Metrohm E1620, Инструкция по эксплуатации

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2. GENERAL DESCRIPTION
The E1620 digital milli–ohmmeter is a hand–held, high current
instrument with which stable, accurate measurements of
resistance can be made over a wide range of values. Resolution
on the lowest range is 10µ
Ω
and the highest range has a maximum
value of 20
Ω
. Measurements are displayed on a 3½ digit, custom
liquid crystal display with large digits. This instrument
incorporates a high efficiency converter which allows it to be
powered by either manganese alkali cells or rechargeable nickel–
cadmium cells. A hold function is incorporated in the display
circuit to assist in reducing the power consumption of this tester.
The instrument has two principle circuits; a high efficiency D.C.
converter and a digital D.C. milli–voltmeter. Employing feedback
techniques, the D.C. converter supplies a constant current to the
resistance being measured via the current terminals. Voltage drop
across this resistance is monitored by the milli–voltmeter via
the potential terminals. As the analogue to digital converter in
the milli–voltmeter utilises a ratiometric technique, the resistance
is measured precisely and is unaffected by variations of the test
current.
The E1620 has a custom, 3½ digit liquid crystal display with
18mm high digits which are readily viewed in most lighting
conditions. This display also indicates low battery voltage,
overrange and reverse polarity of load conditions. The decimal
point changes to correspond with the range selected. Two LED
indicators warn the operator that the test current is low or that
mains voltage is present on the input terminals.
Drop Test: IEC1010, Clause 8.4
Impact Test: IEC1010, Clause 8.2
Weight: 0.75kg (with batteries and leads)
6.3 Environmental
Operating Temperature
Range:
-15ºC to +55ºC
Storage Temperature
Range:
-20ºC to +65ºC
Humidity: 93% RH at +40ºC
Cold Temperature: IEC68-2-1
Dry Heat: IEC68–2–2
Damp Heat: IEC68–2–3
Drop Test: IEC1010, Clause 8.4
Impact Test: IEC1010, Clause 8.2
Weight: 0.75kg (with batteries and leads)
6.3 Environmental
Operating Temperature
Range:
-15ºC to +55ºC
Storage Temperature
Range:
-20ºC to +65ºC
Humidity: 93% RH at +40ºC
Cold Temperature: IEC68-2-1
Dry Heat: IEC68–2–2
Damp Heat: IEC68–2–3
2. GENERAL DESCRIPTION
The E1620 digital milli–ohmmeter is a hand–held, high current
instrument with which stable, accurate measurements of
resistance can be made over a wide range of values. Resolution
on the lowest range is 10µ
Ω
and the highest range has a maximum
value of 20
Ω
. Measurements are displayed on a 3½ digit, custom
liquid crystal display with large digits. This instrument
incorporates a high efficiency converter which allows it to be
powered by either manganese alkali cells or rechargeable nickel–
cadmium cells. A hold function is incorporated in the display
circuit to assist in reducing the power consumption of this tester.
The instrument has two principle circuits; a high efficiency D.C.
converter and a digital D.C. milli–voltmeter. Employing feedback
techniques, the D.C. converter supplies a constant current to the
resistance being measured via the current terminals. Voltage drop
across this resistance is monitored by the milli–voltmeter via
the potential terminals. As the analogue to digital converter in
the milli–voltmeter utilises a ratiometric technique, the resistance
is measured precisely and is unaffected by variations of the test
current.
The E1620 has a custom, 3½ digit liquid crystal display with
18mm high digits which are readily viewed in most lighting
conditions. This display also indicates low battery voltage,
overrange and reverse polarity of load conditions. The decimal
point changes to correspond with the range selected. Two LED
indicators warn the operator that the test current is low or that
mains voltage is present on the input terminals.
The ranges are selected by a four–position rotary switch, and
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