Accessories Supplied; Equipment Available - HP 8756A Operation Manual

General Information
Option 910 provides one additional Operating
and Service Manual (and suppliment). To
obtain additiona 1 Operating and Service
Manuals after initial shipment, order by manual
part number. listed on the title page and rear
cover of this manual.
1-38. ACCESSORIES SUPPLIED
1-39. Figure 1-1 shows the 8756A Scalar Net-
work Analyzer HP- IB cable and power cable.
The power cable supplied depends upon the
country of destination. Refer to Section II of this
manual for HP Part Number information.
1-40. EQUIPMENT REQUIRED BUT NOT
SUPPLIED
1-41. A swept microwave source with 27.8 kHz
modulation capability, (internal or through the
use of an external modulator) and from one to
three detectors and/ or directional bridges are
required to make microwave measurements with
the 8756A Refer to EQUIPMENT AVAILABLE
for specific examples.
EQUIPMENT AVAILABLE
1-42. 11664AIB Detectors
1-43. Up to three Model 11664NB Detectors
may be used with the 8756A. The 11664NB
detects the envelope of the 27.8 kHz modulated
RF signal. Each detector uses a biased Schottky
diode to achieve -50 dBm sensitivity. The fre-
quency range of the 11664A Detector is 10 MHz
to 18 G Hz. The extended frequency range of the
11664B Detector is 10 MHz to 26.5 GHz.
1-44. 85020AIB or 85021 AlBIC Direc-
tional Bridges
1-45. The 85020A/B and 85021A/B/C are
Directional Bridges designed for the 8756A and
8755C Scalar Network Analyzers. Within each
bridge, one zero-bias Schottky diode detector
measures the return loss of the test device. Ratio
measurements may be made by adding a power
splitter (HP 11667A) and detector (HP 11664N
B). The 85020A has a frequency range of 0.0 I to
4.3 GHz. with a nominal impedance of 50 ohms.
The 85020B has a frequency range of 0.01 to 2.4
GHz with a nominal impedance of 75 ohms.
The 85021NB provides an extended frequency
range, with the 85021A (APC-7 test port connec-
1-4
Model8756A
tor) and the 85021 C (Precision Type N test port
connector) covering 0.01 to 18 GHz. and the
85021 B (APC-3.5 test port connector) covering
0.01 to 26.5 GHz. 85021A/B/C nominal
impedance is 50 ohms.
1-46. 11665B Modulator
1-47. The 11665B Modulator is required if the
RF signal source used does not have the
capability of modulating the RF output at a 27.8
kHz rate. The 11665B Modulator modulates test
signals from 15 MHz to 18 GHz with the 27.8
kHz from the 8756A. Refer to the Section III
Operation portion of this manual for further
information on test setup and measurements
regarding the use of the 11665B Modulator.
1-48. 11 666A Reflectometer Bridge
1-49. Reflection measurements from 40 MHz
to 18 GHz may be made with one coupling
device using the 11666A Reflectometer Bridge.
With the addition of an external 11664NB
Detector, two simultaneous ratio measurements
of insertion and return loss may be made. Refer
to the Section III Operation portion of this
manual for further information on test setup
and measurements regarding the use of the
11666A Reflectometer Bridge.
1-50. 11667 A Power Splitter
1-51. The 11667A Power Splitter is recom-
mended when making low loss wideband
transmission measurements with the 8756A
This two-resistor type splitter provides excellent
output SWR at the auxiliary arm when used for
source leveling or ratio measurement applica-
tions. The 0.25 dB tracking between output arms
over a frequency range of de to 18 GHz allows
wideband measurements to be made with a
minimum of uncertainty.
1-52. 11678A Low Pass Filter Kit
1-53. The 11678A Low Pass Filter Kit contains
five low pass filters with the following cutoff fre-
quencies: 11688A 2.8 GHz: 11689A 4.4 GHz:
11684A. 6.8 GHz: 11685A, 9.56 GHz:and
11686A 13.0 GHz. The use of low pass filters is
recommended to reduce undesirable harmonics
generated by the RF source when making pre-
cise broadband measurements.