3-22 Pulse Current Measurements
Pulse current digitization
The following discussion explains how to digitize a current waveform. A programming
example at the end of this section demonstrates proper command sequence for pulse current
digitization.
Overall steps for digitization:
1. Sync up to desired edge for measurement.
2. After detecting edge, wait for the internal and also any user trigger delay.
3. Take specified number of readings. The supply sy
nchronizes 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, readings are generate
d approximately every 274μs for
battery channel (490μs for charger channel) and placed in the instrument measurement output
buffer. The 274μs or 490μs time interval is the sum of the integration period, 33μsec, and the
period required to convert this information into a measurement, approximately 241µsec for
battery channel (457μs for charger channel). 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> Ch
arger Channel (#2)
<b> = OFF Select pulse current digitization (trigger synchronization disabled).
= ON Select pulse current measuremen
ts (trigger synchronization enabled).
The commands to set the trigger level and trigger delay for pu
lse 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> Ch
arger Channel (#2)
<NRf> = 0 to 5 User trigger digitization delay in seconds (10µsec
steps).
For digitization, the internal trigger delay is
15μsec.
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> Ch
arger Channel (#2)
<name> = HIGH or AVER Sync up to rising edge of pulse for 1st reading of
digitizatio
n.
= LOW Sync up to falling edge of pulse for 1st reading of
digitizatio
n.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
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