Measurement Computing WBK Options - Manual (Page 119)

TEDS Support
TEDS, Transducer Electronic Data Sheet, is a purchased option. The TEDS feature enables a WBK18 module to
access the calibration information that is stored within TEDS-compatible sensors. The WBK18 can read calibration
information from sensors and automatically scale the readings from each sensor, using the acquired calibration
information. TEDS support is a software option that can easily be added after the initial purchase of the WBK18.
Reference Note:
Information regarding
TEDS in relation to the WaveView software application begins on page 8.
Excitation Source
The WBK18’s AC excitation source is a sine wave-based voltage source that is programmable in frequency from
1 Hz to 5 kHz and in discrete amplitudes from 100 mVp-p to 10 Vp-p. Continuous sine, sweep sine, and custom
sine modes are available. It can be used as a test source for the input channels or as excitation for other system
elements, such as the amplifier for a shaker table. All of its parameters are software controlled, and its output is
conveniently provided on a front panel BNC connection. Detailed information on the excitation source and its
operation can be found in the Software Setup section.
Do not confuse excitation source with the Source Level column in WaveView’s main window, as source level refers
to transducer bias current (see
Source Level , page 8) and not to the excitation source.
LEDs
The right-hand side of the WBK18 front panel includes 19 indicator LEDs. There are eight Transducer Fault LEDs
(1 for each channel), eight Overrange LEDs (1 for each channel), an Active LED, Ready LED and a Power LED.
The indicators have the following meanings.
Transducer Fault
(1 LED per Channel)
When lit, a Transducer Fault LED indicates that the transducer for the associated channel has
either an open circuit or a short circuit. In addition to LED indication, transducer fault
information is available through a software status request at the end of an acquisition.
Transducer fault errors are latched until the commencement of a new acquisition.
Consequently, even intermittent faults are detected and communicated. Detection of a
transducer fault does not stop an acquisition or alter data. For related information refer to
Current Source with Transducer Fault Detection on page 2.
Overrange
(1 LED per Channel)
When lit, an Overrange LED indicates that the associated channel’s input signal has exceeded
the input full-scale range, which was programmed for that specific WBK18 module. Even a
momentary exceeding of the range will cause the LED to light. This indication is critical, for
overrange signals result in clipped data that significantly corrupts FFT analysis. In addition
to LED indication, the overrange condition is available through a software status request at
the end of an acquisition. Overrange errors are latched until the commencement of a new
acquisition. Consequently, even intermittent faults are detected and communicated.
Overrange events do not stop an acquisition or alter data. For related information refer to
Overrange Detection on page 3.
Active Lights when data is being converted.
Ready Lights when the WBK18 has established communication via its Expansion Control In
connector.
Power Lights when power to the unit is turned on and present.
WBK18, pg. 4 926896 WBK18, Dynamic Signal Input Module