Technical data

2-14 Service Guide 85309-90082
Operating Information LO/IF Distribution Unit
Performing the Operator’s Check 85309B
Performing the Operator’s Check
Function
The Operator’s Check verifies that the 85309B functions properly before permanent installation in the
antenna test system. It may also be used as a stand-alone check anytime that a problem is suspected with
the 85309B.
Description
The Operator’s Check drives an LO power signal into the rear panel LO INPUT (J1) port and measures the
power output response of the LO channels (reference and test) across the entire frequency range of
operation. It also checks the Reference IF and Test IF channels. Passing the Operator’s Check indicates that
all 85309B internal cables have stable connections and that the amplifiers are working properly.
The Operator’s Check consists of the following tests:
• “LO Power Output Test” on page 2-15
• “Reference IF and Test IF” on page 2-18
Equipment Required
Table 2-2 Equipment Required for the Operator’s Check
Equipment Type Recommended Model or Part Number Alternate Model or Part Number
PNA/ENA
a
a. If users don’t have a PNA, an ENA may be used. The PNA and ENA can supply the LO signal since the LO
sources only need to operate over the frequency range of 0.1 to 18 GHz. The LO source must also be able
to supply –35 dBm to 6 dBm power.
Any PNA with frequency range up to 18 GHz Any ENA with frequency range up to 18 GHz
30 dB pad
attenuator
b
b. An external 30 dB pad attenuator is required if the receiver does not have an internal step attenuator.
08493-60017 11708A or equivalent
Power meter E4418B/19B N1913A
Power sensor E4413A 8485A
Cables 85131C 85131E
Adapter, 3.5 mm
(m–m)
83059A 85052-60014
Adapter, Type N
(m) to SMA (m)
1250-1636 equivalent
Adapter, BNC (f)
to SMA (m)
1250-1200 equivalent
Adapter, SMA
(f–f)
1250-1158 equivalent