© Gigahertz Solutions GmbH
Seite 27
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Quantitative (numeric) Measurement:
Setting:
“Range” (measurement range)
Start with the “Range” switch set to “max”, and only switch to “med”
or even “min” if the display constantly shows very low values.
Basic rule for measurement range selection:
As coarse as necessary, as fine as possible.
Important note regarding the setting “VBW Maximum”:
A simultaneous setting of “VBW Maximum” and “Full” may cause a
clearly two-digital meter noise value, and in combination with “Peak
hold” the equilibrium level may after a while even clearly exceed the
value of 100. “The higher the better”, though (much to the surprise
of non-experts), as the higher the value, the higher the actual video
bandwidth, and consequently the better the chance of measuring
short pulse widths.
Therefore, in the case of very low field strengths, please use “med”
or even “min”, the pre-amplifier HV10, “Pulse” and/or “VBW Stand-
ard”.
Recommendations for the range “max”
9
:
Values < 0.15
m
W/m²: switch to “med”
Values > 0.15
m
W/m² and < 1.5
m
W/m²:
Use
preamplifier
HV10
to convert the range of 20,000 (max) to a
range of 2,000! Alternatively, the larger value applies.
If you intend to do comparative measurements (such as “before vs.
after”), please always measure in the same range.
In the case of overload even with the range set to max (display shows
“1” on its left side), the sensitivity of the meter can be reduced by a
factor of 100 by applying the
attenuator
DG20_G3
available as an
optional accessory. By setting the “ext. adapt.” switch to -20 dB on
your instrument, you will ensure a correct display of the measurement
value (please note: there will be an increased noise level).
In the case of especially low values with the “Range” switch set to
“min”, the HV10 should also be applied.
9
In order to maximize the display of power flux densities without having to apply an
attenuator, there is a factor of 100 between “med” and “max”. For technical rea-
sons large tolerances are to be expected. .
Summary of Contents for HF59B
Page 40: ......
