HP HP 8901A Modulation Analyzer 150 kHz to 1300 MHz Product Overview
Summary
HP 8901A Modulation Analyzer Product Overview (150 kHz to 1300 MHz). Measures carrier power/frequency/stability, AM depth, FM deviation, hum/noise, and audio frequency response. Input protection up to 25 watts. Optional calibration mode for metrology laboratories.
Page 1 Text Content
HP 8901A Modulation Analyzer 150 k Hz to 1300 MHz
Outstanding signal Product Overview characterization
Measurements* Applications
Frequency Mobile Radio Range: 150 k Hz to 1300 MHz The HP 8901A Modulation Analyzer combines all the capabilities
Resolution: necessary for making accurate transmitter measurements. It 10 Hz below 1000 MHz, can be used in making all the tests listed below. It can also be 100 Hz above 1000 MHz used to test modules and subassemblies from either the trans- mitter or receiver. For reliability, input power protection reduces
Input Level:
the chance of accidentally damaging the modulation analyzer by
Automatic Mode: −20 d Bm to
connecting it directly to a high power transmitter.
+30 d Bm Manual Mode: Typically • Carrier power −60 d Bm to +30 d Bm
• Carrier frequency and stability • AM depth
Power • FM deviation
• Hum and noise
Display: Peak envelope power
• Incidental AM or FM
Range: 1 milliwatt to 1 watt
• Modulation limiting
Accuracy: Typically ±1.5 d B
- Instantaneous
Input Power Protection:
- Steady state
>25 watts
• Audio frequency response
Modulation
Maintenance and Metrology
Frequency Modulation
Accurately measuring modulation has long been a problem for
Rates: 20 Hz to 200 k Hz metrology laboratories. The HP 8901A Modulation Analyzer
Deviations: to 400 k Hz helps solve this problem two ways. First, it provides an extremely accurate method of measuring AM depth and FM deviation, and
Accuracy: ±1% of reading ±1 digit
it recovers the modulation with little degradation for making
for rates 30 Hz to 100 k Hz
measurements such as modulation distortion. Second, the optional Amplitude Modulation calibrators provide a precise modulation source for calibration. There are many metrology and maintenance uses for the modula-
Rates: 20 Hz to 100 k Hz
tion analyzer. They include:
Depths: to 99%
• Signal generator calibration
Accuracy: ±1% of reading ±1 digit
• Modulation calibration standard
for rates 50 Hz to 50 k Hz and
depths >5% • VCO and VCXO characterization
Phase Modulation Rates: 200 Hz to 20 k Hz
Deviations: to 400 radians *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
Accuracy: ±3% of reading ±1 digit provide information useful in applying the instrument by giving typical, but non-warranted, performance parameters.
Page Summary Contents For HP HP 8901A Modulation Analyzer 150 kHz to 1300 MHz Product Overview
Manual Details
| Brand | HP |
|---|---|
| Pages | 8 |
| File Size | 62.83 KB |
| Published | June 22, 2026 |
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Frequently Asked Questions
What is the measurement frequency range?
The usable range for measurements is from 150 kHz to 1300 MHz.
How accurately can this analyzer measure AM depth and FM deviation?
It offers an accuracy of ±1% of reading ±1 digit for both parameters.
What types of modulation rates can be measured?
Rates range from 20 Hz to 200 kHz, or 30 Hz to 100 kHz depending on the function.
Does the instrument include protection against high input power?
Yes, it features input power protection to prevent accidental damage, with varying limits depending on the mode (e.g., Automatic Mode: -20 dBm to +30 dBm).