2
Operating Your Instrument
118
Keysight 53147A/148A/149A Operating and Programming Guide
Frequency Modulation
(FM)
The Counter can measure signals that are modulated in frequency, such as a
microwave radio carrier. When
FM
is set to
AUTO
(the default setting), the
Counter automatically detects FM signals and modifies its measurement
algorithm accordingly. Since this increases the time it takes to compute each
measurement, you can turn this feature
OFF
to increase measurement speed, or
leave it set to AUTO to increase accuracy when measuring FM signals.
RS-232 Serial Port Data Rate
(BAUD)
The Baud rate for the RS-232 serial port is configurable at 1200, 2400, 4800,
9600, 14,400, and 19,200 bps. The default setting is 9600 bps.
Preset
When
PRESET
is displayed, pressing the
Enter
key loads the default settings for
most of the instrument’s functions. These functions and their default settings are
listed in the following table:
Table 2-3
Factory Default Function Settings
Function
Available Settings
Default Setting
Reference Oscillator (REF OSC)
INT (Internal), EXT (External)
INT (Internal)
Power Reference Signal (PWR REF)
OFF, ON
OFF
Save Settings (SAVE)
0 through 8
0
Recall Settings (RECALL)
0 through 8
0
Channel 1 Low-Pass Filter (CH1 LPF)
OFF, ON
OFF
Frequency Modulation (FM)
AUTO, OFF
AUTO
Serial Port Data Rate (BAUD)
1200, 2400, 4800, 9600, 14400, 19200 9600
Power Meter Head Model (HEAD)
OFF, 8487A, 8485A, 8482A, 8481D,
8481A, CUSTOM 1, CUSTOM 2,
CUSTOM 3
OFF
GPIB Address (GPIB)
0-30
19
Resolution (
Resol
key)
1 Hz, 10 Hz, 100 Hz; 1kHz, 10 kHz,
100 kHz, 1 MHz
1 Hz
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