Start Stepping Or Scanning; Temperature Measurements - Keithley 2001-TCSCAN Instruction Manual

Operation
OPEN and CLOSE keys — These keys also control channels
on the internal scanner card. The keys let you directly:
• Close a specific channel (or channel pair for 4-wire
configuration).
• Immediately open any closed channel (or channel pair
for 4-wire configuration).
With a scanner card installed in the option slot, the following
prompt is displayed when the close key is pressed:
CLOSE CHAN:01
Use the , , , and
nel (1 to 10) and press ENTER. The annunciator of the
closed channel will be displayed on the front panel along
with normal readings. Selecting a different channel from the
one presently closed will cause the closed channel to open
and allow a settling time before closing the selected channel.
Remember that channel 1 is the reference junction.
Channel relays will be closed according to the presently se-
lected function. If a 4-wire function is selected, both the se-
lected channel relay and the matching pair relay will be
closed. Valid 4-pole channel pairs are:
• 2 and 7
• 3 and 8
• 4 and 9
• 5 and 10
CAUTION
Do not use channel pair 1 and 6. Chan-
nel 1 is the temperature reference junc-
tion. Applying a signal to channel 6
could damage the reference junction.
Pressing OPEN will immediately open any closed scanner
card channel or channel pair for a 4-wire function.
3-20
keys to display the desired chan-
3.9.3

Start stepping or scanning

The STEP key is used to start the stepping process. When
STEPping, an output trigger is sent after each channel is
closed. Stepping will stop after the last reading count (RDG
CNT) channel closes.
The SCAN key is used to start the scanning process. When
SCANning, an output trigger is sent at the end of the scan
list. Thus, if 3 scans are performed, 3 output triggers will oc-
cur. The specified reading count (RDG CNT) determines the
number of scans performed. The instrument will perform
enough scans to accommodate the specified reading count
(RDG CNT). Scanning will stop after the last scan list chan-
nel (of the last scan) closes.
When finished, press SHIFT and then
HALT to exit from the STEP/SCAN
mode.

3.10 Temperature measurements

The following paragraphs explain how to make temperature
measurements from the front panel using the Model 2001-
TCSCAN installed in the Model 2000/2010. Measurements
can be made by either automatic stepping/scanning or by
manually closing specific channels. Sensors that can be used
for temperature measurements include:
• Model 2000: Thermocouples types - J, K, or T
• Model 2010: Thermocouple types - J, K, T, or N
RTD types - PT100, USER, PT3916,
PT385, F100, or D100
The Model 2000 can only use thermocou-
ples to make temperature measurements.
NOTE
NOTE