Operating Basics
370B User Manual
2-17
Output Mode Selections. The Output Mode selects the Step Generator output
mode. The selected output mode is indicated by the LED. When pressing the
VOLTAGE or CURRENT button while holding down the FAST/ SHIFT button,
the Step Generator OFFSET can be set independently of the STEP AMPLI-
TUDE setting. Pressing the VOLTAGE or CURRENT button while holding
down the FAST/SHIFT button once again cancels this function.
VOLTAGE sets the Step Generator output to a voltage step signal.
CURRENT sets the Step Generator output to a current step signal.
OFFSET AID and OPPOSE. The OFFSET buttons control the offset value. The
offset value ranges from +10 to –10 times the STEP AMPLITUDE at 1%
resolution. The offset value is displayed on the CRT.
AID: The step offset with the same polarity as the polarity setting adds to the
step generator output.
OPPOSE: The step offset with the opposite polarity as the polarity setting
subtracts from the step generator output.
Holding down the FAST/SHIFT button while pressing either of the OFFSET
buttons causes offset changes to be in larger increments.
Simultaneously pressing the AID and OPPOSE buttons sets the offset to zero.
NUMBER OF STEPS. The NUMBER OF STEPS button selects the number of
steps produced by the Step Generator. The number of steps may be selected from
0 to 10, and when 0 is selected, the Step Generator output consists of offset only.
The NUMBER OF STEPS display indicates selected number. When the
COLLECTOR SUPPLY POLARITY mode is +LEAKAGE or –LEAKAGE, the
number of steps is automatically set to 0.
PULSE. LONG or SHORT pulse mode is enabled and the step generator supplies
either pulsed current or voltage to the base or emitter terminal, as selected. With
the aiding offset, the offset is added to the step signal as a pulse. Pulse width:
80us for SHORT and 300 us for LONG. Selecting OFF disables Pulse mode.
Selecting PULSE mode automatically selects the DC mode of COLLECTOR
SUPPLY polarity function. When the Collector Supply POLARITY mode is
+LEAKAGE or –LEAKAGE, the pulse mode is not available.
POLARITY and INVERT. The POLARITY indicator indicates the step generator
output polarity determined by the Collector Supply POLARITY settings,
CONFIGURATION, and the INVERT setting.
Pressing INVERT reverses the step generator output polarity. The LED next to
the INVERT button indicates if the inverted state is selected. When the configu-
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