Fluke 9500B User Handbook Manual page 67

Deviation (Scope and Direct Mode)
The triangular type of cursor indicates that all
the cursor keys can be used as in other functions.
From the default 00.00%, the deviation
percentage can be changed to any value within
its resolution between -11.20% and +11.20%.
The result of combining the units/division,
multiplier and deviation are shown as the p-p
value of 'O/P Amplitude'.
Output Voltage (Scope and Direct Mode)
The O/P Amplitude is only adjustable by means
of its contributors.
Frequency (Scope and Direct Mode)
The triangular type of cursor indicates that all
the cursor keys can be used.
From the default 50kHz, the output frequency
can be changed to any value within its resolution
between 100mHz and 1.1GHz (O/P
Amplitude ≤3.336Vp-p) or between 100mHz
and 550MHz (any valid O/P Amplitude).
Descriptions assume 9500B/1100
4.6.4.3 Limitations for UUT Scope
input impedance of 1M
The selection of UUT Oscilloscope input
impedance of 50Ω is strongly recommended
when using the Sine Function at high frequency
(e.g. >100MHz). This ensures that the 9500B
output signal is correctly terminated within the
UUT.
There are however many Oscilloscopes that do
not feature an input 50Ω terminator. To address
these instruments the 9500B, when configured
to drive 1MW, applies its own 50Ω terminator
within the Active Head (9510, 9520, 9530
only). However the effectiveness of this
approach is limited by short but finite signal
path length to the UUT input amplifiers and
their input capacitance. Substantial Sine
amplitude errors may result from this un-
terminated transmission line.
Error magnitude and the frequency at which it
becomes significant may vary as UUT input
attenuators are selected (V/div adjustment)
and are highly dependent upon UUT design
and construction.
Errors due to signal path length may be reduced
slightly by using a BNC 50W thru termination
between the 9500 output and the UUT input.
Again effectiveness will be limited by
remaining path length and capacitance within
the UUT.
In all cases frequencies above 500MHz are not
recommended for use into UUT input
Section 4: Using the Model 9500B — Sine Function
Ω
4.6-3