Fluke 9640A Series, Instruction Manual, Page: 173 / 324

HP 3335A Command Emulation
Preparing the Instrument for Remote 3335A Emulation
4E
4E-5
Commands Not Emulated
The following table lists the commands which are are silently ignored by the Instrument.
Command
3335A
Code
Comment
Store S Stores the current setup in one of 0-9 slots
Recall R Restores a setup from one of 0-9 slots
Phase increment P Sets the phase Increment value
Display Last Entry L Used to display the last entry so that it can be edited
Clear C Stops the special PAD attenuator mode
PAD selection T Selects 1 of 7 attenuators to give a specific level output
Other Differences in Emulation Mode
Table 4E-1 identifies differences between the HP3335A and the Instrument operating in
emulation mode.
Table 4E-1. Emulation Differences
HP3335A 9640A
Sweep timing can be changed between X mode (10
second sweep) and Y mode (50 second sweep),
and the sweep continues without restart. Does not emulate this behaviour because it needs
to calculate the sweep parameters before the sweep
starts.
Has a Sweep Output Connector to provide a 0 to +2
volts sweep ramp for driving external equipment. Does not have this feature.
Has a front panel switch to select 50
Ω
or 75
Ω
output. There is also a bus command to do this. The
instrument takes 1.76 dBm off the 50
Ω
output.
Requires a different head to be manually inserted to
produce correctly levelled 75
Ω
signals, 6.4 dBm
down from the 50
Ω
output.
Provides phase continuous frequency sweep. Provides phase continuous sweep for output
frequencies below 15 MHz, but at frequencies
above 15 MHz hardware ranging will cause phase
discontinuities in the output waveform.
Balanced 124
Ω
/ 135
Ω
/ 150
Ω
output The only outputs available are at 50
Ω
and 75
Ω
,
from a precision N-series male connector.
Isolated from the GPIB bus by opto couplers,
effectively isolating the instrument from the bus. The GPIB ground is connected to earth ground and
the RF signal common is floating.