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HP 85047A S-parameter test set
The HP 85047A S-parameter test set provides the
capability to simultaneously measure the reflection
and transmission characteristics of two-port devices in
either direction with a single connection. This test set
includes a frequency doubler that can be switched in
by an HP 8753B/C Option 006 to measure 3 MHz to 6
GHz in a single sweep or switched out to measure 300
kHz to 3 GHz in a single sweep. The HP 8753ES
Option 011 does not use the frequency doubler, so the
full 300 kHz to 6 GHz range is available. This test set
exhibits <5 dB insertion loss between the RF input and
the test ports for as high as 15 dBm at the test port,
and also includes a programmable step attenuator.
There are two rear panel BNC outputs. One provides a
TTL signal which indicates the result of a limit test.
The second TTL output is controlled from the
HP 8753ES test sequence function.
Specifications
Impedance 50 ohms
Frequency range 300 kHz to 3 GHz and
3 GHz to 6 GHz
(HP 8753B/C);
300 kHz to 6 GHz
(HP 8753D/E/ES Opt. 006)
Directivity
1
300 kHz to 1.3 GHz 35 dB
2
1.3 GHz to 3 GHz 30 dB
3 GHz to 6 GHz 25 dB
Typical tracking
1
Transmission magnitude, phase
3
300 kHz to 3 GHz ±1.5 dB, ±10˚
3 GHz to 6 GHz +0.5, -2.5 dB, ±20˚
Reflection magnitude, phase
3
300 kHz to 3 GHz ±1.5 dB, ±10˚
3 GHz to 6 GHz ±1.5 dB, ±20˚
Source match
1
300 kHz to 1.3 GHz 20 dB
1.3 GHz to 3 GHz 16 dB
3 GHz to 6 GHz 14 dB
Normal insertion loss
Input to port 1,2
300 kHz to 3 GHz 4.0 dB +0.8 dB/GHz
3 GHz to 6 GHz 17.5 dB +0.8 dB/GHz
Input to R
300 kHz to 3 GHz 19 dB +0.5 dB/GHz
3 GHz to 6 GHz 34 dB +0.5 dB/GHz
Port 1,2 to A,B 16 dB
Typical Isolation
4
300 kHz to 3 GHz 100 dB
3 GHz to 6 GHz 90 dB
Test port switch
repeatability
±0.03 dB; ±0.01 dB
4
Maximum operating level +20 dBm
Damage level +30 dBm
RF attenuator range 70 dB (10 dB steps)
DC bias range ±30 VDC, 200 mA, no
degradation in RF
specs, 1A max.
RF connectors
Port 1,2
7 mm precision
All others 50 ohm type-N(f)
Dimensions 90 mm H x 432 mm W x 553 mm D
Weight 10 kg (22 lb)
A standard HP 85047A test set contains a solid-state
transfer switch, which allows continuous switching of
power from port 1 to port 2 for full two-port error cor-
rection. Option 009 replaces the transfer switch with a
mechanical switch. This provides about 2.5 to 3.5 dB
more power at the test port, but does not allow contin-
uous switching, so the user must initiate updates of all
four S-parameters for full two-port error correction.
Also, the mechanical switch has relays that will wear
out faster than the solid-state switch. Approximate
lifetime of the mechanical switch is 1 million cycles.
HP 85047A schematic
1. This can be greatly improved with accuracy enhancement.
2. Some degradation at environmental extremes below 600 kHz.
3. Degrees, specified as deviation from linear phase.
4. Typical performance.