Keithley 2001 Operator's Manual page 134

Front Panel Operation
2. Select INTERNAL-CHANS, then press ENTER. The
multimeter will display the following menu:
SET INTERNAL CHANS
1=DCV 2=DCV 3=DCV 4=DCV 5=DCV
6=DCV 7=DCV 8=DCV 9=DCV 10=DCV
3. Using the cursor keys, select the desired channel (press
the right cursor key to display channels 6 through 10).
4. Using the range keys, select the desired measurement
function: DCV, ACV, 2W, 4W, FRQ, TMP, ALT,
JN1, JN2, JN3, JN4, JN5, --- (None).
5. Repeat steps 3 and 4 for each of the channels you wish
to scan. Note: Select --- (none) to omit a channel from
the scan list.
6. Examine all ten channels to verify omitted channels and
paired (PRD) channels.
7. After selecting all measurement functions, press EN-
TER to return to normal display.
Step 2: Select internal scan list
Use CONFIG-SCAN to select the internal scan list as
follows:
1. Press CONFIG-SCAN. The Model 2001 will display
the following:
SCAN OPERATION
INTERNAL EXTERNAL RATIO DELTA
2. Select INTERNAL, then press ENTER.
Step 3: Start scan
After configuring channels and scan list, simply press the
SCAN key to begin scanning. The instrument will prompt
you to configure the scan count and scan timer, and to enable
data storage. Pressing the ENTER key will scan through
selected channels and make a measurement on each channel
using the previously selected measurement function for each
channel. When the scan has completed, you can recall stored
data and/or scan again. To disable scanning, press the EXIT
key.
Using ratio and delta
The Model 2001 can display the difference (DELTA) or
quotient (RATIO) between the signal on any two internal
scanner channels. The following paragraphs discuss ratio
and delta calculations and also give step-by-step procedures
for using ratio and delta.
When the instrument is first placed in the ratio or delta mode,
it will close the scanner reference channel and then wait for
a trigger. When the reading is triggered, the unit will make a
3-102
measurement on the reference channel, switch to the
measurement channel, and then take a second measurement.
After measuring the measurement channel, the unit will
compute and display the ratio or delta value, and switch back
to the reference channel to wait for the next trigger.
The steps below outline the basic procedure for making ratio
measurements. The procedure for delta measurements is
essentially the same, except that you would select DELTA in
the appropriate menu.
Step 1: Connect inputs
Input signals must be connected to the two channels you
intend to define as measurement and reference channels.
Step 2: Define measurement channel
1. From normal display, press CONFIG-SCAN. The in-
strument will display the following:
SCAN OPERATION
INTERNAL EXTERNAL RATIO DELTA
2. Select RATIO, then press ENTER. The Model 2001 will
display the following:
CONFIGURE RATIO
MEASURE REFERENCE FUNCTION
3. Select MEASURE, then press ENTER. The instrument
will display the following:
RATIO MEASURE CHAN
CH1 2 3 4 5 6 7 8 9 10
4. Using the cursor keys, select the channel you wish to de-
fine as the measure channel, then press ENTER.
Step 3: Define reference channel
1. From the CONFIGURE RATIO menu, select REFER-
ENCE, then press ENTER. The Model 2001 will dis-
play the following message:
RATIO REFERENCE CHAN
CH1 2 3 4 5 6 7 8 9 10
2. Using the cursor keys, select the channel to be defined
as the reference channel, then press ENTER.
Step 4: Select measurement function
1. From the CONFIGURE RATIO menu, select FUNC-
TION, then press ENTER. The instrument will display
the following:
SET RATIO FUNCTION
 
DCV 2 4
2001-900-01 Rev. K/ August 2010