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8. Long TC may be selected in ICP® mode, so that
the amplifier is DC coupled. When long TC is
selected, the LCD will display:
Adjust DC Offset
X.XXXX V
The up and down keys may then be used to
adjust the offset so that the sensor bias is
removed from the signal.
Zeroing the Output in Long Time Constant
Mode (443B102 only)
1. To zero the output after making a long time
constant measurement, simply push the ZERO
key. Alternatively, a two-conductor cable with an
SMB connector may be plugged into the EXT
ZERO receptacle on the front panel. When the
center conductor is shorted to the shell, the ZERO
will be actuated.
2. ZERO may be locked in long time constant mode
by holding down the ZERO key for several
seconds. The display will then read:
ZERO LOCKED ON
Push ZERO to Res
This will hold the output at about zero volts,
regardless of the charge input.
recommended to lock the zero on when
connecting or disconnecting a sensor, or
whenever there is a possibility of overloading
the amplifier.
3. To release the zero lock, simply push the ZERO
key again.
Setting the Low Pass Filter
1.
Press the MENU button.
2.
Select LPF using the down and right arrow keys.
3.
Press the MENU button again. The 443B now
shows the following:
0.1k 1k 3k
10k 30k 100k
Using the up/down and right/left arrow keys,
select the desired low-pass frequency setting.
4. Press the MENU button a final time to verify the
correct LPF setting on the front panel.
Manual 19854 Rev. D
ECN 50523
It is
Off
TEDS Features
The 443B incorporates several features which allow
the use of sensors with TEDS electronics. The 443B
can read the raw data from any TEDS sensor, and is
able to locally decode the data from sensors using
IEEE 1451.4, UTID 1, and UTID 116225. Raw data in
hex form is also available via the RS-232 interface
which may then be decoded by the host computer.
The RS-232 commands are described in Appendix A.
The easiest way to take advantage of TEDS sensors is
the use the auto normalization feature. This feature
automatically reads the data in a TEDS sensor when
it is connected to the 443B and sets the sensitivity to
the value stored in the sensor. Thus the user is
spared the inconvenience (and potential error) of
locating the sensor's data sheet and manually
entering this information.
feature is normally disabled, but may be enabled if
desired by selecting TEDS from the main menu and
then selecting OFF when the Auto TEDS Read menu
is displayed.
The Auto Teds feature can cause erratic
output when used with certain sensors.
To avoid this possibility, Auto TEDS
should be disabled for sensors that have
time constants of 1 second or longer, or
sensors with high sensitivities (1 V/g and
up) .
The remainder of the TEDS data may be viewed by
selecting TEDS from the main menu, and continuing
through the Auto TEDS Read On/Off menu. The next
display will read:
SELECT UNITS
SI
ENGLISH
This selection determines whether the TEDS data is
displayed in SI or English units. Once this selection
has been made, all stored data may be viewed by
pushing the down key to scroll through it.
Velocity Measurement
1.
Press MENU button. The main menu appears on
the display:
443B101/443B102
5
The auto-normalize
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