Section 2: General operation
Model 2657A High Power System SourceMeter® Instrument Reference Manual
2-30
2657A-901-01 Rev. B/December 2012
To manually configure the settings, refer to the applicable topics:
•
V-meter and I-meter measurements
(on page 2-30)
•
(on page 2-30)
•
V-meter and I-meter measurements
To make V-meter and I-meter measurements without using the MODE key (such as when configuring
measure-only tests over the remote interface), follow the procedure below.
Perform the following steps to use the Model 2657A to measure voltage or current:
1. Select source-measure functions.
V-meter (voltmeter):
Press the
SRC
key to select the I-source, and press the
MEAS
key to
select the voltage measurement function.
I-meter (ammeter):
Press the
SRC
key to select the V-source, and press the
MEAS
key to select
the current measurement function.
2. Set source and compliance levels. To edit the source level, use the procedure provided in
Select and set the source level
(on page 2-24); to edit the compliance level, use the procedure
provided in
Step 2: Set the compliance limit
(on page 2-24):
a. Select the lowest source range and set the source level to zero.
b. Set compliance to a level that is higher than the expected measurement.
When using the Model 2657A as a voltmeter, the voltage compliance limit must be set higher than the
voltage that is being measured. Failure to do this could result in excessive current flow into the Model
2657A, incorrect measurements, and possible damage to the instrument.
3. Use
the
RANGE
keys to select a fixed measurement range that will accommodate the expected
reading. Use the lowest possible range for best accuracy. You can also select autorange, which
will automatically set the Model 2657A to the most sensitive range.
4. Connect the voltage or current to be measured. Make sure to use 2-wire connections from the
Model 2657A to the device under test (DUT) (see
(on page 2-41)).
5. Press
the
OUTPUT ON/OFF
control to turn the output on.
6. View the displayed reading (press the
TRIG
key if necessary).
7. When finished, press the
OUTPUT ON/OFF
control to turn the output off.
Ohms measurements
Ohms calculations
Resistance readings are calculated from the measured current and measured voltage as follows:
R = V/I
Where:
R
is the calculated resistance
V
is the measured voltage
I
is the measured current
CAUTION
Summary of Contents for 2657A
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