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HP8901A 001

  • Model8901A
  • MakerHP
  • DescriptionModulation Analyzer
  • Option001
  • Rental문의요망
  • Stock문의요망

Very accurate modulation measurements along with very low internal noise enables the 8901A to characterize even high performance signal sources. Its detection system is configured for wideband recovery of the entire modulation spectrum so that highly precise measurements such as signal-to-noise or distortion can be made on the modulation signal. Modulation depth and deviation accuracy is generally ± 1% of reading. Residual AM noise in a 50 Hz to 3 kHz bandwidth is < 0.01% while FM noise is < 8 Hz for 1300 MHz carrier frequencies, decreasing linearity to < 1 Hz below 100 MHz. Because the AM and FM demodulators are independent and highly insensitive to each other and because the analyzer has very low residual AM and FM, accurate and incidental AM and FM measurements can be made.

Three detectors are available for depth and deviation measurements: positive peak, negative peak, and an average-responding detector with rms (sinewave) calibration. A PEAK HOLD function captures and displays the maximum peak modulation of a signal and is ideal for making transient measurements such as modulation limiting on mobile radios.

For measuring convenience, two high-pass (50 Hz and 300 Hz) and three low-pass (3 kHz, 5 kHz and > 20 kHz) post-detection filters for filtering the recovered modulation are included. The > 20 kHz Bessel filter minimizes overshoot on square wave modulation. This allows accurate measurement of signals which are digitally modulated, such as FSK. Four de-emphasis networks commonly used in FM systems (25, 50, 75, and 750 µs) are also provided.

A modulation output provides calibrated signal levels relative to the displayed modulation reading.

Modulation calibrators (Option 010) provide two precision modulation standards. One is an amplitude modulation signal whose depth is calibrated to better than 0.1% accuracy. The second standard is a frequency modulated signal with peak deviation calibrated to 0.1% accuracy. The 11715 AM/FM Test Source is necessary to fully test and calibrate other modulation parameters.

The 8901A Modulation Analyzer is more than just a high quality modulation meter. It also performs as a frequency counter and power meter. Resolution for the 8901A’s 150 kHz to 1300 MHz frequency counter is 10 Hz below 1000 MHz and 100 Hz above 1000 MHz. Sensitivity is -25 dBm (12 mV rms) below 650 MHz and -20 dBm (22 mV rms) above 650 or an optional time base is available with 1X10-9/day stability.

The 8901A uses a diode detection circuit to measure RF input power. This technique measures peak voltage and is calibrated from 1 mΩ to 1 Ω for sine wave inputs. The RF level measurement accuracy is ± 1.5 dB from 150 MHz to 1300 MHz.

RF Input 

  • Frequency Range: 150 kHz to 1300 MHz
  • Operating Level: 12 mV rms to 7 V rms
  • Input Impedance: 50 Ω nominal
  • Tuning: Manual frequency entry, automatic, or track
  • Acquisition Time (automatic operation): ~1.5 s
  • Maximum Safe Input Level (typical): 35 V rms (25 W for source SWR <4), ac; 40 V, dc

Frequency Modulation

  • Rates: 20 Hz to 200 kHz
  • Deviations: To 400 kHz
  • Accuracy: ±2% of reading ±1 digit, 20 Hz to 10 kHz rates, 250 kHz to 10 MHz; ±1% of reading ±1 digit, 50 Hz to 100 kHz rates, 10 to 1300 MHz
  • Demodulated Output Distortion: <0.1% THD
  • AM Rejection (for 50% AM at 400 Hz and 1 kHz rates): <20 Hz peak deviation measured in a 50 Hz to 3 kHz BW
  • Residual FM (50 Hz to 3 kHz BW): <8 Hz rms @ 1300 MHz, decreasing linearly with frequency to <1 Hz rms for 100 MHz and below
  • Maximum Deviation Resolution: 1 Hz
  • Stereo Separation (50 Hz to 15 kHz): >47 dB typical

Phase Modulation

  • Carrier Frequency: 10 to 1300 MHz
  • Rates: 200 Hz to 20 kHz; typically usable from 20 Hz to 100 kHz with degraded performance
  • Deviation: To 400 radians
  • Maximum Deviation Resolution: 0.001 radian
  • Accuracy: ±3% of reading ±1 digit
  • Demodulated Output Distortion: <0.1% THD
  • AM Rejection (for 50% AM at 1 kHz rate): <0.03 radian peak deviation (50 Hz to 3 kHz BW)

Amplitude Modulation

  • Rates: 20 Hz to 100 kHz
  • Depth: To 99%
  • Accuracy: ±2% of reading ±1 digit, 50 Hz to 10 kHz rates, 150 kHz to 10 MHz; ±1% of reading ±1 digit, 50 Hz to 50 kHz rates, 10 to 1300 MHz
  • Flatness (variation in indicated AM depth for constant depth on input signal): ±0.3% of reading ±1 digit
  • Demodulated Output Distortion: <0.3% THD
  • FM Rejection (at 400 Hz and 1 kHz rates, 50 Hz to 3 kHz BW): <0.2% AM
  • Residual AM (50 Hz to 3 kHz BW): <0.01% rms
  • Maximum Depth Resolution: 0.01%

Frequency Counter

  • Range: 150 kHz to 1300 MHz
  • Accuracy: ±3 counts of least significant digit ± reference accuracy
  • Internal Reference
  • Frequency: 10 MHz
  • Aging rate: <1 x 10–6/month (optional: 1 x10–9/day)
  • Maximum Resolution: 10 Hz for frequencies <1 GHz; 100 Hz for frequencies ≥1 GHz

The Agilent 8901A modulation analyzer combines the capabilities of several RF instruments to give complete, accurate characterization of modulated signals in the 150 kHz to 1300 MHz frequency range. The 8901A very accurately measures modulation and recovers the modulation signal. The 8901A determines RF frequency and measures RF power. The 8901A is fully automatic and makes all major measurements at the press of a key or under GPIB control.

The Agilent 8901A is an excellent lab and production tool for accurately characterizing RF signals. Use the 8901A to make accurate AM/FM and FM/AM conversion measurements of phase- and amplitude-sensitive devices such as bandpass filters and multiple-channel receivers. Excellent isolation between AM and FM make it simple to separate the AM and FM of AM stereo, the incidental AM of FM transmitters, and the AM, FM, and FM components of complex signals.

The 8901A is an important component of automatic RF test systems. All functions are fully automatic and easily programmed. With these measurements combined into one instrument, interfacing requirements, hardware costs, and software-development time are reduced.

01 RF Connectors on Rear Panel Only
002 1×10-9/Day Internal Reference
003 Connections for External Local Oscillator
004 Operation from 48 to 440 Hz Power (temp. <40° C)
010 AM and FM Calibrators


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