H
HP 8901A Modulation Analyzer
150 kHz to 1300 MHz
Technical Specifications
Outstanding signal
characterization
All parameters describe performance in automatic operation or
properly set manual conditions. Specifications describe the
instrument’s warranted performance. Supplemental characteris-
tics (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
rms
(
−
25 dBm) to 7 V
rms
(1 W
peak
).
650 MHz to 1300 MHz: 22 mV
rms
(
−
20 dBm) to 7 V
rms
(1 W
peak
).
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
rms
(25 W for source SWR <4)
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 kHz
1
.
Deviations:
150 kHz to 10 MHz: 40 kHz peak maximum.
10 MHz to 1300 MHz: 400 kHz peak maximum
1
.
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
rms
for 100 MHz and below.
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
µ
s
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.
1 Maximum rate 20 kHz and peak deviation 40 kHz with 750
µ
s
de-emphasis filter.
2 Peak residuals must be accounted for in peak readings.
3 With 750
µ
s 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.
