Memoq MR-720 Bedienungsanleitung PDF herunterladen (Seite 5)

SR715/720 LCR METER

iii

SAFETY AND PREPARATION FOR USE

WARNING

Dangerous voltages, capable of causing injury or death, are present in this instrument. Use extreme caution

whenever the instrument cover is removed. Do not remove the cover while the unit is plugged into a live

outlet.

CAUTION

This instrument may be damaged if operated with

the LINE VOLTAGE SELECTOR set for the wrong

AC line voltage or if the wrong fuse is installed.

LINE VOLTAGE SELECTION

The SR715/720 operates from a 100V, 120V,

220V, or 240V nominal AC power source having a

line frequency of 50 or 60 Hz. Before connecting

the power cord to a power source, verify that the

LINE VOLTAGE SELECTOR card, located in the

rear panel fuse holder, is set so that the correct

AC input voltage value is visible.

Conversion to other AC input voltages requires a

change in the fuse holder voltage card position

and fuse value. Disconnect the power cord, open

the fuse holder cover door and rotate the fuse-pull

lever to remove the fuse. Remove the small

printed circuit board and select the operating

voltage by orienting the printed circuit board so

that the desired voltage is visible when pushed

firmly into its slot. Rotate the fuse-pull lever back

into its normal position and insert the correct fuse

into the fuse holder.

LINE FUSE

Verify that the correct line fuse is installed before

connecting the line cord. For 100V/120V, use a

1/2 Amp fuse and for 220V/240V, use a 1/4 Amp

fuse.

LINE CORD

The SR715/720 has a detachable, three-wire

power cord for connection to the power source

and to a protective ground. The exposed metal

parts of the instrument are connected to the outlet

ground to protect against electrical shock. Always

use an outlet which has a properly connected

protective ground.

BIAS VOLTAGE ON CAPACITORS

Verify that polarized capacitors are installed with

the correct polarity before applying a bias voltage.

Failure to do so can result in damage to the unit,

the device under test, or possible injury. The

SR715/720 fixture and remote fixtures are marked

with '+' and '-' signs, or by red leads for the

positive connectors. Capacitors charged by an

external bias voltage should be discharged after

making the measurement. A 40 volt external bias

can charge a capacitor to a high enough voltage

that it can cause injury if it is accidentally

discharged. See the section on BIAS for more

information on how to safely apply external bias

voltage.

When connecting the external bias voltage to the

unit, observe the correct polarity and make certain

that the bias supply is floating (neither side is

connected to ground). Be certain to use a supply

current limited to 250 mA or less.

PROTECTION FUSES

In addition to the line fuse, the SR715/720 has two

other protection fuses. The external bias fuse

(3AG 0.25 A) is installed on the rear panel, next to

the bias terminals. If unstable readings occur

when making measurements with an external

bias, check this fuse. The other fuse is an output

protection fuse (2AG 0.25 A) located internally on

the main PCB. If unstable or erratic readings occur

or an 'outPut Err' (output err) occurs during self

test, this fuse may be damaged. See the

maintenance section for more information.

SERVICE

Do not attempt to service or adjust this instrument

unless another person, capable of providing first

aid or resuscitation, is present. Do not install

substitute parts or perform any unauthorized

modifications to this instrument. Contact the

factory for instructions on how to return the

instrument for authorized service and adjustment.

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