Chapter 7 Installation
Preparation for Use
120 Operating and Programming Manual
Preparation for Use
This section describes:
• Power requirements, line voltage and fuse selection, and available ac-power
cables
• Operating environment
• Bench Operation
• Installing options 908 or 913
• How to return the instrument to Symmetricom.
Power Requirements
The 5071A can operate from ac power sources of 100-, 120-, 220-, or 240 volts
ac, 45 to 66 Hertz for all voltages, 400 (10%) Hertz for 100-, and 120-volts AC.
Maximum ac-power consumption is 100W, 140VA.
Operating power may also be supplied as external dc voltages between 22 and 42
VDC. Maximum dc-power consumption is 85 W. Refer to Chapter 6,
―Specifications,‖ for more details, and the section in this chapter that explains
auxiliary dc-power operation.
For 48 VDC option, the external dc voltages between 40 and 58 VDC is required.
Maximum dc-power consumption is 100 W.
THIS IS A SAFETY CLASS I PRODUCT PROVIDED WITH A
PROTECTIVE EARTH TERMINAL. AN UNINTERRUPTIBLE
SAFETY EARTH GROUND MUST BE PROVIDED FROM THE
MAINS POWER SOURCE TO THE PRODUCT INPUT WIRING
TERMINALS, POWER CORD, OR SUPPLIED POWER-CORD
SET. WHENEVER IT IS LIKELY THAT THE PROTECTION
HAS BEEN IMPAIRED, THE INSTRUMENT MUST BE MADE
INOPERATIVE AND BE SECURED AGAINST ANY
UNINTENDED OPERATION.
IF THIS INSTRUMENT IS TO BE ENERGIZED VIA AN
EXTERNAL AUTOTRANSFORMER FOR VOLTAGE
REDUCTION, MAKE SURE THAT THE COMMON TERMINAL
IS CONNECTED TO THE EARTHED POLE OF THE POWER
SOURCE. FAILURE TO GROUND THE INSTRUMENT CAN
RESULT IN PERSONAL INJURY. REFER TO THE
PARAGRAPH TITLED “AC POWER CABLING”.
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