Number 3168
A Tektronix Company
Application Note
Se­ries
Using the Dual Measurement Functionality and
Dual Measurement Display on the Keithley Model
2110 5½-Digit Dual-Display Digital Multimeter
The Keithley Model 2110 5½-Digit Dual-Display Digital
Multimeter (DMM) is equipped with dual measurement
functionality and a dual measurement LCD display to simplify
making measurements and enhance viewing capability for many
industrial and research applications. For example, engineers can
now examine motor performance by monitoring both the voltage
and the temperature simultaneously using the Model 2110.
The secondary measurement function can be easily
configured on the front panel by pressing SHIFT+ENTER to
enter 2ND submenu and using the or button to locate a
desired 2ND measurement.
For example, the AC voltage (primary) and the AC frequency
(secondary) measurement functions can be activated on the front
panel using the following steps:
-Set up the primary measurement
1. Press ACV.
-Set up the secondary measurement
Figure 1. Example of dual measurement display.
As shown in Figure 1, the Keithley Model 2110 display
consists of a primary display (upper row) and a secondary display
(lower row). The primary display has a larger font size and an
11-character field to accommodate principal measurement needs.
The secondary can display up to 16 characters in a smaller font
size. It is configurable to display the range of the primary display
measurement, buffer statistics, customized text, or a secondary
measurement, as shown in Figure 1.
The dual measurement feature allows a user to configure
the DMM for two different measurement functions. Figure 2
captures all the possible combinations available on the Model
2110. When enabled, the secondary measurement function is
denoted as 2ND on the front display. The two measurements are
taken sequentially and the results are displayed simultaneously.
2. Press SHIFT+ENTER.
3. Use
button to locate FREQ.
4. Press ENTER to select it.
-Configure the secondary measurement
5. Use
or
button to configure FREQ’s APERTURE
or RANGE settings.
6. For example, to change FREQ’s RANGE, press ENTER
to select the RANGE setting.
7. Use
or
button to select a RANGE number. For
example, 1VAC
8. Press ENTER to finish.
Figure 3. Example front panel operations.
Now the display should show the AC voltage reading in the
primary display and the frequency reading in the secondary
display. See Figure 4.
Figure 4. Dual display showing AC voltage and frequency.
Figure 2. Available 2ND Measurements.
You can set up a similar operation through the remote
interface. The 2ND measurement function follows the SCPI
(Standard Commands for Programmable Instruments)
command syntax:
[SENSe:]FUNCtion[1|2] “<function>”
where
[1|2] Designates the primary and secondary
function, respectively
<function>
Can be replaced by “VOLTage:DC”,
“VOLTage:AC”, “CURRent:DC“,
“CURRent:AC“, “FREQuency“,
“PERiod”, etc.
In addition to displaying the 2ND measurement, the
secondary display can also show math-related statistical
information such as average (arithmetic mean), minimum (MIN),
maximum (MAX), and count. These four data values are bundled
into a single function called Average. When the Average function
is enabled, the Model 2110 calculates the average, MIN, MAX,
and count values of all the readings performed since enabling
the function. These values are stored in a volatile memory and
displayed on the secondary display. The volatile memory clears
when the meter is turned off, the math function is turned off,
the average function is run again, or the remote interface is
reset. Figure 5 is a sample display showing the DC voltage in the
primary display and the average of previously read DC voltages
in the secondary display.
The combinations of primary and secondary functions must
follow the rules as indicated in Figure 2. You will receive SCPI
errors for forbidden combinations , and your program will
terminate.
The following SCPI command sequence mirrors the front
panel operation demonstrated earlier.
Figure 5. Dual display showing math function average.
1. SENS:FUNC1 “VOLT:AC”
2. SENS:FUNC2 “FREQ:VOLT”
3. SENS:FREQ:VOLT:RANG 1
As can be seen on line 3 of the above code, the source signal
range setting for the 2ND measurement is set in a similar method
as the primary functions.
The Keithley Model 2110 5½-Digit Dual-Display Digital
Multimeter features rich capabilities, high accuracy, and high
speed for a broad range of applications from production to
laboratory research. Combined with a value price, the Model
2110 is unbeatable in today’s digital multimeter market.
Specifications are subject to change without notice. All Keithley trademarks and trade names are the property of Keithley Instruments, Inc.
All other trademarks and trade names are the property of their respective companies.
A Tektronix Company
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© Copyright 2012 Keithley Instruments, Inc.
Printed in the U.S.A
No. 3168
9.5.12