Rohde Schwarz Rohde & Schwarz HMO1002 2-channel oscilloscope, Digital Storage oscilloscope, 21-1002-RS00 数据表
产品代码
21-1002-RS00
31
Analysis
ased noise. This function can be used for pulse response
tests with start and end values of zero.
tests with start and end values of zero.
The menu item Y-SCALING allows you to scale the FFT in
the amplitude logarithmically (dBm / dBV) or linear (V
the amplitude logarithmically (dBm / dBV) or linear (V
eff
).
The unit dBm (Decibel-Milliwatt) refers to 1 mW. The unit
dBV (Decibel-Volt) refers to 1 Veff. The displayed values
refer to a 50 Ohm terminating resistor. You can use an
external terminating resistor parallel to the high impedance
input.
dBV (Decibel-Volt) refers to 1 Veff. The displayed values
refer to a 50 Ohm terminating resistor. You can use an
external terminating resistor parallel to the high impedance
input.
You can deactivate the FFT function by pressing the soft
menu key FFT OFF or pressing the FFT key on the control
panel again.
menu key FFT OFF or pressing the FFT key on the control
panel again.
9 .3 Quick View
Pressing the QUICKVIEW key
10
in the ANALYZE section
activates several basic automatic measurements. The
QUICK VIEW function allows a quick overview of the typi-
cal signal size. Measurement results are displayed at the
bottom of the screen and with a cursor on the signal.
QUICK VIEW function allows a quick overview of the typi-
cal signal size. Measurement results are displayed at the
bottom of the screen and with a cursor on the signal.
The following five measurement values are displayed di-
rectly in the signal:
rectly in the signal:
❙Maximum voltage (V
p+
)
❙Mean voltage (Mean)
❙Minimum voltage (V
❙Minimum voltage (V
p-
)
❙Rise time (t
r
)
❙Fall time (t
f
)
The following ten measurement values are displayed at the
bottom of the screen:
bottom of the screen:
❙RMS value
Period
❙Peak to peak voltage
Frequency
❙Amplitude
Number of positive /slopes
❙Pos. pulse width
Neg. pulse width
❙Pos. duty ratio
Neg. duty ratio
Pressing the AUTO MEASURE key allows you to change
the six measurement parameters on the bottom right. You
may undo these changes by choosing RESET or restore
the default setting. Only one channel can be active in the
Quickview mode. All measurements will be performed on
the active channel.
the six measurement parameters on the bottom right. You
may undo these changes by choosing RESET or restore
the default setting. Only one channel can be active in the
Quickview mode. All measurements will be performed on
the active channel.
Pressing the QUICK VIEW key again switched off the
function.
function.
9 .4 PASS/FAIL Test based on Masks
The Pass/Fail test allows you to evaluate if a signal is located
within defined limits. This limits are set by a so-called mask.
If the signal exceeds the mask, there is an error. These er-
rors will be displayed together with successful sweeps and
the total of all sweeps at the bottom of the screen. It is also
possible to perform certain actions if errors are discovered.
within defined limits. This limits are set by a so-called mask.
If the signal exceeds the mask, there is an error. These er-
rors will be displayed together with successful sweeps and
the total of all sweeps at the bottom of the screen. It is also
possible to perform certain actions if errors are discovered.
Press the UTIL key in the VERTICAL section and press the
soft menu key PASS/FAIL on page 2|2 to activate the mode
which opens a menu to set and use the mask test. Prior to
soft menu key PASS/FAIL on page 2|2 to activate the mode
which opens a menu to set and use the mask test. Prior to
starting the test by pressing the top soft menu key TEST
ON/OFF, it is necessary to generate or load a mask and to
select an action. To generate a new mask, press the soft
menu key NEW MASK. Masks are displayed as light gray
curves/waveforms on the screen. If a mask was copied or
loaded, you can use menu items to change the expansion
of the signal form and consequently the limits for the test.
ON/OFF, it is necessary to generate or load a mask and to
select an action. To generate a new mask, press the soft
menu key NEW MASK. Masks are displayed as light gray
curves/waveforms on the screen. If a mask was copied or
loaded, you can use menu items to change the expansion
of the signal form and consequently the limits for the test.
In the menu that opens you can use the key COPY CHAN-
NEL to copy the current signal into a mask memory. The
mask displays in white and appears as an overlay of the
output signal. The menu keys Y-POSITION and STRETCH
Y enable you to shift this curve vertically or to enlarge it.
The two menu items WIDTH Y and WIDTH X allow you to
set the tolerance for the mask. The universal knob or the
KEYPAD button in the CURSOR/MENU section are used to
enter values with a resolution of 1/100 division. A mask in-
cludes a minimum and a maximum value for each captured
data value. The minimum and maximum value for a source
curve with only one value per data are identical. The width
indicates the distance between the peripheral points and
the original point. The greater the selected value is, the gre-
ater are the potential curve deviations in the amplitude. The
tolerance mask is displayed in white in the background. The
generated and edited mask can be used immediately for the
test, however, it is only saved temporarily in the instrument
storage. The soft menu key SAVE can be used to store the
mask permanently to a USB stick or to the internal memory.
Press the key MENU OFF to return to the start menu.
NEL to copy the current signal into a mask memory. The
mask displays in white and appears as an overlay of the
output signal. The menu keys Y-POSITION and STRETCH
Y enable you to shift this curve vertically or to enlarge it.
The two menu items WIDTH Y and WIDTH X allow you to
set the tolerance for the mask. The universal knob or the
KEYPAD button in the CURSOR/MENU section are used to
enter values with a resolution of 1/100 division. A mask in-
cludes a minimum and a maximum value for each captured
data value. The minimum and maximum value for a source
curve with only one value per data are identical. The width
indicates the distance between the peripheral points and
the original point. The greater the selected value is, the gre-
ater are the potential curve deviations in the amplitude. The
tolerance mask is displayed in white in the background. The
generated and edited mask can be used immediately for the
test, however, it is only saved temporarily in the instrument
storage. The soft menu key SAVE can be used to store the
mask permanently to a USB stick or to the internal memory.
Press the key MENU OFF to return to the start menu.
Press the soft menu key LOAD MASK to open a file browser
which allows you to load previously stored masks for the
test (file extension .HMK). A loaded mask can be changed
in the menu NEW MASK. Changes will be applied to the file
when the mask is edited and saved.
which allows you to load previously stored masks for the
test (file extension .HMK). A loaded mask can be changed
in the menu NEW MASK. Changes will be applied to the file
when the mask is edited and saved.
Pressing the soft menu key ACTIONS in the PASS/FAIL
main menu opens a menu with the available actions. The
following four actions can be performed:
main menu opens a menu with the available actions. The
following four actions can be performed:
❙Audio signal if the tolerance limits have been exceeded
❙Stop for first-time failure (number is adjustable)
❙Pulse for first-time failure (emits a pulse at the AUX output
❙Stop for first-time failure (number is adjustable)
❙Pulse for first-time failure (emits a pulse at the AUX output
in case of failure)
Fig. 9.3 PASS/FAIL mask test.