Figure 3-1 Model 2001 Display Formats - Keithley 2001 Operator's Manual

Reading and Units
+002.056 mVAC
Range: 200 mVAC
Range and other measurement parameters
Stored Reading
-10.38649 VDC
Rdg#+00099 @Time = +003.286492 sec
Stored reading parameter
Menu Heading
CONFIG TEMPERATURE
Sensor Units Speed Filter Resln
Menu Items
Figure 3-1
Model 2001 display formats
• The top line can display readings up to 7
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
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 read-
ing value to exceed the display resolution of the top line. In
these cases, the instrument displays in 7
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 al-
ways shown in 7 digit scientific notation with no prefix or
channel number.
Type of
Measurement
RMS
Coupling: AC
External
Channel
CH20
digits, along
and characters at
digits of scientific
The actual value of the reading, before the relative or math
operation, can be viewed on the bottom line with the appro-
priate multiple display. (See Figure 3-2). The units and mul-
tiplier prefix on the bottom line are assumed to be the same
as those on the top line reading.
Reading after calculation
+2.0582673 e + 08mVAC
Reading = 002.058673
Reading before calculation
Figure 3-2
Scientific notation with calculate multiple display
Annunciators
The annunciators at the top of the display indicate the fol-
lowing 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 lis-
tener. 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 func-
tion, this indicator turns on when the FILTER key is pressed.
For those functions with auto-filtering, it turns on when
AUTO is selected.
Front Panel Operation
3-5