ORMELABS MW1008P, Руководство пользователя

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MW1008P, user manual
8
KEYPAD
The keypad is used to select
measurement conditions and to
enter values. All keys have two
functions,
depending on
whether the key is pressed
momentarily or for two seconds
or longer.
L/C/R
This key selects the parameter being measured. Pressing the
L/C/R
key steps through the
major parameters to manually select the desired ([L+Q] or [L+A
L
], [C+D], [R+Q], [|Z|+

],
[R+X], [G+B]). When this key is pressed for more than two seconds the instrument goes in
Auto Parameter mode. In this mode, the instrument will select the most appropriate parameter
pair according to the phase angle and the absolute impedance. This mode is indicated by the
presence of a dark arrow at the top left of the display. The different modes are described
below. The [L+A
L
] mode replaces the [L+Q] mode when the instrument is configured in A
L
mode (see
MENU
key ).
n/Vs/M
This key selects the transformer measurement mode. Pressing this key steps through and
permits the selection of the desired function ( [N+

], [1/N+

], [Vs+Vp], [M+

] ).
[N+

] Turns ratio and phase angle
[1/N+

] Reciprocal turns ratio and phase angle
[Vs+Vp] Secondary and Primary Voltage
[M+

] Mutual Inductance and phase angle
Frequ.
The
Freq
.
key selects one of the following test frequencies: 100 Hz, 120 Hz, 250 Hz, 500
Hz, 1 kHz, 2.5 kHz, 5 kHz, 7.8125 kHz, 12.5 kHz, 15.625 kHz and 25 kHz. The selected
frequency is indicated just above this key. When the user frequency is selected the word
USER is displayed. Pressing this key for longer than two seconds sets the LCR meter to use
the default parameters. The default frequency is 1KHz.
Hold/Range
The
Hold
/
Range
key selects the impedance range of measurement appropriate for the device under test.
Pressing this key holds the unit in its current measurement range. Repeated pressing of this key changes the
measurement impedance range (1 – 6). Pressing this key for longer than two seconds returns the unit to auto-
ranging or normal mode. The range is displayed in the top right corner of the display. The ‘A’ character behind
the Range number
indicates that the instrument is in Auto Range mode. In Manual or Hold ranging mode, this
letter becomes a blinking “H” character. Pressing this key for two seconds or longer returns to
the Auto mode. See also chapter “Impedance ranges” page 24 for more details about
impedance ranges.