Front Panel Operation
3-103
Note that only DC volts, and 2- and 4-wire ohms func-
tions are available for ratio and delta modes.
2. Use the cursor keys to select the desired function, then
press ENTER.
3. Press EXIT as necessary to return to normal display.
Step 5: Display ratio readings
Once the reference channel, measurement channel, and ratio
function have been defined, press SCAN to halt triggers, then
press TRIG or SCAN to display ratio readings. The instru-
ment will automatically display ratio readings computed
from signals applied to the reference and measurement chan-
nels. If you have selected a trigger mode that requires a sep-
arate trigger for each reading, you will, of course, have to
trigger the instrument to obtain each ratio reading (refer to
paragraph 3.7 for details on triggering).
Step 6: Disabling and cancelling the ratio mode
You can disable the ratio mode by pressing EXIT while ratio
readings are being displayed. To cancel the ratio mode, press
CONFIG-SCAN, then select another option under the
SCAN-OPERATION menu.
RTD temperature measurements
The following paragraphs outline the basic procedures for
making RTD temperature measurements using the internal
scanner. For more detailed information on temperature mea-
surements in general, refer to paragraph 3.4.5.
Step 1: Connect RTD probes
Connect RTD probes to the scanner using the basic resis-
tance connections outlined in the scanner card manual. For
4-wire probes, pair the connections as follows:
• Channels 1 and 6: probe #1
• Channels 2 and 7: probe #2
• Channels 3 and 8: probe #3
• Channels 4 and 9: probe #4
• Channels 5 and 10: probe #5
Step 2: Select sensor type and units
Use CONFIG-TEMP to select the RTD sensor type and the
units you wish to display. See paragraph 3.4.5 for details.
Step 3: Configure channels
1. Press CONFIG-CHAN. The instrument will display the
following:
CONFIGURE CHANNELS
INTERNAL-CHANS EXTERNAL-INPUTS
SAVE-ALT-FCN RESTORE-ALT-FCN
2. Select INTERNAL-CHANS. The Model 2001 will dis-
play the following:
SET INTERNAL CHANNELS
1=DCV 2=DCV 3=DCV 4=DCV 5=DCV
6=DCV 7=DCV 8=DCV 9=DCV 10=DCV
3. Use the cursor and range keys to select channels and
functions. Set the function type to TMP for all channels
connected to RTD probes. Select --- (none) for channels
without probes connected.
4. Press ENTER to return to normal display.
Step 4: Configure scan
1. From normal display, press CONFIG-SCAN. The in-
strument will display the following:
SCAN OPERATION
INTERNAL EXTERNAL RATIO DELTA
2. Select INTERNAL, then press ENTER.
Step 5: Scan channels
To start scanning, press the SCAN key and program the scan
count, scan timer, and data storage. Then press ENTER.
When the scan has completed, you can recall stored data and/
or scan again. Press EXIT while scanning to interrupt data
storage and disable scanning.
Using the scanner with the data storage buffer
The Model 2001 internal data storage buffer can be used to
store readings taken while using the scanner. The following
paragraphs outline the basic steps necessary for data storage
of scanner readings. Refer to paragraph 3.8 for additional in-
formation on using the data storage buffer.
Step 1: Configure channels
1. Press CONFIG-CHAN. The instrument will display the
following:
CONFIGURE CHANNELS
INTERNAL-CHANS EXTERNAL-INPUTS
SAVE-ALT-FCN RESTORE-ALT-FCN
2. Select INTERNAL-CHANS. The Model 2001 will dis-
play the following:
SET INTERNAL CHANNELS
1=DCV 2=DCV 3=DCV 4=DCV 5=DCV
6=DCV 7=DCV 8=DCV 9=DCV 10=DCV
3. Use the cursor and range keys to select channels and
functions, then press ENTER when you have set all
functions and channels.
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