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Keithley 2001 Manual

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Front Panel Operation
2001-900-01 Rev. K/ August 2010 3-5
• The top line can display readings up to 7H digits, along
with units. It can also indicate the measurement type
(e.g., RMS), display “hold”, type of math operation,
channel number, or limits pass/fail. It is also used for
menu headings, values of stored readings, and
messages.
• The bottom line displays the range and other measure-
ment parameters (e.g., coupling or ratio), multiple dis-
plays, menu items, parameters of stored readings, and
messages. For longer text strings, the bottom line is
split in half. These are indicated by and charac-
ters at the left or right end of the bottom line. Press the
cursor keys ( and ) to view each half.
Scientific notation
Enabling a relative or math operation might cause the
reading value to exceed the display resolution of the top line.
In these cases, the instrument displays in 7H digits of
scientific notation. If the units have a multiplier prefix (milli-
, micro-, etc.), the exponent of the value reflects that. Labels
on the far right, such as channel number, may be sacrificed
to provide the desired precision. Note that ratio
measurements are always shown in 7H digit scientific
notation with no prefix or channel number.
The actual value of the reading, before the relative or math
operation, can be viewed on the bottom line with the
appropriate multiple display. (See Figure 3-1). The units and
multiplier prefix on the bottom line are assumed to be the
same as those on the top line reading.
Annunciators
The annunciators at the top of the display indicate the
following conditions:
ERR: The displayed reading is questionable. See paragraph
4.21 for the conditions that define a questionable reading.
REM: Indicates the Model 2001 is in remote when used over
the IEEE-488 bus. The Model 2001 can be placed in remote
by addressing it to listen with the bus REN line true.
TALK: Shows that the Model 2001 is the active talker on the
IEEE-488 bus. The unit can be placed in the talker active
state by sending it the correct bus talk command, which is
derived from the primary address.
LSTN: Turns on when the unit is an active IEEE-488 bus
listener. The Model 2001 can be placed in the active listener
state by addressing it to listen.
SRQ: Turns on when the unit requests service over the IEEE-
488 bus. The SCPI STATus command allows you to control
which conditions generate an SRQ (see paragraph 4.21).
REAR: Turns on when a reading has been acquired through
the rear inputs.
REL: Turns on/off to indicate the present state of the relative
reading feature.
FILT: When filtering has been selected for a particular
function, this indicator turns on when the FILTER key is
pressed. For those functions with auto-filtering, it turns on
when AUTO is selected.
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Model 2001 display formats
Reading and Units
Type of
Measurement
+002.056 mVAC RMS
Range: 200 mVAC Coupling: AC
Range and other measurement parameters
Stored Reading
External
Channel
-10.38649 VDC CH20
Rdg#+00099 @Time = +003.286492 sec
Stored reading parameter
Menu Heading
CONFIG TEMPERATURE
Sensor Units Speed Filter Resln
Menu Items
Reading after calculation
+2.0582673 e + 08mVAC
Reading = 002.058673
Reading before calculation
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Scientific notation with calculate multiple display
… 37 …


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