NF FRA5014, Instruction Manual

Page: 42 / 107

3.5 Basic Operations
FRA5014 3-12
3.5.2 Spot measurements
With spot measurements, one specified frequency point is measured, then its gain and phase are
measured for channel pairs CH2 & CH1, CH3 & CH1 and CH4 & CH1. Also, spot measurement
enables measurement result data to be read in complex formats.
The main spot measurement settings are listed below.
•
AC amplitude
•
DC bias
•
Measurement frequency
•
Measurement delay time
•
Integration time
•
Integration cycle
Setting example
*RST

Initializes
VOLT 1

Sets AC amplitude as 1 Vrms
VOLT:OFFS 0

Sets DC offset as 0 V
FREQ 10 kHz

Sets measurement frequency as 10 kHz
MEAS:DEL 0

Sets time between changing oscillation frequency and starting
measurement as 0 seconds
MEAS:INT:TIME 0.1

Sets integration time as 0.1 second
MEAS:INT:CYC 10

Sets integration cycles as 10 cycles
(The actual integration time (cycle) is the larger between the set integration time and the
integration cycle, and is set as an integer cycle period.)
VOLT:OUTP 2

Sets oscillator output as on
Measurement example
SWE:MEAS SPOT

Runs the spot measurement
SENS:DATA:SPOT?

Reads measurement data
(The MEASURE lamp is on during measurement. When the measurement is completed and
the MEASURE lamp goes off, read out the measurement data.)
After entering a remote command, set the unit to Talker.
For details, see “
5.4 Command Descriptions
”
3.5.3 Measurement values during overload input
When the input signal to any of the analyzer’s channels exceeds the measurement range (±10 V), the
measured gain value is shown as the
FRA5014
’s maximum display value. Specifically, the
following measurement values are set.
•
Gain (dB) +199.99 dB
•
Phase 0.00 deg
When overload input occurs in channel 1, the measurement values become as shown above. If
overload input occurs in channel 2, 3 or 4, the measurement values become as shown above only for
the channel with overload input.