Tektronix 2302, 2302-PJ, 2306, 2306-PJ User manual
Model 2302/2302-PJ/2306/2306-PJ
Keithley Instruments, Inc.
28775 Aurora Road
Cleveland, Ohio 44139
(440) 248-0400
Fax: (440) 248-6168
Battery/Charger Simulator
Packing List
F AST, SEARch, and DETect
This document provides information on Keithley’s Model 2302/2302-PJ/2306/2306-PJ Battery/Charger Simulators. FAST, SEARch, and DETect capabilities have been added for Pulse Current Measurements along
with a user set pulse current timeout. These features are available in Firmware Revision B05 and later (use
the REVISION NUMBER menu item located on the main menu to display the firmware revision). The new
pulse current F AST, SEARch, and DETect capabilities described in this addendum are bus only features (the
settings are ignored when operating the power supply in local mode — front panel) while the new variable
pulse current timeout feature can be accessed over the bus or from the front panel and used in local or remote
mode. This addendum provides information on using these new features.
New features
Front panel
The front panel can be used to set the new variable pulse current timeout feature. The menu item is located in
the PULSE CURRENT menu after the AUTO TIME menu item as shown in Table 2. Refer to "Using FAST,
SEARch, and DET ect" later in this addendum for detailed usage information on properly setting this TimeOUT
variable.
NOTE Pulse Current #1/#2, and Integration time settings (High, Low, Average, and Auto)
are contained in Table 1 for reference of the PULSE TIMEOUT menu item only —
no change to these menu items has occurred.
Table 1
Front panel menu item — Pulse Current Timeout
Menu item Description Reference
PULSE CURRENT #1/#2 Pulse current configuration. Section 3 of the 2302/
2306 Instruction Manual
HIGH TIME Set high time integration rate (in µsec.).
LOW TIME Set low time integration rate (in µsec.).
AVERAGE TIME Set average time integration rate (in µsec.).
AUTO TIME Set pulse integration rates automatically.
PULSE TIMEOUT Set pulse timeout (default is 1.000 seconds,
incremented in 1ms steps).
This document
PA-799 Rev. A / 6-01
Bus commands
Table 2 contains the new bus commands.
Table 2
New bus commands (Firmware B05 and later)
Commands Description Default
SENSe[1]
:PCURrent
:FAST
:SEARch
:DETect
:TimeOUT
SENSe2
:PCURrent
:FAST
:SEARch
:DETect
:TimeOUT
SENSe subsystem for Channel #1 (battery channel):
Pulse current configuration:
Enable or disable pulse current fast readings.
Enable or disable pulse current search.
Enable or disable pulse current detection mode.
Specify length of timeout: 5ms -1000ms (1 second) incrementing in 1ms.
SENSe subsystem for Channel #2 (charger channel):
Pulse current configuration:
Enable or disable pulse current fast readings.
Enable or disable pulse current search.
Enable or disable pulse current detection mode.
Specify length of timeout: 5ms -1000ms (1 second) incrementing in 1ms.
OFF
ON
OFF
1 (sec)
OFF
ON
OFF
1 (sec)
Command notes
SENSe[1]: PulseCURrent:FAST <b>
SENSe2: PulseCURrent:FAST <b>
Refer to "Using FAST, SEARch, and DETect" for detailed usage information.
SENSe[1]:PulseCURrent:SEARch <b>
SENSe2: PulseCURrent:SEARch <b>
Refer to "Using FAST, SEARch, and DETect" for detailed usage information.
SENSe[1]: PulseCURrent:DET ect <b>
SENSe2: PulseCURrent:DET ect <b>
Refer to "Using FAST, SEARch, and DETect" for detailed usage information.
SENSe[1]:PulseCURrent:TimeOUT <NRf>
SENSe2: PulseCURrent: TimeOUT <NRf>
Refer to "Using FAST, SEARch, and DETect" for detailed usage information
on properly setting the TimeOUT variable.
Applies to battery channel (#1)
Applies to charger channel (#2)
Applies to battery channel (#1)
Applies to charger channel (#2)
Applies to battery channel (#1)
Applies to charger channel (#2)
Applies to battery channel (#1)
Applies to charger channel (#2)
Using FAST, SEARch, and DET ect
Use FAST, SEARch, and DETect to control how background readings are taken. A background reading is a
measurement taken by the power supply between user triggered readings. The selected function dictates ho w
background readings are taken between user triggered readings.
For pulse current, a background reading inv olv es looking for the pulse and optionally generating a reading for
the user. The various settings of SEARch, FAST, and DETect allow the user to fine tune the function. This enables the function to perform the desired background readings (if any) between user triggered readings. The
default settings (FAST:OFF, SEARch:ON, and DETect:OFF) allow the pulse current background readings to
be taken. If no pulse is present, the setting of TimeOUT af fects ho w responsiv e the supply is to bus commands.
If a pulse is present, the search time affects how responsi ve the supply is to bus commands (refer to Figure 1).
T able 3 contains the available settings for F AST, SEARch, and DETect commands and a description of the resulting action.
In order to efficiently use FAST, SEARch, and DETect for pulse current measurements, the user must know
the approximate period of the expected pulse. TOUT (TimeOUT) specifies the timeout length for searching
for the pulse (default setting is 1 second). When the T OUT value is reached, NO PULSE is displayed (top line
of the front panel display) if default settings for FAST, SEARch, and DETect are used. See Table 3 for what
is displayed on the front panel display if the default settings are not used. Set the value for T OUT as follows:
TOUT = Search Time + Period
Search Time = time allowed for detection of a pulse edge
Period = time between consecutive pulse edges
The timeout value should be set to allow sufficient time for detection of the pulse if the edge is just missed. In
Figure 1, (P) is the point where to start looking for the pulse. Since the rising edge was just missed, (D) will be
the first detectable rising edge. If the timeout is less than the search time, a pulse trigger timeout (due to TOUT)
may occur. Therefore, if the period = 0.4 seconds, a good T OUT v alue w ould be 0.5 seconds. A similar method
for selecting a TOUT value w ould be to use a value equal to 105% of the expected pulse period.
Figure 1
PCURent and SEARch time for pulse high measurement
Period
P
Search T ime
TOUT setting must account for Search Time and Period.
= Search for Pulse High edge started
P
= Reading time taken
R
= Detected pulse edge (Rising for pulse high measurements)
D
Search Time: Measured from when unit starts looking for the pulse until
the first detectable desired edge. This is a rising edge for HIGH and
AVG measurements and the falling edge for LOW measurements.
Period: Time between consecutive pulse edges.
D
R
TOUT
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