Key measurements include:
• Frequency counter
• Absolute RF power
• Tuned RF level
• TRFL with tracking
• AM depth
• FM deviation
• oI M deviation
• Modulation rate
• Modulation distortion
• Modulation SINAD
• Audio frequency
• Audio AC level
• Audio distortion
• Audio SINAD
New features:
• Auto carrier triggering
• CCITT filters
Agilent N5531S
Measuring Receiver
Data Sheet
Up to 50 GHz
• Metrology-grade measurement
accuracy built on the tradition
of excellence
• Off-the-shelf, general-purpose
instruments with specialized
PSA measurement personality
• Best for signal source and
step attenuator calibrations
• Abundant features with
easy-to-use user interfaces
• Sensor modules covering up
to 50 GHz with single input
connection
Conditions and Requirements
The Agilent N5531S measuring
receiver system is comprised of
a PSA spectrum analyzer with
Option 233, a P-Series power
meter, and an N5532A sensor module for metrology and
calibration applications. To
achieve the optimal measurement results as specified, the
best metrology practice must
be applied and the required
instrument conditions must be
met.
PSA is the core component
instrument of the N5531S
measuring receiver. The PSA
instrument conditions included in the PSA specification
guide must be met to meet the
N5531S specifications.
Additional conditions required to meet specifications
• The system components are
within their calibration cycle
• Tuned RF Level measure-
ment is set to "High Accuracy
Mode"
• Fast Mode is set to "Off"
when performing modulation
measurements
• For center frequency
< 20 MHz, DC coupling is
applied
• At least 2 hours of storage
or operation at the operating
temperature of 20 to 30 °C
• The PSA has been turned on
at least 30 minutes with Auto
Align On selected or if Auto
Align Off is selected, Align
All Now must be run:
• Within the last 24 hours,
and
• Any time the ambient
temperature changes more
than 3 °C
• After the analyzer has been
at operating temperature at
least 2 hours
• For analog modulation
measurements, a direct
connection between the
PSA and the device under
test (DUT) is required to
achieve the best performance
and meet the specifications
for all test frequencies
• The following PSA options
are required in addition to
Option 233 as stated in the
specifications:
• Option 123 (pre-selector
bypass) must be installed
to meet TRFL specifications
above 3 GHz
• Option 107 (audio input
100 kohm) is required with
Option 233 (built-in
measuring receiver person ality) for the audio analysis
• Option 1DS (pre-amplifier
between 100 kHz and
3.05 GHz)
(pre-amplifier
10 MHz up to 50 GHz)
needed to achieve better
sensitivity as indicated in
the data sheet
or Option 110
between
is
2
2
Key Specifications
For detailed specifications, refer to the “Measuring receiver personality” chapter in the PSA specifications guide.
1.1 Frequency modulation
Description Specification Supplemental information
Input power rangea –18 to +30 dBm
Operating rate range
100 kHz ≤ fc < 10 MHz 20 Hz to 10 kHz
10 MHz ≤ fc < 50 GHz 50 Hz to 200 kHz
Peak frequency deviationsa Peak Deviation = IFBW/2 -Modulation Rate.
100 kHz ≤ fc < 10 MHz 40 kHz maximum IFBW
10 MHz ≤ fc ≤ 50 GHz 400 kHz maximum IFBW
FM deviation accuracyb
Frequency range Modulation rate Peak deviation ß c
250 kHz to 20 Hz to 200 Hz to > 0.2 ±1.5% of reading
10 MHz 10 kHz 40 kHz > 1.2 ±1% of reading
10 MHz to 50 Hz to 250 Hz to > 0.2 ±1.5% of reading
6.6 GHz 200 kHz 400 kHz > 0.45 ±1% of reading
6.6 to 50 Hz to 250 Hz to > 0.2 ±2.5% of reading
13.2 GHz 200 kHz 400 kHz > 8 ±1% of reading
13.2 to 50 Hz to 250 Hz to > 0.2 ±3.8% of reading
31.15 GHz 200 kHz 400 kHz > 16 ±1% of reading
31.15 to 50 Hz to 250 Hz to > 0.2 ±8.5% of reading
50 GHz 200 kHz 400 kHz > 32 ±1% of reading
= 5 MHz in “Auto” mode;
max
= 10 MHz in “Manual” mode
max
AM rejection (50 Hz to 3 kHz BW)
Frequency range Modulation rate AM depths
150 kHz to 3 GHz 400 Hz or 1 kHz ≤ 50% < 10 Hz peak deviation
3 to 6.6 GHz 400 Hz or 1 kHz ≤ 50% < 10 Hz
6.6 to 13.2 GHz 400 Hz or 1 kHz ≤ 50% < 20 Hz
13.2 to 26.5 GHz 400 Hz or 1 kHz ≤ 50% < 40 Hz
26.5 to 50 GHz 400 Hz or 1 kHz ≤ 50% < 75 Hz
Residual FM (50 Hz to 3 kHz BW)
RF frequency
100 kHz to 6.6 GHz < 1.5 Hz (rms)
6.6 to 13.2 GHz < 3 Hz (rms)
13.2 to 31.15 GHz < 6 Hz (rms)
31.15 to 50 GHz < 12 Hz (rms)
Detectors
a. The modulation rates and the peak deviations that the system is capable of measuring are governed by the instrument’s IFBW
(Information Bandwidth) setting. Their relationship is described by the equation: Peak deviation (in Hz) = IFBW/2 - modulation rate.
b. When the carrier frequency fc is less than 10 MHz, to avoid the 0 Hz frequency wrap-around, the fc and IFBW must be chosen to satisfy [fc-(IFBW)/2] > 100 kHz.
c. ß is the ratio of frequency deviation to modulation rate (deviation/rate).
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Available: +peak, -peak, ±peak/2, peak hold, rms
Key Specifications (Continued)
1.2 Amplitude modulation
Description Specification Supplemental information
Input power range –18 to +30 dBm
Operating rate rangea
100 kHz ≤ fc < 10 MHz 20 Hz to 10 kHz
10 MHz ≤ fc < 50 GHz 50 Hz to 100 kHz
Depth range 5 to 99% Capable of measuring AM depth
range of 0 to 99%.
AM depth accuracyb
Frequency range Modulation rate Depths
100 kHz to 10 MHz 50 Hz to 10 kHz 5% to 99% ±0.75% of reading
10 MHz to 50 Hz to 20% to 99% ±0.5% of reading
3 GHz 100 kHz 5% to 20% ±2.5% of reading
3 to 50 Hz to 20% to 99% ±1.5% of reading
26.5 GHz 100 kHz 5% to 20% ±4.5% of reading
26.5 to 50 Hz to 20% to 99% ±1.9% of reading
31.15 GHz 100 kHz 5% to 20% ±6.8% of reading
31.15 to 50 Hz to 20% to 99% ±6% of reading
50 GHz 100 kHz 5% to 20% ±26% of reading
c
Flatness
Frequency range Modulation rate Depths
10 MHz to 3 GHz 90 Hz to 10 kHz 5% to 99% ±0.30% of reading
3 to 26.5 GHz 90 Hz to 10 kHz 5% to 99% ±0.40% of reading
26.5 to 50 GHz 90 Hz to 10 kHz 5% to 99% ±0.60% of reading
FM rejection (50 Hz to 3 kHz BW)
Frequency range Modulation rate Peak FM deviations
250 kHz to 10 MHz 400 Hz or 1 kHz < 5 kHz < 0.14% AM depth
10 MHz to 50.0 GHz 400 Hz or 1 kHz < 50 kHz < 0.36% AM depth
Residual AM (50 Hz to 3 kHz BW) < 0.01% (rms)
Detectors
a. When the carrier frequency fc is less than 10 MHz, to avoid the 0 Hz frequency wrap-around, the fc and IFBW must be chosen to satisfy [fc-(IFBW)/2] > 100 kHz.
b. For peak measurement only: AM accuracy may be affected by distortion generated by the measuring receiver. In the worst case this distortion can decrease
accuracy by 0.1% of reading for each 0.1% of distortion.
c. Flatness is the relative variation in indicated AM depth versus rate for a constant carrier frequency and depth.
e. Preamp must be on to meet this specification for frequency range of 26.5 to 50 GHz.
f. Follow this procedure to verify this specification: Input a clean CW signal (0 dBm) to the measuring receiver; Manually tune the frequency to the input signal;
Set the PSA parameters as follows, (1) IF BW = 6 kHz, (2) Detector type = RMS, (3) High Pass Filter = 50 Hz, (4) Low Pass Filter = 3 kHz, (5) Set “RF Input Ranging”
to “Man”, and decrease the input attenuation at 2 dB/step until “SigHi” message appears, and then back off 2 dB for the “SigHi” message to disappear.
d, e
Available: +peak, -peak, ±peak/2, peak hold, rms
44
Key Specifications (Continued)
1.3 Phase modulation
Description Specification Supplemental information
Input power range –18 to +30 dBm
Operating rate range 100 kHz ≤ fc < 50 GHz 200 Hz to 20 kHz
Maximum peak phase deviation
f
f
24,999 radiansb In “Manual” mode
o
I M accuracy
Frequency range Deviations
100 kHz to 6.6 GHz > 0.7 rad ±1% of reading
> 0.3 rad ±3% of reading
6.6 to 13.2 GHz > 2.0 rad ±1% of reading
> 0.6 rad ±3% of reading
13.2 to 26.5 GHz > 4.0 rad ±1% of reading
> 1.2 rad ±3% of reading
26.5 to 31.5 GHz > 4.0 rad ±1% of reading
> 1.3 rad ±3% of reading
31.5 to 50 GHz > 8.0 rad ±1% of reading
> 2.4 rad ±3% of reading
AM rejection (50 Hz to 3 kHz BW) For 50% AM at 1 kHz rate < 0.03 rad (peak)
< 10 MHz 450 radiansa
c
≥ 10 MHz 12,499 radiansb In “Auto” mode
c
Residual PM (50 Hz to 3 kHz BW)
Frequency range
100 kHz to 6.6 GHz < 0.0017 rad (rms)
6.6 to 13.2 GHz < 0.0033 rad (rms)
13.2 to 31.15 GHz < 0.0066 rad (rms)
31.15 to 50 GHz < 0.0130 rad (rms)
Detectors
a. When the carrier frequency fc is less than 10 MHz, to avoid the 0 Hz frequency wrap-around, the fc and IFBW must be chosen to satisfy [fc- (IFBW/2)] > 100 kHz.
The specification of 450 radians applies for fc = 200 kHz, IFBW = 200 kHz, and a modulation rate of 200 Hz. The specification for maximum peak phase deviation
will linearly improve as the allowed IFBW increase. As fc increases, the IFBW can increase up to the maximum allowed IFBW in “Auto” or “Manual” modes.
b. When the carrier frequency (fc) is equal to or greater than 10 MHz, the maximum peak deviation that the instrument is capable of measuring depends on
the IFBW setting and the modulation rate of the signal-under-test. The relationship is described by the equation:
Max peak deviation (in radians) = [IFBW/(2 x modulation rate in Hz)] - 1
The maximum IFBW used in “Auto” mode is 5 x 10
the maximum IFBW can be set to 10
7
Hz, hence, Max peak deviation (in radians) = (5 x 106/modulation rate in Hz) - 1.
6
Hz, therefore, Max peak deviation (in radians) = (2.5 x 106/modulation rate in Hz) - 1. In “Manual” mode,
Available: +peak, -peak, ±peak/2, peak hold, rms
55
Key Specifications (Continued)
1.4 RF frequency counter
Description Specification Supplemental information
Range 100 kHz to 50 GHz
Sensitivitya In “Auto” mode
100 kHz ≤ fc < 3.0 GHz 0.4 mV
3.0 GHz ≤ fc ≤ 26.5 GHz 1.3 mV
26.5 GHz ≤ fc ≤ 50 GHz 4.0 mV
Maximum resolution 0.001 Hz
Accuracy ± (readout freq. x freq.
ref. accy +0.100 Hz)
Modes Frequency and frequency error (manual tuning)
Sensitivity in manual tuning mode Using manual ranging and changing RBW settings,
sensitivity can be increased to approximately -100 dBm.
(–55 dBm)
rms
(–45 dBm)
rms
(–35 dBm)
rms
1.5 Audio input
b
Description Specification Supplemental information
Frequency range 20 Hz to 250 kHz
Input impedance 100 kΩ (nominal)
Maximum safe input level 7 V
a. Instrument condition: RBW ≤ 1 kHz.
b. All audio measurements require PSA Option 107.
or 20 VDC
rms
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