Signal Limitations; Scanner Card Detection; Power-Up Detection; Scanner Option Bus Query - Keithley 2001-TCSCAN Instruction Manual

Operation
3.2

Signal limitations

CAUTION
To prevent damage to the Model 2001-
TCSCAN, do not exceed the maximum
signal level specifications of the card.
To prevent over-heating or damage to the relays, never
exceed the following maximum input signal levels:
DC signals: 110V DC, 1A switched, 30VA (resistive load).
AC signals: 125V rms or 175V AC peak, 1A switched,
62.5VA (resistive load). (Channels 5 and 10 maximum
power = 0.25VA due to factory installed current-limiting
resistors. See paragraph 4.8 for modification.)
3.3

Scanner card detection

3.3.1

Power-up detection

The scanner card is detected only at power-on. If the card is
plugged into the DMM after the power is turned on, the card
will not be recognized as being present by the DMM.
CAUTION
Plugging in the scanner card with pow-
er turned on may result in damage to
both the Model 2001-TCSCAN and the
DMM.
If the card is not present at power-on, scanner bus commands
or queries will generate a "Missing hardware error", and
front panel operations pertaining to the scanner will inform
you that no scanner is present.
3.3.2

Scanner option bus query

*OPT? is an IEEE 488.2 common query which will allow
you determine whether or not the Model 2001-TCSCAN
card is installed. The response to this query has two fields.
The first field identifies the presence or absence of expansion
memory, and the second field indicates whether or not the
scanner is present as follows:
• 0: Scanner not installed.
• 2001-SCAN: Model 2001-TCSCAN scanner card installed.
3-2
Refer to the individual DMM operator's manual for more
details on using the *OPT? query.
3.4

Front panel scanner controls

Use paragraphs 3.4 through 3.8 for scan-
ner card operation using the Models 2001
and 2002 DMMs. Models 2000 and 2010
DMM operation is covered in paragraphs
1
3.9 through 3.11.
The following paragraphs give an overview of the various
Model 2001 Multimeter controls used with the scanner.
Figure 3-1 shows the front panel of the Models 2001 and
2002. Controls that affect Model 2001-TCSCAN operation
include:
• CHAN: Allows you to open and close channels directly.
• CONFIG-CHAN: Defines the measurement functions
for each scanner channel.
• CONFIG-SCAN: Selects internal/external scan list.
• SCAN: Enters scan configuration menu.
• and : Manually scans through channels.
• TEMP: Enables temperature measurements.
• CONFIG-TEMP: Selects sensor type, thermocouple
type, and reference junctions.
3.4.1

Open and close channels (CHAN)

The CHAN key allows you directly:
• Open any closed channel(s) immediately.
• Close a specific channel (or channel pair for 4-wire
functions).
Pressing CHAN will display the following menu choices:
CHANNEL SELECTION
CLOSE-CHANNEL OPEN-ALL-CHANNELS
NOTE