To measure a closed loop response
When it is not possible to make a direct open loop measurement you can make a
closed loop response by breaking into the circuit under test and inserting and
monitoring the test signals. This task makes a closed loop Y/S measurement in the
Swept Sine instrument mode, Option 1D2.
1 Initialize the analyzer.
Press [
Preset
][
DO PRESET
].
Press [
Inst Mode
][
SWEPT SINE
].
Press [
Meas Data
][
FREQ RESP 2/1
].
2 Connect the device-under-test (DUT) as shown in the illustration below.
3 Specify the measurement parameters.
Press [
Freq
][
START
] <number> <unit>, then press [
STOP
] <number> <unit>.
Press [
RESOLUTN SETUP
], then press [
AUTO RES ON OFF
] to highlight ON.
Press [
Input
][
CH1 AUTO RANGE
].
Press [
CHANNEL 1 2 3 4
] to highlight 2, then press [
CH2 AUTO RANGE
].
Press [
Source
][
LEVEL
] <number> <unit>.
Agilent 35670A
Measuring Control Systems Operator's Guide
5-18