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2308-900-01 Rev. A / July 2008
Section 3: Pulse Current Measurements
Model 2308 Portable Device Battery/Charger Simulator User’s Manual
3. Take specified number of readings. The supply synchronizes to only the first reading. After
taking the first reading, the supply no longer synchronizes to the selected edge nor does it
wait for a trigger delay (internal or user trigger delay).
In the pulse current digitization mode with a integration time (SENS:TIME:DIG) of 33
μ
s, readings
are generated approximately every 244
μ
s for battery channel (313
μ
s for charger channel) and
placed in the instrument measurement output buffer. The 244
μ
s or 313
μ
s time interval is the sum
of the integration period, 33
μ
sec, and the period required to convert this information into a
measurement, approximately 211
μ
sec for battery channel (280
μ
s for charger channel). These
conversions time will be needed as the integration time for digitization is increased. However, the
approximate time for a reading stored in the buffer will be the integration time + conversion time.
The instrument initiates the storage and conversion process for the desired number of iterations,
as specified with the AVERAGE command, when the :TLEVel threshold is exceeded. The
message DIGITIZE is displayed instead of readings. The NO PULSE message will be displayed if
the pulse is not detected. Pulse current digitization is selected by disabling trigger synchronization:
SENS[1]:PCUR:SYNC <b>
battery channel (#1)
SENS2:PCUR:SYNC <b>
charger channel (#2)
<b>
= OFF
Select pulse current digitization (trigger synchronization disabled).
= ON
Select pulse current measurements (trigger synchronization enabled).
The commands to set the trigger level and trigger delay for pulse current measurements also apply
for pulse current digitization. However the trigger delay can be set up to five seconds.
SENS[1]:PCUR:SYNC:DEL <NRf>
battery channel (#1)
SENS2:PCUR:SYNC:DEL <NRf>
charger channel (#2)
<NRf> = 0 to 5
User trigger digitization delay in seconds
(10
μ
sec steps). For digitization, the internal
trigger delay is 10
μ
sec.
To detect the pulse, the digitization process synchronizes to the edge specified by the
following command:
SENS[1]:PCUR:MODE <name>
battery channel (#1)
SENS2:PCUR:MODE <name>
charger channel (#2)
<name> = HIGH or AVER
Sync up to rising edge of pulse for 1st
reading of digitization.
= LOW
Sync up to falling edge of pulse for 1st
reading of digitization.
After any specified delay period expires, the instrument takes the number of readings specified by
the average count command:
SENS[1]:PCUR:AVER <NRf>
battery channel (#1)
SENS2:PCUR:AVER <NRf>
charger channel (#2)
<NRf> = 1 to 5000
Digitize 1 to 5000 readings.
Pulse current step method
Use the pulse current step method to perform a series of different trigger level measurements on
the same current range. This method is available on the battery channel through GPIB operation
only -
SENS:PCUR:STEP
commands (see
Table 3-3
). Use this method to decrease the time
required to take a sequence of measurements. To use this method, properly set trigger level steps,
integration time, time-out setting, and current range for the entire sequence of measurements. Out
of these settings, only trigger level may be set to a unique value for each step - settings for
NOTE
Pulse current digitization
for a programming example.
Summary of Contents for 2308
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