1. Connect cables only with the AC power off.
2. Temporarily “short” the end of the cable before
attaching it to any signal input or output.
Additionally, internal adjustments should be done ONLY in an
ESD-safe work area. Even ESD-protected electronics can be
vulnerable to extremely high voltage.
Equipment Ratings
This equipment operates at 104°F (40°C), in an environment
having 93% relative humidity. Its frequency range is 50/60 Hz.
Operation of this unit is limited to environments having an
altitude of less than 2000 meters. The pollution degree for
operation of the Model 440 is two (2), meaning that normally,
only non-conductive pollution occurs.
The over voltage category is 11, indicating the transient
voltage levels that may be tolerated by the equipment.
For complete specifications, refer to the enclosed
specification sheet.
Grounding
Indiscriminate grounding of instruments can introduce
ground loop interference. To prevent this, it is necessary to
insure that the signal ground line of the 444A151 and of other
instruments with which it is used are grounded at one point
only in the measurement system.
Connect the signal ground lines of all the instruments
together. This is done through the shields of the input and the
output cables used to interconnect the instruments.
If an instrument with a mains chassis ground is used, check
that only one of the instruments has its signal ground
connected via the chassis to mains ground, and that the
housing of the transducer is isolated from grounded
measurement sources.
Equipment Overview
The Model 444A152 Peak Meter is designed for modular-style
signal conditioners 444A52 and 444A53. 444A52 combines
444A152, a dual-mode amplifier module (443B102), and an
AC power supply module (441A101) into one integrated
device. Model 444A52 eliminates the dual mode amplifier
module and is intended for direct connection to ICP® pressure
sensors, any direct voltage input, or for existing systems that
already utilize a separate charge amplifier.
Unlike a digitizing peak detector, which is limited in accuracy
by the sampling rate, the 444A152 peak monitoring module
captures the true peak voltage of the transient event.
Additionally, the module incorporates a 20 kHz low pass filter,
offers reset capability between events and delivers an analog
output signal to profile the entire pressure event.
This device is ideal for barrel chamber pressure testing, lot
testing of ammunition and cartridge load studies. It was
designed expressly for use with piezoelectric transducer
systems to measure peak shock, pressure, arid impact
phenomena—although its use is not limited to these
applications.
The unit has selectable gains of 1, 10, and 100. A polarity
option is also included which allows measurements of
positive as well as negative gain pulses. The unit can be
configured to accept ICP or voltage mode inputs.
Other than peak hold mode, the unit is capable of DVM mode
(RMS, PEAK, aind TRUE OUTPUTJ
and is capable of measuring the BIAS of ICP transducers.
Refer to the Block Diagram, Figure 2, located in Appendix B.
Components and Features
The Model 444A151 Peak Meter has a total of 6 operational
modes. They are as follows:
• PEAK hold with manual reset.
• PEAK hold with timed reset.
• DVM RMS mode
• DVM PEAK mode
• BIAS mode
• TRUE OUTPUT mode
Overload indications are provided for the input, the output of
each of the gain sections, and the input of the peak detector.
Fault indication is provided for the input when operating in
ICP® mode. This indicates an open or short to the transducer.
Two alarms are available to monitor the peak, DVM, or true
output voltages. This provides for the ability to set two
separate threshold levels. If the alarm(s) are triggered,
relay(s) are actuated and status LED(s) are illuminated.
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