Dc And Ac Voltage - Keithley 2001 Operator's Manual

3.4.1

DC and AC voltage

DC voltage measurements
The Model 2001 can make DC voltage measurements
between 10nV and 1100V. Assuming "bench reset"
conditions (see paragraph
follows:
1. Connect the test leads to the INPUT HI and LO termi-
nals of the Model 2001. Either the front or rear inputs
can be used; place the INPUTS button in the appropriate
position.
2. Select the DCV function.
3. Select a range consistent with the expected voltage. For
automatic range selection, press the AUTO key. The
AUTO annunciator denotes whether auto-ranging is en-
abled.
4. Connect the test leads to the source as shown in
3-6.
CAUTION
Do not exceed 1100V peak between IN-
PUT HI and LO, or instrument damage
may occur.
5. Observe the display. If the "Overflow" message is
shown, select a higher range until a normal reading is
displayed. Always use the lowest possible range for the
best resolution.
6. Take a reading from the display.
Zeroing
The term "when properly zeroed" means that you must
establish a baseline for subsequent measurements on that
range. The 200mV DC range requires zero to be set to
achieve rated accuracy. This procedure should be performed
whenever the ambient temperature changes. To zero (rel) the
Model 2001, use the following procedure:
1. Disable rel, if presently enabled, by pressing the REL
key. The REL annunciator will turn off.
2. Select the 200mVDC range.
3. Connect the test leads to INPUT HI and LO of the Mod-
el 2001 and short them together. Noise and thermal off-
sets may require a few moments to stabilize.
4. Press the REL key. The display will read zero.
5. Remove the short and connect the test leads to the signal
to be measured.
2001-900-01 Rev. K/ August 2010
3.12.1), the basic procedure is as
Also, use shielded, low-thermal connections for the 200mV
range to avoid errors caused by noise or thermal offsets.
Connect the shield to the negative source terminal.
AC voltage measurements
The Model 2001 can make true RMS AC voltage
measurements between 100nV and 775V. Assuming "bench
reset" conditions (see
procedure is as follows:
1. Connect the test leads to the INPUT HI and LO termi-
nals of the Model 2001.
2. Select the ACV function.
3. Select a range consistent with the expected voltage. For
automatic range selection, press the AUTO key. The
AUTO annunciator denotes whether autoranging is en-
abled.
Figure
4. Connect the test leads to the source as shown in
3-7.
Do not apply more than 1100V peak be-
tween
210
age may occur.
5. Observe the display. If the "Overflow" message is
shown, select a higher range until a normal reading is
displayed. Always use the lowest possible range for the
best resolution.
6. Take a reading from the display.
Voltage configuration
The following paragraphs detail how to change the Model
2001 from its bench reset conditions for DC and AC voltage
measurements. The configuration menus are summarized in
Table 3-6 and
to be selected in order to be configured. When the function
is selected, it will assume the programmed status.
Front Panel Operation
paragraph 3.12.1), the basic
CAUTION
INPUT HI and
7
V•Hz input, or instrument dam-
Table 3-7. Note that a function does not have
Figure
LO, or
3-13