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LEVEL CONTROL RANGE
(Without step attenuator)
37317A 37325A 37347A 37369A 37397A
Above Reset
Power*
+10 dB +10 dB +10 dB +20 dB +20 dB
Below Reset
Power
-25 dB -25 dB -25 dB -20 dB -20 dB <47 GHz
-12 dB ³47 GHz
*Source power above the reset level is allowed but not guaranteed,
especially over the full frequency range.
POWER FLATNESS
Frequency Range (GHz) Flatness (dB)
0.0225 to 13.5 ±1.5
13.5 to 20 ±2.0
20 to 40 ±3.0
40 to 65 ±5.0
SOURCE PURITY
(Specifications apply for all models at maximum rated
power.)
Harmonics & Harmonic Related:
15 dBc (37325A, 37347A, 37369A, 37397A)
35 dBc (37317A)
Nonharmonics: 35 dBc (standard)
Phase Noise: >60 dBc/Hz at 10 kHz offset and 20 GHz
center frequency
SOURCE FREQUENCY ACCURACY
Standard Time Base:
Aging: <1x10
-6
/year
Stability: <1x10
-6
over +15
o
C to +50
o
C range
High Stability Time Base (Option 10):
Aging: <1x10
-9
/day
Stability: <5 x 10
-9
over 0
o
C to +55
o
C range
GROUP DELAY CHARACTERISTICS
Group Delay is measured by computing the phase change
in degrees across a frequency step by applying the for
-
mula:
τ
g
d
df
=−1
1
360
/
Φ
Aperture: Defined as the frequency span over which the
phase change is computed at a given frequency point. The
aperture can be changed without recalibration. The mini
-
mum aperture is the frequency range divided by the num
-
ber of points in calibration and can be increased to 20% of
the frequency range without recalibration. The frequency
width of the aperture and the percent of the frequency
range are displayed automatically.
Range: The maximum delay range is limited to measur
-
ing no more than +180° of phase change within the aper
-
ture set by the number of frequency points. A frequency
step size of 100 kHz corresponds to 10 ms.
Measurement Repeatability (sweep to sweep): For
continuous measurement of a through connection, RSS
fluctuations due to phase and FM noise are:
141
22
.[( ) ( )]Phase Noise in deg Residual FM Noise in Hz
g
+×τ
05
360
.
()Aperture in Hz
Accuracy:
Error in
Error in Phase deg
Aperture Freq E
gg
ττ=+×
\()
[.
360
rror Hz
Aperture Hz
()]
()
VECTOR ERROR CORRECTION
There are five methods of calibration:
1) Open-Short-Load (OSL). This calibration method
uses short circuits, open circuits, and terminations (fixed
or sliding)
2) Offset-Short (waveguide): This calibration method
uses short circuits and terminations.
3) LRL/LRM: The Line-Reflect-Line (LRL) or
Line-Reflect-Match (LRM) calibration uses transmission
lines and a reflective device or termination (LRM).
4) TRM: The Thru-Reflect-Match calibration uses short
circuits and fixed termination.
5) AutoCal: The VNA will serially drive an external
AutoCal module to perform a 2-port OSLT calibration.
AutoCal is a single two port calibration module with
built-in, switched, and characterized OSLT standards.
AutoCal provides quick, reliable, and accurate calibra
-
tions that exceed the performance of a standard broad
-
band load OSLT calibration.
There are four vector error correction models available:
1) Full 12-Term
2) One Path/Two Port
3) Frequency Response (Transmission/Reflection)
4) Reflection Only
Full 12-term can always be used, if desired, since all
373XXA-series models automatically reverse the test sig
-
nal. Front-panel display indicates the type of calibration
stored in memory. Front-panel button selects whether cali
-
bration is to be applied, and an LED lights when error cor
-
rection is being applied.
Calibration Sequence: Prompts the user to connect the
appropriate calibration standard to Port 1 and/or Port 2.
Calibration standards may be measured simultaneously or
one at a time.
Calibration Standards: For coaxial calibrations the user
selects SMA, GPC-3.5, GPC-7, Type N, 2.4 mm, TNC, K,
or V Connector from a calibration menu. Use of fixed or
sliding loads can be selected for each connector type.
User defined calibration standards allow for entry of open
373XXA MM D-7
APPENDIX D PERFORMANCE SPECIFICATIONS