Reference Section • 115
Chapter 5
Power Supply
• Behavior and maintenance of the power supply used in the MultiClamp 700A.
• See also Grounding and Hum.
Supply Voltage Selection
The MultiClamp 700A can be directly connected to all international supply voltages.
The input range is from 85 to 260 V
AC
. No range switching is required. Alternatively,
a DC voltage of 110 – 340 V
DC
can power the instrument.
Changing the Fuse
The MultiClamp 700A uses a 0.5 A, 250 V slow acting 5 x 20 mm fuse. Before
changing the fuse investigate the reason for its failure. To change the fuse:
1. Disconnect the power cord.
2. Use a screwdriver or a similar device to rotate the fuse holder counterclockwise.
3. Replace the fuse with another fuse of the same rating.
4. Reconnect the power cord.
Glitches
The MultiClamp 700A has been designed to minimize the effects of power-supply
transients (glitches). Although normally inconsequential, glitches could cause
transients to appear on the voltage and current outputs that may corrupt high-
sensitivity recordings.
The most effective way to gain immunity from mains glitches is to eliminate them at
the source. Most glitches are due to the on/off switching of other equipment and lights
on the same power-supply circuit. Precautions to be taken include:
1. Avoid switching equipment and lights on or off while recordings are being made.
2. Water baths, heaters, coolers, etc. should operate from zero-crossing relays.
3. Radio Frequency Interference
filters should be installed in glitch-producing
equipment.
To Next Page
Loading...
Need help?
General
