Model TT235-0600
RTD/Resistance Thermometer Transmitter w/USB
Acromag, Inc. Tel: 248-295-0880
- 33 -
http://www.acromag.com
[
33
]
https://www.acromag.com
Output
…
Output Ripple/Noise:
Less than
0.1% of output span.
Note (High Speed Acquisition): Additional filtering at the load is recommended for
sensitive applications with high-speed acquisition rates. High frequency noise is often
reduced or eliminated by placing a 0.1uF capacitor directly across the load. For
excessive 60Hz supply ripple with current output, a 1uF or larger bulk capacitor is
recommended at the load.
USB Interface
IMPORTANT:
The input of this transmitter is
isolated from its output and
can be connected to grounded
or un-grounded input sensors.
However, the transmitter’s
input circuit ground is
connected in common to the
USB power/signal/shield
ground. This will in-turn make
a connection to earth ground
at the PC when directly
connected to the USB port of a
PC without using an isolator.
Failure to connect USB
without isolation would
connect the 1.25V input bias
supply to input ground if the
sensor is also earth grounded.
This will interfere with
operation and cause the
output to shift. For this
reason, USB isolation is
strongly recommended when
connecting to a PC. Otherwise,
in the absence of USB
isolation, and when connected
to a grounded input sensor, a
battery powered laptop could
be used to connect to the
transmitter, as the laptop does
not normally connect to earth
ground.
Transmitter includes a USB socket for temporary connection to a PC or laptop for the
purpose of setup and reconfiguration. USB isolation is required when connected to a
grounded input sensor (see “IMPORTANT” note
on the left). During reconfiguration
and calibration, the transmitter receives power from both the USB port and the
output loop. Both power sources must be present to calibrate the transmitter.
CAUTION:
Do not attempt to connect USB in a hazardous environment. Transmitter
should be configured and calibrated in a safe environment only.
Data Rate:
USB v1.1 full-speed only, at 12Mbps. Up to 32K commands per second.
USB 2.0 compatible.
Transient Protection:
Transient voltage suppression on USB power and data lines.
Inrush Current Limiting:
Includes series inrush current limiting at USB power.
USB Connector:
5-pin, Mini USB B-type socket, Hirose Electric UX60-MB-5S8.
Pin
Definition
1
+5V Power
2
Differential Data (+)
3
Differential Data (-)
4
NC
–
Not Connected
5
1
Power Ground (Connects to Signal Ground via ferrite bead)
SHLD
1
Signal Ground (Connects directly to Signal Ground)
1
Note:
Most Host Personal Computers (except battery powered laptops) will connect
earth ground to the USB shield and signal ground.
Cable Length/Connection Distance:
5.0 meters maximum.
Driver:
No special drivers required. Uses the built-in USB Human Interface Device
(HID) drivers of the Windows Operating System (Windows XP or later versions only).
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