Palstar ZM-30, Owner'S Manual

Page: 13 / 37

13
used to compute the inductance is:
XL = 2 * pi * F * L
When the frequency and/or inductance is
beyond the instrument’s capabilities,
producing a value for XL greater than 600
ohms, the display will indicate as shown
below.
10,000.00
L = (Z>1K)
' / $
The VFO mode may be entered at any time
by pressing the dial pushbutton when VFO
is displayed. Upon entry to the VFO mode,
you will see the following typical display:
10,000.00
VFO
The top line indicates the frequency of the
continuous signal available on the output
connector.
The feature that makes the VFO mode
valuable is the constant signal being
generated the selected frequency. The
impedance mode uses a technique of
frequency shifting at ½-second intervals in
order to determine the sign of the reactance
component. This frequency shifting makes
the signal unusable for purposes other than
impedance measurement. When the signal
is to be used as an external VFO, local
oscillator or test signal, it is desirable to
have a steady and constant-frequency signal,
and the VFO mode provides just this.
,4@ *
Pressing the SETUP pushbutton presents a
menu of functions to allow setting of
configurable options in the instrument.
Rotate the dial to display the desired
function, then press the dial to select that
function.
Set Scan Step Size
This function allows the user to select the
step size to be used for the Scan operation.
Available step sizes are 100 kHz, 10 kHz, 1
kHz (default), and 100 Hz.
Enable Tones
This function provides an audible tone
whose pitch corresponds to the SWR being
measured when in Impedance mode. This
feature is useful in eyes-free conditions or
by the visually-impaired. Tone varies with
changes in SWR again, even when the dial
is not being moved. (Facilitates changing
antenna while listening to lower SWR.)
Disable Tones
This function disables the audible tone.
(Default setting.)
Turn Lite On
This function turns on the display backlight.
After a user-settable amount of instrument
inactivity, the backlight will turn off. When
the user touches any of the controls again,
the display backlight will again turn on.
Turn Lite Off
This function turns off the display backlight.
(Default setting.)
Lite Off Time
This function prompts the user to enter the
number of minutes of inactivity before the
display backlight is automatically turned off.
(Default value is 10 minutes)
Power Off Time
This function prompts the user to enter the
number of minutes of inactivity before the
entire instrument is automatically turned off.
When the user touches any of the controls
again, the timeout counter is reset to this
user-entered value. (Default value is 10
minutes.)
Battery Voltage
Select this function to display the
approximate voltage of the battery.
Default Settings
This function restore the default settings of
all data stored in nonvolatile EEPROM
memory.
View Settings
This function sequences through a display of
all settings stored in nonvolatile EEPROM
memory when the dial is turned.