Keithley 2303, Руководство пользователя

Страница: 49 / 152

Pulse Current Measurements 3-5
Average readings count
Use the AVERAGE READINGS item of the PULSE CURRENT menu item to set the average
readings count. This count specifies the number of measurements (integrations) to average for
each reading. For example, with reading count set to 10, each displayed reading will reflect the
average of 10 pulse current measurements.
Trigger delay and trigger level
Use the following items of the PULSE CURRENT menu item to set trigger delay and trigger
level:
• TRIGGER DELAY — Use to specify additional trigger delay (0 to 100msec in 10µsec
steps). See “Trigger delay” for details.
• TRIGGER LEVEL — Use to set the trigger level. Pulses less than the specified level
are not detected.
Models 2303 and 2303B – Set the trigger level from 0 to 5A in 5mA steps. However,
there is approximately 10mA of trigger hysteresis built into the hardware. Therefore,
if a pulse does not exceed this level, trigger detection will not occur.
Model 2303-PJ – The trigger level can be set for either the 5A or 500mA range. For
the 5A range, the trigger level can be set from 0 to 5A in 5mA steps. For the 500mA
range, the trigger level can be set from 0 to 500mA in 0.5mA steps. However, there is
trigger hysteresis built into the hardware. For the 5A range, trigger hysteresis is ap-
proximately 10mA, and for the 500mA range, trigger hysteresis is approximately
1mA. If a pulse does not exceed the appropriate hysteresis level, trigger detection will
not occur.
The two trigger level ranges for Model 2303-PJ are displayed as follows:
5A Range:
PULSE TRIG LEVEL
A (5.0) 0.000A
500mA Range: PULSE TRIG LEVEL
mA (500) 0.0000 A
To toggle the range for the trigger level, place the blinking cursor on the “A” at the far
right end of the display, and press the
or key. After keying in the trigger level (in
amps), pressing ENTER updates the displayed range for that trigger level.
Pulse current display mode
Pulse current measurements are displayed with the pulse current display mode selected. This
display mode is selected as follows:
NOTE If output settings are presently being displayed (as denoted by a blinking digit in the
voltage or current field), keep pressing the set key until the blinking stops. The instru-
ment can now display measured readings.