JD700B Series User’s Guide
767
Setting amplitude
Reference level and attenuation
You can set the reference and attenuation levels automatically or manually to optimize the display of the
traces measured, as you desire.
Procedure
To automatically set the reference and attenuation level:
1
Press the
AMP/SCALE
hard key.
2
Press the
Auto Scale
soft key.
Each time you press this key, both of the Y-axis scale and input attenuation level change to be
optimized with some margin.
To set the reference or attenuation level manually:
1
Press the
AMP/SCALE
hard key.
2
To set the maximum reference level on the Y-axis manually, complete the following steps:
Press the
Reference Level
soft key.
Enter a value by using the numeric keys or the rotary knob.
Press your desired unit soft key from the available choices, which vary depending on your
selection of the unit in the
Units
setting.
3
To set the input attenuation level, select one from the following choices:
To set the input attenuator’s level automatically, select
Attenuation > Auto
.
NOTE
It is recommended that you set the
Attenuation
to
Auto
in most situations so that the
level of the input attenuator can be set automatically according to your input signal level.
To set the input attenuation manually up to 55 dB for JD780B series or 50 dB for JD740B
series to optimize S/N, complete the following steps:
Select
Attenuation > Manual
.
Press the
Attenuation Value
soft key to set the level.
Enter a value in fives by using the numeric keys.
Press the
dB
soft key or the
ENTER
hard key.
To change the scale unit:
1
Select
More (1/2) > Units
.
2
Select the unit of the display scale:
dBµV/m
,
dBmV/m
,
dBV/m
,
V/m
,
Watt/m^2
,
dBm/m^2
,
dBW/m^2
,
A/m
,
dBA/m
, and
Watt/cm^2
.
The scale unit on the screen changes accordingly.
Pre-amplifier
You can turn on the internal pre-amplifier to correct and compensate for the gain of the preamplifier so that
amplitude readings show the values at the input connector.
Procedure
1
Press the
AMP/SCALE
hard key.
2
Toggle the
Preamp
soft key and select
On
or
Off
as needed.
NOTE
You can turn on the Preamp when the input attenuation range is from 0 dB to 10 dB. If
the attenuation value is manually set to greater than 10 dB, the instrument will
automatically turn off the pre-amplifier to display low-level signal properly on the chart.
Содержание CellAdvisor JD700B Series
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