How to make a sampling measurement with pulsed source

Agilent B2901/02/11/12A Precision Source/Measure Unit
How to make a sampling measurement with pulsed source
This material shows how to perform a sampling measurement through an example of sourcing the pulsed current to LED
and measuring the voltage.
Figure 1 illustrates the connection and condition supposed in the example of measuring LED using the B2901/02/11/12A.
B2901/02/11/12A
A
V
High Force
DUT
-
Low Force
Figure 1. Connection and condition supposed in the example
Figure 2 shows the timing chart for the sampling measurement with pulsed source with the front panel operation. In this
case, the specified source value is sourced immediately after turning on
. Then, when you press
, the
instrument will make a sampling measurement. Pulse parameters will be used in the example in order to source the
pulsed current. Besides, if it is necessary, you can specify any measurement trigger delay time which is the wait time after
each internal trigger and before making a measurement. If you configure the pulsed source, the measurement will be
made with FIXED measurement range operation automatically. The measurement range is selected by Limit value. The
measurement time consists of Measurement Speed and some overhead time. Measurement Speed is the parameter
specified by the user. Overhead time includes the time to change the measurement range, etc.
TP
V or I
TP
TP
TP
TP
TMD
TMD
TP
TP
TMD
Pulse Peak
Value
TMD
TMD
Source
Value
TM
Output
Off State
TM
TMD
TM
TPD
Trigger
Output ON
TM
Internal Trigger
TM
TMD
TM
TPW
TM
:Measurement
Time
TPD : Pulse Delay TMD : Measurement Trigger Delay Time
TPW : Pulse Width TP : Trigger Period
TM : Measurement Time
Figure 2. Timing chart for the sampling measurement with pulsed source
Agilent B2901/02/11/12A Precision Source/Measure Unit
Performing a sampling measurement
Step 1.
Press
Step 2. Press
source.
repeatedly until Single View for Channel 1 is shown in the display.
to edit the source function, and then select
(1) Press Mode
Step 3.
Press
Press
(2) Press AMPS (I)
to edit the source value, and then enter 10 nA to set the source value to 10 nA.
(1) Press Source
Step 4.
to set the source function to the current
(2) Enter Source Value
to edit the limit value, and then enter 2 V to set the limit value to 2 V.
(1) Press Limit
(2) Enter Limit Value
Step 5. Press
to configure the measurement parameter, and then select
parameter to the voltage.
(1) Press Measure
(2) Press VOLTS (V)
to set the measurement
Agilent B2901/02/11/12A Precision Source/Measure Unit
Step 6.
Press
to change the keys shown in Assist keys, and then press
(1) Press Show Pulse
Step 7.
Press
, then press
(2) Pulse Sub-Panel appears
to set the pulse source ON. After turning on the pulse source, you can
see Source Shape which shows the pulse source mode.
(1) Press ON
Step 8.
Rotate
Source Shape
to select Channel 1 Pulse Parameters and set them up as below.
(Peak: 10 mA, Delay: 20 ms, Width: 60 ms)
to show Pulse Sub-Panel.
Agilent B2901/02/11/12A Precision Source/Measure Unit
Step 9.
Press
to show Trigger Sub-Panel.
(1) Press Show Trigger
Step 10. Press
to edit the trigger type, and then select
(1) Press
Step 11. Rotate
(2) Trigger Sub-Panel appears
to set the trigger type to TIMER.
(2) Press TIMER
to select Channel 1 Trigger Parameters and set them up as below. Measurement Trigger
Count defines the number of sampling and Measurement Trigger Period defines the interval of sampling.
(Source Trigger Count: 1, Measurement Trigger Count: 101, Measurement Trigger Delay Time: 500 us,
Measurement Trigger Period: 1 ms)
Now you’ve configured 1 ms measurement trigger period for a sampling measurement. The measurement will be
performed every 1 ms periodically. However, please note that FIXED current measurement range operation will be used to
control the trigger period strictly. The measurement range is selected by Limit value. In this example, 2 V measurement
range will be used.
Agilent B2901/02/11/12A Precision Source/Measure Unit
Step 12. Press
repeatedly until Graph View is shown in the display.
Step 13. Rotate and press
to edit the Y-axis data type, and then select
to set the Y-axis data type to
the voltage.
(1) Rotate and press
Y-axis Data Type field
Step 14. Rotate and press
(1) Rotate
Type field
Step 15. Press
to select
(2) Press VOLTS (V)
to edit the X-axis data type
to select X-axis Data
, and then select
(1) Press More …
(2) Press
Type
to select X-axis Data
to set the X-axis data type to the time.
(2) Press TIME (t)
Step 16. Press
to source the current, and then press
(The status information will show
during the measurement.)
to perform a measurement.
Agilent B2901/02/11/12A Precision Source/Measure Unit
Step 17. Press
to adjust the scale of the graph after finishing the measurement.
Step 18. Rotate and press
(1) Rotate and press
Y-axis scaling
to edit the Y-axis scaling, and then enter 2 V to adjust the graph scale.
to select
(2) Enter the scale such as 2 V
Now you can see the measurement result on the GUI of the B2901/02/11/12A as bellow.
Agilent B2901/02/11/12A Precision Source/Measure Unit
Configuring the measurement speed
In the default setting, the instrument selects the appropriate measurement speed automatically to get the fine accuracy.
However, you can also specify it on the GUI of the B2901/02/11/12A to meet a variety of the requirement to the
measurement conditions.
For example, let’s try to change the measurement speed to SHORT to make a measurement more quickly. If you select
SHORT, the aperture time is set to 0.01 PLC. Here, PLC stands for power line cycle and the specified number of power line
cycles is used per a measurement.
Step 1.
Press
Step 2.
Press
repeatedly until Single View for Channel 1 is shown in the display.
to edit the measurement speed, and then select
SHORT. (If you can’t see
in Assist keys, press
(1) Press Speed
to set the measurement speed to
to change the keys shown in Assist keys.)
(2) Press SHORT
Viewing the list of measurement results
The measurement results including the measurement time stamp can be referred by the following steps.
Step 1.
Step 2.
If you aren’t on the top of the Function menu, press
repeatedly to return to the top level.
On the top level of the Function menu
Any tree structure can’t be seen
In the middle level of the Function menu
Some tree structure can be seen
If you’d like to see the list of the measurement result, press
, then press
Measure Result dialogue.
(1) Press Result
(2) Press Measure
to open
Agilent B2901/02/11/12A Precision Source/Measure Unit
Step 3.
Rotate and press
(1) Rotate
field
Step 4. Press
type.
to select Data Type field.
to select Data Type
To select Data Type
to change the keys shown in Assist keys, and then press
(1) Press More …
Step 5.
(2) Press
Rotate and press
(1) Rotate and press
Data field
to select Time as the data
(2) Press TIME (t)
to select Data field. Then rotate
to select
to scroll the data list.
(2) Rotate
or press Assist key
to scroll the list