 MHz (85548) or 1300
MHz (8555A).
Sweep Rates: Selected by Scan Time per Division on
spectrum analyzer. 16 internal scan rates from 0.1
msec/div to 10 sec/div in a 1, 2, 5 sequence. Manual
Scan is available with the external sweep voltage
from the 8444A or by a front panel control of the
8552B IF Section.
PRECISION FREQUENCY MEASUREMENTS
An external counter output is provided on the 8444A
for precision frequency measurements. The frequency of
unknown signals as well as the frequency of any point
on a frequency response curve can be measured. The use
of the HP 5300A/5303A Counter is suggested for
frequency measurements to 500 MHz and the HP
5245L/5254C Counter for measurements to 1300 MHz.
Frequency Accuracy:
For unknown signals +10 kHz. (Tracking drift
typically 5 kHz/10 min after 2-hour warmup.)
For points on frequency response curve, counter
accuracy + Residual FM.
Counter Mode of Operation:
Manual Scan: Scan determined either by front panel
control of 8552B IF Section or by external scan
signal provided by the 8444A,
Zero Scan: Analyzer is fixed tuned receiver. Coun-
ter reads center frequency to accuracy of
tracking drift.
Counter Output Level: 0.1 V rms.
GENERAL SPECIFICATIONS
Temperature Range: Operation, 0 to 55°C, storage
40 C to 75°C,
Power: 115V and 230V, 48 to 440 Hz, 12 watts max. |
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