Brochure

:TRIG:SAMP:COUN 1
Set the sample count to 1 to take a single
measurement during the pulse. If the pulse
being measured is long enough, you can set this
to a larger number to take more measurements
per pulse.
:DEL:STAT ON
:DELay 60e-6
Turn the source delay on and set the delay value
long enough to place the measurement at the
top of the current pulse. For this DUT, the delay
is set to 60µs.
:DATA:CLEAR Clear the buffer.
:VOLT 1.8
Set the proper output voltage, 1.8V, for
the device.
:CUR R 0.1 Set the current limit ,0.1A, to protect the device.
:OUTP ON Turn the output on
:INIT
Initiate the trigger model to get it ready for the
trigger and take the measurement.
*OPC?
This will return “1” after all measurements
are complete.
:TRAC:DATA? “READ”
Read back the measurement data from
the buffer.
Test Results
Figure 3 is a screen shot from the Tektronix MDO4104B Mixed
Domain Oscilloscope. The purple waveform at the top is the load
current waveform from the DUT. The yellow waveform is the
Sleep/Transmit Trigger signal. The blue waveform is the Meter
Complete out signal from the instrument, indicating that the
instrument is ready for another trigger. The bottom half of the
screen is the RF spectrum generated during one of the wireless
transceiver’s transmissions.
Figure 3. Test system signals and device RF spectrum during transmission
captured with a Tektronix MDO4104B-6 Mixed Domain Oscilloscope
Table 1 lists the current readings from the precision
measurement power supply.
Table 1.
Sample Current (A)
0 14.552E-3
1 14.854E-3
2 15.189E-3
3 15.156E-3
4 14.955E-3
5 14.921E-3
6 14.921E-3
7 15.022E-3
8 15.055E-3
9 15.022E-3
Average 14.965E-3
These readings were taken from 10 separate current pulses
during which the same data was transmitted each time. Note the
high precision with which the current can be measured, with up
to 6½ digits of resolution. Averaging can be used for even greater
precision. The Series 2280S’s built-in measurement capabilities
greatly simplify test system design by eliminating the need for
additional instrumentation.
With Series 2280S Precision Measurement Power Supplies,
design and test engineers can make reliable, high quality
measurements on narrow load current pulse waveforms,
allowing them to characterize and verify device power
consumption so that their portable devices’ battery operating
life targets can be achieved.