Specifications

18
See definition of specifications and supplemental characteristics on page 16.
The marker must be positioned at least 20 dB above the
noise or the intersection of the signal with an adjacent
signal and more than four divisions up from the bottom of
the CRT. Counter resolution is normally a function of
frequency span but may be specified directly using SHIFT =.
Accuracy: For spans < 100 kHz: frequency reference
accuracy x displayed frequency ±2 x frequency
counter resolution.
For spans > 100 kHz but ≤ 1 MHz: freq ref accuracy x
displayed frequency ±(10 Hz + 2 x frequency counter
resolution).
For spans > 1 MHz: ± (10 kHz + frequency counter resolution).
Stability
Residual FM
< 3 Hz peak-to-peak for sweep time ≤ 10 sec; span
< 100 kHz, resolution bandwidth ≤ 30 Hz, video bandwidth
≤ 30 Hz.
Drift
(After 1-hr. warm-up at stabilized temperature)
Frequency spans ≤ 100 kHz, < 10 Hz/minute of SWEEPTIME;
> 100 kHz but < 1 MHz, < 100 Hz/minute of SWEEPTIME;
> 1 MHz, < 300kHz/minute of SWEEPTIME.
Because of a correction on retrace, analyzer drift only
occurs during the period of one sweep.
Spectral purity
Noise sidebands
Offset SSB phase noise
from carrier dBc (1 Hz BW)
300 Hz –90
3 kHz –100
30 kHz –107
Refer to Figure 2 for typical SSB noise limits.
Figure 2. Typical SSB noise versus offset from carrier
Power line related sidebands
> 85 dB below the peak of a CW signal.
Amplitude
Measurement range
–135 dBm to +30 dBm.
Displayed values
Scale
Over a 10-division CRT vertical axis with the reference level
(0 dB) at the top graticule line.
Calibration
Log: 10 dB/div for 90 dB display from reference level
5 dB/div for 50 dB display
expanded from
2 dB/div for 20 dB display
] reference level
1 dB/div for 10 dB display
Linear: 10% of reference level/div when calibrated
in voltage.
Fidelity
CRT linearity and log or linear fidelity affect amplitude
accuracy at levels other than the reference level.
Log: (over 0 to 90 dB display)
Incremental Accuracy: ±0.1 dB/dB over 0 to 90 dB display
Maximum cumulative error: (from the reference level)
3 MHz to 30 Hz Res BW
< ±1.0 dB max over 0 to 80 dB display, 20° to 30 °C
< ±1.5 dB max over 0 to 90 dB display, 10 Hz Res BW
2.1 dB max over 0 to 90 dB display
Linear: ±3% of Reference Level.
Reference level
Range
Log: +30.0 to –99.9 dBm or equivalent in dBmV, dBµV, volts.
Expandable to +60.03 to –119.9 dBm (–139.9 dBm
≤ 1 kHz resolution bandwidth) using SHIFT I.
Linear: 7.07 volts to 2.2 µvolts full scale.
Expandable to 223.63 volts to 2.2 µvolts (0.22 µvolts
< 1 kHz resolution bandwidth) using SHIFT I.
Signals at the reference level in log translate to
approximately full scale signals in linear, typically within
± 1 dB at room temperature.
Accuracy
The sum of the following factors determines the accuracy
of the reference level readout. Depending upon the
measurement technique followed after calibration, some
of these sources of uncertainty may not be applicable.
An internal error correction function reduces the uncertainty
introduced by analyzer control changes from a state defined
during the calibration of the instrument when SHIFT W is
executed just prior to the signal measurement (i.e., at the
same temperature) within the 20 ° to 30 °C range. All
uncertainties, corrected and uncorrected, assume the
analyzer has had a minimum of one hour warm-up time.
Calibrator uncertainty
±0.2 dB.
3 Maximum input must not exceed +30 dBm damage level.
Specifications