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Quad and Octal Bridge Amps
Signal Conditioners
Description
The ML118 Quad and ML119 Octal
Bridge Amps are optimized for use
with multiple chamber organ baths.
They provide a fast software or switch
initiated zeroing capability. Each input
consists of a software controlled nonisolated, low-noise bridge amplifier
suitable for use with full bridge strain
gauge type transducers.
Compatibility
The Quad and Octal Bridge Amps are compatible with all PowerLab and MacLab
systems and require Chart v4 or later or Scope v3.6 or later.
The following are some of the transducers suitable for use with the Quad and Octal
Bridge Amps:
MLT0380/D
MLT844
MLT1199
MLT0015
MLT0202
MLT0201
MLT0210/D
MLT500/D
MLT050/D
MLT003/D
Reusable BP Transducer
Physiological Pressure Transducer
Blood Pressure Transducer /Cable Kit
High Grade Isotonic Transducer
Sensitive Isometric Force Transducer (0-25 g)
Force Transducer (5 - 25 g)
Teaching Force Transducer
Force Transducer (0 - 500 g)
Force Transducer (0 - 50 g)
Hand Dynamometer
For transducers with Grass connectors, an MLAC18 Grass Adapter Cable is required
for use with ML118 or ML119 Bridge Amps.
Applications
Used for measuring force, displacement and physiological pressures. Ideal for multichannel isolated tissue studies.
Specifications
Input
Number of inputs:
4 (Quad) or 8 (Octal)
(8-pin DIN)
Input configuration:
Single-ended, with differential to single ended conversion
for 4-arm bridges.
Amplification range:
±20 µV to ±200 mV full scale in 13 steps
(combined PowerLab and Bridge Amp)
±200 mV
±100 mV
±50 mV
±20 mV
±10 mV
±5 mV
±2 mV
±1 mV
±500 µV
±200 µV
±100 µV
±50 µV
±20 µV
Amplification accuracy:
±0.25% (combined PowerLab & Bridge Amp; with 0 to
5 kΩ input source resistance)
Maximum input voltage:
±10 V, continuous
Input impedance:
Over 108 Ω for signals up to ±0.5 volts (1 kΩ above ±0.5
volts).
Low-pass filtering:
1 Hz to 100 Hz in seven steps (software selectable), using
fourth-order Bessel filters (for constant time-delay)
AC coupling:
Not provided
Input referred noise:
350 Ω resistor between input and ground to simulate
bridge, 50 µV range, over 5 sec
LP Setting
Noise
100 Hz 1.3 µVrms
50 Hz
1.1 µVrms
20 Hz
0.58 µVrms
10 Hz
0.36 µVrms
5 Hz
0.36 µVrms
Amplifier offset:
±0.2% f.s. ±10 µV (with no zeroing applied)
Amplifier drift:
<0.3 µV per °C at 1 mV range or lower
(with low-resistance input)
Excitation and Zeroing
Excitation voltage range:
DIN: 8 volts DC (±4 V referred to ground)
Excitation voltage accuracy: ±0.25%
Excitation current:
Limited to about 25 mA per transducer
Min. transducer impedance: 350 Ω
Max. transducer impedance: 2.50 kΩ recommended
Bridge configurations:
4-arm bridge standard, 2-arm requires fix with 2 matched
high-precision resistors
Offsetting capability:
±150 mV with 16-bit internal DAC giving c. 4.5 µV
offsetting resolution (fixed)
Zeroing circuitry:
Software-controlled, either manual or automatic; or using
external switches
Stabilization time:
15 seconds maximum (after power-up and before I2C
commands are accepted)
Auto-zeroing time:
1 second per channel re-zeroing (with stable input)
Status Indicators
Diagnostic lights:
Status indicators give information for each channel on
warm-up sequence, zeroing, and possible faults, such as
transducer overload
Control Port
I2C port:
Power and control bus for front-end units. Supports a
number of front-ends dependent on the PowerLab.
Interface communications rate of ~50 Kbits/s.
Physical Configuration
ML118 (Quad) (w × d × h):
300 mm × 300 mm × 60 mm
(11.8" × 11.8" × 2.4")
3.1 kg (6 lb 12 oz.)
Weight:
ML119 (Octal) (w × d × h):
300 mm × 300 mm × 60 mm
(11.8" × 11.8" × 2.4")
3.4 kg (7 lb 8 oz.)
Weight:
Power requirements:
1.8 W (with no transducers)
5.25 W (4 × 350 Ω transducers, 8V excitation)
10.5 W (8 × 350 Ω transducers, 8V excitation)
Operating temperature range:
5 to 40 °C, 0 to 90% relative humidity
(non-condensing)
ADInstruments reserves the right to alter these specifications at any time
Front and Back Panels
ADINSTRUMENTS
Quad Bridge Amp
1
Status
Quad Bridge Amp
Octal Bridge Amp
2
Zero
Status
3
Zero
Status
4
Zero
Status
Zero
WARRANTY: ADInstruments PowerLab Systems, Front-end and Pod Signal Conditioners are warranted against defects
in materials and workmanship for a period of 3 years from the date of purchase. Third party products are covered by the
manufacturer’s warranty. Warranties are void if the product has been damaged due to negligence. Consumables and
electrodes are not covered by a warranty. All questions regarding service and warranty should be directed to your nearest
ADInstruments representative or one of the offices listed below.
Caution
Read “Statement of Intended Use” on our website or in “Getting Started with PowerLab” before use.
Ordering Information
ML118 Quad Bridge Amp
ML119 Octal Bridge Amp
ML118 Includes:
I2C Cable (9-pin plug to 9-pin receptacle)
BNC to BNC Cables (4)
DIN Connector Kits (4)
Bridge Amp Owner’s Guide
ML119 Includes:
I2C Cable (9-pin plug to 9-pin receptacle)
BNC to BNC Cables (8)
DIN Connector Kits (8)
Bridge Amp Owner’s Guide
A MLAC18 Grass Adapter Cable may be ordered as an optional extra.
ML118_119-DC-05A
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