Atec Agilent-8901A User Manual
HP 8901A Modulation Analyzer
150 kHz to 1300 MHz
Technical Specifications
H
Outstanding signal
characterization
All parameters describe performance in automatic operation or
properly set manual conditions. Specifications describe the
instrument’s warranted performance. Supplemental characteristics (shown in italics) are intended to provide information useful
in applying the instrument by giving typical, but non-warranted,
performance parameters.
RF Input
Frequency Range: 150 kHz to 1300 MHz.
Operating Level:
150 kHz to 650 MHz: 12 mV
(1 W
peak
).
650 MHz to 1300 MHz: 22 mV
(1 W
peak
).
(−25 dBm) to 7 V
rms
(−20 dBm) to 7 V
rms
rms
rms
Supplemental Characteristics
Tuning: Automatic, track (frequencies >10 MHz),
manual frequency entry.
Acquisition Time (automatic operation): ~1.5
second.
Input Impedance: 50 Ω nominal.
Maximum Safe Input Level:
AC: 35 V
(25 W for source SWR <4)
rms
DC: 40 V
Frequency Modulation
Rates:
150 kHz to 10 MHz: 20 Hz to 10 kHz.
10 MHz to 1300 MHz: 20 Hz to 200 kHz1.
Deviations:
150 kHz to 10 MHz: 40 kHz peak maximum.
10 MHz to 1300 MHz: 400 kHz peak maximum1.
1 Maximum rate 20 kHz and peak deviation 40 kHz with 750 µs
de-emphasis filter.
2 Peak residuals must be accounted for in peak readings.
3 With 750 µs de-emphasis and pre-display “off,” distortion is not
specified for modulation autopilots >4 V peak. This can occur near
maximum deviation for a measurement range at rates <2 kHz.
4 For optimum flatness, cables should be terminated with their
characteristic impedance.
Accuracy:
2
250 kHz to 10 MHz: ±2% of reading ±1 digit, 20 Hz
to 10 kHz rates.
10 MHz to 1300 MHz: ±1% of reading ±1 digit, 50 Hz
to 100 kHz rates.
±5% of reading ±1 digit, 20 Hz to 200 kHz rates.
Demodulated Output Distortion:
3
400 kHz to 10 MHz: <0.1% THD, deviations <10 kHz.
10 MHz to 1300 MHz: <0.1% THD, rates and
deviations <100 kHz.
AM Rejection (for 50% AM at 400 Hz and
1 kHz rates):2 <20 Hz peak deviation measured
in a 50 Hz to 3 kHz BW.
Residual FM (50 Hz to 3 kHz BW): <8 Hz
rms
at
1300 MHz, decreasing linearly with frequency
to <1 Hz
for 100 MHz and below.
rms
Supplemental Characteristics
Maximum Deviation Resolution:
1 Hz, <4 kHz deviation.
10 Hz, 4 kHz to 40 kHz deviation.
100 Hz, 40 kHz to 400 kHz deviation.
Resolution: Is increased one digit with 750 µs
de-emphasis and pre-display on.
Demodulated Output Distortion: 150 to 400 kHz;
<0.3% THD, deviations <10 kHz.
Detectors: + peak, - peak, and average (rms sine
wave calibrated).
Demodulated Output Across an Open Circuit
(600 Ω output impedance):
4
1 mV/Hz when resolution is 1 Hz.
0.1 mV/Hz when resolution is 10 Hz.
0.01 mV/Hz when resolution is 100 Hz.
Stereo Separation (50 Hz to 15 kHz): >47 dB.
Phase Modulation
Carrier Frequency: 10 MHz to 1300 MHz.
Rates: 200 Hz to 20 kHz.
Deviation and Maximum Resolution:
400
0.1 Radian
Resolution
40
0.01 Radian
Resolution
4
0.001 Radian
Peak phase deviation (radians)
Resolution
200 Hz 1 kHz 10 kHz 20 kHz
Modulation rate
Accuracy: 2 ±3% of reading ±1 digit.
Demodulated Output Distortion: <0.1% THD.
AM Rejection (for 50% AM at 1 kHz rates):
2
<0.03 radians, peak deviation.
Supplemental Characteristics
Modulation Rates: Usable from 20 Hz to 100 kHz
with degraded performance.
Detectors: + peak,−peak, average (rms sine wave
calibrated).
Demodulated Output across an Open Circuit
(600 Ω output impedance):
4
1 V/rad when resolution is 0.001 radian.
0.1 V/rad when resolution is 0.01 radian.
0.01 V/rad when resolution is 0.1 radian.
Amplitude Modulation
Rates:
150 kHz to 10 MHz: 20 Hz to 10 kHz.
10 MHz to 1300 MHz: 20 Hz to 100 kHz.
Depth: to 99%.
Accuracy:
150 kHz to 10 MHz: ±2% of reading ±1 digit,
50 Hz to 10 kHz rates, >5% depth.
±3% of reading ±1 digit, 20 Hz to 10 kHz rates.
10 MHz to 1300 MHz: ±1% of reading ±1 digit,
50 Hz to 50 kHz rates, >5% depth.
±3% of reading ±1 digit, 20 Hz to 100 kHz rates.
Flatness (variation in indicated AM depth for
constant depth on input signal):
10 MHz to 1300 MHz: ±0.3% of reading ±1 digit,
90 Hz to 10 kHz rates, 20 to 80% depth.
2, 5
Demodulated Output Distortion: <0.3% THD for
≤50% depth, <0.6% THD for ≤95% depth.
FM Rejection (at 400 Hz and 1 kHz rates, 50 Hz
to 3 kHz BW):
250 kHz to 10 MHz: <0.2% AM for <5 kHz
2
peak
deviation.
10 MHz to 1300 MHz: <0.2% AM for <50 kHz
peak
deviation.
Residual AM (50 Hz to 3 kHz BW): <0.01%
rms
.
Supplemental Characteristics
Maximum Depth Resolution:
0.01% for depths ≤39.99%.
0.1% for depths ≥40%.
Detectors: peak [+ peak], trough [−peak],
average (rms sine wave calibrated).
Demodulated Output Across an Open Circuit
(600 Ω output impedance):
4
0.1 V/percent when resolution is 0.01%.
0.01 V/percent when resolution is 0.1%.
Frequency Counter
Range: 150 kHz to 1300 MHz.
Sensitivity:
150 kHz to 650 MHz: 12 mV
650 MHz to 1300 MHz: 22 mV
Accuracy: Reference accuracy ±3 counts of least
significant digit.
Internal Reference:
Frequency: 10 MHz.
Aging Rate: <1x10−6/month.
(Optional: <1x10−9/day)6.
Supplemental Characteristics
Modes: Frequency, and frequency error (displays
the difference between the frequency entered
via the keyboard and the actual RF input
frequency).
Sensitivity in Manual Tuning Mode: Approximate
frequency must be entered from keyboard.
0.22 mV
(−60 dBm).
rms
Maximum Resolution:
10 Hz for frequencies <1 GHz.
100 Hz for frequencies ≥1 GHz.
Internal Reference Accuracy: Overall accuracy
is a function of time base calibration ± aging
rate ± temperature effects ± line voltage effects
± short term stability.
(−25 dBm).
rms
(−20 dBm).
rms
2 Peak residuals must be accounted for in peak readings.
4 For optimum flatness, cables should be terminated with their
characteristic impedance.
5 For peak measurements only, AM accuracy may be affected by
distortion generated by the modulation analyzer. In the worst
case this can decrease accuracy by 0.1% of reading for each 0.1%
of distortion
6 After 30-day warm-up
Standard Option 002
Aging Rate <1 x 10
Temperature Effects <2 x 10
Line Voltage Effects <1 x 10
-6
/mo. <1 x 10
-7
/° C <2 x 10
-6
(+5%, −10% line
voltage change)
Short term stability — <1 x 10
2
<6 x 10
-9
-9
/day
-10
/° C
-10
for 1s average
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