Operating Manual for COMMUNICATIONS SERVICE MONITOR

LOCAL OPERATION
Setup page 2
This page allows the following optional settings to be selected.
Audio Level Measured in:
Repeated presses of the adjacent soft key will toggle through Volts, dBm, dBV or Watts and
highlight the selection in inverse video.
The level of a signal applied to the AF input socket is measured in terms of the selected option.
This will then apply to all subsequent measurements.
The indicated output level from the AF generators is not affected by this selection.
Audio Input Impedance:
This key is only active if the 600 Ω interface option is fitted. Pressing it will toggle between the
600 Ω balanced input impedance or the standard high impedance. The AF input connector on
the front panel is used in either case.
Audio Output Impedance:
This key is also only active if the 600 Ω interface option is fitted. Pressing it will toggle between
the 600 Ω balanced output impedance or the standard low impedance. The AF generator output
connector on the front panel is used in either case.
20 dB audio attenuator:
This key is also only active if the 600 Ω interface option is fitted. Repeated presses of it will
insert or remove a 20 dB attenuator from the output circuit of the audio amplifiers. With the
attenuator in circuit the maximum output is limited to 400 mV. The adjustment resolution is
increased to 0.01 mV below 40 mV and to 0.1 mV from 40 mV to 400 mV.
GPIB Address
Pressing the [GPIB Addr] key allows a new GPIB address to be entered by using the data input
keys to enter the digits, followed by the ENTER terminator key. It may have a value between 1
and 30.
Remote Control
The Service Monitor can be operated by remote control using either the RS232 (serial) port or the
optional GPIB (IEEE 488) interface. The [Remote Control] key toggles between the two options
The active function is highlighted in inverse video.
Serial Setup
The[Serial Setup] key gives access to the serial port setup menu. The parameters that must be set
for compatibility with other equipment connected to the port are:-
Baud Rate; Parity Bit; Character Length; Stop Bit; and Handshaking.
Setting up of the serial port is described in the Chapter 4 of the Programming manual
(46882-318B) under Preparing the Service Monitor for remote operation .
Printer Setup
A menu of printer type options and printer port selection is accessed through this key. The
options are:-
Epson FX80 or FX100.
Laser Printer 75 dpi, 100 dpi, 150 dpi.
RS232 serial port or ‘Centronics’ parallel port. The selected port is highlighted in inverse video.
If the parallel port option is not fitted, it is not shown on the menu, and the [Printer Port] key
enables or disables the RS232 serial port as a printer port.
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