Description of the instruments
6,000- and 60,000-count digital multimeters
15
Description of the instruments (continued)
Keypad
The keypad has the following function keys:
The keys are taken into account and applied when pressed. If the key press is
validated, the instrument beeps.
Two types of action are possible:
•
Short
press
Æ
press lasting <2 seconds, validated by a beep as
soon as the key press is detected.
•
Long press
Æ
press lasting >2 seconds, validated by a beep as soon as
the key press is detected.
Function keys
Successive short presses
Long press
Activation/deactivation of storage of
the measurements and of the
quantities at a given time:
- Hold of the display without stopping
the acquisitions. The bargraph
continues to operate normally.
- Exit from the HOLD mode
In the MAX/MIN/AVG PEAK mode,
when the HOLD is active, the blinking
of the "MAX MIN AVG PEAK" symbol
indicates that acquisition continues as
a background task.
- Hold of the display after
stabilization of the
measurement (Auto
HOLD)
- Exit from the
Auto HOLD mode
Choice of coupling
AC, DC, AC+DC
:
- Access to various parameters
Æ
In dBm: change of impedance 50
Ω
,
75
Ω
, 90
Ω
, 600
Ω
(
MTX 3291
only)
Æ
In temperature: the main display
unit indicates the temperature in °C,
the other in °F
Æ
In the
∆
REL mode, the key is used
to change from (present value –
reference value) to
Present value – reference value
Reference
value
The value is displayed in %.
(
MTX 3291
only)
Activation/deactivation of
auto power off (APO)
(
MTX 3291
only)
Activation/deactivation of the low-pass
filter
≈
300Hz:
The low-pass filter (4th order) makes
it possible to measure the RMS
voltage delivered by an MLI type
speed controller (for asynchronous
motor).
See
curve
, p. 49 and 60.
Activation/deactivation of
the key-press beep
MTX 3290
MTX 3291
x100
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