Giga-tronics 8650A Series, Operation Manual

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Series 8650A Universal Power Meters
3-118 Manual 31470, Rev. E, April 2001
Retrieving a Configuration
The commands for recalling a configuration from a register are based on the RC function code:
Syntax : RC [r] EN
RC is the Recall function code.
[r] identifies the register in which the instrument’s prior configuration has been
saved and from which it is now to be retrieved. The value of [r] can be any number
from 0 through 20. A terminating suffix (EN) is required.
Examples : OUTPUT 713;RC3EN
! Recall the configuration that was saved in register 3
OUTPUT 713;RC0EN ! Recall the prior configuration (this command recovers
! from configuration errors)
3.19.16 Units
Logarithmic or linear measurement units are specified by simple commands consisting of the function
codes LG and LN.
Syntax: LG or LN
Examples: OUTPUT 713;LG ! set Log units (dB or dBm)
OUTPUT 713;LN ! set Linear units (Watts or %)
These commands affect all types of measurements, except for the fast measurement collection modes.
These modes always return measurement readings in dBm.
3.19.17 V
PROP PROP PROP PROP
F Feature
The V
PROP
F feature (Voltage Proportional to Frequency) provides a means of indicating to the 8650A
the approximate frequency of the signal that it is measuring, so that the appropriate cal factor can be
applied. The frequency is indicated by means of a variable voltage input. The 8650A reads the voltage
as an expression of frequency, and applies the proper cal factor from the table stored in the sensor
EEPROM (interpolating for frequencies that fall between the stored values).
In order for the 8650A to interpret the input voltage input correctly, it is necessary to specify the
starting point (that is, the frequency at zero volts) and the slope (the rate at which voltage increases
with frequency).
NOTE:
These commands must be preceded by CH [n] EN command.
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